Lathe Question

[Ben H]

I have a fairly new Grizzly G0509 lathe that I’m wanting to start chambering in. After taking some measurements it appears the tail stock is .006 higher than the spindle. This was done with the height taken off of Bison dead-centers in the head and tail stock.

How do I deal with this? It seems to me that the reamer will cut a non-concentric chamber. Will a Bald Eagle or a JGS floating holder adjust for this?

Thanks in advance as I’m brand new to this.

Regards,
Ben H

 

[Walt Krafft]

That is why a floating reamer holder is used. But, I would also question your measurment. New machines come with an inspection sheet, what does it say? Is your machine level with no twist? If you sweep the tailsrock with an indicator in the spindle what do you get?

 

[Will Henry]

Turn the lathe on and let it run, for fifteen minutes, at 500 rpm or so. The idea is to warm the headstock up. height will increase. BTW, the reamer would cut oversize, not eccentric. WH

 

[Hal]

New machines come with tail stock a little high to account for wear over time. And the tail stock will sag under a heavy load.
Use a flat reamer pushing tool.

Hal

 

[Ben H]

That is why a floating reamer holder is used. But, I would also question your measurment. New machines come with an inspection sheet, what does it say? Is your machine level with no twist? If you sweep the tailsrock with an indicator in the spindle what do you get?

I don’t recall an inspection sheet when I bought it. Yessir it’s level as we did that first. Haven’t swept the tail stock as I’m unfamiliar on how to do that.

 

[rwj]

One would think that there is a place for shimming on the tailstock for alignment and to compensate for wear…

 

[Will Henry]

I show a brief description of tailstock alignment on You Tube. Will Henry's Workshop. WH

 

[Jon Leary]

Do what Hal said. let the reamer follow the bore.

 

[LVLAaron]

The JGS holder only floats the reamer axially - which is good, if the tailstock is 6 thou high, but still parallel to the headstock. If the tailstock is pointing up, you'd need a floater like the PTG

 

[hoz53]

I have a fairly new Grizzly G0509 lathe that I’m wanting to start chambering in. After taking some measurements it appears the tail stock is .006 higher than the spindle. This was done with the height taken off of Bison dead-centers in the head and tail stock.

How do I deal with this? It seems to me that the reamer will cut a non-concentric chamber. Will a Bald Eagle or a JGS floating holder adjust for this?

Thanks in advance as I’m brand new to this.

Regards,
Ben H

dont those grizzly gunsmith lathes have a feature on the tailstock so you can torque it down and adjust for this??

 

[Ben H]

dont those grizzly gunsmith lathes have a feature on the tailstock so you can torque it down and adjust for this??

Yes. 50 ft-lbs brings it down to .002. Seems like a lot.

 

[WSnyder]

And if you use a Bryant/Tooley pusher you won't really care or need to care about where the tailstock is

 

[Ben H]

New machines come with tail stock a little high to account for wear over time. And the tail stock will sag under a heavy load.
Use a flat reamer pushing tool.

Hal

What’s a good, recommended flat pusher?

 

[WSnyder]

What’s a good, recommended flat pusher?

Bryant/Tooley pushers are homemade. The handle is a re-purposed neck turning brass clamp and the tailstock insert is made right on your very own lathe. There should be pictures floating around here. If I get out to the shop anytime soon I'll take some pictures.

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[danny]

I show a brief description of tailstock alignment on You Tube. Will Henry's Workshop. WH

I just subscribed.

Danny

 

[Infrequent Shooter]

Experience and knowledge on this site makes great reading.

 

[Ben H]

I just subscribed.

Danny

I subscribed as well!

 

[DR_2297]

Put a piece of stock in chuck, turn to diameter of the tailstock barrel, push the together and put a dial indicator on the carriage and bridge the two to see how much higher / lower and L/R you are.

My G4003G takes 40 ft-lb on the tailstock to bring the vertical on center. Moves it .003”.

 

[Jonnyofalltrades]

Put a piece of stock in chuck, turn to diameter of the tailstock barrel, push the together and put a dial indicator on the carriage and bridge the two to see how much higher / lower and L/R you are.

My G4003G takes 40 ft-lb on the tailstock to bring the vertical on center. Moves it .003”.

That might sort of work, but it sounds really awkward. Just mount a dial indicator in your chuck with a short, rigid holder(you don't want any sag) and sweep the tailstock. Lock the tailstock down before you do this. The reading you get is double what the actual offset is, as you are reading the error on both sides.