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Thanks guys:) Thanks for the guide. I am going to look through it soon. Also im going to read through the thread milling section of the machinery handbook. Does anyone know if you can use a cnc router with helix interpolation to thread mill really soft materials such as aluminum, copper, brass...

Yeah thats what I was kind of thinking. We'll see:) Oh,... was looking through the machinery handbook again and was studying the thread basic UN form and noticed that the crest and root flats are reversed for internal and external. I could use the same bit to cut external threads too right? I am...

Thank you! Thats what I wanted to know. I will probably go with the 3/4-16 just in case I have a cut a full .75" deep. I just wanted to know if there was a difference form wise if I used a 3/8" instead. Thanks again.

Yes. The thread mill says thread size 3/4 - 16. What do you mean by the length of the thread? How deep I have to go? I dont think I have to go any deeper then the standard .75 length. Im thinking more like .5" in length. Another question. What's the difference between a 3/8-16 and the 3/4-16...

Soooo,.... are you saying that a 3/4 - 16 cutter would work?

The manufacturing process is thread milling via a cnc milling machine. I am not talking about taps and dies nor am I talking about cutting threads with a lathe using some kind of lathe bit. Thread milling. The thread milling cutters are smaller than the holes being tapped so that the holes can...

I understand what you mean about combinations being with reason. But what I dont understand is difference between the cutter thread size and the thread size of the part. I know that 3/8" is a lot smaller than 2-3/8. But what does the diameter of the part(2-3/8) have anything to do with the...

Ok. I did some reading in my machinery handbook and it is great but I am still not quite understanding it. I want to know if the diameter of whatever it is your trying to thread effects the tpi at all? I mean im thinking 16tpi is 16tpi whether im trying to thread a .5" rod or a 3" rod. You know...

Thanks guys! I went out just now and bought the 28th edition of the machinery handbook. I think I have enough info to figure this out. But if I have questions I will be back to ask;) Thanks again!

In a nutshell,... im designing a cap that screws into a tube. I dont know the EXACT diameter of the cap where it will be threaded at the moment but but lets just say for example that its 2.34375". How do I know what thread pitch I can use for this diameter? I've seen charts all over the place...