Acme Internal Thread 1 ½ - 0.250P-2.000L-ACME-2G-LH (8 START) Help
Hi all I am cutting a Multi-start ACME Internal thread with the following spec. [1 ½ - 0.250P-2.000L-ACME-2G-LH (8 START)] using sandvik inserts.
The thread runs for about 3" long. I am getting major problems with cuttings wrapping around the part and inserts breaking. As lead is 2” tool should move 2” per revolution of spindle so we r facing lot of problem. Whether it can be done in CNC machine or conventional lathe is preferred? Please guide what method I should follow and in which way helix angle will affect the insert breakage and how we have to rectify it.
It is being done on a CNC Lathe with spindle power 7.5/11kW and Fanuc Oi Mate-TC controller.
And is there any possibility to rough the profile with DCMT, VCMT, ID grooving (or) HSS boring bar before finishing the thread. Which cycle is preferred G76 or G33 and is there any way of doing a modified in feed. Does any one have any suggestions to this as I have loads more to do and am eating chimes and inserts like there going out of fashion.
I have tried the messing with surface speed but this seems to do nothing. And depths of cut but again nothing seems to be doing anything.
Thank you for your time.
With thanks & regards,
K.Pandiyan.