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I have never heard of a metric thread dial. When cutting metric threads with an imperial lead screw lathe, one normally engages the half nuts and leave the half nuts engaged until you are done cutting the thread. Do not disengage the half nuts. Reverse the lathe to return the carriage to the starting point after backing out the cross slide.
On Jan 3, 2021, at 9:57 AM, Davis Johnson <davis@...> wrote:
The metric thread dial is intended for use with a metric lead
screw, not transposing gears.
Conventional wisdom is that the normal threading dial is not
useful with the transposing gears, no doubt why you are interested
in the metric thread dial.
I have read a contrary opinion, that it will work if you
reposition the carriage the same place for every pass (perhaps a
carriage stop to the right of the carriage? might have to go on
the rear v-way.) AND start on the same dial mark each time. It
sounds reasonable to me.
I have been wanting to try this for some time, but haven't done
it yet. Next best thing for me would be for you to try it.
On 1/3/21 8:58 AM, Al Costich wrote:
For some silly reason, I am in the hunt for a metric thread dial
for a 9A.
Some time ago I acquired a 127/100 transposing gear set and some
Thinking forward, i would like to single point some metric bolts.
I'm not confident enough to make a thread dial myself.
So, should anyone have one that is superfluous to their needs,