I'm making a reamer pusher. I machined a #3MT (to match the tail stock on my 12" x 36" lathe) on the end of a piece of 1" CRS with it between centers in the 9" SB that has a taper attachment. I reversed it, put it in the spindle (which is a #3Mt on that lathe), parted it off and faced the end perfectly perpindicular and the OD dead true with the spindle centerline.

The diagram I have (from this forum) says to make the hole in the end deep enough so that the spot faced reamer pusher is what bears on the end, and to make the hole about 0.020" bigger than the reamer shank.

So my question, what is the diameter of a chambering reamer shank? If the brand or cartridge matters, I'm going to be rebarreling a .22-250 Rem., .243 Win., and .243AI using PTG reamers.

Thanks
Fitch

On my Clymer 7 M/M Weatherby reamer, it is .440", on my JGS .22 Cheetah Mk1 and .22 PPC, it's .435", if that helps.

quote:

Originally posted by Masterifleman:
On my Clymer 7 M/M Weatherby reamer, it is .440", on my JGS .22 Cheetah Mk1 and .22 PPC, it's .435", if that helps.

It does. I'll make a .460 hole.

Hmmm, it also occurs to me I could bore the end to be perfectly concentric at 0.5", then make several sizes of pusher adaptor should that be slid in position and captured by a setscrew. I'm in the mood to do some turning anyway - this idea is growing on me.

Thanks
Fitch

If all your making is something to push the reamer I'd suggest you just use a dead center and hold the reamer with a small wrench. A fixed pusher is just asking to make an oversized chamber. Now, if you are making a floating reamer holder, that's a different story, but I sometimes use a dead center in my JGS reamer holder. To answer your question, reamers I have come with a variety of different shank sizes, which is the reason JGS offers a Jacobs chuck as an option for their floating reamer holder.

quote:

Originally posted by Toomany Tools:
If all your making is something to push the reamer I'd suggest you just use a dead center and hold the reamer with a small wrench. A fixed pusher is just asking to make an oversized chamber. Now, if you are making a floating reamer holder, that's a different story, but I sometimes use a dead center in my JGS reamer holder. To answer your question, reamers I have come with a variety of different shank sizes, which is the reason JGS offers a Jacobs chuck as an option for their floating reamer holder.

I'm making a floating holder.

I think you just convinced me to make it so I can have adaptors on it to deal with different shank sizes.

Fitch

I thought standard reamer shanks were supposed to be 7/16" or .4375 in. Most of mine are.