Drill chuck replacement question

[Muggzy]

Hello All,
I've had a Home Master 5 speed 1/2 hp drill press that I got used years ago and for cheap. I'm finally getting to use it but the chuck is pretty beat.

I figured out that it was on a tapered spindle rather than a threaded one and got it off the spindle. The markings on the chuck are unreadable - maybe H-CHAU or H-C-AU? and the C might be an O.
I'm not sure where to begin. The chuck is 1/2 inch but I don't know anything about the taper. I should point out that the *spindle* has the tapered shaft. The chuck has a tapered hole. Any advise?





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[The Cobbler]

if it's a taper the quill will have a slot in the side to drive out the taper shank. otherwise it could be a LH thread

 

[Muggzy]

if it's a taper the quill will have a slot in the side to drive out the taper shank. otherwise it could be a LH thread

Thanks for the reply, I just clarified my op. The quill is a male tapered shaft (see added pic) there is no slot in the chuck as there would be in a more typical quill. I got the chuck off but is this even available?



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[woody 73]

If you have the chuck in your hands stop by any industrial store in your home town and they can find a replacement for you.

 

[Muggzy]

If you have the chuck in your hands stop by any industrial store in your home town and they can find a replacement for you.

Like Grainger or McMaster? Nearest one is 25 miles. Found this "taper mount" on Google but how do I know if the tapers match? :
http://bisjettools.com/561708-jet-t...m1Paq7VePmPFEoUCZycdVNEgZBOzElt4cgaAtzN8P8HAQ


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[woody 73]

See if this helps you out:

http://victornet.com/reference/Drill_Chuck_Mounting.html

 

[woody 73]

more information:

http://www.toolsandmods.com/library/morse-taper-dimensions

 

[lilredex]

Most those are JT-33. When you get it figured out, and decide on a keyless type go here:

http://www.cdcotools.com/ The JT-33 (#25013) is $25 ..........I have two of those in my shop and do they grip!!

 

[Murphy4570]

I second the guess of Jacobs Taper #33. That is a very common small taper used on homeowner light duty drill presses. My 1980's Wilton drill press has that taper. I found out after I tried to put a #2 taper chuck on it.

If you want to be certain, you can use a machinist's square and rule to measure the taper per inch, then look up a drill chuck taper chart online.

 

[Muggzy]

more information:

http://www.toolsandmods.com/library/morse-taper-dimensions

Wow, thanks! Based on the table on this page, it appears to be a B16 metric taper.

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[Muggzy]

Maybe not :-/ The numbers in the picture below appear to be close to B16. When I use those numbers I measured to calculate the taper, I get a number that seems too far off to match any of the tapers in the table?
0.62-0.567)/0.893 = 0.05939 taper

Am I doing something wrong?


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[larry_g]

JACOBS LARGE SMALL
TAPER# DIAMETER DIAMETER LENGTH
(A) (B) (C)
----------------------------------------
0 .250" .228 .438
1 .384 .333 .656
2 short .549 .488 .750
2 .559 .488 .875
3 .811 .746 1.219
4 1.124 1.037 1.656
5 1.413 1.316 1.875
6 .676 .624 1.000
33 .624 .561 1.000
----------------------------------------

It's also real close to a JT33

lg
no neat sig line

 

[woody 73]

JT33 looks real close.

 

[Muggzy]

Thanks for all the help guys. Yeah Larry_g's table looks like a jt33 is probably the one. So I went ahead and ordered one of Amazon. Should be here tomorrow. Will post up the results.

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