{"id":7822,"date":"2026-06-15T10:00:00","date_gmt":"2026-06-15T02:00:00","guid":{"rendered":"https:\/\/maxtormetal.com\/?p=7822"},"modified":"2026-06-15T13:13:32","modified_gmt":"2026-06-15T05:13:32","slug":"central-bore-tolerance-slitter-knives","status":"publish","type":"post","link":"https:\/\/maxtormetal.com\/it\/central-bore-tolerance-slitter-knives\/","title":{"rendered":"Tolleranza del foro centrale e runout: ottimizzazione degli accoppiamenti ISO 286 per mitigare le vibrazioni delle slitter ad alta velocit\u00e0."},"content":{"rendered":"<div class=\"wp-block-image\"><figure class=\"aligncenter size-full is-resized\"><img loading=\"lazy\" decoding=\"async\" width=\"1000\" height=\"891\" src=\"https:\/\/maxtormetal.com\/wp-content\/uploads\/2024\/11\/Slitter-blade.jpg\" alt=\"Tolleranza del foro centrale e runout: ottimizzazione degli accoppiamenti ISO 286 per mitigare le vibrazioni delle slitter ad alta velocit\u00e0.\" class=\"wp-image-5544\" style=\"width:614px;height:auto\" srcset=\"https:\/\/maxtormetal.com\/wp-content\/uploads\/2024\/11\/Slitter-blade.jpg 1000w, https:\/\/maxtormetal.com\/wp-content\/uploads\/2024\/11\/Slitter-blade-300x267.jpg 300w, https:\/\/maxtormetal.com\/wp-content\/uploads\/2024\/11\/Slitter-blade-768x684.jpg 768w, https:\/\/maxtormetal.com\/wp-content\/uploads\/2024\/11\/Slitter-blade-13x12.jpg 13w, https:\/\/maxtormetal.com\/wp-content\/uploads\/2024\/11\/Slitter-blade-600x535.jpg 600w\" sizes=\"(max-width: 1000px) 100vw, 1000px\" \/><\/figure><\/div><p>Il taglio (slitting) ad alta velocit\u00e0 \u00e8 spietato: se una lama circolare non gira perfettamente in asse, la qualit\u00e0 del bordo di taglio degrada prima ancora che la lama sia \"spuntata\". In questo articolo, Maxtor Metal collega la tolleranza e il runout del foro centrale (come la dimensione e la geometria del foro influiscono sul TIR del bordo durante la rotazione) ai valori che potete specificare e ai controlli che potete ripetere.<\/p><p><strong>Engineering Note:<\/strong>&nbsp;For knife-level specifications, including axial runout standards and material grades, see&nbsp;<strong><em><a href=\"https:\/\/maxtormetal.com\/it\/prodotto\/lame-circolari\/\" target=\"_blank\" rel=\"noreferrer noopener\">Maxtor Metal\u2019s Precision Circular Slitter Knives<\/a>.<\/em><\/strong><\/p><ul><li>Why dynamic runout ruins edge quality and OEE on high-speed slitters: it creates uneven engagement, heat, burrs, and early edge failure\u2014plus extra setup time and scrap.<\/li>\n\n<li>How central bore tolerance runout control and fit choice drive stability at the cutting edge: the bore is the first locator; its size and geometry affect centering repeatability and how the stack behaves at speed.<\/li>\n\n<li>What readers will take away: numeric targets, fit selection, assembly checks: runout target bands, ISO 286 fit windows (50 mm example), and a verification routine that prevents drift over time.<\/li><\/ul><h2 class=\"wp-block-heading\" id=\"7ebe99fe-ec81-462f-8919-760850fc53f3\">Runout amplification<\/h2><h3 class=\"wp-block-heading\" id=\"fe6f2aae-b54f-4299-ba18-c57e8d516053\">Geometry to dynamics<\/h3><p>At rest, runout looks like a simple geometric error: the blade\u2019s cutting circle isn\u2019t perfectly concentric with the arbor axis. At speed, that error turns into a force problem.<\/p><p>A small eccentricity at the bore creates a larger effect at the edge because the cutting radius is the longest lever arm in the system. And because runout is a&nbsp;<strong>stack-up<\/strong>, the assembled Total Indicated Runout (TIR) reflects the combined effects of arbor TIR, bore\/OD coaxiality, spacer parallelism, shoulder squareness, and clamping faces\u2014classic tolerance stack-up behavior across multiple locating surfaces.<\/p><p>In other words,&nbsp;<strong>arbor bore fit runout stack-up<\/strong>&nbsp;is the normal failure mode: a few small contributors add up to one visible edge problem.<\/p><p>So what: if your runout \u201cmoves around\u201d between blade changes, it\u2019s usually not the blade OD. It\u2019s repeatability of location\u2014bore fit, faces, spacers, and the seating condition.<\/p><p>In multi-knife setups, stack repeatability also depends on how thickness variation accumulates across knives and spacers; for practical troubleshooting, see<strong><em>&nbsp;<a href=\"https:\/\/maxtormetal.com\/it\/slit-width-variation-troubleshooting-controlling-cumulative-thickness-tolerance-in-multi-knife-slitting\/\" target=\"_blank\" rel=\"noreferrer noopener\">controlling cumulative thickness tolerance in multi-knife slitting<\/a>.<\/em><\/strong><\/p><h3 class=\"wp-block-heading\" id=\"9dd42eb1-ee35-4e11-9f09-cac7d887d42c\">Thin disc flexibility<\/h3><p>Slitter knives are often thin relative to diameter. That matters because clamping force and imperfect contact can elastically distort the disc.<\/p><p>Two common failure modes:<\/p><ul><li>You clamp hard to \u201cfix\u201d runout and you actually bend the blade or tilt it on a high spot.<\/li>\n\n<li>A slight face error (burr, dent, trapped debris) creates a tilt that becomes measurable edge TIR, even if the bore size is correct.<\/li><\/ul><p>If you want to go deeper on how face wobble shows up on the slit edge, see our guide to&nbsp;<em><strong><a href=\"https:\/\/maxtormetal.com\/it\/axial-runout-slitting-edge-quality\/\" target=\"_blank\" rel=\"noreferrer noopener\">axial runout and edge quality in slitting<\/a>.<\/strong><\/em><\/p><p>So what: a tighter bore size tolerance won\u2019t save a stack that isn\u2019t flat, clean, and square. Bore control is necessary, but it\u2019s not sufficient.<\/p><h3 class=\"wp-block-heading\" id=\"affcfbe0-0e63-44ed-815d-482fdbf86844\">Balance and resonance<\/h3><p>Runout and balance aren\u2019t the same thing. Runout is geometric\/assembly alignment; balance is mass distribution. You can have low TIR and still excite vibration if the assembly is unbalanced.<\/p><p>For high-speed slitting, practical guidance often starts with a precision arbor and low runout targets.<\/p><p>In many production environments, teams use an internal \u201cdo\u2011not\u2011exceed\u201d gate for assembled runout based on product tolerance and line speed. If your assembled edge TIR drifts into the&nbsp;<strong>0.02\u20130.04 mm<\/strong>&nbsp;range, it\u2019s typically a strong signal to investigate the full stack (arbor, faces, spacers, seating, and clamp conditions) rather than trying to compensate with overlap or side load alone.<\/p><p>If overlap and side clearance are part of your stabilization strategy, you may also find this companion article useful:&nbsp;<em><strong><a href=\"https:\/\/maxtormetal.com\/it\/slitter-overlap-depth-clearance-coptimization\/\" target=\"_blank\" rel=\"noreferrer noopener\">optimizing overlap depth a<\/a><a href=\"https:\/\/maxtormetal.com\/it\/slitter-overlap-clearance-optimization\/\" target=\"_blank\" rel=\"noreferrer noopener\">nd side clearance for stable slitting<\/a>.<\/strong><\/em><\/p><p>If you\u2019re fighting chatter that appears only above a certain line speed, treat it like a system problem: runout + balance + stiffness + damping can cross a resonance threshold.<\/p><p>So what: set two acceptance gates\u2014(1) assembled edge TIR and (2) vibration\/balance at speed.<\/p><h2 class=\"wp-block-heading\" id=\"50ad644e-30c1-45ad-93ee-1f7bf0c9e0dc\">Fit selection for central bore tolerance runout (ISO 286)<\/h2><div class=\"wp-block-image\"><figure class=\"aligncenter size-full is-resized\"><img loading=\"lazy\" decoding=\"async\" width=\"1000\" height=\"1000\" src=\"https:\/\/maxtormetal.com\/wp-content\/uploads\/2024\/11\/Circular-knives.jpg\" alt=\"Fit selection for central bore tolerance runout (ISO 286)\" class=\"wp-image-5540\" style=\"width:518px;height:auto\" srcset=\"https:\/\/maxtormetal.com\/wp-content\/uploads\/2024\/11\/Circular-knives.jpg 1000w, https:\/\/maxtormetal.com\/wp-content\/uploads\/2024\/11\/Circular-knives-300x300.jpg 300w, https:\/\/maxtormetal.com\/wp-content\/uploads\/2024\/11\/Circular-knives-150x150.jpg 150w, https:\/\/maxtormetal.com\/wp-content\/uploads\/2024\/11\/Circular-knives-768x768.jpg 768w, https:\/\/maxtormetal.com\/wp-content\/uploads\/2024\/11\/Circular-knives-12x12.jpg 12w, https:\/\/maxtormetal.com\/wp-content\/uploads\/2024\/11\/Circular-knives-600x600.jpg 600w, https:\/\/maxtormetal.com\/wp-content\/uploads\/2024\/11\/Circular-knives-100x100.jpg 100w\" sizes=\"(max-width: 1000px) 100vw, 1000px\" \/><\/figure><\/div><p>For readers specifying knife geometry alongside runout targets, bevel design can change how sensitive the cut is to small alignment errors; see&nbsp;<a href=\"https:\/\/maxtormetal.com\/it\/bevels-circular-slitter-knives-single-double-compound\/\" target=\"_blank\" rel=\"noreferrer noopener\"><strong><em>bevels for circular slitter knives<\/em><\/strong><\/a>&nbsp;for a practical overview.<\/p><p>If you\u2019re searching for&nbsp;<strong>ISO 286 H7 h6 g6 k6 p6 fit selection<\/strong>, treat it as a practical question: \u201cWhich fit window gives repeatable centering&nbsp;<em>without<\/em>&nbsp;assembly pain or distortion for my line speed and tolerance?\u201d<\/p><h3 class=\"wp-block-heading\" id=\"707f99fd-f26e-403f-b26c-9be86b9fbef4\">Central bore tolerance windows at 50 mm<\/h3><p>Fit language matters because it translates into a predictable clearance\/interference window.<\/p><p>For a 50 mm nominal example, published fit tables show H7 as a hole\u2011basis tolerance and several typical shaft zones as examples.<\/p><p>Because the ISO system is defined in paid standards, use the&nbsp;<em>official catalog pages<\/em>&nbsp;below for the authoritative scope and edition details:<\/p><ul><li>ISO 286\u20111:&nbsp;<em>ISO code system for tolerances on linear sizes \u2014 Part 1: Basis of tolerances, deviations and fits<\/em>&nbsp;(official catalog page):&nbsp;<a href=\"https:\/\/www.iso.org\/standard\/52912.html\" target=\"_blank\" rel=\"noreferrer noopener\"><em><strong>https:\/\/www.iso.org\/standard\/52912.html<\/strong><\/em><\/a><\/li>\n\n<li>ISO 286\u20112:&nbsp;<em>ISO code system for tolerances on linear sizes \u2014 Part 2: Tables of standard tolerance grades and limit deviations for holes and shafts<\/em>&nbsp;(official catalog page):&nbsp;<a href=\"https:\/\/www.iso.org\/standard\/52913.html\" target=\"_blank\" rel=\"noreferrer noopener\"><strong><em>https:\/\/www.iso.org\/standard\/52913.html<\/em><\/strong><\/a><\/li><\/ul><p>Use any numeric values you apply here as a practical starting point, but treat your own metrology, functional requirements, and the latest purchased edition of the standard as final\u2014especially if you\u2019re controlling edge TIR in the 10\u201320 \u00b5m range.<\/p><h3 class=\"wp-block-heading\" id=\"fc22ecbb-9197-498d-99c8-e518b99bf4b9\">Choosing H7\/h6, H7\/g6, H7\/k6, H7\/p6<\/h3><p>Below is the core decision logic for a 50 mm class bore\/shaft interface on a slitter knife (hole basis H7; shaft tolerance class \u00b76). The goal is predictable centering without distortion or unstable micro-slip.<\/p><ul><li>H7\/h6 (very close running \/ near line-to-line)<ul><li>Use when you want&nbsp;<strong>high centering repeatability<\/strong>&nbsp;with straightforward assembly.<\/li>\n\n<li>Risk to manage: fretting or pickup if surfaces are rough or contaminated.<\/li><\/ul><\/li>\n\n<li>H7\/g6 (clearance fit)<ul><li>Use when you need&nbsp;<strong>reliable assembly and controlled free fit<\/strong>, especially with frequent changes.<\/li>\n\n<li>Risk to manage: too much clearance can increase positional variability unless faces\/pilots control location.<\/li><\/ul><\/li>\n\n<li>H7\/k6 (transition fit)<ul><li>Use when you need&nbsp;<strong>more location security<\/strong>&nbsp;than g6 but don\u2019t want a true press fit.<\/li>\n\n<li>Risk to manage: the same parts can assemble as \u201ceasy\u201d one day and \u201ctight\u201d the next; clamp distortion can also increase.<\/li><\/ul><\/li>\n\n<li>H7\/p6 (interference \/ press fit)<ul><li>Use only when the design intent is a&nbsp;<strong>press-mounted component<\/strong>, not a blade that must be swapped routinely.<\/li>\n\n<li>If you need press\u2011fit limits for your nominal size, calculate them using your purchased ISO 286 tables (or your company\u2019s controlled fit calculator derived from the standard) to ensure the edition and rounding rules match your print requirements.<\/li><\/ul><\/li><\/ul><p>A practical way to connect fit choice to cutting performance is to treat fit selection as a&nbsp;<strong>risk control<\/strong>&nbsp;for assembled edge TIR. If your process needs&nbsp;<strong>\u226410 \u00b5m edge TIR<\/strong>, you typically can\u2019t rely on \u201cclearance somewhere in the stack\u201d to self-center.<\/p><div class=\"wp-block-image\"><figure class=\"aligncenter\"><img decoding=\"async\" src=\"https:\/\/statics.myquickcreator.com\/upload\/aaajozzbextvhz67\/2026\/05\/20\/image_1779284474-e41av2ap.jpeg\" alt=\"Infographic chart mapping 50 mm H7 fit windows to runout target bands and risk zones\"\/><\/figure><\/div><h3 class=\"wp-block-heading\" id=\"3c0b11a0-7fcc-47b7-ae8d-e4a7f2bbf2ef\">GD&amp;T and surface finish targets<\/h3><p>Size limits alone don\u2019t guarantee low runout. To stop runout at the edge, you also need geometric control.<\/p><p>Targets to specify (typical, adjust to your product tolerance):<\/p><ul><li>Bore to OD (cutting circle) runout \/ coaxiality: control as a runout requirement to the bore datum; this is often more practical than trying to verify true concentricity in production metrology. For authoritative definitions and symbol rules, refer to standards catalog pages such as:<ul><li>ISO 1101:2017 \u2014&nbsp;<em>GPS \u2014 Geometrical tolerancing \u2014 Tolerances of form, orientation, location and run-out<\/em>&nbsp;(official catalog page):&nbsp;<a href=\"https:\/\/www.iso.org\/standard\/66777.html\" target=\"_blank\" rel=\"noreferrer noopener\"><em><strong>https:\/\/www.iso.org\/standard\/66777.html<\/strong><\/em><\/a><\/li>\n\n<li>ASME Y14.5 (GD&amp;T) \u2014&nbsp;<em>Dimensioning and Tolerancing<\/em>&nbsp;(official ASME catalog listing PDF):&nbsp;<a href=\"https:\/\/files.asme.org\/Catalog\/Codes\/PrintBook\/35976.pdf\" target=\"_blank\" rel=\"noreferrer noopener\"><strong><em>https:\/\/files.asme.org\/Catalog\/Codes\/PrintBook\/35976.pdf<\/em><\/strong><\/a><\/li><\/ul><\/li>\n\n<li>Clamping faces parallelism \/ flatness: keep faces flat and parallel so clamping doesn\u2019t tilt the disc.<\/li>\n\n<li>Surface finish at the bore and clamping faces: smoother seating surfaces reduce high-spot tilt and improve repeatability.<\/li><\/ul><blockquote class=\"wp-block-quote is-layout-flow wp-block-quote-is-layout-flow\"><p><strong>Conclusione chiave<\/strong>: A \u201ccorrect\u201d ISO fit can still produce bad edge runout if bore geometry, faces, and stack flatness aren\u2019t controlled to the same order of magnitude as your edge TIR target.<\/p><\/blockquote><h2 class=\"wp-block-heading\" id=\"20525959-ac2f-4a1b-9914-0b4690f5027a\">Assembly and verification<\/h2><h3 class=\"wp-block-heading\" id=\"78ba4d77-f50e-42e9-b5cd-61175ea0f252\">Quick acceptance spec (targets + what to measure)<\/h3><figure class=\"wp-block-table\"><table><tbody><tr><th>What to control<\/th><th>Practical target band<\/th><th>Where to indicate (minimum)<\/th><th>If you\u2019re out of spec, check first<\/th><\/tr><tr><td>Assembled edge TIR (near cutting edge)<\/td><td>\u226410 \u00b5m (high\u2011precision) \/ 10\u201330 \u00b5m (general)<\/td><td>Near cutting edge on the assembled stack<\/td><td>Seating cleanliness, spacer damage\/parallelism, clamp face high spots, torque sequence<\/td><\/tr><tr><td>Arbor TIR<\/td><td>As low as practical (verify before blaming the knife)<\/td><td>Arbor OD \/ reference surface<\/td><td>Bent\/damaged arbor, bearing condition, shoulder squareness<\/td><\/tr><tr><td>Face wobble \/ axial runout<\/td><td>Keep to the same order as edge TIR<\/td><td>One knife face on the assembled stack<\/td><td>Burrs\/dents on faces, trapped debris, spacer flatness, clamp-face parallelism<\/td><\/tr><tr><td>Bore\u2011to\u2011OD runout (knife qualification)<\/td><td>Align with your edge\u2011TIR goal (often single\u2011digit \u00b5m for tight processes)<\/td><td>Indicate OD while locating from bore datum<\/td><td>Bore geometry, bore finish, datum setup, grinding sequence<\/td><\/tr><tr><td>Bore fit intent (ISO 286)<\/td><td>H7\/h6 when centering repeatability is critical; H7\/g6 when changeovers dominate<\/td><td>Fit is a design\/print requirement, not a measurement point<\/td><td>If runout \u201cmoves\u201d between changes, suspect clearance + seating repeatability, not OD<\/td><\/tr><\/tbody><\/table><\/figure><p>Use this table as a working baseline. Final limits should match your product tolerance, knife diameter\/thickness, line speed, holder stiffness, and your measurement resolution.<\/p><h3 class=\"wp-block-heading\" id=\"e40eb486-d1ac-4458-b332-085b56dddf37\">Boundary conditions and common pitfalls<\/h3><p>These recommendations are most reliable when the system is mechanically stable and your measurement method can resolve the targets.<\/p><p><strong>Boundary conditions (make them explicit in your spec):<\/strong><\/p><ul><li>Knife diameter vs. thickness: thinner discs are more sensitive to clamp-face errors and over-torque.<\/li>\n\n<li>Speed regime: higher line speed increases sensitivity to micro-slip, vibration, and resonance.<\/li>\n\n<li>Holder stiffness and loading: pneumatically loaded holders and worn pivots can amplify wobble.<\/li>\n\n<li>Process type: wrap shear slitting behaves differently from score slitting; don\u2019t copy overlap rules across processes.<\/li>\n\n<li>Measurement capability: if your indicator resolution and setup repeatability are worse than the tolerance you\u2019re chasing, you will \u201ctune noise.\u201d<\/li><\/ul><p><strong>Common pitfalls (and what to do instead):<\/strong><\/p><ol><li><strong>Only tightening bore size tolerance<\/strong>&nbsp;while ignoring faces\/spacers.<\/li><\/ol><ul><li>Do instead: control face flatness\/parallelism and spacer condition, then verify assembled edge TIR.<\/li><\/ul><ol start=\"2\"><li><strong>Using torque to force runout to disappear<\/strong>&nbsp;(bending the knife).<\/li><\/ol><ul><li>Do instead: find the seating high spot (burr\/dent\/debris), correct it, and use a consistent torque sequence.<\/li><\/ul><ol start=\"3\"><li><strong>Chasing overlap\/side load first<\/strong>&nbsp;when burr appears.<\/li><\/ol><ul><li>Do instead: measure arbor TIR and assembled edge TIR first; adjust overlap only after the stack is repeatable.<\/li><\/ul><ol start=\"4\"><li><strong>Measuring only OD TIR<\/strong>&nbsp;and assuming the edge is fine.<\/li><\/ol><ul><li>Do instead: indicate near the cutting edge and one face to catch wobble and tilt.<\/li><\/ul><ol start=\"5\"><li><strong>Skipping re-seat verification<\/strong>&nbsp;and accepting a one-time reading.<\/li><\/ol><ul><li>Do instead: re-seat once (clean \u2192 reassemble \u2192 remeasure). If TIR shifts materially, fix repeatability before changing knife geometry.<\/li><\/ul><h3 class=\"wp-block-heading\" id=\"5a4c5335-03a9-4cae-8294-f0cf4ba4f93b\">Arbor, spacers, cleanliness, torque<\/h3><p>If you want runout to stay low over weeks\u2014not just on a fresh setup\u2014treat assembly as a controlled process.<\/p><p>Checklist (field-practical):<\/p><ul><li>Verify arbor seat and shoulder are clean, burr-free, and undamaged.<\/li>\n\n<li>Clean blade bore and clamping faces; remove adhesive, oil film, and embedded particles.<\/li>\n\n<li>Inspect spacers for flatness\/parallelism; reject visibly dented or galled spacers.<\/li>\n\n<li>Use consistent torque and clamping sequence; avoid \u201cover-tightening to fix runout.\u201d<\/li>\n\n<li>Mark orientation for repeatability if you disassemble and reassemble frequently.<\/li><\/ul><h3 class=\"wp-block-heading\" id=\"9d9c8ebe-210d-4777-a521-fd97ba734165\">Measuring edge runout and concentricity<\/h3><p>For slitter knives, measurement method matters as much as the number.<\/p><p>A solid routine (how to&nbsp;<strong>measure TIR slitter knife<\/strong>&nbsp;repeatably):<\/p><ul><li>Measure arbor TIR first (so you don\u2019t blame the blade for a bent or damaged arbor).<\/li>\n\n<li>Then measure assembled TIR at:<ul><li>OD<\/li>\n\n<li>near the cutting edge (function-driving)<\/li>\n\n<li>one face (to detect wobble)<\/li><\/ul><\/li>\n\n<li>Repeat the check after re-seating once. If TIR changes materially, the problem is seating repeatability, not \u201crandomness.\u201d<\/li><\/ul><p>Many shops use edge TIR target bands that align with product tolerance and speed:<\/p><ul><li>High-precision slitting: aim around&nbsp;<strong>\u22640.01 mm (10 \u00b5m) edge TIR<\/strong><\/li>\n\n<li>General industrial slitting: often&nbsp;<strong>0.01\u20130.03 mm<\/strong><\/li>\n\n<li>Investigate aggressively if you approach the 0.02\u20130.04 mm band described in broader setup guidance, because edge quality and tool life typically degrade quickly beyond that.<\/li>\n\n<li>Maxtor Metal supplies inspection traceability records \u2014 including runout measurement, material certification, and heat-treat documentation \u2014 to support incoming quality verification and assembly repeatability.<\/li><\/ul><p>If you\u2019re also evaluating knife manufacturing controls and verification capability, see&nbsp;<a href=\"https:\/\/maxtormetal.com\/it\/prodotto\/lame-circolari\/\" target=\"_blank\" rel=\"noreferrer noopener\"><em><strong>Maxtor Metal circular slitter knives and blades<\/strong><\/em><\/a>&nbsp;for materials options and typical runout verification practices.<\/p><h3 class=\"wp-block-heading\" id=\"82b17d63-0586-40d8-a666-de4da775a9ac\">Balance grades and spin checks<\/h3><p>Once geometry and assembly are under control, balance keeps vibration from reintroducing dynamic runout.<\/p><p>Practical steps:<\/p><ul><li>Balance the assembly you actually spin (knife + clamp + spacers) when possible.<\/li>\n\n<li>Select a balance grade appropriate to your speed and sensitivity (common starting points are G 6.3 for general rotating assemblies and tighter grades like G 2.5 for higher-precision\/high-speed needs).<\/li>\n\n<li>If you need to formalize acceptance, use the purchased standard edition for the calculation and verification method. Official catalog pages:<ul><li>ISO 1940\u20111:2003 \u2014&nbsp;<em>Mechanical vibration \u2014 Balance quality requirements for rotors in a constant (rigid) state \u2014 Part 1: Specification and verification of balance tolerances<\/em>:&nbsp;<a href=\"https:\/\/www.iso.org\/standard\/27092.html\" target=\"_blank\" rel=\"noreferrer noopener\"><em><strong>https:\/\/www.iso.org\/standard\/27092.html<\/strong><\/em><\/a><\/li><\/ul><\/li><\/ul><h2 class=\"wp-block-heading\" id=\"bb921602-c518-42fe-992c-243b9c4fe6f6\">Case study: PET film slitting runout stabilization (anonymized)<\/h2><div class=\"wp-block-image\"><figure class=\"aligncenter size-full is-resized\"><img loading=\"lazy\" decoding=\"async\" width=\"1000\" height=\"1000\" src=\"https:\/\/maxtormetal.com\/wp-content\/uploads\/2024\/12\/Slitting-knife.jpg\" alt=\"Case study: PET film slitting runout stabilization (anonymized)\" class=\"wp-image-5613\" style=\"object-fit:cover;width:604px;height:auto\" srcset=\"https:\/\/maxtormetal.com\/wp-content\/uploads\/2024\/12\/Slitting-knife.jpg 1000w, https:\/\/maxtormetal.com\/wp-content\/uploads\/2024\/12\/Slitting-knife-300x300.jpg 300w, https:\/\/maxtormetal.com\/wp-content\/uploads\/2024\/12\/Slitting-knife-150x150.jpg 150w, https:\/\/maxtormetal.com\/wp-content\/uploads\/2024\/12\/Slitting-knife-768x768.jpg 768w, https:\/\/maxtormetal.com\/wp-content\/uploads\/2024\/12\/Slitting-knife-12x12.jpg 12w, https:\/\/maxtormetal.com\/wp-content\/uploads\/2024\/12\/Slitting-knife-600x600.jpg 600w, https:\/\/maxtormetal.com\/wp-content\/uploads\/2024\/12\/Slitting-knife-100x100.jpg 100w\" sizes=\"(max-width: 1000px) 100vw, 1000px\" \/><\/figure><\/div><p><strong>Application \/ industry:<\/strong>&nbsp;Flexible packaging PET film slitting (web converting).<\/p><p><strong>Setup snapshot:<\/strong>&nbsp;circular shear slitter knives,&nbsp;<strong>M2 high speed steel<\/strong>&nbsp;with mirror\u2011polished edge finish; OD&nbsp;<strong>130 mm<\/strong>, thickness&nbsp;<strong>1,0 millimetri<\/strong>, bore ID&nbsp;<strong>75 mm<\/strong>; line speed&nbsp;<strong>250\u2013580 m\/min<\/strong>; wrap shear slitting with pneumatically loaded top knife holders;&nbsp;<strong>16 slit lanes<\/strong>; web thickness&nbsp;<strong>23\u201350 \u00b5m PET<\/strong>&nbsp;used for laminated packaging structures.<\/p><h3 class=\"wp-block-heading\" id=\"7af4048d-d4b2-4701-b60a-c522a9a5dbd9\">The problem: \u201cunpredictable edge drift\u201d at high speed<\/h3><p>Above ~<strong>500 m\/min<\/strong>&nbsp;(especially on narrow slit widths below&nbsp;<strong>80 mm<\/strong>), the line showed intermittent burr, fine PET dust, slight edge cracking during acceleration, and unstable narrow trim behavior. Operators reported that one shift could run stable for hours, while the next shift produced burr immediately using the \u201csame settings.\u201d The converter ultimately stopped changing knife geometry and investigated&nbsp;<strong>assembled edge TIR<\/strong>&nbsp;and stack repeatability.<\/p><h3 class=\"wp-block-heading\" id=\"2603e279-db19-4b85-8b9f-2ca42fbbe19c\">Quantified results (before vs after)<\/h3><p><em>Note: The data below comes from Maxtor Metal\u2019s project support for a film converter; the customer name has been anonymized.<\/em><\/p><figure class=\"wp-block-table\"><table><tbody><tr><th>Parametro<\/th><th>Prima<\/th><th>After<\/th><\/tr><tr><td>Assembled edge TIR (near cutting edge)<\/td><td>18\u201324 \u00b5m<\/td><td>6\u20139 \u00b5m<\/td><\/tr><tr><td>OD TIR<\/td><td>12\u201316 \u00b5m<\/td><td>4\u20136 \u00b5m<\/td><\/tr><tr><td>Face wobble \/ axial runout<\/td><td>15\u201320 \u00b5m<\/td><td>5\u20138 \u00b5m<\/td><\/tr><tr><td>Burr \/ edge defect rate<\/td><td>4.5\u20136%<\/td><td>0.8\u20131.5%<\/td><\/tr><tr><td>Knife life<\/td><td>38\u201345 operating hours<\/td><td>62\u201378 operating hours<\/td><\/tr><tr><td>Slitting setup adjustment time<\/td><td>25\u201340 min<\/td><td>8\u201315 min<\/td><\/tr><\/tbody><\/table><\/figure><p>The converter considered the largest improvement not just the lower defect rate, but the reduction in&nbsp;<strong>between\u2011shift variability<\/strong>.<\/p><h3 class=\"wp-block-heading\" id=\"24adc3ed-3229-41f1-af3b-fed6446f4d46\">What didn\u2019t work (and why)<\/h3><p><strong>Attempt 1 \u2014 Increasing overlap (\u22480.45 \u2192 0.90 mm):<\/strong>&nbsp;incomplete cuts disappeared initially, but PET dust increased sharply, edge temperature rose, burr became more aggressive, and knife wear accelerated.<\/p><p><strong>Attempt 2 \u2014 Increasing side load:<\/strong>&nbsp;short\u2011term slit stability improved, but holder vibration increased, top knife heating became visible, face wobble sensitivity worsened, and knife life dropped below 35 hours.<\/p><h3 class=\"wp-block-heading\" id=\"f8715863-a936-4138-b33b-b877e3e11bec\">Root cause: stack-up + repeatability, not one \u201cbad knife\u201d<\/h3><p>The team found multiple small contributors:<\/p><ul><li>bore fit inconsistency between knife batches<\/li>\n\n<li>spacer parallelism variation<\/li>\n\n<li>residual contamination during assembly<\/li>\n\n<li>repeat\u2011clamping variation<\/li>\n\n<li>aggressive overlap amplifying small runout errors<\/li><\/ul><p>A key finding was that&nbsp;<strong>assembled edge TIR shifted significantly after re\u2011clamping<\/strong>, even when knife OD TIR alone looked acceptable.<\/p><h3 class=\"wp-block-heading\" id=\"3e316c45-e949-4314-86f6-e9c61990cf0c\">Controls implemented (the fixes that held)<\/h3><ol><li><strong>Bore fit optimization:<\/strong>&nbsp;moved from a loose H7\/g6\u2011style condition to a tighter controlled&nbsp;<strong>H7\/h6<\/strong>&nbsp;range to reduce micro\u2011movement and improve reassembly repeatability.<\/li>\n\n<li><strong>Bore\u2011to\u2011OD runout tightening (qualification):<\/strong>&nbsp;previous acceptance&nbsp;<strong>\u226415 \u00b5m<\/strong>; new acceptance&nbsp;<strong>\u22645\u20136 \u00b5m<\/strong>&nbsp;relative to the&nbsp;<strong>bore datum<\/strong>&nbsp;to reduce accumulated stack\u2011up error in multi\u2011knife assemblies.<\/li>\n\n<li><strong>Spacer &amp; face parallelism control:<\/strong>&nbsp;tightened spacer flatness inspection, removed damaged spacers, and checked end\u2011face parallelism during PM intervals; the converter found spacer inconsistency drove assembled wobble more than knife OD alone.<\/li>\n\n<li><strong>Standardized assembly procedure:<\/strong>&nbsp;arbor cleaned before every setup (lint\u2011free wipe mandatory), torque sequence standardized, and&nbsp;<strong>re\u2011seat + remeasure<\/strong>&nbsp;required after first clamp. Operators were not allowed to adjust overlap before TIR verification.<\/li>\n\n<li><strong>Overlap &amp; side clearance optimization:<\/strong>&nbsp;stable window: overlap&nbsp;<strong>0.50\u20130.65 mm<\/strong>, light\u2011to\u2011medium side load only, cant angle ~<strong>0.6\u00b0<\/strong>. Reducing overlap slightly improved edge quality because the web stayed supported longer inside the wrap zone.<\/li><\/ol><h3 class=\"wp-block-heading\" id=\"3d853927-8cc8-472e-a8c8-ec197d3dbf06\">Measurement method (what made it repeatable)<\/h3><ul><li>Indicator resolution:&nbsp;<strong>0.001 mm (1 \u00b5m)<\/strong>&nbsp;dial indicator<\/li>\n\n<li>Measurement points: knife OD near cutting edge, knife face \/ axial surface<\/li>\n\n<li>What was measured: individual knife TIR, assembled stack TIR, post\u2011clamping repeatability<\/li>\n\n<li>Re\u2011seat verification:&nbsp;<strong>S\u00cc<\/strong>&nbsp;(assemble \u2192 measure \u2192 disassemble\/clean \u2192 reassemble \u2192 remeasure)<\/li><\/ul><p>If assembled edge TIR shifted by more than ~<strong>3\u20134 \u00b5m<\/strong>&nbsp;after re\u2011seat, the team investigated spacers, arbor surface condition, and bore condition before touching overlap settings.<\/p><blockquote class=\"wp-block-quote is-layout-flow wp-block-quote-is-layout-flow\"><p><strong>Takeaway from the project:<\/strong>&nbsp;Overlap depth alone was not the root cause. Instability came from overlap interacting with assembly variation and side load\u2014so controlling the bore datum, faces\/spacers, and re\u2011seat repeatability stabilized the process at speed.<\/p><\/blockquote><h2 class=\"wp-block-heading\" id=\"8dac07a3-2c19-4ef9-9d33-b134a336bc0c\">Informazioni sull&#039;autore<\/h2><p><em>Jesse Xu \u2014 Senior Quality Engineer, QA (Quality Assurance), Maxtor Metal.<\/em>&nbsp;Jesse has 15 years of experience in custom industrial blades and slitting applications, with hands-on Failure Analysis capability to diagnose whether chipping and abnormal wear are driven by heat-treatment processes or by material segregation. Certifications: ASQ \u2013 CQE, ISO 9001 Lead Auditor, ASNT Level II.<\/p><h2 class=\"wp-block-heading\" id=\"2c157cde-3479-4158-ad4a-b55a8011e123\">Conclusione<\/h2><p>Stable high\u2011speed slitting is less about one \u201cmagic tolerance\u201d and more about repeatable location. Treat the bore as a functional datum, control the stack, and verify what matters at the cutting edge.<\/p><p><strong>Action checklist (use as an SOP starting point):<\/strong><\/p><ul><li>Define acceptance gates: assembled edge TIR, face wobble, and (if needed) balance\/vibration at speed.<\/li>\n\n<li>Verify the arbor first, then verify the assembled stack at the edge and on a face.<\/li>\n\n<li>Control what actually moves the number: seating cleanliness, spacer condition, clamp faces, and a consistent torque sequence.<\/li>\n\n<li>Use fit intent (e.g., H7\/h6 vs H7\/g6) to manage&nbsp;<em>repeatability risk<\/em>, not to \u201cfix\u201d a dirty stack.<\/li>\n\n<li>Build re-seat repeatability into your routine; if the number shifts after re-seat, fix repeatability before tuning overlap.<\/li><\/ul><p>Maxtor Metal supports build-to-print circular slitter knives with standards-based specifications and documentation (e.g., inspection reports for runout\/TIR and related geometric checks) to help teams keep performance repeatable across changeovers.<\/p><h2 class=\"wp-block-heading\" id=\"12418c47-143b-4b00-ba08-5b26f25acf10\">Standards &amp; reference notes (authoritative sources)<\/h2><ul><li><strong>ISO 286\u20111 \/ ISO 286\u20112 (fits &amp; tolerances):<\/strong>&nbsp;official ISO catalog pages \u2014<em><strong>&nbsp;<a href=\"https:\/\/www.iso.org\/standard\/52912.html\" target=\"_blank\" rel=\"noreferrer noopener\">https:\/\/<\/a><\/strong><\/em><a href=\"https:\/\/www.iso.org\/standard\/52912.html\" target=\"_blank\" rel=\"noreferrer noopener\"><strong><em>www.iso.org\/standard\/52912.html<\/em><\/strong><\/a>&nbsp;E&nbsp;<a href=\"https:\/\/www.iso.org\/standard\/52913.html\" target=\"_blank\" rel=\"noreferrer noopener\"><em><strong>https:\/\/www.iso.org\/standard\/52913.html<\/strong><\/em><\/a><\/li>\n\n<li><strong>ISO 1101:2017 (GPS geometrical tolerancing incl. run-out):<\/strong>&nbsp;official ISO catalog page \u2014&nbsp;<a href=\"https:\/\/www.iso.org\/standard\/66777.html\" target=\"_blank\" rel=\"noreferrer noopener\"><strong><em>https:\/\/www.iso.org\/standard\/66777.html<\/em><\/strong><\/a><\/li>\n\n<li><strong>ASME Y14.5 (GD&amp;T):<\/strong>&nbsp;official ASME catalog listing \u2014<strong><em>&nbsp;<a href=\"https:\/\/files.asme.org\/Catalog\/Codes\/PrintBook\/35976.pdf\" target=\"_blank\" rel=\"noreferrer noopener\">https<\/a><\/em><\/strong><a href=\"https:\/\/files.asme.org\/Catalog\/Codes\/PrintBook\/35976.pdf\" target=\"_blank\" rel=\"noreferrer noopener\"><strong><em>:\/\/files.asme.org\/Catalog\/Codes\/PrintBook\/35976.pdf<\/em><\/strong><\/a><\/li>\n\n<li><strong>ISO 1940\u20111:2003 (balance quality requirements, rigid rotors):<\/strong>&nbsp;official ISO catalog page \u2014&nbsp;<a href=\"https:\/\/www.iso.org\/standard\/27092.html\" target=\"_blank\" rel=\"noreferrer noopener\"><em><strong>https:\/\/www.iso.org\/standard\/27092.html<\/strong><\/em><\/a><\/li>\n\n<li><strong>ISO 21940\u201111:2016 (successor series for rotor balancing procedures\/tolerances):<\/strong>&nbsp;official ISO catalog page \u2014<em><strong>&nbsp;<a href=\"https:\/\/www.iso.org\/standard\/54074.html\" target=\"_blank\" rel=\"noreferrer noopener\">https:\/\/www.iso.org\/standard\/54074.html<\/a><\/strong><\/em><\/li>\n\n<li><strong>ISO 9001:2015 (quality management systems):<\/strong>&nbsp;official ISO catalog page \u2014<strong><em>&nbsp;<a href=\"https:\/\/www.iso.org\/standard\/62085.html\" target=\"_blank\" rel=\"noreferrer noopener\">https:\/\/www.iso.org\/standard\/62085.html<\/a><\/em><\/strong><\/li><\/ul><p><em>Nota:<\/em>&nbsp;Many standards are paywalled. This article links only to official catalog\/purchase pages and does not reproduce copyrighted tables. Always use the latest purchased edition and your internal specifications as the controlling documents.<\/p><div class=\"wp-block-image\"><figure class=\"aligncenter size-full\"><img loading=\"lazy\" decoding=\"async\" width=\"800\" height=\"800\" src=\"https:\/\/maxtormetal.com\/wp-content\/uploads\/2024\/06\/\u5206\u5207\u4e0b\u5200-31.jpg\" alt=\"lower slitter blade \" class=\"wp-image-4869\" style=\"aspect-ratio:3\/2;object-fit:cover\" srcset=\"https:\/\/maxtormetal.com\/wp-content\/uploads\/2024\/06\/\u5206\u5207\u4e0b\u5200-31.jpg 800w, https:\/\/maxtormetal.com\/wp-content\/uploads\/2024\/06\/\u5206\u5207\u4e0b\u5200-31-300x300.jpg 300w, https:\/\/maxtormetal.com\/wp-content\/uploads\/2024\/06\/\u5206\u5207\u4e0b\u5200-31-150x150.jpg 150w, https:\/\/maxtormetal.com\/wp-content\/uploads\/2024\/06\/\u5206\u5207\u4e0b\u5200-31-768x768.jpg 768w, https:\/\/maxtormetal.com\/wp-content\/uploads\/2024\/06\/\u5206\u5207\u4e0b\u5200-31-12x12.jpg 12w, https:\/\/maxtormetal.com\/wp-content\/uploads\/2024\/06\/\u5206\u5207\u4e0b\u5200-31-600x600.jpg 600w, https:\/\/maxtormetal.com\/wp-content\/uploads\/2024\/06\/\u5206\u5207\u4e0b\u5200-31-100x100.jpg 100w\" sizes=\"(max-width: 800px) 100vw, 800px\" \/><\/figure><\/div><h2 class=\"wp-block-heading\" id=\"01b37ac4-0b62-4a4a-9b24-bf0be8eb5aeb\">FAQ<\/h2><h3 class=\"wp-block-heading\" id=\"f9c55cc2-1916-4f33-8882-8aa896c544aa\">Domanda: Qual \u00e8 una tolleranza di runout accettabile per una lama da slitter sul filo di taglio?<\/h3><p>Risposta: Per molte linee, un range di partenza pratico \u00e8 \u22640,01 mm (10 \u00b5m) di TIR sul filo per il taglio ad alta precisione e 0,01\u20130,03 mm per il taglio industriale generale, con obiettivi pi\u00f9 rigorosi per materiali pi\u00f9 sottili e lame pi\u00f9 piccole.<\/p><h3 class=\"wp-block-heading\" id=\"83f5a338-dbf3-415e-bacb-1f7de5260491\">Domanda: Un accoppiamento del foro pi\u00f9 stretto riduce sempre il runout?<\/h3><p>Risposta: No. Un accoppiamento pi\u00f9 stretto pu\u00f2 migliorare la ripetibilit\u00e0 del centraggio, ma pu\u00f2 anche aumentare il rischio di deformazione e rendere l'accoppiamento pi\u00f9 sensibile alla contaminazione o a errori di planarit\u00e0 delle superfici. Il runout \u00e8 solitamente un accumulo di errori tra albero, superfici, distanziali e serraggio.<\/p><h3 class=\"wp-block-heading\" id=\"1065dbf0-e731-4386-9120-f486080c66f4\">Domanda: Come scegliere tra H7\/h6 e H7\/g6 per un albero (arbor) da 50 mm?<\/h3><p>Risposta: Utilizzate H7\/h6 quando la ripetibilit\u00e0 del centraggio \u00e8 critica e le condizioni di montaggio sono controllate. Utilizzate H7\/g6 quando i cambi frequenti richiedono un montaggio affidabile e potete controllare il runout tramite superfici\/piloti e componenti del pacco lame puliti e ortogonali.<\/p><h3 class=\"wp-block-heading\" id=\"b50408bb-2ea1-4732-87b2-9db66601a5cb\">Domanda: Cosa dovrei misurare per primo se il runout aumenta improvvisamente?<\/h3><p>Risposta: Iniziate con il TIR dell'albero, poi misurate il TIR del bordo assemblato e l'oscillazione delle facce (face wobble). Se le letture cambiano dopo aver riposizionato le parti, sospettate la presenza di bave, detriti, danni ai distanziali o problemi alle superfici di serraggio.<\/p><h3 class=\"wp-block-heading\" id=\"0f6f2463-52c1-4acd-a06b-e82ca0234a92\">Domanda: Qual \u00e8 la differenza tra runout e concentricit\u00e0 per le lame da slitter?<\/h3><p>Risposta: La concentricit\u00e0 \u00e8 un controllo geometrico pi\u00f9 complesso; nella pratica, le officine utilizzano spesso il runout (TIR) perch\u00e9 \u00e8 direttamente misurabile con comparatori e riflette la condizione funzionale dell'assemblaggio.<\/p><h3 class=\"wp-block-heading\" id=\"eb8b8b8b-101e-4798-a7f1-01c1582ecc20\">Domanda: Perch\u00e9 il runout peggiora alle alte velocit\u00e0, anche se il TIR statico sembra a posto?<\/h3><p>Risposta: Ad alta velocit\u00e0, piccoli errori geometrici possono innescare vibrazioni, flessibilit\u00e0 del disco sottile e risonanza. Ecco perch\u00e9 i controlli di bilanciamento\/rotazione e la rigidit\u00e0\/smorzamento sono fondamentali tanto quanto il TIR statico.<\/p><h3 class=\"wp-block-heading\" id=\"fff0fdf9-f81f-40e4-97e0-b3d8382956db\">Domanda: Quale grado di bilanciatura dovremmo puntare per lo slitting ad alta velocit\u00e0?<\/h3><p>Risposta: Iniziate con un grado industriale comune (spesso G 6.3) e rendetelo pi\u00f9 restrittivo (es. G 2.5) quando la velocit\u00e0, i requisiti di qualit\u00e0 o la sensibilit\u00e0 alle vibrazioni lo richiedono. Utilizzate la massa del rotore e gli RPM per calcolare lo squilibrio residuo ammissibile secondo le linee guida ISO.<\/p>","protected":false},"excerpt":{"rendered":"<p>High-speed slitting is unforgiving: if a circular knife doesn\u2019t rotate true, the cut edge quality degrades before the blade is even \u201cdull.\u201d In this article,&nbsp;Maxtor Metal&nbsp;ties&nbsp;central bore tolerance runout&nbsp;(how bore size + geometry show up as edge TIR at speed) to the numbers you can specify\u2014and the checks you can repeat. Engineering Note:&nbsp;For knife-level specifications, [&hellip;]<\/p>","protected":false},"author":1,"featured_media":5544,"comment_status":"closed","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[1,1209],"tags":[1266],"yoast_head":"<!-- This site is optimized with the Yoast SEO Premium plugin v23.6 (Yoast SEO v23.6) - https:\/\/yoast.com\/wordpress\/plugins\/seo\/ -->\n<title>Slitter Knife Runout Problems? Fix Central Bore Tolerance<\/title>\n<meta name=\"description\" content=\"Slitter vibration or bad edges? Match central bore tolerance to ISO 286 fits. 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