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Drill press "slippage"

MTMike

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Hey guys,

My dad gave me his old drill press when he upgraded his last year. It's a circa 1989 off-brand table-top drill press. I was using it a while back drilling through some 3/16" plate and the bit would stop without hardly any pressure. I did some more playing with it and discovered that (while wearing gloves) I could grab the chuck and stop it with my hands with very little effort. I thought maybe it was the drive shaft slipping on the chuck, but ruled that out by removing the chuck and grabbing the driveshaft with the same results. So it seems like something internal that's slipping.

I tried tightening the adjustment screw on the outside, which I later discovered was the spring for the handle. I don't want to spend the time tearing it apart and trying to figure out what could be wrong without getting some input.

Thanks in advance!

Mike
 
adjust or change the belt.....

Sorry I forgot to mention - that was the first thing I tried was the belt. It is tight, and the pulley can't be stopped like the chuck. The slipping is somewhere between the belt pulley and the driveshaft.
 
that drive pulley is probably a press fit thats slipping.. run it with the top up and watch that pulley/shaft...
 
that drive pulley is probably a press fit thats slipping.. run it with the top up and watch that pulley/shaft...

Oh OK... that makes sense. Thanks for the info, I will check the pulley when I get back home and let you know.
 
The pulley should be keyed to the shaft and the key has probably sheered in half and now the pulley spins on the shaft. The only way to check is to remove the pulley (assuming it hasn't galled the shaft too bad).
 
I pulled the pulley off the driveshaft this morning and inspected it. I found that it has an allen screw pin that keeps the pulley positioned on the flat spot on the driveshaft, and apparently the allen screw had backed out. I reassembled it, and tightened the allen screw back down and it works like new!

Thanks for your help, guys!
 

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