Motor shaft mounted chuck

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Subject Author Date
Motor shaft mounted chuck Russ Meredith 04-13-2008
Posted by Russ Meredith on April 13, 2008, 12:22 am
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 I bought a used Fisher Scientific overhead lab mixer. The mixer motor
is a rebranded Bodine gear motor with a direct drive output shaft and
a gear reduced output shaft. The mixer came without a drill chuck.

Each shaft is .315 "inch (5/16") diameter by 1" L . I want to
mount a 3/8 or so drill chuck on the direct drive shaft without adding
too much length.

Originally these mixers were equipped with a shaft mounted chuck held
in place with setscrews.

I don't know what the chucks are called so my searches come up with
all kinds of taper mounts. Does anyone know what these chucks are
called and where I might buy one.

The chuck needsto be hobby grade.

Thanks in advance

Russ



Posted by Jim Wilkins on April 13, 2008, 6:47 am
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> ...Each shaft is .315 "inch (5/16") diameter =A0by =A0 1" L . =A0I want to=

> mount a 3/8 or so drill chuck on the direct drive shaft without adding
> too much length....
> The chuck needsto be hobby grade.
> Russ

I know what you mean but I haven't seen the chucks separately. Do you
have the equipment and ability to adapt a common 1/2-20 mount chuck
with an adapter made from a bolt?

Chuck a short bolt in a lathe and drill it lengthwise 5/16" or 8mm.
Cross-drill and tap the head for the setscrew. Shorten the threaded
end until the bolt head seats on the back of the chuck. You might be
able to do this well enough for a mixer on a drill press.

I can't think of a simple, cheap way to attach a smaller chuck. The
root diameter of a 3/8-24 thread is only slightly larger than 0.315".
You could drill out the chuck threads and make an adapter with shallow
threads to match if you have a lathe. A Morse 0 chuck could be drilled
out to 0.315" but they aren't cheap and you might have to turn down
the stirrer shafts to fit into them.

Jim Wilkins

Posted by Robert Swinney on April 13, 2008, 10:01 am
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Jim Wilkins sez: "whole bunch of stuff" . Why complicate the guy's life with a
bunch of drill
press procedure?. Just tell him to buy a set of Dremel tools and take the
little chuck and attach
it with JB Weld. Scheeeesh !

Bob Swinney

> ...Each shaft is .315 "inch (5/16") diameter by 1" L . I want to
> mount a 3/8 or so drill chuck on the direct drive shaft without adding
> too much length....
> The chuck needsto be hobby grade.
> Russ

I know what you mean but I haven't seen the chucks separately. Do you
have the equipment and ability to adapt a common 1/2-20 mount chuck
with an adapter made from a bolt?

Chuck a short bolt in a lathe and drill it lengthwise 5/16" or 8mm.
Cross-drill and tap the head for the setscrew. Shorten the threaded
end until the bolt head seats on the back of the chuck. You might be
able to do this well enough for a mixer on a drill press.

I can't think of a simple, cheap way to attach a smaller chuck. The
root diameter of a 3/8-24 thread is only slightly larger than 0.315".
You could drill out the chuck threads and make an adapter with shallow
threads to match if you have a lathe. A Morse 0 chuck could be drilled
out to 0.315" but they aren't cheap and you might have to turn down
the stirrer shafts to fit into them.

Jim Wilkins


Posted by Jim Wilkins on April 13, 2008, 12:05 pm
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> Jim Wilkins sez: =A0"whole bunch of stuff" . =A0Why complicate the guy's l=
ife with a bunch of drill
> press procedure?. =A0Just tell him to buy a set of Dremel tools and take t=
he little chuck and attach
> it with JB Weld. =A0Scheeeesh !
>
> Bob Swinney

I was looking at a Dremel chuck and a larger chuck with a 1/4-20
mount, There isn't enough room to drill for a setscrew without
removing the shell, and I'm not going to disassemble mine just to
write it up.

Jim Wilkins

Posted by Bob's my cat on April 13, 2008, 6:51 am
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> I bought a used Fisher Scientific overhead lab mixer. The mixer motor
> is a rebranded Bodine gear motor with a direct drive output shaft and
> a gear reduced output shaft. The mixer came without a drill chuck.
>
> Each shaft is .315 "inch (5/16") diameter by 1" L . I want to
> mount a 3/8 or so drill chuck on the direct drive shaft without adding
> too much length.
>
> Originally these mixers were equipped with a shaft mounted chuck held
> in place with setscrews.
>
> I don't know what the chucks are called so my searches come up with
> all kinds of taper mounts. Does anyone know what these chucks are
> called and where I might buy one.
>
> The chuck needsto be hobby grade.
>
> Thanks in advance
>
> Russ

You could try McMaster-Carr (www.mcmaster.com) catalog # 43555A22
motor shaft adapter, which will give you 3/8-24 thread, then an
inexpensive threaded mount chuck, like # 3094A13

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