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Posted by Joe AutoDrill on March 27, 2006, 12:48 pm
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Not sure if anyone else posted on this (I'm 2500 posts behind in my reading)
but the measurements of the J2-1/2 sure do look the same as the J6 which you
don't show.
If they are the same, you can get a J6 chuck...
Regards,
Joe Agro, Jr.
(800) 871-5022
(908) 542-0244
Automatic / Pneumatic Drills: http://www.AutoDrill.com
Multiple Spindle Drills: http://www.Multi-Drill.com
V8013-R
>I finally removed the chuck from the spindle on my circa 1973 AMT 1/2"
>bench
> drill press -- the one that has been the subject of several threads
> including one that concluded that I was absolutely crazy for believing a
> nameplate that said it has a JT#2-1/2 spindle.
>
> Well, here are the measurements -- along with specifications I've gotten
> from the web
>
>
> JT# Large Dia Small Dia Length
> #2 .5590" .4876" .8750"
> #2short .5488" .4876" .7500"
> #2-1/2 .677" .625" 1.055" <<--- my AMT
> #3 .8100" .7461" 1.2188
>
> It's also not anything close to any Morse taper either, nor a B+S.
>
> I guess it really is a JT#2-1/2 and nothing else.
>
> Which means that there's no way that I can replace the chuck with anything
> better today.
>
> Also, in removing the chuck, I discovered that the set screw that holds
> the
> pulley to the shaft was missing so all speeds under load were slower than
> I
> thought they were. I doubt that this had any effect on the runout, but I
> will measure it after replacing the chuck just to make sure that I haven't
> made it worse.
>
> Norm
>
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>bench
> drill press -- the one that has been the subject of several threads
> including one that concluded that I was absolutely crazy for believing a
> nameplate that said it has a JT#2-1/2 spindle.
>
> Well, here are the measurements -- along with specifications I've gotten
> from the web
>
>
> JT# Large Dia Small Dia Length
> #2 .5590" .4876" .8750"
> #2short .5488" .4876" .7500"
> #2-1/2 .677" .625" 1.055" <<--- my AMT
> #3 .8100" .7461" 1.2188
>
> It's also not anything close to any Morse taper either, nor a B+S.
>
> I guess it really is a JT#2-1/2 and nothing else.
>
> Which means that there's no way that I can replace the chuck with anything
> better today.
>
> Also, in removing the chuck, I discovered that the set screw that holds
> the
> pulley to the shaft was missing so all speeds under load were slower than
> I
> thought they were. I doubt that this had any effect on the runout, but I
> will measure it after replacing the chuck just to make sure that I haven't
> made it worse.
>
> Norm
>