Searchn for Article on chuck mounting.

[h12721]

Hello to All

In one of the magazines Machinist Workshop or the Home Shop Machinist was an article of how to fit a shuck to a treaded nose spindle. He made a duplicate of the spindle Nose thread to check for fit of the chuck. A second one was where a spacer was fitted in a chuck to make a more precise fit. Does one of you guys know what Year or # of the Magazines?
Hilmar

Millman please don't!

[Mike Burdick]

Hilmar,

This is not the information you wanted about the magazine but here's some "online" information pertaining to the same subject...

http://www.metalwebnews.com/howto/ch.../chuckmnt.html

While you are at that site, you might take a look at some of the other interesting information and ideas presented...

http://www.metalwebnews.com/mr.html

[Rich Carlstedt]

Thats a pretty good method that is covered.
For newbie's, the following are some points
Having a close fit to the threads is nice, but not the epitome of all.
it will not hurt to be less snug and prevent interference problems. So you want a running fit between the threads . The stub thread arbor, is to make sure you do not make the threads too tight.
If it matches yours spindle nose with thread gage wires, and is smooth, that is fine. Now when you cut the internal threads, you will have a 100 percent chance of being large enough when you can insert the arbor. ( You NEVER want to re-chuck a backplate for another cut because it is too small !) (scrap time !)
Then when you have the thread cut, the MOST IMPORTANT thing is to face the shoulder of the backplate, so that it is plumb and perpendicular to the threads . This is the most important thing. do not do it as a second chucking !
The chuck is retained (like all things) in 3 axises.
X and Y are done with the threads, they center the spindle and the chuck. Nothing else centers the chuck !(You cannot ever pull a thread from the true centerline of the pitch. Impossible!)
The Z is the face of the backplate, and must be perpendicular to the spindle
Rich