- Joined
- Sep 24, 2012
- Messages
- 495
I guess the answer would be about the same no matter what kind of vertical mil I'm using. But mine is a Little Machine Shop 3960 mini-mill.
If I want to drill, ream or bore out a given hole in cast iron to a larger diameter, is there an approved method of positioning the iron piece with the existing hole dead-center under the mill's spindle? I'm very new at this, so please be patient!
What happened was, I took such a piece (it's about the size of your fist, with a 5/16" hole through it, about 2-1/2" long) and clamped it securely on the mill bed. I eyeballed my center, and went for it. I had two pieces to do - the first one came out perfect - the second one was so off-center it was unusable. I used a HSS drill bit, not a mill. Should I have used a mill? So I'm asking so I can learn, and never do that again.
Thanks,
...Doug
If I want to drill, ream or bore out a given hole in cast iron to a larger diameter, is there an approved method of positioning the iron piece with the existing hole dead-center under the mill's spindle? I'm very new at this, so please be patient!
What happened was, I took such a piece (it's about the size of your fist, with a 5/16" hole through it, about 2-1/2" long) and clamped it securely on the mill bed. I eyeballed my center, and went for it. I had two pieces to do - the first one came out perfect - the second one was so off-center it was unusable. I used a HSS drill bit, not a mill. Should I have used a mill? So I'm asking so I can learn, and never do that again.
Thanks,
...Doug