Machining method for 1/4-16 ACME internal thread

[rambozhou]

I face a problem right now:to make a 1/4-16 ACME internal thread,material for the part is stainless steel, Minor diameter is only about 0.1875-0.1925, I have tried both drill & tap and cutting method, but can not get good result.
Are there any other method to make it? or maybe there are some tips on tapping or cutting.

Thanks!

 

[jbel]

Try a google search for 'micro 100'. They make excellent carbide tools for your purpose.

 

[rambozhou]

I have got contact with micro 100 and ordered 10 cutter for trial, thanks for your information.