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Knurling Tools Technical Support

2 Call: 979-282-2861 Fax: 979-282-2951 Visit:www.doriantool.com E-mail:sales@doriantool.com Knurling Tools Technical Support

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Call: 979-282-2861 Fax: 979-282-2951 1Knurling Tools Technical SupportKnurl Application Knurl Tool Recommendation Knurl Application Knurl Tool Recommendation Diamond ShoulderlessBESTBETTERGOODStraight ShoulderlessBESTBETTERGOODSCNC-_1-2 SCNC-_7-DSCKN-_-DW-_ SCNC-_7-D107ST-_CMC-_5-OCNC-_1-2CNC-_7-R 3SHKT-_-CNC-_7-R107ST-_SWKT-_-_CNC-_2-RK T109-_-MRT CNC_4-MKT109-_-M CNC-_4-M CNC-_3-MKT109-_-OKT109-_-OSCKN-_-DW-_3WK T-_-_3SHKT-_-3WKT-_-_Diamond to a ShoulderBESTBETTERGOODStraight to a ShoulderBESTBETTERGOODSCNC-_6-2 KT109-_-4SCCK-_-DW-_KT109-_-4SCNC-_6-2FK T-_-_CNC-_6-4KT109-_-_3WKT-_-_CNC-_6-43W KT-_-_BandBESTBETTERGOODSmall Diameter and Long Diamond - Straight ShoulderlessBESTBETTERGOODSCNC-_7-D-SCKN -_-DW-_SFKT-_-_3WKT-_-_SCNC-_7-DSFKT-_-_ CNC-_7-R3SHKT-_-SWKT-_-_CNC-_7-RSWKT-_-_ KT109-_-MCNC-_4-M CNC-_5O-OSmall Diameter and Long Diamond - Straight to a ShoulderBESTBETTERGOODTaperBESTBETTERGOO D3WKT-_-_SpecialCrestBESTBETTERGOODInter nalBESTBETTERGOODSCNC-_7-DSCKN-_DW-_SFKT -_-_TIKT-_-CNC-_7-R3SHKT-_-SWKT-_-_KT109 -_-MCNC-_4-MCNC-_5O-OFace FrontBESTBETTERGOODMK MillingBESTBETTERGOODSpecialMMKT-_-_If your knurling application is not in the chart, please supply prints and Call: 979-282-2861 Fax: 979-282-2951 Tools Technical SupportFigure 1 - Full KnurlingCDKPKDAKDBKLREWLFigure 2 - Band KnurlingBKL1BKL2FEREKDAKDBKPCDWLFigure 3 - Shoulder KnurlingCDKPSDKDAKDBKLFEREWLFigure 4 - Crest KnurlingKDAKDBREWLKLFED1KPCDKnurl Wheel Identification Edge Prep Stgraight Diagonal Diagonal Diamond Diamond Full Beveled Knurl Right Left Male Female Face EdgeKnurl PitchoPTPITPI90TPI Is the number of teeth per inchCircular Pitch Is the distance between tooth to toothDiametral Pitch Is the number of teeth per inch of diameter Knurling Specificationx Check Knurling SpecificationSKP Straight Knurl DKPM Diamond Knurl MaleDKPR Diagonal Knurl Right DKPF Diamond Knurl FemaleDKPL Diagonal Knurl LeftFill Knurling DimensionKP Knurl Pitch Inch TPIAP % of Knurl Depth DP Metric P-mmDBK Diameter (Blank) Before Knurling FE Front End DistanceDAK Diameter After KnurlingRE Rear End DistanceKL Knurling LengthCD Chuck DistanceBKL1 Band Knurling Length 1SD Shoulder DiameterBKL2 Band Knurling Length 2D1 Shoulder DiameterWL Workpiece LengthKnurling Production Information Material Annealed Heat Treated Quantity Machine Manual CNC Swiss OtherToolholder Style Left Right Toolholder SizeKnurling Tool RecommendationCustomer Information FigureDorian Tool RecommendationDateItem UPC Price DeliveryCompanyKnurling ToolContactKnurling HeadE-mailKnurling WheelTelephoneKnurling Pin Call: 979-282-2861 Fax: 979-282-2951 3Knurling Tools Technical SupportFigure 5 - ID- Internal KnurlingTIDSIDSKLTKLFigure 6 - FK-Face KnurlingIDODTKLFigure 7 - TK-Taper KnurlingD D1Figure 8 - MK Milling KnurlingKWKnurling SpecificationFill Knurling DimensionID Inside Diameter OD Outside DiameterKTP Knurl PatternKP Knurl Pitch Inch TPI DP Metric P-mm Knurling SpecificationFill Knurling DimensionTID Thru Knurling Diameter SID Shoulder Knurling DiameterTKL Thru Knurling LengthSKL Shoulder Knurling LengthKPT Knurl PatternKP Knurl Pitch Inch TPI DP Metric P-mm Knurling SpecificationFill Knurling DimensionID Inside Diameter OD Outside DiameterKTP Knurl PatternKP Knurl Pitch Inch TPI DP Metric P-mm Knurling SpecificationFill Knurling DimensionKW Knurling Width KL Knurling LengthKTP Knurl PatternKP Knurl Pitch Inch TPI DP Metric P-mm Knurling Tool RecommendationCustomer Information FigureDorian Tool RecommendationDateItem UPC Price DeliveryCompanyKnurling ToolContactKnurling HeadE-mailKnurling WheelTelephoneKnurling PinKnurling Production InformationMaterial HardnessQuantityMachineToolholder Style Right Left Toolholder Size4 Call: 979-282-2861 Fax: 979-282-2951 Tools Technical SupportFor Best Knurling Performance- Before beginning Knurling process check - Diameter before knurl- Diameter after knurl- Knurl pitch- Workpiece to be Set wheels on center of workpiece- Use beveled edge wheels when form knurling- Use full face wheels when cut knurling- Always use coolant when knurling- The standard knurling depth, is 35% of knurl circular Ex. Knurling Depth of 20 TPI KnurlCircular Pitch of 20TPI is: Knurling Depth is: .050 x .035% =.0175 per sideMetric Ex. Knurling Depth of 2mm KnurlKnurling Depth is: 2mm x .035% =.7mm per side- If the knurl double tracks, knurl wheel is not deep enough in to workpiece, increase knurling depth- If the knurl crest rolls over, the knurl wheel is to deep in to the workpiece, decrease knurling depth- If the knurl is not tracking, workpiece diameter is not correct for full number of teeth, diameter must adjusted up or down by using a tracking In-Feed Knurling, when the knurl wheel enter into the workpiece radially. Once the knurl wheel has reached the depth, will take from 5 to 20 revolution to complete the knurling operation. The revolution changes for the same size with the workpiece material End-Feed Knurling, when the knurl wheel enter into the workpiece depth of the knurl wheel must be set before the wheel get in contact with the workpiece, the depth and pressure changes for the same size with the workpiece material Knurl Versus Cutting Knurl- In Forming Knurl, the knurl wheels axis are set parallel to the workpiece axis, and forced against workpiece displacing the material to form the knurl pattern - Large amount of pressure is required to displace the material that forms the knurl pattern, and pressure increase with workpiece diameter, pitch size and hardness - In a large workpiece diameter, large knurl pitch, and hard material, a multi knurling pass may be required to achieve the correct knurl pattern- For best performance and quality in Forming Knurl, when possible, a Straddle Knurling Tool is to used, the pressure is divided within the knurl wheels over the workpiece, and pressure against the spindle of the machine is total Use beveled edge wheel when knurl forming- Use full face Knurled wheel when knurl cutting, the knurl wheels axis are set on negative angle, the sharp edge will cut the knurl pattern into the workpiece - In cutting knurl, less pressure is required for the operation, higher speed and feed can be used, (use the same cutting date of High Speed or Cobalt turning tools)- Use full faced knurl wheel when knurl Forming Knurl Tool for: Use Cutting Knurl Tool for:- Small to medium workpiece diameter- To the shoulder knurling- To centerless workpiece- To band knurling application- W h e n h i g h s u r f a c e fi n i s h r e q u i r e d - Medium to large workpiece diameter- To shoulderless diameter knurling- To hard workpiece materials- To long knurling application with live center- For higher productivityKnurling Pitch Tracking FormulaStep Calculation Inch12345678910TPIDiameter of the part after knurlGrowth after Knurl based on pitchDiameter of the blank before knurlKnurl wheel diameter and pattern (Straight)Knurl wheel tracking valueNumber of teeth on the workpieceCorrectionSelect the full number of teeth on the work pieceKnurl wheel tracking valueNew starting diameter = number of teeth x tracking value 10 .038 .750 Knurling Pitch Tracking FormulaStep Calculation Metric12345678910Circular pitchDiameter of the part after knurlGrowth after knurl based on pitch Diameter of the blank before knurlKnurl wheel diameter and pattern (Straight)Knurl wheel tracking valueNumber of teeth on the workpieceCorrectionSelect the full number of teeth on the work pieceKnurl wheel tracking value New starting diameter = number of teeth x tracking value mm .97 mm .84 Knurling SolutionKnurling double tracking1) Knurl wheel not deep enough into the workpiece 2) The circumference of the workpiece blank is a not full multiple of the knurl pitch1) Increase the depth of the knurl wheel into the workpiece 2) Change the blank diameter +/- .005 (.127mm) or use the tracking formulaKnurling flacking or slivered1) Knurling a workpiece material with scaling or rough surface 2) Over-rolling the knurl wheel into the workpiece when in-feed knurling 3) Knurl Wheel too deep into the workpiece when end-feeding 1) Turn the scaling or the rough surface of workpiece into a smooth surface 2) When in-feed knurling, reduce the depth of the knurl wheel, or reduce the number of revolutions after the knurl wheel has reached knurling depth 3) When end-feeding, reduce the depth of the knurl wheelKnurl destruction1) Knurling a workpiece material with scaling or rough surface 2) Over-rolling the knurl wheel into the workpiece when in-feed knurling 3) Knurl Wheel too deep into the workpiece 4) Use of sharp full faced knurl wheel when knurl forming1) Reduce the depth of the knurl wheel2) Reduce the number of revolutions after the knurl wheel has reached knurling depth 3) Reduce feed and speed and improve coolant flow 4) Use beveled edge when form knurlingKnurl wheel poor life1) Knurling a workpiece material with scaling or rough surface 2) Over-rolling the knurl wheel into the workpiece when in-feed knurling3) Knurl Wheel too deep into the workpiece when end-feeding 4) Workpiece material too hard, or difficult to knurl (stainless steels and high temp alloys)5) Workpiece not running concentric 6) Knurl wheel not properly hardened7) Poor lubrication8) Not using the correct knurl wheel for the application9) Knurl wheel not beveled1) Turn the scaling or the rough surface of workpiece into a smooth surface 2) When in-feed knurling, reduce the depth of the knurl wheel, or reduce the number of revolutions after the knurl wheel has reached knurling depth 3) When end-feeding, reduce the depth of the knurl wheel 4 ) R e d u c e f e e d a n d s p e e d a n d i m p r o v e c o o l a n t fl o w 5) Turn workpiece concentric and into a smooth surface 6) Change the knurl wheel7) Improve coolant flow 8) Use beveled knurl wheel(s) when forming knurling; use full faced knurl wheel(s) for cutting knurling9) Use a beveled knurl wheelUneven depth of knurl1) Knurling a workpiece material with scaling or rough surface 2) Workpiece not running concentric1) Turn the scaling or the rough surface of workpiece into a smooth surface 2) Turn workpiece concentric and into a smooth surface Twisted knurl pattern1) Knurl wheel not deep enough into the workpiece 2) The circumference of the workpiece blank is not a full multiple of the knurl pitch1) Increase the depth of the knurl wheel 2) Change the blank diameter +/- .005 (.127mm) or use the tracking formulaKnurling is ordinarily performed at the same speeds used as cutting operations. Use the same SFM used for high speed and cobalt tool bits to calculate speeds and feeds. However, where spindle speeds can be reduced without loss of production, it is recommended that spindle speeds be lowered as much as possible to increase knurl life.

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