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Unintended asymetric turning

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DoN. Nichols[_2_] DoN. Nichols[_2_] is offline

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Unintended asymetric turning

On 2010-12-24, wrote:
On 23 Dec 2010 04:18:52 GMT, "DoN. Nichols"
wrote:

[ ... ]

The pre-threaded ones, or the ones which they had to machine to
fit their lathe?

My Clausing came with a 2-1/4x8 spindle nose, and I had to make
some backplates to fit (sometimes enlarging the hole in existing
backplates which had been used on 1-1/2x8 spindles or the like.
Overall, I had no problems with those. The trick for turning the bore
to clear the register was to mount the backplate backwards with a spacer
ring to hold it far enough out so I could bore the threads off at that
end.

The pre-threaded, semi-finished back plates. If I remember correctly
the threads were cut at an angle to the spindle axis. I understand
that it was correctable though.

Depends on how bad it was -- and how thick the backplate was.
You would first have to generate a shoulder on the backplate which is
true to the existing threads (unless you want to fill with weld and
re-thread). Then thread it onto the spindle nose and turn the outside
face perpendicular to the threads. Once you have that, reverse the
plate and turn the back side square too. Then, if you have not lost too
much thickness from a serious off-angle thread -- you can turn the
register for the chuck.

Enjoy,
DoN.

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