Threadmill Depth Control

[travisguilbeau]

I've been using the 2D threadmill feature for some time now and it's a little frustrating with the way the depth per pass is controlled. I usually edit the number of stepover expression to PitchDiameteroffset/number of passes for my depths. It's not an ideal situation because I'd like it to take... let's say 3 passes but my first pass is an air cut. Which makes the last two passes heavier cuts and I have to run a spring pass adding to the cycle time, not to mention the 1st air cut.  I seen some softwares have percentages like 1st pass- 60% 2nd pass- 90% 3rd pass- 100% depth. I've found a work around but I wanted to know if there is an easier way. What I started doing now is I make a threadmill cycle, duplicate it 2x for a total of 3 passes and the  1st pass I click the option to leave stock and leave  .030" ,  2nd pass - .010" and last pass 0" so it's at full depth. Then I put that in a folder and use a circular pattern. It gives me great control because on the heavier cuts I can change feeds and speeds if needed but it's just time consuming. Has anyone found a better way?

[seth.madore · Accepted solution]

No, there really isn't a better way to do this. If you don't mind me asking, what is your common material and what machine are you using?
I ask this because I do a LOT of threadmilling in stainless and titanium in my shop. 2 passes; one for a rough that leaves .004 stock, and then a finish pass. Sometimes I'll have it repeat that finish pass if it's a deep hole..

This is on my Mori or Kitamura VMC

[travisguilbeau]

We do everything but majority of the time it's just your common carbon steels. I notice with deep holes I have some deflection too as you mentioned. I mainly use a two flute single point threadmill I want to say 1" shank to a reduced neck of .630" with an .815" cut diameter, 2.375" stick out. We only have HAAS mills too.

[CGBenner]

@travisguilbeau  Did the information provided by @seth.madore answer your question? If so, please use Accept Solution so that others may find this in the future. Thank you very much!