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Clausing 15" variable speed DP: troubleshooting speed adjustment

mobgrazer

Plastic
Joined
Apr 17, 2022
I recently acquired a 15" Clausing 1670 Variable speed drill press (1966) in pretty good shape ($450). I need some help troubleshooting the speed adjustment.

I can only access the top half of the speed range. if I try to go any slower the front pulley faces move too close together and push the belt off. My initial thought is that the belt on it is too wide or too long. Does this make sense? could it be anything else?

I did need to replace the variable control hand wheel bolt. Clausing charged $26 to ship a 1/2" bolt in an envelope, which makes me hesitate paying $100+ for a new belt I may not need. Thank you.
 

thermite

Diamond
I can only access the top half of the speed range. if I try to go any slower the front pulley faces move too close together and push the belt off. My initial thought is that the belt on it is too wide or too long. Does this make sense? could it be anything else?

No Clausing DP here, but three Reeves drives ... or clones, plus I've rebuilt several on printing presses, "back in the day".

Besides the speed control linkage, and making sure you are not running with a wrong belt subbed-in, check and see if the OTHER variable sheave is getting full range of travel to take-up... before that front one gets so close as to 'escape'.
 

CalG

Diamond
Joined
Dec 30, 2008
Location
Vt USA
I just measured the belt width on my Clausing 1765 VS. It's 7/8 inch. seems to work fine. Perhaps your model takes the same belt width.

It could be the belt is too long also. How does it ride at the other extreme?

I do need to "exercise" the drive regularly to keep it limbered up. But it's not thrown a belt on me.
 








 
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