David Morrow
Well-Known Member
- Joined
- Sep 8, 2008
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I'm boring the hot end cylinder for a Moriya Stirling fan. It has an I.D. of about 1" and a depth of about 2". I drilled the hole to the approximate depth and diameter and then carried on with a boring bar to final dimensions.
The problem is with the bottom of the cylinder which is a blind hole. Due to the depth, I had to use a larger boring bar. But I could not get the bottom of the hole perfectly flat. It actually became a bit convex. To solve the problem, I put a 3/8" end mill in my drill chuck / tail stock and then slowly taking the bottom to final depth but only for the 3/8" diameter of the end mill. I then had a little divot into which my boring bar could penetrate and then work towards the outside of the bore. ( I hope that makes sense ).
Is there a better or easier way to do this ?
The problem is with the bottom of the cylinder which is a blind hole. Due to the depth, I had to use a larger boring bar. But I could not get the bottom of the hole perfectly flat. It actually became a bit convex. To solve the problem, I put a 3/8" end mill in my drill chuck / tail stock and then slowly taking the bottom to final depth but only for the 3/8" diameter of the end mill. I then had a little divot into which my boring bar could penetrate and then work towards the outside of the bore. ( I hope that makes sense ).
Is there a better or easier way to do this ?