I'm working on a non engine related project and I need to drill a 3/4" hole 6" deep through a piece of aluminum square stock. I need to fit a 3/4" DOM tube in the block, the finish on the hole isn't critical I will hone / size the hole for the fit I need. I will be using my 12X36 Craftsman lathe with a 4 jaw to do this.
I have 3/4" drill rod I'm going to make a D-bit from, my question is should I put a point on the D-bit or leave it square on the end with a slight chamfer on the edge?
My plan is to predrill with a smaller size, I have a 3/8" D-bit made that is long enough. I could make up a 1/2" D-bit to follow up with then finish with the 3/4" D-bit.
My other thought is to use a 3/4" ball end mill I have to start the hole then finish boring it through with the D-bit.
Thoughts and opinions please.....
I have 3/4" drill rod I'm going to make a D-bit from, my question is should I put a point on the D-bit or leave it square on the end with a slight chamfer on the edge?
My plan is to predrill with a smaller size, I have a 3/8" D-bit made that is long enough. I could make up a 1/2" D-bit to follow up with then finish with the 3/4" D-bit.
My other thought is to use a 3/4" ball end mill I have to start the hole then finish boring it through with the D-bit.
Thoughts and opinions please.....