[Amps] Proof of idiocy

[Will Matney]

Rich,

I'm not sure, but you know as me that lathes have only certain threads possible by the gear ratios in the quick-change gearbox. Most I've seen that you can do is the standard or metric threads and multiples thereof. About the only way to change that would be some special gearing to the feed screw. Then would the thread dial work to know when to pull the half-nut leaver? Again, a CNC might be able to do this, or use of a special lathe/screw machine. Just trying to figure 23 in my head, and know whats available on the gearbox on most standard lathes, I cant see getting that ratio. A 20 and 23 tooth gear would do it, but I've never seen anything but even numbers of teeth on lathe gears for both metric and inch. 12, 32, and 40 TPI are all standard threads obtainable from a lathe. Heck, they could even use a thread mill but what about the internal thread, the same thing? That one has me stumped on how to obtain it on standard machines.

Best,

Will

*********** REPLY SEPARATOR  ***********

On 3/13/06 at 2:58 PM Rich wrote:

>Is there a chance that it was a 1/4-32 thread, 32 TPI is a special as is
>40 TPI. Some company's do have their own threads made, some V-blocks I
>used to work with had 1/2-12 threads so you had to special order the
>clamp bolts.
>
>An old retired machinist
>
>Rich , kd0zz
>
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