Nick H
Aluminum
- Joined
- Jun 13, 2007
- Location
- Westfield, WI
Well I've got a few jobs that I've ran over the past year that require some decently low micro finishes of 32 max. I took the job from the multi-spindle department in our shop because they could not turn 32 micro and had to have parts sent out for grinding. Using some Sandvik CNMG 432 WF 4015 grade inserts I was able to hold finishes in the teens and 20's easily and with decent tool life. Well Sadvik has cut this grade from production and replaced it with a 4215 grade. Problem is the insert life is more then cut in half now.
I'm turning 12L14 steel on a Puma 10HC lathe, 1.747 o.d. sfm of 950 feed .005", worked excellent on the old inserts. I had to turn the sfm up to 1200 to get a decent finish on the new inserts, but as stated it only last for 30 pcs instead of 150+ pcs per cutting edge! Then it jumps up to 32+ on the micro finish. I'd like to keep the spindle speed under 3k since it's rather large stock and being feed by bar feeder in 4ft. sections. Also might need to note that O.D tolerance is only +/- .00025". At spindle speeds over 3k it wants to use the whole tolerance instead of holding .0001 or so. Coolant is a synthetic water based, Benz Oil Dura Kool H.j
Anyone got any tips or ideas?
I'm turning 12L14 steel on a Puma 10HC lathe, 1.747 o.d. sfm of 950 feed .005", worked excellent on the old inserts. I had to turn the sfm up to 1200 to get a decent finish on the new inserts, but as stated it only last for 30 pcs instead of 150+ pcs per cutting edge! Then it jumps up to 32+ on the micro finish. I'd like to keep the spindle speed under 3k since it's rather large stock and being feed by bar feeder in 4ft. sections. Also might need to note that O.D tolerance is only +/- .00025". At spindle speeds over 3k it wants to use the whole tolerance instead of holding .0001 or so. Coolant is a synthetic water based, Benz Oil Dura Kool H.j
Anyone got any tips or ideas?