My statement was that taps and dies are available in 1/4-23. I said
nothing about lathes.
On Mar 13, 2006, at 1:24 PM, Will Matney wrote:
> 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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>
>
>
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>
Rich Measures, 805.386.3734, AG6K, www.somis.org
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