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monkeythedrummer
Advanced Contributer
United Kingdom
9184 Posts |
 Posted - 19/08/2012 : 22:15:18
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I was wondering if we have any engineering types here?
I want to bend some aluminium to make some bass drum spurs. I've tried out a piece of 8 mm aluminium with 4 mm walls which bend really well - just enough to do, but not so they'd bend accidentally afterwards.
Anyway, I want 10 mm tubing, what kind of wall diameter would give me a similar amount of flexibility?
I don't ask for much, do I? 
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100% NOT SELLING Yamaha DTXplorer Module, 5x ddrum triggers, mesh heads and Yamaha E-cymbals. |
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capt.wierd
Advanced Contributer
USA
7365 Posts |
Posted - 19/08/2012 : 22:52:14
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| Not so much engineering but mechanics, solid stuff bends better without the chance of kinking. There are companies that do tube bending as well as solid. Best tube benders.....were in a town called Beverley, Dean and Son, no longer there. Check online. |
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scaryhair
Advanced Contributer
United Kingdom
2202 Posts |
Posted - 20/08/2012 : 08:16:33
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Ive got some 8and10mm pipe benders in my van. But, they make quite tight curves. Its usually for copper. But ive done steel before. Look online for plumbing pipe benders or pipe springs. These are aimed at hollow pie ovviously, but at 8 and 10 mm it should easy enough |
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Mike Dolbear Forum plumbing and heating question answerer.
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Captain Bubble
Advanced Contributer
United Kingdom
14650 Posts |
Posted - 20/08/2012 : 08:19:24
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I tried various available bending tools for bending the square steel tube of the legs on my Tour Timps, but nothing available did a nice job so I made my own bending jig, welded up from several bits of thick steel plate and a bit of scaffold sized tube (NEVER weld galvanised steel, very toxic!!!)
I would suggest 2 mm so you have a bit of strength. thinner might be ok for a while, but might bend progressively each time the beater hits, bending and re-bending will progressively weaken it. heat from a gas torch can help, so can filling the tube tightly with sand and plugging the ends firmly. A plumbers bender can be modified for smaller tube: you could make smaller diameter mandrels by drilling a 10 mm hole through a block of ali or steel, then cut the block in half lengthways. |
Marcus de Mowbray
www.330studios.co.uk/marcus |
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Captain Bubble
Advanced Contributer
United Kingdom
14650 Posts |
Posted - 20/08/2012 : 08:45:45
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Thinking more about it, I am so used to working steel I sometimes forget how easy ali is to work! get a pice of 10 mm thick good quality ply, cut an arc about 1-3 mm radius and glue/screw it to a ply base board so that the board has a good overlap beyond the arc. Include a few inches of straight ply one end of the arc, perhaps with locating blocks or pins. Shove in the ali tube, clamp it in the vice and bend. It might help to fit a steel tube over the end of the ali, fitted with a "click stop" so its position is the same each time you bend a tube; this will keep things consistenet, especially if you sand-fill and plug. De-burr the end of the steel tube with a plumber's "Bogey Bandit" de-burring tool (or a round file) so that it does not mark the ali.
Ideally to bend ali you rub soap on it and heat it till the soap goes black, then bend and quench, but plumber's gas torches might not create enough heat, and the black soap residue can be a pain to remove. Sleeving the ali before bending can also help, paper, tape, old inner tube or whatever. |
Marcus de Mowbray
www.330studios.co.uk/marcus |
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martydrums
Advanced Contributer
United Kingdom
6146 Posts |
Posted - 20/08/2012 : 12:20:06
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| Eh Monkey, the 8mm ali tube you tried out was a 4mm wall thickness? Does this not make it solid? Or is the 8mm a radius? Can you not just go with 10mm solid ali bar? |
Official Sugar Daddy of the forum's Sonor Delite appreciation society, as nominated by Jamoca - Honorary President Paul Brook
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moosetication
Advanced Contributer
United Kingdom
12066 Posts |
Posted - 20/08/2012 : 13:24:52
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quote:
Originally posted by martydrums
Eh Monkey, the 8mm ali tube you tried out was a 4mm wall thickness? Does this not make it solid?
That confused me too. I concluded it must be 8mm internal diameter. |
"It's just a rest, no need to complicate it with monkeys." - sunshinehead
SITMS #31/582 (B'ham) #31/798 (M'cr) | The Blue Road | Jive Honey |
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martydrums
Advanced Contributer
United Kingdom
6146 Posts |
Posted - 20/08/2012 : 13:52:50
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| ^ That would 'splain it. |
Official Sugar Daddy of the forum's Sonor Delite appreciation society, as nominated by Jamoca - Honorary President Paul Brook
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Captain Bubble
Advanced Contributer
United Kingdom
14650 Posts |
Posted - 20/08/2012 : 14:35:03
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| Could be 8 mm with 2 mm wall thickness and he has added both sides of 2 mm to make 4 mm. So 8mm tube with 4mm bore. |
Marcus de Mowbray
www.330studios.co.uk/marcus |
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