- Joined
- Aug 22, 2007
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- 193
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I attempted to make a part for Elmer's horz. mill engine. It is the head and guide. I did not have a piece of 5/8" large enough to make it in one piece so I was going to try and make it two piece. Here is what I did. I took a piece of 7/8" round stock and cut it 5/8" sq. on the mill. Located the edges and drilled the 4 corner holes. Came out right on the money. I then centered it both X and Y with a DRO and used a 1/4" center cutting bit to make a hole in the center. I measured the same on all sides. I then took it over to the lathe, parted it in the 3-jaw and eyeball centered it in a 4-jaw chuck. (this is my fist attempt at centering anything in a 4-jaw). I put a short piece of 1/4" drill rod in the tail stock and adjusted the jaws until the rod would slide into the 1/4" hole without interference. I proceeded to turn the shoulder to the dia. I wanted. I then took a boring bar (small insert type) and bored the center hole out to 7/16".
Everything looked fine untill I measured and the hole is off center by .015".
Is my method wrong or did I just goof up somewhere??? What is the best/correct to center a square piece in a 4-jaw???
Thanks,
Julian
Everything looked fine untill I measured and the hole is off center by .015".
Is my method wrong or did I just goof up somewhere??? What is the best/correct to center a square piece in a 4-jaw???
Thanks,
Julian