Hehe, nice! Our machinist once declined grinding with his CNC like that, because he said the rotational speed of the CNC spindle is to low for grinding. But it looks like it still works.
Great idea for old carbide! May have to try this trick eventually. IIUC the bit was allowed to spin within the er32 chuck within the er40...? If that's the case, how did you ensure that the "lead" cutting edge (the one that would cut the flat in the final picture) was 90 degrees considering it was held by hand?
Yep. The ER30 shank bottoms out on the machine table, so there was a hard stop that set the cutter width and squareness of the underside. I actually tilted the table a couple degrees off 90, so there's a tiny bit of relief behind the outer cutting edge.
Still liking it. I have been noticing some calibration issues for >3 axis stuff though, which I'm working on measuring properly.
Hehe, nice! Our machinist once declined grinding with his CNC like that, because he said the rotational speed of the CNC spindle is to low for grinding. But it looks like it still works.
ReplyDeleteGreat idea for old carbide! May have to try this trick eventually. IIUC the bit was allowed to spin within the er32 chuck within the er40...? If that's the case, how did you ensure that the "lead" cutting edge (the one that would cut the flat in the final picture) was 90 degrees considering it was held by hand?
ReplyDeleteAlso, still liking that machine?
Yep. The ER30 shank bottoms out on the machine table, so there was a hard stop that set the cutter width and squareness of the underside. I actually tilted the table a couple degrees off 90, so there's a tiny bit of relief behind the outer cutting edge.
DeleteStill liking it. I have been noticing some calibration issues for >3 axis stuff though, which I'm working on measuring properly.