Need Help! How to make 2"1/2 NPT left hand threading on Haas SL-20 - CNCzone.com-The Largest Machinist Community on the net!

parktoshi · #1 04-03-2009, 09:35 PM

Hi everyone,

Can someone help me? How I can make the 2"1/2 NPT left hand thread. What's G code I use for.

Thank you for your help.

Geof · #2 04-03-2009, 10:39 PM

G76 or G92 with a value for I to give the taper. You run the spindle in reverse and have the cutter upside down.

If you don't have a manual go to this link and your can download a pdf file.

http://www.haascnc.com/custserv_updates.asp#manualupd

prupp · #3 04-08-2009, 05:27 PM

i learned the hardway to be sure the I (taper) is correct as far as negative or positive, i think an id thread has a positive I number, just shift your tool out and run air passes to confirm. do you need help as far as calculating the taper and code?

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