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Anonymous
en respuesta a: Anonymous

We do quite a bit of thread milling here on a variety of materials. We use single form, partial form, and full form thread mills as well, but I can't say that I have used an NPT thread mill. I don't want to write the obvious, but like other features, having your tool drawn exactly to size is critical.

 

I'm not following your process so I'll write what I do.

 

New Feature

From Dimensions-Thread Milling

Type is ID

Select Standard Thread and choose 3/4-14 NPT

All I would adjust here is the thread depth

Next select the location

Next page I select Positive. I have found I get much better threads when I plunge to depth and climb mill. Of course this will be operation specific. I do rough and finish, and usually 1 spring pass.

There is no 3/4-14 so you have to draw one.

I got the attached dimensions using Harvey Thread Mill PN 70226

Should be straight forward from there. As always if it is an expensive part I would use some positive cutter comp and work the tolerance in until I found the right numbers. As long as I draw the tool right the program has always been within .001"-.002". Hope this helps.