Machinst Threading Input needed

[Al_The_Man]

I am back to implementing a threading routine for a Galil Motion based card and so far am getting pretty good result.
Not being a machinist I need some insight as to what speeds feeds are expected and called for in order to do more quantitative tests.

So now I need some numbers as to what I should be using for feeds speeds with the tooling I have and the test material.
I am using simple 1/2" iron pipe to test, as it is expendable and easy to turn.
The tooling I have is a MTVOR with a TNMC TiN tooling.
After achieving repeatability I now need to take it to the next level.
So far I am using 10 thread/" to test as this is a fairly coarse thread and easy to detect repeatability.
I need to know expected RPM rate and normal progressive infeed rate when implementing single side cutting.
Some articles I have read mention lower than normal cutting rate for threading, but this appears to be contradicted by some of the CNC rates I have seen?
Any help appreciated.
Al.

[Geof]

Originally Posted by Al_The_Man ....Some articles I have read mention lower than normal cutting rate for threading, but this appears to be contradicted by some of the CNC rates I have seen? Any help appreciated. Al.

Sometimes the cutting speed for threading is dictated more by the machines rapid rate rather than the material or tool type. If you want the tool to retract in half a revolution at the end of the thread you may have to keep the rpm below that which would be ideal from a cutting point of view.

[HuFlungDung]

I suppose the rpm range could be nearly anything, depending on the material being cut. There is an incentive to push the rpm in order to get the cleanest, shiniest thread possible. For smaller diameters, I'd suppose 1000 to 1500 rpm?

Infeed is typically not constant except on a very simple cycle as tool load increases proportionally if the depth of cut amount is a fixed increment. So some sort of macro calculation could be employed to create a constant volume chip.

For your 10 tpi, I might take .015" single depth of cut to start.

[Al_The_Man]

Thanks both, this gives me a starting point, I am just starting to implement the exponential infeed (decrease) and one side cutting.
Al.