|Forum topic by William Shelley||posted 06-16-2014 07:23 AM||1312 views||0 times favorited||13 replies|
06-16-2014 07:23 AM
I was doing some tuning to my drill press that I got last month on craigslist. It’s an ‘80s taiwan-made model by ‘Foremost Machinery’. The person I bought it from had used it exclusively for metalworking, I think. It’s a 16-speed model and he had it set at the slowest speed.
When I went to adjust the speed, I found that the pulleys were on incredibly tight and the motor could not be retracted to relieve tension… something was amiss. At the slow speed (and with a ton of tension on the pulleys), the drill press was fairly quiet and ran pretty true, slight bit of runout at the tip of bits but not too bad.
Well, I REALLY needed to change the speed and I figured that the belts may have been replaced at some point with ones that were too short so I figured I should at least get the belts off so that I could figure out what size to replace with and such. I stuck a putty knife at an angle between the belt and the pulley and rotated the pulley by hand which proved to be successful in levering the overly-tight belt off the pulley. With both belts off, I noticed that one was marked 28cm and the other was marked 27cm.
On a whim, I swapped the location of the belts (AB pulley went to BC and BC pulley went to AB). Voila, the tension problem was resolved, but after getting the speed set to where I wanted and turning the press on, I noticed that there was now a ‘grinding’ noise coming from the spindle.
I recorded a video and I think it does a good job of capturing the symptoms. I noticed that the noise diminished or ceased when I was applying a fair amount of pressure using a larger bit.
I have not owned a drill press other than this one and a cheap Ryobi benchtop model. I don’t have much to compare this experience to. Should I be looking at replacing bearings or is the noise normal?
EDIT: I would say that there is close to zero runout, and this press has a 1HP TEFC induction motor… did i get a good deal at $200 for this?
-- Woodworking from an engineer's perspective