We're milling a simple block with bore holes and 1/4 taps.
Flood coolant is on for all operations. All tools were made for SS.
2 operations went mostly well. 1/4" drill, no noise, no problems. We tapped those holes (250 rpm), perfectly threaded, expect for the 3rd one (bolt gets jammed).
Other issues we had:
5F 3" facemill (carbide inserts), cutting 0.5 mm. It squealed through the entire operation, and right before the end it burned part of the surface.
Using a 2F 1/2" carbide drill, it chipped both flute edges after 2 drills.
Not the best idea using 4F 1/2" end mill for bore holes, but it squealed through the entire helix. At a 2° ramp angle.
Flood coolant is on for all operations. All tools were made for SS.
2 operations went mostly well. 1/4" drill, no noise, no problems. We tapped those holes (250 rpm), perfectly threaded, expect for the 3rd one (bolt gets jammed).
Other issues we had:
5F 3" facemill (carbide inserts), cutting 0.5 mm. It squealed through the entire operation, and right before the end it burned part of the surface.
Using a 2F 1/2" carbide drill, it chipped both flute edges after 2 drills.
Not the best idea using 4F 1/2" end mill for bore holes, but it squealed through the entire helix. At a 2° ramp angle.