Decided to make my own carbide cutter chisel(s). No issues with handle or steel square stock.
So far, one cut thread, two broken taps. the first one broke off in the hole resulting in a do-over.
second one broke after I had fully cut the tap and there was enough to twist it through the hole
with vice grips. I know first problem is I'm using a cheap Irwin tap from Amazon. But I'm chamfering
before tapping, using cutting oil, holding the bar in drill press vise and using the drill press chuck to
hold the tap and turning 1/4 turn forward/backward by hand. Seems to cut easy? Alignment is good?
But still breaking?
I don't expect my 3rd attempt to be any different.
My problem is sourcing a quality 4-40 NC tap.
I'm in the Toronto Canada area and I'm not confident with what big box places have to offer vs Irwin.
I'm no machinist but expect there are specific tap brands out there that will stand up to more than what
I'm experiencing.
My apologizes if this has been discussed in the past….I'm new
.
thank you
So far, one cut thread, two broken taps. the first one broke off in the hole resulting in a do-over.
second one broke after I had fully cut the tap and there was enough to twist it through the hole
with vice grips. I know first problem is I'm using a cheap Irwin tap from Amazon. But I'm chamfering
before tapping, using cutting oil, holding the bar in drill press vise and using the drill press chuck to
hold the tap and turning 1/4 turn forward/backward by hand. Seems to cut easy? Alignment is good?
But still breaking?
I don't expect my 3rd attempt to be any different.
My problem is sourcing a quality 4-40 NC tap.
I'm in the Toronto Canada area and I'm not confident with what big box places have to offer vs Irwin.
I'm no machinist but expect there are specific tap brands out there that will stand up to more than what
I'm experiencing.
My apologizes if this has been discussed in the past….I'm new
.thank you
