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klogan45
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« on: October 21, 2006, 08:28:25 PM » |
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Hi Guys,
can anyone tell me where I can buy really good tube bender guides.
A mate has loaned me a tube bender (he's not used it for ages and says that I can look after it for as long as I need too and that if he does need it he will bring it back!!!!!!!! COOL) but the guides do not fit the tube exactly and the sides are a bit shallo, so the tube creases.
Any ideas anyone.
Thanks
Take care ride safe have fun.
Keith
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He who holds The Angle Grinder of Destiny holds the fate of bikekind in his hands.
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trikerpete
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like a head with a sore bear :)
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« Reply #1 on: October 21, 2006, 08:32:56 PM » |
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what type/size tube & make/modelbender are you using?
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what do you mean, I cant do that !!  |
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Manky Monkey
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« Reply #2 on: October 21, 2006, 08:37:43 PM » |
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We've got a Clark's bender, (about 80 quid from Machine Mart), & use 4mm wall thickness ERW tubing. Seems to bend with no problem, though the 1 1/2" bore I use for top tubes tends to leave two small indentations where the rollers have been if I pull it through more than 45 degrees.
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On the last freedom moped out of Nowhere City.
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klogan45
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« Reply #3 on: October 22, 2006, 08:35:05 AM » |
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Hi Guys,
I'm using a clark bender, and 40mm tube with a wall thickness of 4mm.
Tha problem that I have is that the dies seem to be just slightly too large and not deep enough so that the tube starts to collapse. Thats why i'm thinking that more accurately made dies with deeper walls might help.
Thanks
Take care ride safe have fun
Keith
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Logged
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Confucius say woman who flies upside down has crack up!
He who holds The Angle Grinder of Destiny holds the fate of bikekind in his hands.
Where did that 13mm spanner go then?
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Manky Monkey
Administrator
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Karma: 264
Posts: 55102
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« Reply #4 on: October 22, 2006, 09:28:37 AM » |
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Hmm, the ERW's not the best quality tube in the World -it does what we want of it, but it's only a nominal size. It varies slightly from one batch to the next. Never had a problem bending it though. I once tried some other tube & had to pack the die with duct tape to make it a tighter fit. Could try that. The dies are shallow though & only come up to the centre line of the tube. As I said, it's never been a problem so not sure what to suggest.
Anyone else?
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On the last freedom moped out of Nowhere City.
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reliantman
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« Reply #5 on: October 22, 2006, 11:35:47 AM » |
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Where abouts are you putting the seam inside the metal? Is it facing the die, or outwards?
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klogan45
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« Reply #6 on: October 22, 2006, 12:08:36 PM » |
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Hello all,
reliantman asked where I position the seam, it obviously makes a difference.
The question is ...where should the seam be?
Thanks to all for the help so far.
Take care ride safe have fun.
Keith
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Logged
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Confucius say woman who flies upside down has crack up!
He who holds The Angle Grinder of Destiny holds the fate of bikekind in his hands.
Where did that 13mm spanner go then?
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reliantman
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« Reply #7 on: October 22, 2006, 02:49:20 PM » |
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Keith.
I have dropped myself in it now, as I was going to come straight back and tell you which way, but I can't remember myself. I think the bead has to be against the die, but I am not 100% sure.
I have been on the net all afternoon, and cannot find the answer yet, but I am sure it is there.
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trikerpete
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like a head with a sore bear :)
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« Reply #8 on: October 22, 2006, 04:23:06 PM » |
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We've got a Clark's bender, (about 80 quid from Machine Mart), & use 4mm wall thickness ERW tubing. Seems to bend with no problem, though the 1 1/2" bore I use for top tubes tends to leave two small indentations where the rollers have been if I pull it through more than 45 degrees.
Suggest cutting two "Saddles" from next size up and place ontop of the tube your going to bend and directly under the rollers. "Saddle" = a half section of tube about 50mm long. This helps me when I have that problem. |
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what do you mean, I cant do that !! |
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klogan45
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« Reply #9 on: October 22, 2006, 06:42:16 PM » |
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Hi Guys
Had a go at bending some more tube, tried with seam up, seam down and seam at the side. Its still not happening.
The top goes flat in section and the bottom creases really badly, even with a bend of 45 degrees from straight. The problem is not ocuring where the tube meets the rollers but on the bend itself.
Any other suggestions will be most welcome.
Thanks again,
Keith.
Take care ride safe have fun.
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« Last Edit: October 22, 2006, 06:44:22 PM by klogan45 »
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Confucius say woman who flies upside down has crack up!
He who holds The Angle Grinder of Destiny holds the fate of bikekind in his hands.
Where did that 13mm spanner go then?
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Manky Monkey
Administrator
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Karma: 264
Posts: 55102
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« Reply #10 on: October 22, 2006, 09:27:26 PM » |
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You sure you're using 4mm thick tube? Shouldn't be folding up like you describe. If it creases that easily I'd be a little worried about it's strength for frame building.
Where have you got the rollers positioned? They're adjustable on ours -half a dozen hole positions. We usually use the middle one. Personally I've never worried about the seam position. Can't say I've noticed it's made a difference to the bends, but I guess facing into the die would be least stressed.
I suspect you're not using the same kind of tube we are. How about warming it with a blow lamp before bending?
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On the last freedom moped out of Nowhere City.
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reliantman
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« Reply #11 on: October 22, 2006, 09:58:46 PM » |
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Mostly agree with above. You could try packing it with wet sand, or if you had enough, melt some lead and pour it down the tube, then heat it up after you have finished. The sand is supposed to be better though.
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Manky Monkey
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« Reply #12 on: October 22, 2006, 10:12:23 PM » |
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Plumbers' merchants sell a long coil spring for putting inside copper pipe when you bend it to stop it collapsing, in much the same way as the sand works.
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On the last freedom moped out of Nowhere City.
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Manky Monkey
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« Reply #14 on: October 23, 2006, 10:59:32 AM » |
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We will? Oh right, we will.  |
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On the last freedom moped out of Nowhere City.
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