{"id":7675,"date":"2026-05-14T15:00:00","date_gmt":"2026-05-14T07:00:00","guid":{"rendered":"https:\/\/maxtormetal.com\/?p=7675"},"modified":"2026-05-13T14:15:44","modified_gmt":"2026-05-13T06:15:44","slug":"bottom-circular-knives-that-pair-with-top-knives-for-burr-free-slits","status":"publish","type":"post","link":"https:\/\/maxtormetal.com\/id\/bottom-circular-knives-that-pair-with-top-knives-for-burr-free-slits\/","title":{"rendered":"Bottom circular knives that pair with top knives for burr-free slits"},"content":{"rendered":"<div class=\"wp-block-image\"><figure class=\"aligncenter size-full is-resized\"><img loading=\"lazy\" decoding=\"async\" width=\"771\" height=\"764\" src=\"https:\/\/maxtormetal.com\/wp-content\/uploads\/2023\/10\/Knife-Rings1.jpg\" alt=\"Bottom circular knives that pair with top knives for burr-free slits\" class=\"wp-image-7186\" style=\"width:461px;height:auto\" srcset=\"https:\/\/maxtormetal.com\/wp-content\/uploads\/2023\/10\/Knife-Rings1.jpg 771w, https:\/\/maxtormetal.com\/wp-content\/uploads\/2023\/10\/Knife-Rings1-300x297.jpg 300w, https:\/\/maxtormetal.com\/wp-content\/uploads\/2023\/10\/Knife-Rings1-150x150.jpg 150w, https:\/\/maxtormetal.com\/wp-content\/uploads\/2023\/10\/Knife-Rings1-768x761.jpg 768w, https:\/\/maxtormetal.com\/wp-content\/uploads\/2023\/10\/Knife-Rings1-12x12.jpg 12w, https:\/\/maxtormetal.com\/wp-content\/uploads\/2023\/10\/Knife-Rings1-600x595.jpg 600w, https:\/\/maxtormetal.com\/wp-content\/uploads\/2023\/10\/Knife-Rings1-100x100.jpg 100w\" sizes=\"(max-width: 771px) 100vw, 771px\" \/><\/figure><\/div><ul><li>What readers will learn: pairing bottom circular knives with top knives for burr-free paper slitting<\/li>\n\n<li>Scope: setup parameters, materials and geometry, tolerances and QC, troubleshooting, and maintenance<\/li>\n\n<li>Outcome: higher OEE, longer tool life, stable quality, and lower TCO<\/li><\/ul><p><strong>Last updated:<\/strong>&nbsp;2026-05-12<\/p><blockquote class=\"wp-block-quote is-layout-flow wp-block-quote-is-layout-flow\"><p><strong>Catatan:<\/strong>&nbsp;Always verify knife geometry, overlap\/pressure, and safety procedures against your OEM slitter manual and holder design. The ranges below are starting points and must be validated on your line at low speed before running production.<\/p><\/blockquote><h2 class=\"wp-block-heading\" id=\"78ff3593-780d-4eb2-abfd-d6d1634021b6\">Shear slitting fundamentals<\/h2><p>Shear slitting is a controlled \u201cscissor cut\u201d between a top knife and a bottom knife. When the pair is set correctly, the web separates with minimal fuzz, low dust, and consistent slit width. When the pair is wrong, the same line can drift into burrs, glazing, heat, and chatter.<\/p><p>A practical way to think about burr-free slits is this: you\u2019re not buying a bottom circular knife in isolation. You\u2019re building a matched cutting system that includes the top knife, the holders, and the setup parameters that keep the cutting point stable.<\/p><h3 class=\"wp-block-heading\" id=\"a8377383-2883-42e7-862d-7685a9f8710b\">Roles of top vs. bottom knives<\/h3><p>The top knife typically provides the driven cutting edge and the \u201centry\u201d into the web. The bottom knife acts as the counter-edge and defines the support line where the shear actually happens. If either knife has runout, edge damage, or inconsistent face geometry, the cutting point moves around as the knives rotate.<\/p><p>In most shear setups, the bottom knife also has to stay dimensionally stable under side load. That stability is what lets you run less aggressive settings while still getting a clean cut.<\/p><h3 class=\"wp-block-heading\" id=\"8396f4f4-c44f-4610-94b3-64c8fd6a779d\">Shear mechanics: overlap, side load, cant angle<\/h3><p>Three setup variables do most of the work:<\/p><ul><li><strong>Overlap<\/strong>: how far the knives penetrate into each other\u2019s cutting path. Too little overlap can leave fibers uncut; too much increases heat and edge wear.<\/li>\n\n<li><strong>Side load<\/strong>: the lateral force that keeps the knives in contact. Too low encourages flutter and dusting; too high accelerates wear and can cause glazing.<\/li>\n\n<li><strong>Cant angle (toe-in)<\/strong>: the small angle that makes the cut progressive across the web instead of hitting the full width at once.<\/li><\/ul><p>DIENES notes that dust generation and cut quality issues often trace back to shear angle\/cutting point stability and system geometry rather than \u201cjust a dull blade\u201d (<em><strong><a href=\"https:\/\/www.dienesusa.com\/dust-generation-caused-by-the-shear-angle-cutting-point-and-the-geometry-of-the-knife-and-system\/\" target=\"_blank\" rel=\"noreferrer noopener nofollow\">DIENES: dust generation causes<\/a>)<\/strong><\/em>. Treat overlap, side load, and cant as a coupled system: change one, then re-verify the others.<\/p><h3 class=\"wp-block-heading\" id=\"bd26999d-c795-41c9-8b8a-42a959f8d2d1\">Wrap vs. tangent shear in paper converting<\/h3><p>Di dalam&nbsp;<strong>tangent shear<\/strong>, the web is cut at the tangent point with minimal wrap. It\u2019s usually easier to inspect and tune because the cutting zone is visible and the web tension path is straightforward.<\/p><p>Di dalam&nbsp;<strong>wrap shear<\/strong>, the web wraps around one of the knives, increasing contact and sometimes improving cut initiation on difficult grades. The tradeoff is that wrap setups can be more sensitive to tension, contamination, and heat buildup. If your process tends to dust or glaze, start with conservative wrap and prioritize cutting-point stability before increasing aggressiveness.<\/p><h2 class=\"wp-block-heading\" id=\"12d701ef-1bbb-4ed5-b4fd-aa344629dbb6\">Setup parameters by paper grade<\/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=\"Setup parameters by paper grade\" class=\"wp-image-5540\" style=\"width:520px;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>Paper behaves differently by grade: tissue can tear and fuzz under too much side load; coated papers can glaze when the interface gets hot; paperboard can push the system into vibration if the holders aren\u2019t rigid.<\/p><p>The goal is not to find one \u201cperfect\u201d setting. The goal is to standardize a starting range by grade, then verify and document the settings your machine and holders can hold consistently.<\/p><h3 class=\"wp-block-heading\" id=\"3a013653-d513-4399-ad75-ed603e13f973\">Recommended starting ranges: tissue, fine paper, coated, paperboard<\/h3><p>Use these as&nbsp;<strong>starting ranges<\/strong>, then tune in small steps. Your OEM\u2019s knife geometry and holder design may shift the optimal window.<\/p><figure class=\"wp-block-table\"><table><tbody><tr><th>Material grade (example)<\/th><th>Overlap (mm)<\/th><th>Side load (lbf)<\/th><th>Cant angle (\u00b0)<\/th><th>Typical risk if too aggressive<\/th><\/tr><tr><td>Tissue \/ soft paper<\/td><td>0.3\u20130.6<\/td><td>1\u20132<\/td><td>0.25<\/td><td>Wrinkling, tearing<\/td><\/tr><tr><td>Fine paper (general starting window)<\/td><td>0.4\u20130.75<\/td><td>2\u20134<\/td><td>0.25\u20130.5<\/td><td>Dusting, edge wear<\/td><\/tr><tr><td>Lightweight coated paper<\/td><td>0.4\u20130.8<\/td><td>1\u20133<\/td><td>0.25\u20130.5<\/td><td>Dust, heat, edge polishing<\/td><\/tr><tr><td>Label stock<\/td><td>0.5\u20130.8<\/td><td>1\u20134<\/td><td>0.25\u20130.5<\/td><td>Penumpukan perekat<\/td><\/tr><tr><td>Folding carton board<\/td><td>0.8\u20131.2<\/td><td>3\u20136<\/td><td>0.5\u20130.75<\/td><td>Fiber crush<\/td><\/tr><tr><td>Duplex board<\/td><td>1.0\u20131.5<\/td><td>4\u20138<\/td><td>0.5\u20130.75<\/td><td>Edge delamination<\/td><\/tr><\/tbody><\/table><\/figure><p><em>These are practical<\/em>&nbsp;<strong><em>starting windows<\/em><\/strong>&nbsp;<em>commonly used in converting. Definitions and optimal values vary by knife diameters, holder design, and web speed\u2014verify at low speed and document your stable window by grade.<\/em><\/p><p>For an operator mindset on safe, repeatable slitter adjustments, Valmet\u2019s guidance on positioning checks and systematic verification is a useful reference (<a href=\"https:\/\/www.valmet.com\/insights\/articles\/up-and-running\/performance\/SlitterAdjustments\/\" target=\"_blank\" rel=\"noreferrer noopener nofollow\"><em><strong>Valmet: slitter adjustments<\/strong><\/em><\/a>).<\/p><h3 class=\"wp-block-heading\" id=\"34947c5b-f747-408f-af31-c6563664a001\">Verification workflow: alignment, overlap, pressure, low-speed checks<\/h3><p>A fast way to prevent \u201cmystery burrs\u201d is to verify the cutting system in the same order every time:<\/p><ul><li><strong>Penyelarasan<\/strong>: confirm knives track true to the web path; check holders for looseness.<\/li>\n\n<li><strong>Overlap<\/strong>: set the target overlap, then confirm it holds across the shaft.<\/li>\n\n<li><strong>Pressure \/ side load<\/strong>: increase only to the point you get stable contact without heat.<\/li>\n\n<li><strong>Low-speed checks<\/strong>: run slow and inspect edges before going to production speed.<\/li><\/ul><p>Done right, this turns setup into a controlled process instead of a trial-and-error loop.<\/p><h3 class=\"wp-block-heading\" id=\"549beda7-fd4b-4563-b039-3a8286ac539b\">Scaling with speed: adjust side load and cant conservatively<\/h3><p>When you increase line speed, you usually need slightly more stability at the cutting point. Make changes conservatively:<\/p><ul><li>Increase side load in small steps and watch for temperature rise and glazing.<\/li>\n\n<li>Adjust cant angle only when the edge shows a clear failure mode (burrs, fuzzy edge, or uneven wear).<\/li>\n\n<li>Re-check runout and holder rigidity if vibration appears after a speed change.<\/li><\/ul><div class=\"wp-block-image\"><figure class=\"aligncenter\"><img loading=\"lazy\" decoding=\"async\" width=\"1536\" height=\"1024\" src=\"https:\/\/maxtormetal.com\/wp-content\/uploads\/2026\/05\/image-22.jpeg\" alt=\"Operational infographic showing overlap, side load, and cant angle ranges by paper grade\" class=\"wp-image-7677\" srcset=\"https:\/\/maxtormetal.com\/wp-content\/uploads\/2026\/05\/image-22.jpeg 1536w, https:\/\/maxtormetal.com\/wp-content\/uploads\/2026\/05\/image-22-300x200.jpeg 300w, https:\/\/maxtormetal.com\/wp-content\/uploads\/2026\/05\/image-22-1024x683.jpeg 1024w, https:\/\/maxtormetal.com\/wp-content\/uploads\/2026\/05\/image-22-768x512.jpeg 768w, https:\/\/maxtormetal.com\/wp-content\/uploads\/2026\/05\/image-22-18x12.jpeg 18w, https:\/\/maxtormetal.com\/wp-content\/uploads\/2026\/05\/image-22-600x400.jpeg 600w\" sizes=\"(max-width: 1536px) 100vw, 1536px\" \/><\/figure><\/div><h2 class=\"wp-block-heading\" id=\"4cb4af60-7b81-46d5-8782-15f171e50ed9\">Bottom circular knives: engineering selection<\/h2><div class=\"wp-block-image\"><figure class=\"aligncenter size-full is-resized\"><img loading=\"lazy\" decoding=\"async\" width=\"1000\" height=\"939\" src=\"https:\/\/maxtormetal.com\/wp-content\/uploads\/2024\/12\/Rotary-slit-blade.jpg\" alt=\"Bottom circular knives: engineering selection\" class=\"wp-image-5614\" style=\"aspect-ratio:1.3333333333333333;object-fit:cover;width:576px;height:auto\" srcset=\"https:\/\/maxtormetal.com\/wp-content\/uploads\/2024\/12\/Rotary-slit-blade.jpg 1000w, https:\/\/maxtormetal.com\/wp-content\/uploads\/2024\/12\/Rotary-slit-blade-300x282.jpg 300w, https:\/\/maxtormetal.com\/wp-content\/uploads\/2024\/12\/Rotary-slit-blade-768x721.jpg 768w, https:\/\/maxtormetal.com\/wp-content\/uploads\/2024\/12\/Rotary-slit-blade-13x12.jpg 13w, https:\/\/maxtormetal.com\/wp-content\/uploads\/2024\/12\/Rotary-slit-blade-600x563.jpg 600w\" sizes=\"(max-width: 1000px) 100vw, 1000px\" \/><\/figure><\/div><p>Bottom circular knives are doing two jobs at once: they provide the counter-edge and they keep the cutting point stable under side load and speed. Selection is mainly about matching&nbsp;<strong>material + hardness<\/strong>,&nbsp;<strong>edge geometry<\/strong>, Dan&nbsp;<strong>body geometry<\/strong>&nbsp;to your grade, speed, and uptime goals.<\/p><p>If you need a baseline overview of circular knife categories and common coatings across industries, MAXTOR METAL\u2019s<strong><em>\u00a0<a href=\"https:\/\/maxtormetal.com\/id\/produk\/pisau-bundar\/\" target=\"_blank\" rel=\"noreferrer noopener\">circular knives &amp; blades<\/a>\u00a0<\/em><\/strong>page summarizes typical materials, coating options, and inspection checkpoints.<\/p><h3 class=\"wp-block-heading\" id=\"4fdbc8db-3ba1-48b0-a0e6-631922b9f36f\">Materials and hardness: D2, M2, PM-HSS, carbide<\/h3><p>Material selection should reflect what actually drives wear in your line:<\/p><ul><li><strong>D2<\/strong>: good wear resistance and compressive strength for many converting applications; common choice when you want stable performance with predictable regrinds.<\/li>\n\n<li><strong>M2 (HSS)<\/strong>: higher hot hardness than D2; useful when heat at the edge is a recurring issue.<\/li>\n\n<li><strong>PM-HSS<\/strong>: more uniform carbide distribution than conventional HSS; often chosen when you want improved wear consistency and fewer micro-chips.<\/li>\n\n<li><strong>Karbit<\/strong>: excellent wear resistance and edge retention, but more brittle; it typically demands tighter runout control and stable holders to avoid chipping.<\/li><\/ul><p>Rather than chasing maximum hardness, prioritize consistency: stable heat treat, verified hardness, and geometry that your setup can support.<\/p><h3 class=\"wp-block-heading\" id=\"757d69ad-5af2-4e26-9fd4-033f1279f726\">Edge geometries: single\/double\/hollow, slim vs. standard<\/h3><p>Edge geometry is where \u201cburr-free\u201d lives or dies.<\/p><ul><li><strong>Single bevel<\/strong>\u00a0geometries can be more forgiving in some setups, but they may concentrate load at the cutting point.<\/li>\n\n<li><strong>Double bevel<\/strong>\u00a0edges can balance the cut, but they require alignment and overlap discipline.<\/li>\n\n<li><strong>Hollow-ground<\/strong>\u00a0edges can reduce contact area and help with some grades, but they are more sensitive to damage and regrind quality.<\/li><\/ul><p>For slim vs. standard bodies, consider stiffness and heat: slim profiles may reduce drag and dust in some systems, but a standard profile can be more stable when side load and speed rise.<\/p><h3 class=\"wp-block-heading\" id=\"9e76e943-91d4-495b-b991-ef9bbb16312d\">Dished vs. flat bottoms: selection by web and speed<\/h3><p>Body geometry affects how the knife pair contacts and how forgiving the system is to small alignment errors.<\/p><ul><li><strong>Dished bottom knives<\/strong>\u00a0can help stabilize the contact line and reduce sensitivity in some high-speed, thin-web setups.<\/li>\n\n<li><strong>Flat bottom knives<\/strong>\u00a0are straightforward and widely used, but they can be less forgiving when holders or shafts have marginal rigidity.<\/li><\/ul><p>The right choice depends on your web, speed, and how stable your holder stack-up is.<\/p><div class=\"wp-block-image\"><figure class=\"aligncenter\"><img loading=\"lazy\" decoding=\"async\" width=\"1536\" height=\"1024\" src=\"https:\/\/maxtormetal.com\/wp-content\/uploads\/2026\/05\/image-21.jpeg\" alt=\"Comparative diagram of dished vs flat bottom circular knives with pros\/cons\" class=\"wp-image-7676\" srcset=\"https:\/\/maxtormetal.com\/wp-content\/uploads\/2026\/05\/image-21.jpeg 1536w, https:\/\/maxtormetal.com\/wp-content\/uploads\/2026\/05\/image-21-300x200.jpeg 300w, https:\/\/maxtormetal.com\/wp-content\/uploads\/2026\/05\/image-21-1024x683.jpeg 1024w, https:\/\/maxtormetal.com\/wp-content\/uploads\/2026\/05\/image-21-768x512.jpeg 768w, https:\/\/maxtormetal.com\/wp-content\/uploads\/2026\/05\/image-21-18x12.jpeg 18w, https:\/\/maxtormetal.com\/wp-content\/uploads\/2026\/05\/image-21-600x400.jpeg 600w\" sizes=\"(max-width: 1536px) 100vw, 1536px\" \/><\/figure><\/div><h2 class=\"wp-block-heading\" id=\"783620d0-5494-4c6f-86c8-98114191a52c\">Tolerances, finishing, and QC<\/h2><div class=\"wp-block-image\"><figure class=\"aligncenter size-full is-resized\"><img loading=\"lazy\" decoding=\"async\" width=\"800\" height=\"800\" src=\"https:\/\/maxtormetal.com\/wp-content\/uploads\/2024\/06\/slitter111.jpg\" alt=\"Tolerances, finishing, and QC\" class=\"wp-image-4867\" style=\"width:496px;height:auto\" srcset=\"https:\/\/maxtormetal.com\/wp-content\/uploads\/2024\/06\/slitter111.jpg 800w, https:\/\/maxtormetal.com\/wp-content\/uploads\/2024\/06\/slitter111-300x300.jpg 300w, https:\/\/maxtormetal.com\/wp-content\/uploads\/2024\/06\/slitter111-150x150.jpg 150w, https:\/\/maxtormetal.com\/wp-content\/uploads\/2024\/06\/slitter111-768x768.jpg 768w, https:\/\/maxtormetal.com\/wp-content\/uploads\/2024\/06\/slitter111-12x12.jpg 12w, https:\/\/maxtormetal.com\/wp-content\/uploads\/2024\/06\/slitter111-600x600.jpg 600w, https:\/\/maxtormetal.com\/wp-content\/uploads\/2024\/06\/slitter111-100x100.jpg 100w\" sizes=\"(max-width: 800px) 100vw, 800px\" \/><\/figure><\/div><p>Even a strong material and a good geometry can\u2019t compensate for a knife that doesn\u2019t run true. In shear slitting, tolerances determine whether the cutting point stays stable or \u201cwalks\u201d as the knives rotate.<\/p><h3 class=\"wp-block-heading\" id=\"a2966727-c73a-44f0-858f-ce5144e432f8\">Runout, concentricity, and face parallelism targets<\/h3><p>Your OEM\u2019s specification is the authority, but these are typical targets many plants use as a starting point for stability. The key is controlling&nbsp;<strong>slitter knife runout<\/strong>&nbsp;so the cutting point doesn\u2019t move as the pair rotates:<\/p><ul><li><strong>Radial\/axial runout (TIR)<\/strong>: keep as low as practical for your speed; tighter targets reduce chatter risk.<\/li>\n\n<li><strong>Concentricity<\/strong>: the cutting edge should stay centered to avoid periodic load spikes.<\/li>\n\n<li><strong>Face parallelism<\/strong>: consistent faces help you hold overlap and side load without creating hot spots.<\/li><\/ul><p>If you see burrs that come and go at a fixed interval, treat it as a runout\/concentricity clue before you change overlap.<\/p><p>A practical way to make these targets actionable is to tie them to line speed tiers (example bands below). Use them as&nbsp;<strong>internal control targets<\/strong>&nbsp;unless your OEM specifies otherwise.<\/p><figure class=\"wp-block-table\"><table><tbody><tr><th>Line speed<\/th><th>Typical application<\/th><th>Radial TIR<\/th><th>Axial face parallelism<\/th><th>Concentricity<\/th><\/tr><tr><td>Low speed (&lt;150 m\/min)<\/td><td>General paper \/ board<\/td><td>\u22640.03\u20130.05 mm<\/td><td>\u22640.02 mm<\/td><td>\u22640.03\u20130.05 mm<\/td><\/tr><tr><td>Medium speed (150\u2013400 m\/min)<\/td><td>Coated paper \/ film<\/td><td>\u22640.02\u20130.03 mm<\/td><td>\u22640.01\u20130.015 mm<\/td><td>\u22640.02\u20130.03 mm<\/td><\/tr><tr><td>High speed (&gt;400 m\/min)<\/td><td>Film \/ battery \/ precision foil<\/td><td>\u22640.01\u20130.015 mm<\/td><td>\u22640.005\u20130.01 mm<\/td><td>\u22640.01\u20130.02 mm<\/td><\/tr><\/tbody><\/table><\/figure><p><em>Note: these are example control bands. Your knife diameters, holder stiffness, bearing condition, and inspection method (indicator setup) can shift what is achievable. Always follow OEM limits first.<\/em><\/p><h3 class=\"wp-block-heading\" id=\"fbb27c0c-0101-43cf-b27b-a8889a0dd936\">Inspection and traceability: gauges, reports, and regrind records<\/h3><h3 class=\"wp-block-heading\" id=\"bbe786db-98ae-45ea-9311-b3006cb1505c\">Surface finish (roughness) and why it matters<\/h3><p>Surface finish influences friction at the interface, which in turn affects heat generation, dusting, and pickup tendency (especially on coated grades and adhesive label stock). As a rule:&nbsp;<strong>improve geometry stability first<\/strong>, then use finish as a friction-control lever.<\/p><figure class=\"wp-block-table\"><table><tbody><tr><th>Surface type<\/th><th>Typical recommendation<\/th><\/tr><tr><td>General paper slitting<\/td><td>Ra \u22640.4 \u03bcm<\/td><\/tr><tr><td>Precision foil \/ film<\/td><td>Ra 0.05\u20130.2 \u03bcm<\/td><\/tr><tr><td>High-speed coated materials<\/td><td>Highly polished finish recommended<\/td><\/tr><\/tbody><\/table><\/figure><p>Track what matters for repeatability:<\/p><ul><li>Incoming material certification and heat\/lot records<\/li>\n\n<li>Pre- and post-grind inspection results (runout, face parallelism)<\/li>\n\n<li>Regrind count, removed material, and restored edge geometry<\/li><\/ul><p>MAXTOR METAL supports \u00b5m-level inspection reports, material certificates, and serial-based regrind records, and can build custom OEM replacements from drawings or samples to keep matched knife sets consistent.<\/p><p>Below are simple&nbsp;<strong>templates<\/strong>&nbsp;you can copy into your internal work instructions. Adapt fields and limits to your OEM spec and measurement method.<\/p><p><strong>Example slitter knife QC checklist<\/strong><\/p><figure class=\"wp-block-table\"><table><tbody><tr><th>Inspection item<\/th><th>Target<\/th><th>Hasil<\/th><th>Status<\/th><\/tr><tr><td>Radial TIR<\/td><td>\u22640.02 mm<\/td><td>____<\/td><td>PASS \/ FAIL<\/td><\/tr><tr><td>Axial runout<\/td><td>\u22640.01 mm<\/td><td>____<\/td><td>PASS \/ FAIL<\/td><\/tr><tr><td>Face parallelism<\/td><td>\u22640.01 mm<\/td><td>____<\/td><td>PASS \/ FAIL<\/td><\/tr><tr><td>Surface finish<\/td><td>Ra \u22640.4 \u03bcm<\/td><td>____<\/td><td>PASS \/ FAIL<\/td><\/tr><tr><td>Edge condition<\/td><td>No chips \/ pickup<\/td><td>____<\/td><td>PASS \/ FAIL<\/td><\/tr><tr><td>Thickness tolerance<\/td><td>Within spec<\/td><td>____<\/td><td>PASS \/ FAIL<\/td><\/tr><tr><td>Holder cleanliness<\/td><td>Clean<\/td><td>____<\/td><td>PASS \/ FAIL<\/td><\/tr><tr><td>Torque verified<\/td><td>Ya<\/td><td>____<\/td><td>PASS \/ FAIL<\/td><\/tr><\/tbody><\/table><\/figure><p><strong>Regrind record template<\/strong><\/p><figure class=\"wp-block-table\"><table><tbody><tr><th>Knife ID<\/th><th>Bahan<\/th><th>Original OD<\/th><th>Current OD<\/th><th>Regrind count<\/th><th>Last run length<\/th><th>Observed wear<\/th><\/tr><tr><td>TK-2048<\/td><td>Karbit<\/td><td>220 mm<\/td><td>216 mm<\/td><td>4<\/td><td>28 km<\/td><td>Minor pickup<\/td><\/tr><tr><td>TK-2051<\/td><td>HSS<\/td><td>180 mm<\/td><td>176 mm<\/td><td>3<\/td><td>12 km<\/td><td>Edge rounding<\/td><\/tr><tr><td>TK-2055<\/td><td>Karbit<\/td><td>260 mm<\/td><td>255 mm<\/td><td>5<\/td><td>35 km<\/td><td>Stable<\/td><\/tr><\/tbody><\/table><\/figure><p><strong>Inspection frequency (typical)<\/strong><\/p><figure class=\"wp-block-table\"><table><tbody><tr><th>Inspection type<\/th><th>Typical frequency<\/th><\/tr><tr><td>Visual edge inspection<\/td><td>Setiap shift<\/td><\/tr><tr><td>Burr verification<\/td><td>Every roll change<\/td><\/tr><tr><td>TIR verification<\/td><td>Weekly or after knife crash<\/td><\/tr><tr><td>Surface finish check<\/td><td>After regrinding<\/td><\/tr><tr><td>Full dimensional inspection<\/td><td>Every regrind cycle<\/td><\/tr><\/tbody><\/table><\/figure><h3 class=\"wp-block-heading\" id=\"5dead195-2e67-415e-bf4e-d14201a7af94\">Finishing and coatings: mirror polish, TiN\/TiAlN\/CrN<\/h3><p>Finishing and coatings should be selected for the failure mode you\u2019re seeing, not as a default upgrade.<\/p><ul><li><strong>Mirror polish<\/strong>\u00a0can reduce friction and help on grades that tend to dust or heat.<\/li>\n\n<li><strong>TiN \/ TiAlN \/ CrN coatings<\/strong>\u00a0can improve wear resistance and reduce galling, but only if the base edge geometry and runout are already under control.<\/li><\/ul><p>If coatings \u201cfail fast,\u201d it\u2019s often a sign of heat, overload, or unstable contact rather than a coating problem.<\/p><h2 class=\"wp-block-heading\" id=\"fcb6b305-2abd-4eda-ab50-452525ae3012\">Troubleshooting burrs, dust, and vibration<\/h2><div class=\"wp-block-image\"><figure class=\"aligncenter size-full is-resized\"><img loading=\"lazy\" decoding=\"async\" width=\"800\" height=\"800\" src=\"https:\/\/maxtormetal.com\/wp-content\/uploads\/2023\/10\/Bottom-slitter-knives-detail11.jpg\" alt=\"Troubleshooting burrs, dust, and vibration\" class=\"wp-image-2960\" style=\"width:508px;height:auto\" srcset=\"https:\/\/maxtormetal.com\/wp-content\/uploads\/2023\/10\/Bottom-slitter-knives-detail11.jpg 800w, https:\/\/maxtormetal.com\/wp-content\/uploads\/2023\/10\/Bottom-slitter-knives-detail11-300x300.jpg 300w, https:\/\/maxtormetal.com\/wp-content\/uploads\/2023\/10\/Bottom-slitter-knives-detail11-150x150.jpg 150w, https:\/\/maxtormetal.com\/wp-content\/uploads\/2023\/10\/Bottom-slitter-knives-detail11-768x768.jpg 768w, https:\/\/maxtormetal.com\/wp-content\/uploads\/2023\/10\/Bottom-slitter-knives-detail11-600x600.jpg 600w, https:\/\/maxtormetal.com\/wp-content\/uploads\/2023\/10\/Bottom-slitter-knives-detail11-100x100.jpg 100w\" sizes=\"(max-width: 800px) 100vw, 800px\" \/><\/figure><\/div><p>Troubleshooting is fastest when you change one variable at a time and verify at low speed. DIENES\u2019 overview of common shear slitting problems is a good reminder that dust is often an early indicator of a geometry or setup issue (<em><strong><a href=\"https:\/\/www.dienesusa.com\/6-of-the-most-common-problems-found-in-shear-slitting\/\" target=\"_blank\" rel=\"noreferrer noopener nofollow\">DIENES: common problems<\/a>)<\/strong><\/em>.<\/p><figure class=\"wp-block-table\"><table><tbody><tr><th>Symptom you see<\/th><th>Most likely root cause (first)<\/th><th>First checks (before changing settings)<\/th><th>Safe, reversible adjustments (one at a time)<\/th><\/tr><tr><td>Dusting \/ fuzzy edges<\/td><td>Cutting point not stable; overlap too high\/low; dull or micro-chipped edge<\/td><td>Check knife damage under magnification; verify holder bearings; verify alignment and runout<\/td><td>Nudge overlap in small steps; increase side load only until stable contact (avoid heat); reduce cant if rubbing\/heat appears<\/td><\/tr><tr><td>Burrs + glazing \/ heat tinting<\/td><td>Excessive side load, too much cant, finish mismatch, or rubbing from misalignment<\/td><td>Check temperature rise; check face parallelism; confirm contact line is progressive (not rubbing across full width)<\/td><td>Reduce side load first; then reduce cant slightly; verify overlap is not excessive; consider polish\/coating only after geometry is stable<\/td><\/tr><tr><td>Chatter \/ vibration (especially at speed)<\/td><td>Runout, stack-up looseness, holder stiffness\/resonance<\/td><td>Check spacers\/stack tightness; re-check radial\/axial runout; inspect shafts and bearings<\/td><td>Reduce side load; back down speed to confirm resonance; correct runout\/stack-up before increasing overlap or cant<\/td><\/tr><\/tbody><\/table><\/figure><p><em>Tip: if edge quality varies cyclically (good\u2013bad\u2013good at a fixed interval), treat it as a runout\/concentricity\/stack-up clue before changing overlap or pressure.<\/em><\/p><h3 class=\"wp-block-heading\" id=\"795b6028-1521-4833-9e77-ef97c614e816\">Dusting and fuzzy edges: overlap, side load, and edge sharpness<\/h3><p>If you see dusting or a fuzzy edge, start with the cutting point and contact stability:<\/p><ul><li>Reduce overlap slightly if fibers are being torn rather than sheared.<\/li>\n\n<li>Increase side load only until contact is stable; avoid crushing the interface.<\/li>\n\n<li>Inspect edge sharpness and micro-chipping; a \u201csharp-looking\u201d edge can still be damaged at the micro level.<\/li><\/ul><p>Also check holder bearings and shaft rigidity before chasing parameter changes.<\/p><h3 class=\"wp-block-heading\" id=\"6afac036-a500-4097-b743-81ddf28158b5\">Burrs and glazing: cant angle, heat, and finish mismatch<\/h3><p>Burrs and glazing often show up together when the interface runs hot.<\/p><ul><li>Add or refine cant angle only in small steps to get a progressive cut.<\/li>\n\n<li>Reduce side load if you see heat tinting, glazing, or rapid edge rounding.<\/li>\n\n<li>Match finish\/coating to the grade: a rougher finish can increase friction on sensitive coatings and make glazing more likely.<\/li><\/ul><h3 class=\"wp-block-heading\" id=\"d3d1e44f-e8d3-4456-97f3-590caef41be9\">Chatter and vibration: alignment, runout, and holder stability<\/h3><p>Chatter is typically a system stiffness problem first, and a knife problem second.<\/p><ul><li>Verify alignment and stack-up: loose spacers and unstable holders create periodic vibration.<\/li>\n\n<li>Re-check runout before increasing side load.<\/li>\n\n<li>If vibration starts only at higher speed, step back and confirm the holders can support the new speed without resonance.<\/li><\/ul><h2 class=\"wp-block-heading\" id=\"a3975f0c-c60a-479b-9a89-d4b09d5b0f5e\">Kesimpulan<\/h2><ul><li>Standardize parameters by grade and document verified settings<\/li>\n\n<li>Select materials\/geometries to match speed, grade, and uptime goals<\/li>\n\n<li>Inspect tolerances, finish, and track regrinds to extend tool life<\/li><\/ul><h2 class=\"wp-block-heading\" id=\"500d4d00-a94b-4135-9394-8ebe4dc5a755\">References (selected)<\/h2><ul><li>DIENES: Dust generation caused by the shear angle, cutting point and the geometry of the knife and system \u2014\u00a0<a href=\"https:\/\/www.dienesusa.com\/dust-generation-caused-by-the-shear-angle-cutting-point-and-the-geometry-of-the-knife-and-system\/\" target=\"_blank\" rel=\"noreferrer noopener nofollow\"><em><strong>https:\/\/www.dienesusa.com\/dust-generation-caused-by-the-shear-angle-cutting-point-and-the-geometry-of-the-knife-and-system\/<\/strong><\/em><\/a><\/li>\n\n<li>Valmet: Slitter adjustments (positioning checks and systematic verification) \u2014\u00a0<a href=\"https:\/\/www.valmet.com\/insights\/articles\/up-and-running\/performance\/SlitterAdjustments\/\" target=\"_blank\" rel=\"noreferrer noopener nofollow\"><strong><em>https:\/\/www.valmet.com\/insights\/articles\/up-and-running\/performance\/SlitterAdjustments\/<\/em><\/strong><\/a><\/li>\n\n<li>Carolina Knife:\u00a0<em>Principles of shear slitting<\/em>\u00a0(definitions of overlap\/penetration and typical side load ranges) \u2014\u00a0<a href=\"https:\/\/www.carolinaknife.com\/wp-content\/uploads\/2020\/07\/Principles_of_shear_splitting-1.pdf\" target=\"_blank\" rel=\"noreferrer noopener nofollow\"><strong><em>https:\/\/www.carolinaknife.com\/wp-content\/uploads\/2020\/07\/Principles_of_shear_splitting-1.pdf<\/em><\/strong><\/a><\/li><\/ul><h2 class=\"wp-block-heading\" id=\"d459d63d-be33-433b-b551-431a11093285\">Tentang penulis<\/h2><p><strong>Nancy Wu<\/strong>&nbsp;\u2014 Senior Manufacturing Engineer, Production Engineering (PE). 12 years of experience in industrial blade manufacturing and grinding, with deep familiarity in D2, M2, H13, PM steels, and carbide processing and coating behavior. Skilled in high-precision CNC grinding programming.<\/p><p>Certifications: SME\u2013CMfgE, PMP, Six Sigma Black Belt, ASM International Certifications.<\/p><h2 class=\"wp-block-heading\" id=\"239ad33a-dfc6-44a3-bde4-2901d403984a\">FAQ<\/h2><h3 class=\"wp-block-heading\" id=\"4ce15eef-6114-4c03-a112-6ae645d2d6b7\">What causes burrs in paper shear slitting?<\/h3><p>Burrs usually come from an unstable cutting point: too much overlap, excessive side load, incorrect cant angle, or runout that moves the shear interface. Start by verifying alignment and runout, then adjust overlap and cant in small steps.<\/p><h3 class=\"wp-block-heading\" id=\"696003b5-057a-4626-9776-bfe80e2ffce7\">How do I set overlap and side load for tissue vs. paperboard?<\/h3><p>Start conservatively for tissue (low overlap and side load to avoid tearing) and increase both for paperboard only as the holder stack-up allows. Always validate at low speed and document the stable window for each grade.<\/p><h3 class=\"wp-block-heading\" id=\"d4d8603c-0dd1-4acd-aced-4551a8f2624f\">What is cant angle (toe-in) and how does it affect dusting?<\/h3><p>Cant angle makes the cut progressive across the web. Too little cant can increase tearing and dusting on some grades; too much can drive heat and uneven wear. Tune cant after overlap and side load are stable.<\/p><h3 class=\"wp-block-heading\" id=\"f60f12ce-3e1b-4997-86f8-b8173c37e5f4\">When should I choose a dished bottom circular knife instead of a flat one?<\/h3><p>Choose dished bottoms when you need a more forgiving contact line at higher speeds or on thinner webs, especially if small alignment variation is hard to eliminate. Flat bottoms work well when holders and shafts are rigid and runout is tightly controlled.<\/p><h3 class=\"wp-block-heading\" id=\"73b3b50c-291c-4f2d-95ea-348740bd07e5\">Which material is best for bottom circular knives: D2, HSS, PM-HSS, or carbide?<\/h3><p>There isn\u2019t one best material. D2 is a common baseline; HSS\/PM-HSS can handle heat and wear more consistently; carbide offers strong wear resistance but needs tighter runout control to avoid chipping. Match the material to your dominant wear mode and holder stability.<\/p><h3 class=\"wp-block-heading\" id=\"678a83ac-4a1a-493f-bf8c-f1cd44810d33\">What tolerances matter most for burr-free slits?<\/h3><p>Runout (axial and radial), concentricity, and face parallelism matter most because they keep the cutting point stable. If edge quality varies cyclically, treat it as a tolerance\/holder issue before changing overlap.<\/p><h3 class=\"wp-block-heading\" id=\"661f28c2-dbc4-416c-8026-892d0a43b993\">How do I reduce dust without overloading the knives?<\/h3><p>Verify the cutting point first: correct alignment, minimal runout, and a sharp, undamaged edge. Then tune overlap and side load in small increments, and keep cant angle only as high as needed for a progressive cut.<\/p>","protected":false},"excerpt":{"rendered":"<p>Last updated:&nbsp;2026-05-12 Note:&nbsp;Always verify knife geometry, overlap\/pressure, and safety procedures against your OEM slitter manual and holder design. The ranges below are starting points and must be validated on your line at low speed before running production. Shear slitting fundamentals Shear slitting is a controlled \u201cscissor cut\u201d between a top knife and a bottom knife. [&hellip;]<\/p>","protected":false},"author":1,"featured_media":7186,"comment_status":"closed","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[1,1209],"tags":[1230],"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>Bottom circular knives that pair with top knives for burr-free slits - Metal Industrial, Industrial Blade Manufacturer, Cutting Knives and blades, Machine Knives and blades supplier, Custom Blades solution<\/title>\n<meta name=\"description\" content=\"Learn to pair top and bottom circular knives for burr-free slits: setup ranges by paper grade, selection criteria, QC tolerances, and fixes.\" \/>\n<meta name=\"robots\" content=\"index, follow, max-snippet:-1, max-image-preview:large, max-video-preview:-1\" \/>\n<link rel=\"canonical\" href=\"https:\/\/maxtormetal.com\/id\/bottom-circular-knives-that-pair-with-top-knives-for-burr-free-slits\/\" \/>\n<meta property=\"og:locale\" content=\"id_ID\" \/>\n<meta property=\"og:type\" content=\"article\" \/>\n<meta property=\"og:title\" content=\"Bottom circular knives that pair with top knives for burr-free slits\" \/>\n<meta property=\"og:description\" content=\"Learn to pair top and bottom circular knives for burr-free slits: setup ranges by paper grade, selection criteria, QC tolerances, and fixes.\" \/>\n<meta property=\"og:url\" content=\"https:\/\/maxtormetal.com\/id\/bottom-circular-knives-that-pair-with-top-knives-for-burr-free-slits\/\" \/>\n<meta property=\"og:site_name\" content=\"Metal Industrial, Industrial Blade Manufacturer, Cutting Knives and blades, Machine Knives and blades supplier, Custom Blades solution\" \/>\n<meta property=\"article:publisher\" content=\"https:\/\/www.facebook.com\/mengli.tang.3\" \/>\n<meta property=\"article:author\" content=\"https:\/\/www.facebook.com\/mengli.tang.3\" \/>\n<meta property=\"article:published_time\" content=\"2026-05-14T07:00:00+00:00\" \/>\n<meta property=\"article:modified_time\" content=\"2026-05-13T06:15:44+00:00\" \/>\n<meta property=\"og:image\" content=\"https:\/\/maxtormetal.com\/wp-content\/uploads\/2023\/10\/Knife-Rings1.jpg\" \/>\n\t<meta property=\"og:image:width\" content=\"771\" \/>\n\t<meta property=\"og:image:height\" content=\"764\" \/>\n\t<meta property=\"og:image:type\" content=\"image\/jpeg\" \/>\n<meta name=\"author\" content=\"Tommy\" \/>\n<meta name=\"twitter:card\" content=\"summary_large_image\" \/>\n<meta name=\"twitter:creator\" content=\"@MengliT13570\" \/>\n<meta name=\"twitter:site\" content=\"@MengliT13570\" \/>\n<script type=\"application\/ld+json\" class=\"yoast-schema-graph\">{\"@context\":\"https:\/\/schema.org\",\"@graph\":[{\"@type\":[\"Article\",\"BlogPosting\"],\"@id\":\"https:\/\/maxtormetal.com\/bottom-circular-knives-that-pair-with-top-knives-for-burr-free-slits\/#article\",\"isPartOf\":{\"@id\":\"https:\/\/maxtormetal.com\/bottom-circular-knives-that-pair-with-top-knives-for-burr-free-slits\/\"},\"author\":{\"name\":\"Tommy\",\"@id\":\"https:\/\/maxtormetal.com\/fr\/#\/schema\/person\/94f8f44e6d04f5d162dc94aeca3da13a\"},\"headline\":\"Bottom circular knives that pair with top knives for burr-free slits\",\"datePublished\":\"2026-05-14T07:00:00+00:00\",\"dateModified\":\"2026-05-13T06:15:44+00:00\",\"mainEntityOfPage\":{\"@id\":\"https:\/\/maxtormetal.com\/bottom-circular-knives-that-pair-with-top-knives-for-burr-free-slits\/\"},\"wordCount\":2822,\"publisher\":{\"@id\":\"https:\/\/maxtormetal.com\/fr\/#organization\"},\"image\":{\"@id\":\"https:\/\/maxtormetal.com\/bottom-circular-knives-that-pair-with-top-knives-for-burr-free-slits\/#primaryimage\"},\"thumbnailUrl\":\"https:\/\/maxtormetal.com\/wp-content\/uploads\/2023\/10\/Knife-Rings1.jpg\",\"keywords\":[\"Bottom Circular Knives\"],\"articleSection\":[\"Blog\",\"Circular Knives\"],\"inLanguage\":\"id\"},{\"@type\":\"WebPage\",\"@id\":\"https:\/\/maxtormetal.com\/bottom-circular-knives-that-pair-with-top-knives-for-burr-free-slits\/\",\"url\":\"https:\/\/maxtormetal.com\/bottom-circular-knives-that-pair-with-top-knives-for-burr-free-slits\/\",\"name\":\"Bottom circular knives that pair with top knives for burr-free slits - 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