"PrecisionMachinisT" wrote in message
...

"Nick Hull" wrote in message
...
In article ,
"PrecisionMachinisT" wrote:

The "splitting" part is what becomes the problem here--it's best done
in
this case with just a plain ole hacksaw....with the mandrel still
firmly
chucked in the lathe....

From start to finish, once you chuck your mandrel blank you should
forget
that you even *own* a chuck key--throw the darned thing out the bay
door
and
retrieve it later......cause if you unchuck the work and have to
re-set
it
then all bets are off....

Nothing says the chuck has to remain on the lathe, just the mandrel
stays in the chuck.


While most mounts are pretty darned accurate, I wouldnt bet on it without
having some familarity with the actual lathe thats being used.


Agreed!

While the error is usually minor, even with a D type spindle, orientation
affects concentricity in many instances. Many of the D type spindles have
a witness mark for that reason.

Harold