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t.g.mandel
662 Views, 11 Replies

Controlling/varying the stepover of multiple radial cuts when using single form thread mills in F360?

I will be experimenting for the first time cutting threads in aluminum with a small single form thread mill and 2.2Kw high speed spindle.

 

In preparation, I have modelled my own tool and have modified the feed rates and pitch diameter offsets using some great resources offered by NYC CNC. I also noticed manufactures recommending multiple radial passes, but varying the tool engagement for each pass given the triangular shape of the cutter (i.e., 1st pass 50%/2nd pass 30%/3rd pass 20%).

 

I want to use multiple varying radial passes, but in F360 I only see the option to choose multiple roughing passes at the same stepover, and the option for a final spring pass. 

 

Is there a way for me to program multiple passes but with decreasing stepovers?

 

I understand that too many shallow passes can decrease tool life, but I want to balance that with the force limits of my small tool and spindle.

 

Any suggestions and insights are appreciated.

 

Tom