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Thread: What does this mean ?
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2nd May 2014, 07:33 PM #1
What does this mean ?
This appeared in a textbook
"On the lathe, centres can be quickly set up by turning a centre on a piece of material held in the chuck and using a bent tailed carrier driving from the chuck jaw . The centre is of course absolutely true "
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2nd May 2014, 07:42 PM #2
I do it all the time......
Put a bit of bar, say 3/4" dia, in the 3 jaw with about 3/4" sticking out. Set the compound to 60deg and turn the bar to a point. Now you have a dead center that is concentric. Using a bent lathe dog you can now turn between centers using one of the lathe jaws to drive the dog.
Ew1915 17"x50" LeBlond heavy duty Lathe, 24" Queen city shaper, 1970's G Vernier FV.3.TO Universal Mill, 1958 Blohm HFS 6 surface grinder, 1942 Rivett 715 Lathe, 14"x40" Antrac Lathe, Startrite H225 Bandsaw, 1949 Hercus Camelback Drill press, 1947 Holbrook C10 Lathe.
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2nd May 2014, 07:50 PM #3Senior Member
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Ive done it plenty of times too, I use a length of 20mm, but I turn a square shoulder on the back to make sure the centre doesnt sink backwards in the chuck in case I didnt snug it up enough. I leave enough meat that I can reuse it a number of times, just take a light cut once its mounted and its true again.
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2nd May 2014, 07:53 PM #4
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2nd May 2014, 09:29 PM #5Distracted Member
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I think this is best practice because it eliminates any possibility of errors in spindle adapters.
If you then pinch a shim between HS & TS centres you have a quick check on TS alignment. >\<
If needed, fine tuning can then be done by cutting and measuring.