6-32 multiple start thread .125 lead 4 starts

[ChrisD]

I have to program a thread on a lathe that is

6-32 multiple start (4 starts .125 lead). I know Ive seen it done before. I just can't remember. Can anyone tell me how? M/C lathe 8.1

 

Thanks alot for any replies

 

Chris

[Keith Graydon]

Chris,

 

Cut it 4 times, or however many starts there are. Cut each subsequent start the value of the lead further away (+ direction) from Z 0.

Program one thread cycle with the correct pitch in MCam then TRANSLATE that path (Z+) the correct number of times. Caution here. If your threading to a shoulder the translated paths will each end further from the shoulder than the preceeding one.

 

Each start after the first is offset in Z by (LEAD)/(# of starts).

 

Does this make sense?

 

HTH

KLG

[ChrisD]

Thanks Keith,

 

Just one question though. I saw in the upper right hand corner of the Thread Cut Parameters page a box for "Number of Starts". I tried putting in "4" , and the back plot seemed to work fine. Is this what I may be looking for too? Does mastercam automatically calculate everything here for me?

[Keith Graydon]

Hi,

Posting it out is the best way to tell.

Go to the NC format options scroll box. (just to the left of "Number of Starts" option.) By selecting anything but "longhand" code the # of Starts GREYS OUT.

 

KLG

[gstephens]

quote:

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Just one question though. I saw in the upper right hand corner of the Thread Cut Parameters page a box for "Number of Starts". I tried putting in "4" , and the back plot seemed to work fine. Is this what I may be looking for too? Does mastercam automatically calculate everything here for me?

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Yes. As long as you are using long hand threading (G32 on fanuc) Mastercam will calculate everything for you.