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<strong>Sure</strong>-Grip ® <strong>Power</strong> <strong>Chuck</strong> Safety and Technical Manual B-87Z<br />
Turning Example Calculation (continued)<br />
4. Find "Fsp Q" Initial Gripping Force (Formula 3): Fsp Q = S z x ( Fsp z + Fc )<br />
Total Gripping Force (lbs/N)<br />
Known: Fsp z = 12,077N Fsp Q = 2 x (12,077 + 3,111)<br />
Fc = 3,111N Fsp Q = 2 x (15,188)<br />
S z = 2 (length factor from table 5,<br />
should never be less than 1.5) Fsp Q = 30,376N (6834 lbs) Round Off<br />
5. Find the Draw Bar Force and pressure required for the actuating cylinder.<br />
Use the graph shown below (Gripping Force Operating <strong>Power</strong> Chart for the 6" <strong>Sure</strong>-Grip ® <strong>Chuck</strong>)<br />
Use the initial gripping force results from step 4 (Fsp Q = 30,376N) to find draw bar force and the<br />
actuating cylinder's pressure setting.<br />
Fsp Q =<br />
Known: Fsp Q = 30,376N (6834 lbs)<br />
Operating Pressure<br />
14000<br />
62,272N<br />
13000<br />
57,824N<br />
12000<br />
53,376N<br />
11000<br />
48,928N<br />
10000<br />
44,480N<br />
9000<br />
40,032N<br />
8000<br />
35,584N<br />
7000<br />
31,143N<br />
6000<br />
26,688N<br />
5000<br />
22,240N<br />
4000<br />
17,792N<br />
3000<br />
13,344N<br />
2000<br />
8896N<br />
1000<br />
4448N<br />
0<br />
500<br />
2224N<br />
Total Gripping Force – Draw Bar Force – Operating Pressure<br />
6" <strong>Sure</strong>-Grip <strong>Chuck</strong><br />
6834 lbs<br />
(30376N)<br />
1000<br />
4448N<br />
Draw Bar Force = 10,444N (2350 lbs) Round Off<br />
Actuating Cylinder's pressure = 190 psi<br />
1500<br />
6672N<br />
2000<br />
8896N<br />
2500<br />
11,120N<br />
Hardinge Inc. One Hardinge Drive, Elmira, New York U.S.A. 14902-1507 800.843.8801 www.hardingetooling.com<br />
115<br />
2350 lbs.<br />
3000<br />
13,344N<br />
3500<br />
15,568N<br />
4000<br />
17,792N<br />
4500<br />
20,016N<br />
Draw Bar Force (lbs/N)<br />
PSI<br />
Generic Lathe #1 100 150 200 300 250 300<br />
PSI<br />
Generic Lathe #2<br />
40 50 60 70 80 90<br />
PSI<br />
Generic Lathe #3<br />
PSI<br />
50 60 70<br />
Unlisted Lathe (Find pressures and draw bar forces from machine tool manuals and transcribe to this line)<br />
NOTE: All Charts are based on calculated draw forces.<br />
5000<br />
22,240N
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