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Dual lead speeds for acme thread

BobMachines

Plastic
Joined
Jun 7, 2021
Hello I am wondering what spindle speed you use when cutting a dual lead acme thread in carbon steel. I'm trying to cut a dual 5tpi acme thread internal left hand thread. I'm using a g76 code, but im getting a lot of chatter. Since the feed is doubled I can assume a lot of tool pressure is generated. How much would you take per pass? Ive seen youtube videos on conventional lathes and it seems they are going slow. I do have the correct seat shim as it is a steep helical angle. Thanks
 

sinha

Stainless
Joined
Sep 25, 2010
Location
india
Try 29 degree in G76. This may reduce chatter because only one edge will be cutting material.
 








 
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