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<strong>Sure</strong>-Grip ® <strong>Power</strong> <strong>Chuck</strong> Safety and Technical Manual B-87Z<br />
Main Cutting Force<br />
The Main Cutting Force "Fs" is calculated from the feedrate, the depth of cut and the material being machined.<br />
Formula #2 Fs = (Sr x t) x Kc<br />
Where: Sr = Feedrate in mm per revolution<br />
t = Depth of cut in mm<br />
Kc = Specific cutting force in N/mm2 – See table on next page<br />
The product (Sr x t) chip cross section can be obtained from the table below.<br />
The specific cutting force "Kc" as a function of feed can be obtained from the table on the next page.<br />
Fs = Cutting force on turning style cutting tools<br />
Fp = Radial force – passive<br />
Fv = Feed force on turning style cutting tools<br />
Fsp Z = Required total gripping force<br />
(without considering the effects of angular speed)<br />
Fc = Centrifugal force of the jaws<br />
Fsp Q = Total initial gripping force with stationary chuck<br />
Lz = Distance between machining and clamping points<br />
d SP = <strong>Chuck</strong> diameter<br />
d Z = Machining diameter<br />
Lsp = <strong>Chuck</strong>ing length<br />
Factors in Calculating Gripping Force<br />
The following information tables will help you when making gripping force calculations and determine safe operating factors.<br />
Chip Cross Section (Feed Rate x Depth of Cut) – Table 1<br />
Feed Rate (Sr) (t) D epth of Cut<br />
mm/Inches 2mm 3mm 4mm 5mm 6mm 7mm 8mm 9mm 10mm 12mm<br />
Per Rev. .078" .118" .157" .196" .236" .275" .315" .354" .3937" .472"<br />
0.16mm<br />
0.0063"<br />
0.32mm 0.48mm 0.64mm 0.8mm 0.96mm 1.12mm 1.28mm 1.44mm 1.6mm 1.92mm<br />
0.20mm<br />
0.0079"<br />
0.4mm 0.6mm 0.8mm 1.0mm 1.2mm 1.4mm 1.6mm 1.8mm 2.0mm 2.4mm<br />
0.25mm<br />
0.0098"<br />
0.5mm 0.75mm 1.0mm 1.25mm 1.5mm 1.75mm 2mm 2.25mm 2.5mm 3.0mm<br />
0.32mm<br />
0.0126"<br />
0.64mm 0.96mm 1.28mm 1.6mm 1.92mm 2.24mm 2.56mm 2.88mm 3.2mm 3.84mm<br />
0.40mm<br />
0.0157"<br />
0.8mm 1.2mm 1.6mm 2.0mm 2.4mm 2.8mm 3.2mm 3.6mm 4.0mm 4.8mm<br />
0.50mm<br />
0.0197"<br />
1.0mm 1.5mm 2.0mm 2.5mm 3.0mm 3.5mm 4.0mm 4.5mm 5.0mm 6.0mm<br />
0.63mm<br />
0.0248"<br />
1.26mm 1.89mm 2.52mm 3.15mm 3.78mm 4.41mm 5.04mm 5.67mm 6.3mm 7.56mm<br />
0.80mm<br />
0.0315"<br />
1.6mm 2.4mm 3.2mm 4.0mm 4.8mm 5.6mm 6.4mm 7.2mm 8.0mm 9.6mm<br />
1.00mm<br />
0.0394"<br />
2.0mm 3.0mm 4.0mm 5.0mm 6.0mm 7.0mm 8.0mm 9.0mm 10.0mm 12.0mm<br />
1.25mm<br />
0.0492"<br />
2.5mm 3.75mm 5.0mm 6.25mm 7.5mm 8.75mm 10.0mm 11.25mm 12.5mm 15.0mm<br />
1.60mm<br />
0.0630"<br />
3.2mm 4.8mm 6.4mm 8.0mm 9.6mm 11.2mm 12.8mm 14.4mm 16.0mm 19.2mm<br />
Hardinge Inc. One Hardinge Drive, Elmira, New York U.S.A. 14902-1507 800.843.8801 www.hardingetooling.com<br />
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