- Joined
- Mar 3, 2020
- Messages
- 195
I made this home made fly cutter from 1.5" 1018 for 1/4" tool bits. If the 2-1/2" bit was fully extended it would cut 3-1/2".
I need to do some reading and figure out why my chips were so stringy. Probably didn't grind the tool bit properly.
Cutting the bottom face. The Mini Mill didn't like to do more than about 0.020" cuts about 1/2" deep. I elected to go with approximately a 10-degree down angle after seeing This Old Tony set his there and it looked functional and appropriate.
Setting up for the 10-32 set screws. Drilling, chamferring, tapping...
Indicating in the angled face to flat with the mill table.
The finished tool. That's not the appropriate cutter installed, just in place for test-fitting.
Another shot of the tool
First test cuts on a 1" x 2" piece of unknown alloy, likely A36, etc.. The final cut was a few thousandths deep. Hand fed a couple though per rev on the cutter. Hard to gauge RPM on the mini-mill but based on the frequency of interrupted cuts, probably 200-300 RPM = 100-150 SFM. I need to experiment some more and see if I can improve my grind and overall get a better surface finish.
I need to do some reading and figure out why my chips were so stringy. Probably didn't grind the tool bit properly.
Cutting the bottom face. The Mini Mill didn't like to do more than about 0.020" cuts about 1/2" deep. I elected to go with approximately a 10-degree down angle after seeing This Old Tony set his there and it looked functional and appropriate.
Setting up for the 10-32 set screws. Drilling, chamferring, tapping...
Indicating in the angled face to flat with the mill table.
The finished tool. That's not the appropriate cutter installed, just in place for test-fitting.
Another shot of the tool
First test cuts on a 1" x 2" piece of unknown alloy, likely A36, etc.. The final cut was a few thousandths deep. Hand fed a couple though per rev on the cutter. Hard to gauge RPM on the mini-mill but based on the frequency of interrupted cuts, probably 200-300 RPM = 100-150 SFM. I need to experiment some more and see if I can improve my grind and overall get a better surface finish.