7/8” reamer- What Now?

Glenn Brooks

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H-M Supporter Gold Member
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Nov 14, 2014
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Ahaha, so here’s a great idea gone awry.

Just received this great eBay buy - a NOS 7/8” reamer! Bought it to size the axle bore for a new spur gear on an old 1950’s hand crank sheet metal roller machine we are restoring.

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Only problem is, the shaft is around 3/4”- way to big for my 3 MT lathe tailstock chuck! What was I thinking!??

Now what do I do???

Am thinking about turning the end down to 1/2” so I can chuck it up. Or maybe try to turn in into a 3 MT shank... but afraid to screw up the concentricity of the shaft...

Any ideas how to best make use of this beast?
Glenn
 
I'd make an adapter with an MT3 shank and a hole in the front to fit the shank and set screws to clamp it.

The other option is to mount the workpiece to the saddle and chuck the reamer in the headstock.

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I expect it has centers on both ends. Turn it between centers to reduce an inch of the shank.
 
Just reduce the shank.
I did that with a bunch of large taper shank drills I obtained a while back.
 
If you use ER collets you could buy an MT3 collet chuck. Nice tool to have around.
 
I've seen a lot of reamers with the last inch or so turned down to fit a smaller chuck.
 
If you use ER collets you could buy an MT3 collet chuck.

That gets my vote.
I got an ER-40 mt3 chuck. works in my tailstock for times like that and with the mt5-mt3 adapter that came with my lathe it also works in the headstock. Made a drawbar for it for the headstock, depending on what I'm doing it's often not needed for light small jobs.
 
Unfortunately, don’t have any Er collets, but might be worth looking into. Think I will try turning down the diameter to fit my existing chuck. I plan to use this reamer to clean up a bunch of other holes in miniature train wheels latter in the summer. So lots of usage on the board, beyond the one spur gear.

Thanks all,
Glenn
 
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