On 06/24/2013 11:36 AM, Chris Tofu wrote:
>> A precision class acme thread will have a tighter tolerance between the thread pitches.
>> >For example 10tpi thread
>> >2G class has a tolerance of .0095
>> >3G class has a tolerance of .0044
>> >2G class has a tolerance of .0032
> Wow, aren't those tolerances huge!? Would definitely need a lot more accuracy to produce a diffraction grating. 100,000 or more threads per inch.
No, they are not. Differential accuracy is MUCH better with a preloaded
nut. If you move a foot, you could see 0.01" error, while moving a few
thousandths would more likely be in the tenths or hundredths of a
thousandth range or smaller.
"A word to the wise ain't necessary - it's the stupid ones that need the