I need to make a tiny slot 0.050 deep 0.050 wide 0.1 long
I have a 40 taper CNC machine It's supposed to have a 10k spindle but it seems to start to vibrate around 6k and even up to around 8500 it's not too bad but makes a bit of a hum which I'm sure isn't good for delicate end mills. I'm not sure if that's the issue or it's my feeds and speeds the tool is held in a shrink-fit holder probably can't do much better for runout.
I'm using a stubby little 1mm (0.040) 4 flute center cutting carbide end mill. I've broken two already and haven't made much progress. the material is 17-4 stainless. I'm taking 0.0003 per tooth trying to ramp into the material at a 3-degree angle just milling back and forth while raming down. I had the RPMs at 8k. so that recipe definitely doesn't work. Barely made a scratch.
I'm wondering what parameters I should start tweaking, I really don't know another toolpath to accomplish what I'm trying to do maybe plunge straight into the material and cut across. It's full engagement which I know ideally I would be taking a small radial. Also, everything being equal can I slow the spindle down to around 5k and run slower, so I can be sure the vibration isn't a factor? I know these little cutters are most efficient as far as material removal at a certain SFM but I can run it slower right?
What can I do to make these end mills live a little longer? Please help.
I have a 40 taper CNC machine It's supposed to have a 10k spindle but it seems to start to vibrate around 6k and even up to around 8500 it's not too bad but makes a bit of a hum which I'm sure isn't good for delicate end mills. I'm not sure if that's the issue or it's my feeds and speeds the tool is held in a shrink-fit holder probably can't do much better for runout.
I'm using a stubby little 1mm (0.040) 4 flute center cutting carbide end mill. I've broken two already and haven't made much progress. the material is 17-4 stainless. I'm taking 0.0003 per tooth trying to ramp into the material at a 3-degree angle just milling back and forth while raming down. I had the RPMs at 8k. so that recipe definitely doesn't work. Barely made a scratch.
I'm wondering what parameters I should start tweaking, I really don't know another toolpath to accomplish what I'm trying to do maybe plunge straight into the material and cut across. It's full engagement which I know ideally I would be taking a small radial. Also, everything being equal can I slow the spindle down to around 5k and run slower, so I can be sure the vibration isn't a factor? I know these little cutters are most efficient as far as material removal at a certain SFM but I can run it slower right?
What can I do to make these end mills live a little longer? Please help.