Jim Wilkins wrote:

I've been able to disengage the half nuts when the tool reaches a
1/16" cutoff tool groove by attaching a dial indicator to the ways
with the plunger touching the carriage, and watching the needle
approach one of the adjustable marker tabs.

jw


This indicator idea has been working great. Thanks a bunch.

Today I did some ID threading on some scrap using the indicator to work
things out. I was cutting 20tpi for an ID thread to mate with a 5C collet.
I was hitting my pullout in about a one or two thou. I was thinking of
going up a step on speed but why push it.

Since I had practiced a bunch doing OD threading, I was developing muscle
memory of pulling out CCW as I disengaged the half nuts.

So my first thought of mounting the bar insert up facing me was discarded
for insert down, backside of part. I don't want to have to do a CW pullout
since my muscles just got trained to go CCW and I really hate reversing
reflexes if I can.

I really don't need to see the insert to ID thread, now CCW is the way to
pull out when I hit 12 o'clock on indicator and when I decided I wanted to
look at insert it was easy since the bar was on an Aloris post.

The other nice thing is that the compound did not need to be changed from
the angle it was at of OD threading.

Wes