Re: Easily cutting metric lens threads on an inch lathe

On Sat, 21 Feb 2009 07:04:15 GMT, etpm@xxxxxxxxxxx wrote:



One of our posters had an issue with a Myford lathe where the silly sods had
fitted a 20tooth idler at the factory (standard on changewheel versions)
instead of the 24tooth used with gearbox fitted machines. He couldn't cut a
thread to save his life until we got him the right gear (Borrowed off my old
man's ML7B)

regards
Mark Rand
RTFM
Greetings Mark,
I'm not getting lucky. I'm cutting a long thread (.375") and made at
least 12 passes because I was sneaking up on the finished size using
lenses as the gauges. The machine has an eight TPI leadscrew. I only
close the halfnuts at the number 1 position on the threading dial. I
also posted the threading info on the optics group and Richard J.
Kinch posted the following reply:

" I'm sure someone has already posted this info on usenet ...

Yes, see:

http://www.truetex.com/hf-enco-12x36-pitch.htm

etc., and the generating code which I have posted here."

I haven't checked out his web site yet but apparently he is doing the
same thing. BTW, the idler gear tooth count doesn't matter as it is
just transfering motion from one gear to another.
Eric


Typo, I didn't mean one of the idlers, I meant the drive gear after the
tumbler reverse. That does make a difference.


Note Don's response re registration.



Mark Rand
RTFM

.

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