Try making a couple of passes without advancing the tool. It
sounds like the work is deflecting, which a follower rest will take
care of. Repeating a finish cut without changing the tool setting
will also take care of it. You'll be surprised at how much cutting
is done on the 2nd pass! Then again, .002" is my idea of a heavy
finishing cut.
Roy
--- In 7x12minilathe@..., Nick DeFeo <ntdefeo@y...> wrote:
Good Morning, Roy:
I got around to shimming the headstock this weekend past. Took
several tries but the head and tail stock are now in perfect
alignment. Once this was completed, I centered a length of 12L14
between centers and indicated both the top and rear of the stock for
alignment. I got readings of less than 1/2 of 0.001" in both planes
which I thought were pretty accurate. When I took a light 0.010" cut,
both ends of the stock were spot on, but the center was about 0.007"
larger. What would cause this slight "bulge" in the center of the
stock? I had the live center firm but certainly not forced into the
stock to cause a bow in it. As I do not have a follower rest, would
that eliminate this minor change in diameter, or is this within
reason for the accuracy of these machines? Best regards, Nick
<<SNIP>>>
