- Joined
- Nov 26, 2015
- Messages
- 17
Just bought two feet of 7075 alu. to make a knob for my DR brushcutter. It took a looong
time to cut off a piece with my horizontal band saw. 2 1/2" diameter. No problem since we're using power machinery. Next is to bring it to shape on the lathe. Cuts great. Then the problem comes up.
I need to drill a hole in the bottom to tap a 5/16 hole. Does not want to drill . 1, drill a spotter hole, 2, start off with a 1/8" drill bit. Just does want to cut. 3, tried to drill with the proper bit for 5/16" threads. Still can't drill.
All of the bits I tried we're brand new. Other than changing to 6061 alu ,which I purchased couple of days later, I would like to make my first attempt work.
Can anyone help me out how to drill this hole.
Thanks in advance
time to cut off a piece with my horizontal band saw. 2 1/2" diameter. No problem since we're using power machinery. Next is to bring it to shape on the lathe. Cuts great. Then the problem comes up.
I need to drill a hole in the bottom to tap a 5/16 hole. Does not want to drill . 1, drill a spotter hole, 2, start off with a 1/8" drill bit. Just does want to cut. 3, tried to drill with the proper bit for 5/16" threads. Still can't drill.
All of the bits I tried we're brand new. Other than changing to 6061 alu ,which I purchased couple of days later, I would like to make my first attempt work.
Can anyone help me out how to drill this hole.
Thanks in advance