Hi all,

I recently decided to give up my day job and take a stab at the American dream of owning and operating my own business. I have been blessed as I am doing well so far. I recently aquired a new customer in the food processing industry and the first job they gave me required 4140 ht. The finished turned dimensions are 2.5", 1.5" and 1" over a 3" length.
This job and material ate my carbide inserts. Obviously I have the incorrect grade inserts or my speeds and feeds are wrong. My lathe is a tl-1. I tried 3 different inserts. They are the only ones I had on hand. The first insert, an Iscar WNMG 3-1-TF IC20 lasted about 2 minutes before the tip completely melted off. The second insert, Iscar WNMG 3-1-PP IC10 cut okay but needed replacing every part. The last insert was a Mitsubishi DCGT 11T304R-SN. It was prone to edge chipping. I was running at 600 sfm and 0.035 doc. I'm looking for any suggestions that could help me be successful next time this job comes through.

Thanks,

Ray