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14th May 2012, 12:12 AM #16
Bob, In that situation (and only if you didn't have enough meat to cover the inaccuracies of punching and hand drilling centers) i would go: Chuck as true as you can, then use a cup center in the tailstock. You can then true a section of bar at each end to run the steady on, again use the cup center to center the job and set the steady. Now you can center drill each end in turn and you are set to go.
A thought that did just cross my mind, was could you make a bush to fit in the lathes bore, with a spindle up the middle that could hold a center drill at one end and be powered by a hand drill at the other. This way the job could be zeroed in the 4 jaw and drilled very accurately. Just a wild thought.
Ewan
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14th May 2012, 12:23 AM #17.
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14th May 2012, 12:32 AM #18
I was thinking about a long bronze bush (or 2 smaller ones for each end) bored to fit a silver steel shaft with a sidelock style holder for the drill bit. The bush could be as simple at a slip fit 90% of the way with a small taper (getting larger) at the outboard end to hold it in place. You could go to the trouble of making it to fit the morse taper and have a nut at the outboard end, but it may mean removing your chuck to put it in and out depending on the chucks bore.
I have not heard the stunning c.....i mean cunning stunts saying in some time....since i worked with other tradies probably....hehehe the things you forget.
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14th May 2012, 12:34 AM #19GOLD MEMBER
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14th May 2012, 12:45 AM #20.
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14th May 2012, 12:47 AM #21
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14th May 2012, 01:34 AM #22SENIOR MEMBER
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14th May 2012, 01:51 AM #23
... and then there is the option of a cat's head of course..... must make one one day for just this purpose....
crawling back into my hole now....
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14th May 2012, 08:12 AM #24.
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14th May 2012, 08:13 AM #25SENIOR MEMBER
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You type too quick joe. You beat me by 7 hours. I had plum forgot about a cat head and that's exactly what they are used for, and square and hex and...
Phil
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14th May 2012, 08:22 AM #26.
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A search for cathead revealed all. A cylindrical sleeve with radial positioning screws .
Simple. Neat.
Cathead
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14th May 2012, 08:34 AM #27GOLD MEMBER
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cats head
i described one last night but the post is missing.
Attachment 208322
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14th May 2012, 08:53 AM #28GOLD MEMBER
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a tip on set up
Pass Along MW
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14th May 2012, 09:06 AM #29.
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14th May 2012, 09:12 AM #30.
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