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Metalworking (rec.crafts.metalworking) Discuss various aspects of working with metal, such as machining, welding, metal joining, screwing, casting, hardening/tempering, blacksmithing/forging, spinning and hammer work, sheet metal work. |
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I picked up a few brass candle sticks in garage sales. I wanted to use one
for a brass sundial. It has a long stem and a cup for the candle. The stem is irregular with some patterns on it. I cut the stem off where I thought it would be just about right length for the gnomon. I tried to "turn" it in my old drill press. It turned out not so bad, I put a 10-32 thread on one end and tried to re-profile the rest of it. It is about 5 cm long so I thought I would use the live center I have for my sanding drums. like this one: http://www.leevalley.com/wood/page.a...02&cat=1,42500 This is where I run into a bit of a problem - drilling the centre hole. The candlestick was made in India, I am not sure how. Either way not very well so the whole thing is a bit asymmetrical. I tried to determine the centre of the end to drill a concentric hole but found it almost impossible. In the end when hooked up to the live centre (which is loose on the drill press table) the live centre was running around in a small circle whatever I did. Now I understand (I hope!) that on a lathe the live centre on the taistock is lined up with the centre of the chuck on the head stock and the hole will be drilled in the centre by default. Not having a lathe the best way I found to drill centres in a round stock is to make a paper tube around it and use a tight fitting transfer punch to mark the centre. This works fine if the stock is cylindrical, not on a candle stick stem which is not. I found a thread on this group from 2004 which provided several options of which the only one viable in my situation would have been to use a 3-jaw chuck to center under the drill press spindle and then substitute the centre drill. And I am indeed looking for a cheap 3-jaw chuck. Are there any other suggestions ("Buy a lathe!" does not count)? The other thing that puzzles me (and please note that the nearest I have been to a lathe is in the movies and picutres in books) is how do you start turning something that is irregular in shape? Or even how do you turn a round piece out of a square stock? Does it not do horrible things to the cutting tool when it contacts only at the corners? Or is there a trick to get the shape roughly round first somehow? I want to change the shape of the brass cup but the initial attempt was somewhat discouraging. Thanks for all your patience, -- Michael Koblic, Campbell River, BC |
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