Rockwell 20" Drill Press bearing replacement


Iggy's thread about his new drill press reminded me that I need help
in removing the step pulley on the drill press in order to replace the
two bearings that it rides on. It's fairly quiet when the quill is
retracted, but becomes increasingly noisy as the quill is lowered. It
sounds like its coming from the area of the pulley rather than inside
the casting. I'm assuming it's a bearing. I suppose it could be
something wrong with the splines on the spindle, although I doubt it -
there's no slop in the splines when I twist the spindle.
There's a cap containing the upper bearing on top that can be pried
off after removing the three bolts that hold it in place. I started
to remove that, then chickened out and decided to post here before I
broke something. That bearing cap is pretty tight. First question:
Is there an easy way to remove that bearing cap?
Second. Once that cap's removed, how do you remove the step pulley
from the lower bearing without breaking the pulley or something else?
I assume the pulley's going to be sitting on its lower bearing pretty
tightly since the upper one seems tight. That upper arm is in the
way, so it looks like it would be difficult to put some sort of puller
over the pulley.
Here's a photo of my machine I uploaded to the drop box.
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's a 20" Model 20-400, and parts-wise is similar to the Delta 20-4xx
series (i.e. 20-421, 20-425, among others)
The parts breakdown for this machine is here
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a small jpg of the first page if you're on dial up
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RWL
Reply to
GeoLane at PTD dot NET
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Gunner, anybody not arguing politics? Anybody ever taken the upper half of a Rockwell / Delta drill press apart?
RWL .......................................
Reply to
GeoLane at PTD dot NET
I overhauled my 17 inch delta - there is a supplier on the web that has most of the exploded parts lists on line - search for your drill press by model number and find the parts list, that will help you a lot. On mine under the cap was a nut and a locking tab-washer, remove those and the spindle could be separated from the pulley - then pull the quill out the bottom (after removing the gear and spring) - photo of my drill press is on my web page (wbnoble.com) - I still have some castings and stuff left for the older z-head DP-60 if anyone needs them
Reply to
Bill Noble
Bill, thanks for your reply, but my drill press is different than yours. I have a link to my parts breakdown in my original message below so you can see what I'm dealing with. The obstacle on my press is an overarm that sits over the pulley. The pulley is supported both top and bottom. I'm pretty sure I could get the top bearing cap off, but I'm wondering how tight the pulley sits on the bottom bearing, and how you get the pulley up and off without breaking it. Sorry to all for top posting.
RWL
Reply to
GeoLane at PTD dot NET
actually, that is a lot like mine - it looks the same except for a little bigger stuff (mine is a 17 inch) - it's been a year or two - but pull the top cap off, and as I recall the quill comes out the bottom and you just slide the pulley aside. My drill prss has the same over arm - it's really the same design - when I took apart four of the DP-10 units, there was no problem getting the top pulley out of any of them - nothing required any particular force.
Reply to
Bill Noble
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Thanks Bill. I went back and looked again at the parts breakdown linked at your web site under the Hobbies > Tools section:
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diagram is sideways and a little fuzzy, so I initially thought I was looking at an extension to the left side of the head casting rather than an overarm. Not sure that I'll get to it this weekend but that gives me the confidence to fully remove the top cap and continue on.
RWL
Reply to
GeoLane at PTD dot NET

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