I wish we could afford cermet! The insert is on center and I'm not sure about the helix angle, these inserts fit in the grooving holders so no anvil is required. We are approaching at 29-1/2 degrees (59 in the program of course). We found out that there is a parameter in this control (T-1 plus, ancient) that will allow us to increase the accelaration distance. We did that and ran to 200 sfm. Still low but it is more than 2000 rpm, probably enough for this old machine. The threads look much better but there is still chatter for the first 1/2" of the part. I guess with no tailstock and this length of part we might be better off using something like a floating die holder... Thanks for all of the help.
Jason |