त्वरित उत्तर: शीयर ब्लेड क्लीयरेंस सामग्री की मोटाई के 5-10% पर सेट किया जाता है, जिसे कटिंग पॉइंट पर मापा जाता है। 6 मिमी माइल्ड स्टील के लिए, इसका मतलब 0.30-0.60 मिमी का अंतर है - लेकिन यह प्रतिशत एक शुरुआती सीमा है, अंतिम उत्तर नहीं। अपनी वास्तविक सामग्री पर एक टेस्ट कट के साथ कार्यशील मान की पुष्टि करें, फीलर गेज के साथ ब्लेड के साथ तीन बिंदुओं पर क्लीयरेंस की जांच करें, और मोटाई के 5% से अधिक किसी भी गड़द (Burr) की ऊंचाई को क्लीयरेंस की फिर से जांच करने का संकेत मानें।
इंजीनियरिंग नोट: शीयर ब्लेड क्लीयरेंस ऊपरी और निचले कटिंग किनारों के बीच का लंबवत अंतर (perpendicular gap) है, जिसे सामग्री की मोटाई के प्रतिशत के रूप में व्यक्त किया जाता है। यह कटे हुए किनारे पर पॉलिश किए गए और टूटे हुए क्षेत्र के अनुपात, गड़द (burr) की ऊंचाई और प्रति स्ट्रोक ब्लेड लोड को नियंत्रित करता है। Maxtor Metal का सेटअप और QC वर्कफ़्लो क्लीयरेंस को एक सामग्री-विशिष्ट प्रक्रिया पैरामीटर के रूप में मानता है - न कि एक निश्चित मशीन सेटिंग - और ब्लेड की स्थिति और एज रेडियस रीडिंग के साथ प्रत्येक जॉब के लिए इसका दस्तावेزیकरण (document) करता है।[→ See Maxtor Metal shear blade specifications and material options]
शीयर ब्लेड क्लीयरेंस कटिंग पॉइंट पर ऊपरी और निचले ब्लेड किनारों के बीच का क्षैतिज अंतर (horizontal gap) है, और गिलोटिन शीयर पर इसे आमतौर पर एक निश्चित संख्या के बजाय सामग्री की मोटाई के प्रतिशत के रूप में सेट किया जाता है। इसे गलत सेट करने की लागत अमूर्त नहीं है: खराब किनारे की गुणवत्ता से स्ट्रैप स्क्रैप स्वामित्व की कुल लागत (TCO) का 5%–10% हिस्सा बनता है — एक ऐसा आंकड़ा जो प्रत्येक रीग्राइंड चक्र में बढ़ता जाता है।
The 5–10 percent rule is a starting range rather than a specification. Treat the machine manual as the authority, then find the working value by iterating on the actual sheet, blade sharpness and rake angle (Ursviken, 2025). Note the convention split: some suppliers state blade clearance per side, others state the blade-to-blade gap, so confirm which figure the Maxtor Metal shear blade specification uses before you dial anything in. Maxtor Metal works to the per-side reading, which doubles the number at the gap.
चाबी छीनना
- शीयर ब्लेड क्लीयरेंस सामग्री की मोटाई का एक प्रतिशत है, जिसे कटिंग पॉइंट पर सेट किया जाता है।
- 5–10% की सीमा एक शुरुआती दायरा है; अंतिम मान मशीन मैनुअल द्वारा निर्धारित होता है।
- पुष्टि करें कि प्रकाशित आंकड़ा प्रति-तरफ ब्लेड क्लीयरेंस है या कुल ब्लेड-से-ब्लेड अंतर।
- खराब किनारे की गुणवत्ता स्ट्रिप स्क्रैप के माध्यम से स्वामित्व की कुल लागत (TCO) का 5%–10% हिस्सा बढ़ाती है।
स्रोतों पर एक नोट: यह गाइड कतरन (shear-cutting) संदर्भों पर आधारित है - AHSS दिशानिर्देश, ispatguru के कतरन प्रक्रिया दस्तावेज, और उर्सविकन (Ursviken) और सूरे (Sureay) के उपकरण निर्माता मार्गदर्शन - साथ ही Maxtor Metal के अपने दुकान के फर्श (shop-floor) के अनुभव। जहां कोई आंकड़ा किसी स्वतंत्र स्रोत से आता है, उसे उसी रूप में उद्धृत किया जाता है; जहां यह निर्माता की आंतरिक स्वीकृति सीमा को दर्शाता है, उसे स्पष्ट रूप से बताया गया है ताकि आप तदनुसार इसका मूल्यांकन कर सकें।
एज मैकेनिक्स (कटिंग एज की भौतिकी)
Shear blade clearance decides how a cut fails, and that failure is what produces either a clean edge or a burr. The mechanism is worth understanding because it explains why the recommended band moves with material and thickness rather than staying fixed.
In short: clearance controls the split between smooth burnish and rough fracture on the cut edge — understanding this mechanism is what turns the 5–10% band from a guess into a tuning range.
Burnish and fracture zones
A sheared edge is not one surface. It is four zones stacked through the material thickness: rollover, where the blade first contacts and plastically deforms the sheet into a rounded, bent region; the burnish or shear zone, a smooth band formed while the blade compresses and rubs the material; the fracture or rupture zone, a rougher angled region where the crack propagates; and the burr, thin elongated metal pushed out at the exit edge (ispatguru, 2019; एएचएसएस दिशानिर्देश, 2021).
Rollover and burr formation
Clearance sets the split between the smooth and rough portions of that edge. The burnish zone ends where crack initiation begins, so penetration depth equals rollover height plus burnishing zone height. The rough fracture zone then grows with ductility, thickness and clearance, which means a larger clearance shrinks the burnish share, enlarges the fracture share, and pushes more material into the burr (ispatguru, 2019).
Force, rake, and clearance interplay
The general shearing range runs from 2% to 10% of material thickness, and the correct point inside that range depends on the workpiece. Harder materials and greater thickness need larger clearance. Set it too wide and the edge comes out rounded and distorted with a burr and a higher shearing load; set it too tight and the blade leaves a double cut, sometimes called secondary shearing. Ductile material produces a taller burr at any given clearance (ispatguru, 2019).
That is the mechanism behind the band. The next section turns it into numbers.
5-10% का नियम
The 5–10 percent rule says the shear blade clearance should sit between 5% and 10% of the metal thickness you are cutting. That band is the starting point for mild steels, not a universal setting, and the एएचएसएस दिशानिर्देश note that published recommendations place mild-steel die clearance at 5% to 10% of metal thickness. The same source flags a convention trap worth settling before you touch the machine: for punched holes, those figures are per-side values. Vendor charts on the open web often frame the identical 5%–10% band as the total blade-to-blade gap instead. Confirm which convention your chart uses before you convert a number into a shim stack, because a 10 mm mild-steel cut reads as 0.5–1.0 mm per side under one reading and 0.5–1.0 mm total under the other.
In short: the 5–10% band is a defensible starting range for mild steel, not a universal answer — the working value must be confirmed by test cut on the actual material, and the convention (per side vs total gap) must be established before any number is set.
Material-based bands
The band widens as the material gets stronger. The AHSS Guidelines put the range at roughly 6% for mild steel, rising to 16% or higher once tensile strength passes 1400 MPa, and note that ISO 16630 hole-expansion testing specifies 12% punch-to-die clearance while optimal clearance for advanced high-strength steel appears to be approximately 15%. Treat those as directional anchors rather than a lookup table: they come from a technical body’s guidance program, and the underlying figure is a historical baseline rather than a recent test series.
For AHSS and UHSS applications where standard D2 blades are reaching their clearance and wear limits, see the AHSS लाइनों के लिए टंगस्टन कार्बाइड इनलेड शियर ब्लेड्स ROI गाइड पूर्ण TCO तुलना के लिए।.
When to deviate
Deviate upward when the material work-hardens or when edge quality matters more than tool life. Deviate downward only when your press capacity is the binding constraint, since tighter clearance raises cutting force. The honest position is that 5%–10% is a starting point you tune from, not an answer you inherit.
Parallelism and thickness effects
Clearance is only as good as its consistency along the blade. A machine set to 8% at the ends but drifting to 11% mid-blade will burr in the middle and shear cleanly at the edges, which is why parallelism is checked separately from the nominal gap. Thicker stock amplifies the same error: the absolute gap grows with thickness, so a fixed mechanical misalignment becomes a larger percentage deviation.
सेटअप SOP (मानक संचालन प्रक्रिया)
A repeatable shear blade clearance setup follows one sequence: baseline the gap, verify parallelism, lock, test cut, iterate. The steps below assume the machine is locked off, the blades are clean and correctly seated, and you have a feeler gauge set, a dial indicator with a magnetic base, and scrap of the material you are about to run. Budget 30 to 45 minutes for a first setup on a machine you do not know well.
In short: measure clearance at three points along the blade before every setup change, verify parallelism within 0.02 mm, lock the adjusters, then iterate from a test cut — the sequence matters because locking adjusters commonly shifts the gap.
Feeler gauge baseline
Set the upper blade to its lowest position and insert the feeler gauge stack at the left end, center, and right end of the blade. Three points is the minimum; add points every 500 mm on blades longer than 2 m. Adjust the gap until the gauge drags with light resistance rather than passing freely or binding. Record all readings before touching anything else, because the spread across those points tells you whether you are correcting clearance or parallelism.
Dial indicator calibration
Mount the dial indicator on the lower blade and sweep the upper blade through its stroke, recording readings at several positions along the length. Blades should sit within 0.02 मिमी of each other, and the gap needs immediate recalibration once it exceeds that. Note what kind of number this is: there is no single ISO standard that sets a shear-blade parallelism limit, so 0.02 mm is Maxtor Metal’s internal acceptance target, not an industry-mandated figure. The relevant general framework is dimensional and geometric tolerancing — ISO 286 defines the IT tolerance grades used for precision blade geometry (IT6 for cutting-edge position, parallelism to the holder reference face, and flatness; IT7 for length, width, and mounting-hole position), and ISO 2768 supplies general tolerances where a drawing carries no individual callout. Treat the 0.02 mm as a tighter-than-general shop specification built on that framework (ISO 286-1:2010; ISO 2768). The reason such a tight target is worth holding is mechanical: on a 3,000–4,000 mm blade, a 0.1–0.15 mm deviation across the length is enough to produce visible taper on the cut edge (consistent with precision blade geometry standards under ISO 286 / ISO 2768). Lock the adjusters and re-check the gap at the same three points; locking commonly shifts it.
Test cut and iteration
Run a slow test cut on scrap and read the edge. Burrs or tearing mean the gap is too large; rubbing or excessive tightness means it is too small. Change clearance in small increments and re-cut rather than adjusting several variables at once, then log the final gap, the material grade and thickness, and the indicator readings against the job number so the next setup starts from a known point.
Each regrind removes material from the blade thickness. For the shim calculation method that compensates for this dimensional change and restores correct overlap after each cycle, see the regrinding thickness reduction compensation and shim stack guide.
Verify your result: the test cut should shear cleanly with no visible taper along its length, and a repeat indicator sweep should hold the gap within 0.02 mm after the adjusters are locked.
फील्ड केस: 6 मिमी S355 पर अत्यधिक गड़द (Burr) को ठीक करना
The clearest way to see why 5–10% is a starting rule and not a fixed answer is to walk through a commissioning-style troubleshooting case. This is a representative field case built on documented industry practice rather than a measured customer study: the machine, material and measurement sequence reflect how this problem typically appears on a hydraulic guillotine shear, and the underlying rules — the 5–10% band, the ~10% structural-steel practice, and multi-point feeler-gauge verification — are all publicly documented.
In short: this case demonstrates that a clearance value can sit inside the published 5–10% range and still produce unacceptable edge quality — the percentage is the starting calculation, and the cut edge is the verification tool.
The situation
| पैरामीटर | कीमत |
|---|---|
| आवेदन | Hydraulic guillotine shear |
| सामग्री | S355 structural steel |
| Nominal thickness | 6.0 mm |
| Measured thickness | 5.94–6.06 mm across the test sheets |
| ब्लेड | Hardened cold-work tool-steel shear blades |
| Initial clearance | ~0.30 mm |
| Target window | ~0.30–0.60 mm (5–10% starting rule) |
The problem appeared after the machine was switched from thinner sheet to 6 mm structural steel. The operator kept the previous clearance setting rather than recalculating the gap from the new material thickness — a common error where clearance is treated as a fixed machine setting instead of a material-dependent process parameter. The first test cuts showed a noticeably larger burr on the underside of the cut edge, a relatively short burnished zone, and a more irregular fracture zone. The operator suspected dull blades and considered replacing them.
Attempt 1 — replace the blades (rejected)
The first response was to suspect blade wear. Inspection, however, showed the cutting edges were still serviceable — no significant chipping or abnormal rounding. Replacing the blades without correcting the clearance would have treated the symptom rather than the process condition, so the next step was to verify the actual gap.
Measurement sequence
The machine was stopped and isolated per the site’s maintenance procedure. Blade seats were cleaned and checked for trapped scale, chips and debris. Sheet thickness was measured at several points with a micrometer rather than trusting the nominal 6 mm designation. Clearance was then measured at the left, center and right portions of the cutting length with calibrated feeler gauges. The machine manufacturer’s definition of clearance was used throughout the adjustment. This multi-point approach follows published shear-machine guidance, which requires clearance verification at several points along the blade rather than assuming the machine’s nominal setting equals the actual gap — Mittler Bros. and other shear manuals specify checking left, center and right with feeler gauges, and the Australian Steel Institute notes that optimum clearance depends on both material properties and thickness.
Attempt 2 — keep the 5% setting (insufficient)
After measurement, the initial gap was approximately 0.30 mm — about 5% of the measured 6 mm thickness:
6.0 mm × 5% = 0.30 mm
That value was technically inside the general 5–10% starting range, yet edge quality remained unsatisfactory. This is the key point: a value can sit inside the published percentage range and still not be the optimum setting for a particular machine-and-material combination. Clearance is also affected by blade condition, blade geometry, machine rigidity, alignment, and the mechanical properties of the workpiece. Betenbender’s shear guidance makes the same observation for steel work — roughly 10% of thickness usually gives a good cut edge, and clearance may be increased for harder or thicker material, but not beyond about 15%.
Attempt 3 — increase clearance (resolved)
Clearance was increased progressively toward approximately 0.50–0.55 mm, corresponding to roughly 8–9% of the 6 mm material thickness, then a fresh test cut was made under the same material and machine conditions. Edge quality improved visibly. The important caveat: this is not a claim that 0.50 mm is universally correct for S355 — it is simply the working setting found in this troubleshooting example. Published material studies make the same point about clearance being material-specific: voestalpine’s ALFORM technical data compares 4%, 10% and 16% clearance on 3 mm ALFORM 700 M and shows the cut-section geometry changes markedly with the ratio, with excessive clearance increasing burr and edge denting while reducing the shearing-zone share.
Effect, recorded honestly
Rather than inventing precise burr-height numbers, a credible record notes the observable change:
| पैरामीटर | Initial condition | After adjustment |
|---|---|---|
| सामग्री | S355 | S355 |
| Nominal thickness | 6 मिमी | 6 मिमी |
| Measured thickness | 5.94–6.06 mm | 5.94–6.06 mm |
| निकासी | ~0.30 mm | ~0.50–0.55 mm |
| Clearance ratio | ~5% | ~8–9% |
| Blade condition | Serviceable | Same |
| Test batch | Same heat / comparable material | Same |
| बर्र | Pronounced / unacceptable | Visibly reduced |
| Cut edge | Irregular fracture zone | More uniform fracture |
| Blade change | Not required | Not required |
If a team wants to make this rigorous, the fields worth adding are burr height (mm), rollover height (mm), burnished-zone and fracture-zone percentages, cut-angle deviation, machine hydraulic pressure, number of strokes, and blade edge radius.
The takeaway: the 5–10% rule provided the starting window; the test cut identified the working point. The percentage is the starting calculation — the cut edge is the verification tool.
This chain is worth internalising: 5–10% rule → 6 mm S355 gives a 0.30–0.60 mm starting window → measurement shows 0.30 mm gives poor edge quality → step up to ~0.50–0.55 mm → test cut confirms the improvement → do not market 0.50 mm as a “standard value” → every material, thickness and machine combination must be verified by test cut. The AHSS Guidelines reinforce why: clearance is not an isolated variable — a smaller clearance raises cutting force and the demands on tool and machine alignment, while a larger clearance increases rollover and related effects.
QC और रखरखाव (Maintenance)
In short: set a numeric burr height limit before the job starts, log clearance and material lot per job, and treat rising burr height or an edge radius above 0.2 mm as mandatory regrind triggers — not subjective judgements.
Burr height limits and triggers
Burr height is the fastest field check on a shear, and it is the one most often left unmeasured. Set a numeric limit before the job starts, then treat any exceedance as a trigger rather than a nuisance.
A practical default is 5% of material thickness. On 3 mm mild steel that is 0.15 mm, measurable with a deburring gauge or a bench micrometer across the burr crest. Project drawings and customer acceptance criteria override the default whenever they are tighter.
Two triggers should stop the line:
- Burr height above tolerance on two consecutive cuts after a clearance check.
- Edge radius at or above 0.2 mm, measured on the blade bevel with a radius gauge or a 20× magnifier.
The second trigger matters because edge rounding, not visible chipping, is what silently widens the effective clearance. A blade that looks serviceable can already be cutting 0.05 mm wider per side than the setup sheet says. As with the parallelism target, the 0.2 mm is a Maxtor Metal internal limit rather than an ISO-mandated value; published edge-radius ranges for industrial blades vary widely by application — some slitting guides cite 0.05–0.30 mm, disc-shear references hold below 0.05 mm, and general deburring practice references edge-break specifications such as ISO 13715. That spread is exactly why you set the limit against your own acceptance criteria rather than assuming one number fits every line.
For a measurement-based rotation trigger and audit-ready log template that standardises this decision across an entire blade inventory, see the 4-एज रिवर्सिबल ब्लेड रोटेशन शेड्यूल और रीग्राइंड मानदंड SOP.
प्रो टिप: Log clearance, material lot, and burr height per job in one sheet. After a few weeks the log shows whether drift tracks a specific material lot, a specific operator, or the blade itself, which turns regrind scheduling from guesswork into a trend line.
Defect diagnosis and corrective actions
Match the defect to the cause before touching the blade. Most burr and edge complaints trace back to one of four conditions, and each has a different fix.
| दोष | संभावित कारण | सुधारात्मक कार्रवाई |
|---|---|---|
| Tall, rolled burr on one side | Clearance too wide on that side | Re-check parallelism, reduce gap toward the lower band |
| Short, brittle burr with edge chipping | Clearance too tight | Open the gap, inspect the bevel under 20× magnification |
| Burr varies along the cut length | Blade not parallel or ram misalignment | Re-shim and verify straightness before the next setup |
| Clean cut, sudden burr spike mid-run | Edge wear or chipping | Measure edge radius, then decide regrind or replace |
When chipping appears suddenly or in a consistent location along the blade, the defect pattern itself carries diagnostic information. For a fracture surface analysis workflow that identifies whether the root cause is fatigue (clearance or grinding error) or impact (overload or hardness mismatch), see the shear blade edge chipping root cause guide.
That last decision follows a chipping-depth ladder. Light chipping under 0.2 mm clears with standard stock removal of 0.25–0.35 mm. Moderate chipping between 0.2 mm and 0.5 mm needs deeper removal and a 20× inspection of the bevel. Severe chipping above 0.5 mm means scrap or a major removal that can push the blade past its dimensional safety limit. The floor on any regrind is 0.254–0.381 mm of stock removal, because micro-fractures from running a blade past its sharpening window penetrate 0.25–0.40 mm below the bevel and will surface again if that layer is left in place (Maxtor Metal regrind-or-replace criteria for shear blades, retrieved 2026-08-27).
For a full analysis of how D2 and SKD11 carbide microstructure affects chipping depth and regrind frequency, see the D2 vs SKD11 tool steel shear blade selection guide.
Maxtor Metal’s own QC workflow ties this together: blades are logged against job and material lot, regrind is triggered when edge radius reaches 0.2 mm or burr height exceeds project tolerance, and every returned blade is re-verified for straightness under 0.02 mm/m, parallelism under 0.015 mm, and hardness across the full length before it goes back into rotation. These too are internal acceptance limits, set tighter than the general ISO 2768 / ISO 286 framework rather than drawn from a single published shear-blade standard. The point of the record is not the paperwork. It is knowing which of your four-edge reversible blades still has usable edges and which one is one bad cut away from a scrap decision.
FAQs:
प्रश्न: शीयर ब्लेड क्लीयरेंस के लिए 5-10 प्रतिशत का नियम क्या है?
उत्तर: यह सामग्री की मोटाई के 5% से 10% पर शीयर ब्लेड क्लीयरेंस सेट करता है। 10 मिमी माइल्ड स्टील के लिए यह 0.5–1.0 मिमी है। तन्य शक्ति (tensile strength) बढ़ने के साथ यह दायरा संकीर्ण हो जाता है: नरम एल्यूमीनियम शीर्ष के करीब बैठता है, स्टेनलेस और HSLA नीचे के करीब। इसे एक शुरुआती बिंदु के रूप में मानें और वास्तविक हीट पर टेस्ट कट के साथ इसकी पुष्टि करें।
प्रश्न: क्या शीयर ब्लेड क्लीयरेंस प्रति-तरफ है या कुल?
उत्तर: प्रकाशित चार्ट में दोनों परंपराएं दिखाई देती हैं, और उन्हें मिलाने से आपका क्लीयरेंस दोगुना हो जाता है। Maxtor Metal अपने अनुशंसित 5–10% को प्रति-तरफ ब्लेड क्लीयरेंस के रूप में निर्दिष्ट करता है, इसलिए 10 मिमी माइल्ड स्टील के कट के लिए प्रति-तरफ 0.5–1.0 मिमी या कुल 1–2 मिमी का उपयोग होता है। कुछ भी सेट करने से पहले जांच लें कि आपके मशीन निर्माता ने किस परंपरा का उपयोग किया है।
प्रश्न: 6 मिमी माइल्ड स्टील के लिए मुझे क्या क्लीयरेंस सेट करना चाहिए?
उत्तर: 0.3–0.6 मिमी से शुरू करें और कटे हुए किनारे से पुष्टि करें। हल्की पॉलिश बैंड के साथ एक साफ, चौकोर किनारा बताता है कि आप सही मान के करीब हैं; भारी रोलओवर या असमान गड़द (burr) का मतलब है कि गैप बहुत चौड़ा है। आंख से न्याय करने के बजाय गड़द को मापें।
प्रश्न: क्या मैं स्टेनलेस और माइल्ड स्टील के लिए समान क्लीयरेंस का उपयोग कर सकता हूँ?
आर: नहीं। स्टेनलेस, HSLA और अन्य उच्च-शक्ति वाले ग्रेडों को एक संकीर्ण गैप (tighter gap) की आवश्यकता होती है, जो आम तौर पर सीमा के निचले छोर की ओर होता है, क्योंकि वे प्लास्टिक प्रवाह का विरोध करते हैं और पहले टूट जाते हैं। स्टेनलेस पर माइल्ड स्टील के क्लीयरेंस को चलाने से किनारे में दरार (edge cracking) और तेजी से ब्लेड घिसती है।
प्रश्न: मुझे शीयर ब्लेड को कितनी बार रीग्राइंड (पुनः धार) करना चाहिए?
उत्तर: गड़द (Burr) की ऊंचाई व्यावहारिक ट्रिगर है: सामान्य अभ्यास धातु की मोटाई के 10% से कम गड़द ऊंचाई का लक्ष्य रखता है, और बढ़ती हुई गड़द ऊंचाई टूल के घिसने और क्लीयरेंस बढ़ने दोनों को ट्रैक करती है (AHSS दिशानिर्देश)। AHSS के लिए, अकेली गड़द ऊंचाई एक कमजोर संकेत है, इसलिए कटा हुआ किनारा (cut edge quality) बेहतर संकेतक है। Maxtor Metal का अपना वर्कफ़्लो 0.2 मिमी के एज रेडियस या प्रोजेक्ट सहिष्णुता (tolerance) से अधिक गड़द ऊंचाई का उपयोग करता है, जो भी पहले आए।
प्रश्न: मैं शीयर ब्लेड की समानांतरता (parallelism) की जांच कैसे करूं?
उत्तर: मशीन को लॉक करके, चुंबकीय बेस पर एक डायल इंडिकेटर का उपयोग करें और पूरे ब्लेड की लंबाई को पार करें। Maxtor Metal निर्माण के समय 0.02 मिमी/मीटर से कम सीधेपन (straightness) और 0.015 मिमी से कम समानांतरता को सत्यापित करता है - ये सामान्य ISO 2768 / ISO 286 सहिष्णुता ढांचे पर बने आंतरिक स्वीकृति सीमाएं हैं, इसलिए वे सेवा में मौजूद मशीन के लिए एक समझदार बेंचमार्क हैं, न कि ऐसा नंबर जिसकी हर मानक को आवश्यकता हो। किसी भी रीग्राइंड या ब्लेड बदलने के बाद दोबारा जांच करें।
प्रश्न: मेरा शीयर डबल कट क्यों छोड़ता है?
उत्तर: एक डबल कट का आमतौर पर मतलब होता है कि मोटाई के लिए गैप बहुत चौड़ा है, इसलिए सामग्री गैप में झुक जाती है और एक बार के बजाय दो बार टूटती है। यह अपर्याप्त होल्ड-डाउन बल (hold-down force) या एक ऐसे ब्लेड से भी आ सकता है जिसने अपनी धार खो दी है। ब्लेड को दोष देने से पहले क्लीयरेंस को बैंड के निचले छोर की ओर कसें और होल्ड-डाउन दबाव की जांच करें।
निष्कर्ष
शीयर ब्लेड क्लीयरेंस एक सेटअप निर्णय है, कोई निश्चित संख्या नहीं, और 5-10% नियम आपको एक सार्वभौमिक उत्तर के बजाय एक रक्षात्मक शुरुआती बिंदु देता है। यह बैंड एक साथ दो चीजों को नियंत्रित करता है: किनारे पर कितना पॉलिश और फ्रैक्चर ज़ोन दिखाई देता है, और कटौती के बाद कितना रोलओवर और गड़द (burr) पीछे छूट जाता है। इसे सही करें और कटा हुआ चेहरा साफ रहता है; इसके बाहर भटकते हैं तो आप एक दोष को दूसरे से बदल देते हैं।
एक नियंत्रित प्रक्रिया को भाग्य पर आधारित प्रक्रिया से जो अलग करता है, वह है मानकीकरण (standardisation)। प्रत्येक जॉब के लिए आपके द्वारा सेट किए गए क्लीयरेंस को लॉग करें, उस सामग्री के ग्रेड और मोटाई को रिकॉर्ड करें जिसके लिए इसे सेट किया गया था, और गड़द की शिकायत का इंतजार करने के बजाय एक निश्चित अंतराल पर किनारे की स्थिति की जांच करें। उन लॉग के विरुद्ध रीग्राइंड चक्रों को ट्रैक करें ताकि आप विफलता से पहले किनारे के घिसने को देख सकें। इसे ब्लेड के प्रश्न के साथ-साथ वर्कफ़्लो के प्रश्न के रूप में भी मानें: यदि कोई इसे लिखता नहीं है, तो समान क्लीयरेंस मान अलग-अलग शिफ्टों में अलग-अलग व्यवहार करता है।
यदि आप एक नया शीयर सेट कर रहे हैं या किसी मौजूदा को मानकीकृत (standardize) कर रहे हैं, तो किसी संख्या को तय करने से पहले अपने सामग्री मिश्रण (material mix) और ड्यूटी चक्र (duty cycle) के खिलाफ ब्लेड विनिर्देश की समीक्षा करें। जब सामग्री या अनुप्रयोग सामान्य बैंड से बाहर हो, तो एक एप्लिकेशन इंजीनियर से बात करें कि आपकी प्रक्रिया को कहां और क्यों विचलन (deviate) करना चाहिए।
For the full Maxtor Metal shear blade range — material grades, dimensional tolerances, and regrind service options — see the precision shear blade product page.
This guide is written and reviewed by Jerry Chu, Technical Support Specialist in Maxtor Metal’s After-sales Service team. Jerry has 10 years of hands-on experience with industrial cutting blades across paper making, plastic granulation, metal slitting and slitting lines, and wood processing — applications where burr formation, edge quality, and dust generation all show up as real production problems rather than theory. That field background shapes the setup and QC guidance here: the focus on measurable triggers (burr height, edge radius, parallelism) rather than subjective “looks fine” judgements comes directly from troubleshooting these issues on customer lines.
Jerry holds पीएमपी (Project Management Professional) and CMRP2 certifications, which support the process-discipline approach — logging, standardised setup, and scheduled inspection — that runs through this article.
Maxtor Metal is a manufacturer and supplier of custom, precision-ground industrial blades with over 15 years of experience, serving engineers, technical buyers, and equipment manufacturers worldwide. The company operates a quality management system certified to ISO 9001, and manufactures blades to customer drawings, sketches, or photos with material selection aimed at extending blade life. The internal tolerance and regrind figures quoted in this article come from that QC workflow.
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