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 Post subject: Removing threaded collar on drill press spindle
PostPosted: Mar Thu 08, 2018 9:06 pm 
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Joined: Jan Thu 01, 1970 1:00 am
Posts: 1626
Location: Silver Spring MD, USA
Hi all -

I know there are a lot of mechanical guru/machinists here so I'm looking for some help.

I'm restoring a early 1950s Craftsman (King-Seeley) 15 inch drill press. Teardown has gone fine so far, but now I am stuck. I'm replacing all the bearings, including the spindle bearings. Problem is the lower one.

The lower bearing sits on top of the threaded collar that the chuck screws on to. Got the chuck off and the spindle out the quill with no problems. I want to press the lower bearing off the bottom of the spindle, but I can't figure out how to remove the threaded collar.

What I have is similar to this (not my image: this is a Delta but similar in terms of the threaded collar arrangement):

Image

The person who posted this image has arrows on the place I am having an issue with. His collar has a tapered pin. Mine has a pin, but it doesn't go through the spindle all the way - it goes halfway; there is no hole on the other side of the spindle. I can wiggle the collar a bit and it seems there is a hole in the spindle that the pin goes into, except, again, it doesn't pass all the way through the shaft. The exploded diagram in the manual just shows the spindle with the collar attached as the "spindle assembly."

So I don't know how to remove the pin and get the collar off. Do I drill it out and use a new pin? Or is it actually a screw? There is no head on it, but it *may* be threaded. If it is, I would think I could use a screw extractor and get it out.

Any advice is greatly appreciated.

Thanks
-Kevin

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 Post subject: Re: Removing threaded collar on drill press spindle
PostPosted: Mar Thu 08, 2018 9:33 pm 
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Joined: Jan Thu 01, 1970 1:00 am
Posts: 33188
Location: Maryland 20709, USA
That's a "taper pin". Very standard method of assembly for parts that don't need to come apart often.
They come in standard sizes.

The simplest way to remove a blind one is to freeze it (not the surrounding area), then pull it out
with pliers. It only takes very minimal shrinkage to break the taper seal.

They are re-usable if you don't damage the mating surfaces.

- Leigh

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 Post subject: Re: Removing threaded collar on drill press spindle
PostPosted: Mar Thu 08, 2018 10:27 pm 
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Joined: Jan Thu 01, 1970 1:00 am
Posts: 26722
Location: Detroit, MI USA
If the center of the spindle is hollow you may be able to use a long tapered punch to wedge it loose from inside.

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Experience is what you gain when the results aren't what you were expecting.


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 Post subject: Re: Removing threaded collar on drill press spindle
PostPosted: Mar Fri 09, 2018 1:24 am 
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Joined: Oct Thu 20, 2016 3:54 am
Posts: 175
Location: Missoula mt
If you had a drill press that worked you could drill a little hole on the other side of the tapered pin and punch it out....WA7OPY :P


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 Post subject: Re: Removing threaded collar on drill press spindle
PostPosted: Mar Fri 09, 2018 1:25 am 
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Joined: Mar Wed 16, 2011 10:44 pm
Posts: 755
Location: Peekskill, NY
It's possible the taper pin was put in blind. Very unusual but worth investigation.

Another issue is the pin may have been oversize, that it was pressed in place and then
the narrow end dressed off to the coller OD. In this case the idea is to inspect the
area around where the pin should exit the collar and see if you can find a faint outline
of the pin diameter.


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 Post subject: Re: Removing threaded collar on drill press spindle
PostPosted: Mar Fri 09, 2018 1:45 am 
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Joined: Sep Tue 30, 2014 6:08 am
Posts: 3033
Location: The Old Dominion VA 23518
A dye penetrant may reveal more - like the through hole, or the absence of such. Just a drop or two will do it.....

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 Post subject: Re: Removing threaded collar on drill press spindle
PostPosted: Mar Fri 09, 2018 2:23 am 
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Joined: Jan Thu 01, 1970 1:00 am
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Location: Beautiful Downtown Burbank CA
How about a shot of air straight in while wiggling, after penetration oil.


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 Post subject: Re: Removing threaded collar on drill press spindle
PostPosted: Mar Fri 09, 2018 3:22 am 
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Joined: Jan Thu 01, 1970 1:00 am
Posts: 1626
Location: Silver Spring MD, USA
All excellent ideas, thanks everyone. I'll investigate more tomorrow night and see what I can come up with.

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