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??? Reamer Holder ????

 
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  #15  
Old 06-14-2010, 08:34 AM
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Re: ??? Reamer Holder ????

Quote:
Originally Posted by Fitch View Post

That said, it is very important to note that none of them, repeat NONE of them, tolerate or compensate for misalignment of the barrel in the headstock - that needs to be dead nuts every time. (I am a huge fan of Gordy Gritters alignment technique.)

Fitch
Gordy Gritters short youtube video of him dialing in a barrel is what lit my fuse on this!!!! I have the range rod from PTG and have practiced using it, I really like what I'm able to do with it and his method clicks in my brain and just makes sense to me. I plan on taking his classes once I have a lathe installed at my home instead of bumming my Father in-laws.

Thanks for the replies again guys.
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  #16  
Old 06-14-2010, 09:12 AM
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Re: ??? Reamer Holder ????

Thanks for staying with us Fitch. Your point about getting 2 centerlines aligned is exactly why it takes hours and hours to align the tailstock. Aligning 2 points, or a point and a line, isn't that hard to do. With the precision bar between the chuck and live center, I had to align with the quill all the way in (just short of ejecting the #3 morse taper shank). Then unlock the tailstock and push it back with the handwheel until the quill ran out of threads and stopped feeding, lock it down and check it again to see how much it drifted off. Adjust and check (by traveling carriage-mounted indicators back and forth on top and on the side of the bar, crank the quill in and out, slide the tailstock back and forth, lock and unlock, etc. Unclamped, my quill sits .002" high. Clamped hard, it's .0005" high and level. As I said, I'm not that good, so I live with it There may be a faster or better way, but I don't know it. The results are worth it though. The first thing I noticed was that when center-drilling, the point was dead still and not trying to circle. Second was that a regular drill point didn't circle or wobble as it fed in. Dead still is good on drills, and really really good on reamers.

Yeah, I can't see how the RockJag holder can float radially, but he may have a small flat in the bottom of the socket. That would do it. The socket is oversize enough to allow a fair amount of axial angularity, and he did say it would float radially too, but not how much. In my case, the tailstock is good enough that it doesn't need much, if any, float and his pusher setup will allow me to feel the reamer torque load, release it when needed, and pull the reamer out easily for cleaning between cuts. I'm looking forward to trying it.

Point taken on the float of the Clymer / Manson, etc, hard mounted floating reamer holders. They do have a lot of radial float by design, but I don't think they allow much, if any, axial angularity. Also, the Clymer holder unfortunately will try to center itself under torque load. I think Mr. Manson's holder truly free-floats, but I haven't used one, so I can't verify that.

Fitch, I'm going to try your procedure of releasing the handle and killing the lathe when stopping a cut. I have gotten a ring in a chamber a couple of times for no obvious reason. Could be a chip getting under a reamer cutting edge when I first retract the reamer. I haven't been killing the lathe to pull the reamer out. I don't know if that's the reason, but it sure makes sense.

Bigngreen, aligning the tailstock is slow, but I'm going to vote for it one last time.

Enjoy, Tom
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  #17  
Old 06-14-2010, 10:25 AM
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Re: ??? Reamer Holder ????

I need to align my tail stock so I'll do that no matter what I do. I was thinking that the Bald Eagle type of pusher had a ground flat in the tool side and then the round head on the tail side would float with in the limits of the hole it goes into.
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  #18  
Old 06-14-2010, 02:25 PM
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Re: ??? Reamer Holder ????

Quote:
Originally Posted by specweldtom View Post
Point taken on the float of the Clymer / Manson, etc, hard mounted floating reamer holders. They do have a lot of radial float by design, but I don't think they allow much, if any, axial angularity. Also, the Clymer holder unfortunately will try to center itself under torque load. I think Mr. Manson's holder truly free-floats, but I haven't used one, so I can't verify that.
Good point. In theory they should both try to self center because of the pins that transfer the torque. Mine and the Bald Eagle don't try to self center, have both radial and angular float.

Quote:
Fitch, I'm going to try your procedure of releasing the handle and killing the lathe when stopping a cut. I have gotten a ring in a chamber a couple of times for no obvious reason. Could be a chip getting under a reamer cutting edge when I first retract the reamer. I haven't been killing the lathe to pull the reamer out. I don't know if that's the reason, but it sure makes sense.

Bigngreen, aligning the tailstock is slow, but I'm going to vote for it one last time.

Enjoy, Tom

I'm careful to keep the reamer cutting once it starts - control the torque with the tail stock handwheel, let the handle go, back off the handwheel, then turn off the spindle. I got the same ring in the chamber you have gotten - that's why I started doing it the way I do now. No rings since I've been letting the handle go.

Let me know how it works.

Fitch
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  #19  
Old 06-14-2010, 02:26 PM
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Re: ??? Reamer Holder ????

Quote:
Originally Posted by bigngreen View Post
I need to align my tail stock so I'll do that no matter what I do. I was thinking that the Bald Eagle type of pusher had a ground flat in the tool side and then the round head on the tail side would float with in the limits of the hole it goes into.
Yes, that is exactly how the Bald Eagle works. It has both radial and angular float.

Fitch
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  #20  
Old 06-16-2010, 10:15 AM
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Re: ??? Reamer Holder ????

Quote:
Originally Posted by bigngreen View Post
I should also mention if any one has a take of .277 cal barrel that I could buy cheap for practice let me know, I don't feel good about practicing on a good barrel
There was a new take off (270) that was still for sale this morning on accurateshooter.com.

I think he wanted $40 plus 15 shipping.

Jim
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