68machinist70
Plastic
- Joined
- Mar 18, 2021
Here's my dilemma.
Drilling a .187 hole 3" deep in 316ss.
Using a Walter carbide through coolant drill.
Running in a HAAS Ds30y with high pressure coolant.
I'm not breaking drills or getting chip weld but my hole keeps leading off center by .006 to .012.
I'm spot Drilling with a 90° 1/4" carbide going. 025 deep.
Using a g83 peck cycle withdrawing .5 out of the hole rapid back to .05 from end of last cut.
Tried running recommend feeds and speeds of 116sf , .0045f
I've played with peck depth from .05 to .250, feeds from .0025 to .006 and rpm from 1800 to 2500.
I get the best results around 2300rpm peck of .200 f.003. It holds a few part about. 002 or so off center or better but will then float out then come back.
I've indicated the drill and spot to .0003 c/l. Ive checked horizontal run out so as to make sure its sitting true to c/l length of the drill.
I've been machining plastic for the past 15 years. Shop is now venturing into steel and this is my first job.
Any help is appreciated.
Drilling a .187 hole 3" deep in 316ss.
Using a Walter carbide through coolant drill.
Running in a HAAS Ds30y with high pressure coolant.
I'm not breaking drills or getting chip weld but my hole keeps leading off center by .006 to .012.
I'm spot Drilling with a 90° 1/4" carbide going. 025 deep.
Using a g83 peck cycle withdrawing .5 out of the hole rapid back to .05 from end of last cut.
Tried running recommend feeds and speeds of 116sf , .0045f
I've played with peck depth from .05 to .250, feeds from .0025 to .006 and rpm from 1800 to 2500.
I get the best results around 2300rpm peck of .200 f.003. It holds a few part about. 002 or so off center or better but will then float out then come back.
I've indicated the drill and spot to .0003 c/l. Ive checked horizontal run out so as to make sure its sitting true to c/l length of the drill.
I've been machining plastic for the past 15 years. Shop is now venturing into steel and this is my first job.
Any help is appreciated.