01-03-2015, 02:42 PM
Jack,
You have to be a little careful just how you approach the work with those. I have the same tool (in a 1" shank) and get perfectly acceptable finishes from it.
What you CAN'T do with it is "back turn" despite its ability to get into a tight spot and do just that. Is that what you tried doing? It doesn't work because its still a negative rake insert and is tipped at the -5º angle.
Assuming that wasn't the case, how about giving me the insert nomenclature after the "VNMG331" which will be the chipbreaker and grade information? They would only give a poor finish if you were too high or low from center, or getting chips coming over the top of the insert and scratching the surface as you cut. The latter is not an uncommon occurrence and the only corrective action is to use a feed rate and depth of cut better matched to the chipbreaker.
No, you did NOT waste money getting the holder! When you get the right cutting conditons the VNMG inserts work great!
Ken
You have to be a little careful just how you approach the work with those. I have the same tool (in a 1" shank) and get perfectly acceptable finishes from it.
What you CAN'T do with it is "back turn" despite its ability to get into a tight spot and do just that. Is that what you tried doing? It doesn't work because its still a negative rake insert and is tipped at the -5º angle.
Assuming that wasn't the case, how about giving me the insert nomenclature after the "VNMG331" which will be the chipbreaker and grade information? They would only give a poor finish if you were too high or low from center, or getting chips coming over the top of the insert and scratching the surface as you cut. The latter is not an uncommon occurrence and the only corrective action is to use a feed rate and depth of cut better matched to the chipbreaker.
No, you did NOT waste money getting the holder! When you get the right cutting conditons the VNMG inserts work great!
Ken