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Help required regarding torque screwdriver calculation Sad
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Posted by: saurabhvyas

01/24/2005, 18:23:21

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hi all,

I will appreicate if somebody can help me on torque screwdriver calculation. I am putting torque of 100 inch oz on  my no . 6 (6-32)  screw using torque screw driver. I  am intrested in knowing what clamping or axial force i am putting on screw.

Saurabh







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Re: Help required regarding torque screwdriver calculation
Re: Help required regarding torque screwdriver calculation -- saurabhvyas Post Reply Top of thread Forum
Posted by: crbeebe

01/25/2005, 12:42:23

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Per Shigley,

T=K* Fi * d + Tr   (when nut is torqued)

T=1.2* K* Fi * d + Tr   (when bolt head is torqued--accounts for bolt twisting)

where, T=torque, Fi=bolt pre-load , d=nominal screw diameter, Tr= running torque (Tr is measured during installation)

K       Bolt Condition

0.30  Non-plated, dry 

0.20  Zinc-plated  

0.18  Lubed

0.16  Cadmium plated

0.12  Cu Anti-seize grease

0.20  Assumed if Condition is Unknown

It should be noted that there is usually very wide scatter using this method.  If you need to know preload accurately, use strain-gaged bolts (look for a vendor that does this), load indicating washers, ultrasonic bolt load determination (again, there are vendors who make this equipment), or other method.







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Re: Help required regarding torque screwdriver calculation
Re: Help required regarding torque screwdriver calculation -- saurabhvyas Post Reply Top of thread Forum
Posted by: Cragyon
Bart
01/24/2005, 21:03:42

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Check out he following page /calculators/torque_calc.htm it has a torque - force calculator on it.






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