Need Help!- 1994 4020HT Drawbar force???

[mniadna]

I am in the middle of replacing my belleville springs and have found conflicting prints regarding the amount of springs that my machine requires. It has a 10k spindle with a locking drawbar. The spring pocket is 4.25" deep. My manual has a print that shows 42 springs, and another that shows 43. I put 42 springs in and I get 1175 lbs. When I put 43 springs in I get 1725 lbs. Does anyone know without a doubt how many springs are supposed to be in this pig, or what the drawbar force is supposed to be?

Thanks,

[denmar]

42 wahers; first one at botton face down, top one face up.

[Neal]

Locking drawbar sould be 1650 to 2000 psi. Non-locking drawbar should be 700 to 1000 psi.

Neal

[mniadna]

Thanks,
I went with 43 springs. I'm right around 1700 LBS.

[scadvice]

Originally Posted by Neal Locking drawbar sould be 1650 to 2000 psi. Non-locking drawbar should be 700 to 1000 psi. Neal

Neal,
Please explain locking vs nonlocking?? This is new to me.
Thanks,
Steve

[Neal]

Steve--
The locking drawar will have a spider-like device at the top of the drawbar held on with 4 cap screws and containing ball bearings that lock in place thereby increasing the retention PSI.

Neal

[masterfabr]

Am I correct assuming that the locking drawbar is usually used/specified on machines that see/saw really heavy cuts?

[masterfabr]

Oh,just curious but, how is drawbar force measured?

[cadman]

With a drawbar force gage:

http://www.hhrobertsmachinery.com/Ac...namometer.html

[mniadna]

I have this one:
http://www.clamprite.com/

[scadvice]

Originally Posted by Neal Steve-- The locking drawar will have a spider-like device at the top of the drawbar held on with 4 cap screws and containing ball bearings that lock in place thereby increasing the retention PSI. Neal

Thanks Neal...
Steve

[trickeng]

Originally Posted by mniadna I have this one: http://www.clamprite.com/

Nice! $800 makes this purchase hurt so much less. Thanks for posting that link.