Tailstock runout

H

hkcarbine

Guest
I have Grizzly 9972Z and have been adjusting tailstock. On a 12" section the difference in diameter is .009 inches. My intent is to work up to chambering some day. Is that variance acceptable? Or should I try to get it smaller? What would be acceptable?

Thanks for the advice!

Roger Q.
 
Roger,
I'm confused. You say the diameter of the tailstock ram varies .009? If you indicate your barrel properly and use a pusher of some type, the tailstock does not have to be perfect.
Butch
 
I assume you are referring to turning a test bar and one end is .009" larger than the other? No, that's not what I would consider acceptable, but as Butch points out, it doesn't have to be perfect. I want mine at less than .001" from end to end on a 12 inch bar, but that has little to do with chambering. As a side note, that lathe you refer to would be too small to chamber all but very small barrels. The spindle bore at 1" wont allow most barrels through it and the 26" bed won't accommodate much length to chamber with the steady rest. It's also a very lightweight machine.
 
Gentlman:

Thanks for your quick response. You're right I did turn a test bar and the diference in diameter is the .009 in number. I realize it is a pretty light machine and certainly limited in capactiy, but wanted to start somewhere. Been retired a couple of years and have always wanted a lathe and mill to 'hobby' with! Back to playing will tweak the tailstock more, and see how small I can get the variance.

Shoot Safe!

Roger Q.
 
Use a dial indicator set on the side, center of your work piece just ahead of the tail stock barrel / dead center after turning a test piece, dial glass up. You can adjust your tailstock by watching the dial indicator and adjusting for half the amount of taper. Make another pass and measure the taper. You should be able to remove most if not all of the taper, at least to .000"

Like has been said, .009" taper isn’t even close.
 
Tail Stock

We adjust our Tail Stocks to where the machine is turning straight, the final step after a good leveling job.
Also, a lot of your small lathes have a adjustable headstock as well, the front mounted on a dowell, the back has a set of opposed bolts that allows you to move the headstock, pivoting on that dowell, untill it turns and bores straight when not using a center.
If you lathe has this, you should do this before you do the tailstock........jackie
 
Way to go..

Nice one Roger.

Do you want some reference sites? fpr that size Lathe?

How's it going?

John Paton
 
Thanks for the advice gents! Will keep going at it, have to load up for HBR match this weekend. John, I would appreciate any reference.

Roger Q.
 
Pm

Hi Roger,

Check your personal messages. I have sent you one.

Best Regards,

John

:)
 
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