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<strong>Sure</strong>-Grip ® <strong>Power</strong> <strong>Chuck</strong> Safety and Technical Manual B-87Z<br />
The <strong>Chuck</strong>ing Ratio = d Z ÷ d SP can be determined from your specific working conditions or obtained from the chart<br />
below.<br />
<strong>Chuck</strong>ing Ratio (d Z ÷ d SP) – Table 4<br />
<strong>Chuck</strong>ing Machining Diameter (Dz) mm/inch<br />
Diameter<br />
mm/inch 20 40 60 80 100 150 200 250 300 350 400 500<br />
(Dsp) .787" 1.574" 2.362" 3.149" 3.937" 5.905" 7.875" 9.843 11.811" 13.779 15.748" 19.985"<br />
20mm 1 2 3 4 - - - - - - - -<br />
0.787"<br />
40mm 0.5 1 1.5 2.0 2.5 3.8 - - - - - -<br />
1.574"<br />
60mm 0.33 0.67 1 1.3 1.7 2.5 3.3 4.2 - - - -<br />
2.362"<br />
80mm 0.25 0.5 0.75 1.0 1.3 1.9 2.5 3.1 3.8 4.4 - -<br />
3.149"<br />
100mm 0.2 0.4 0.6 0.8 1.0 1.5 2. 2.5 3.0 3.5 4.0<br />
3.937"<br />
150mm 0.13 0.27 0.4 0.53 0.67 1.0 1.3 1.7 2.0 2.3 2.7 3.3<br />
5.905"<br />
200mm - 0.2 0.3 0.4 0.5 0.75 1.0 1.3 1.5 1.8 2.0 2.5<br />
7.875"<br />
250mm - 0.16 0.25 0.32 0.4 0.6 0.8 1.0 1.2 1.4 1.6 2.0<br />
9.843"<br />
300mm - - 0.2 0.27 0.33 0.5 0.67 0.83 1.0 1.2 1.3 1.7<br />
11.811"<br />
350mm - - 0.17 0.23 0.29 0.43 0.57 0.72 0.88 1.0 1.1 1.4<br />
13.779"<br />
400mm - - - 0.2 0.25 0.38 0.5 0.62 0.75 0.87 1.0 1.3<br />
15.748"<br />
500mm - - - 0.16 0.2 0.3 0.4 0.5 0.6 0.7 0.8 1.0<br />
19.985"<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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