blair
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it looks bigger in water ! !
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« on: October 31, 2008, 10:48:46 AM » |
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hi all just about to start another project chop and was sourcing some stuff and tube for the frame .
does anyone know what ERW tube stands for ?
as i have managed to get 28 mm od x 24 mm i.d seamless hydrolic tybe ( CFS )
does anyone know the differance other than the seamless bit and is it good to use ?
cheers
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« Last Edit: December 15, 2009, 02:55:17 PM by blair »
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Manky Monkey
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« Reply #1 on: October 31, 2008, 11:54:35 AM » |
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Electrical Resistance Welded, (ERW), tubing
ERW tubing can be an ideal choice when strength to weight ratio is critical, or when bending, flattening, flaring or other types of fabrication will be required. For many applications –including prop & drive shaft tubing, steering column components, recreational equipment & valve casings –ERW tubing offers significant cost savings throughout the fabrication process.
Because of it’s excellent workability, scrap loss is minimal. It’s uniformity & concentricity mean lighter walls can be specified, reducing the allowance for stock removal. ERW tubing is available in a wide range of wall to diameter ratios & can be manufactured from pre-coated steel.
Cold Finished Seamless, (CFS), tubing
Suitable for general hydraulic applications.
Cold Drawn Seamless, (CDS), tubing
High quality steel, used in the aircraft & racing industries. High specification, suitable for high impact applications.
-we use ERW cos it's perfectly good enough for our needs & is relatively cheap, (I paid 20 quid for 3 metres of 3/4 inch bore a few days ago). It bends in a hydraulic bender very nicely as it's soft enough to form, whereas the much higher specification CDS tends to be more brittle -it creases or flattens rather than bending. Always lots of discussion on forums as to what's best. Basically, if you're planning on going racing, scrutineers may well insist on CDS, but for normal road use, ERW's fine.
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On the last freedom moped out of Nowhere City.
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blair
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it looks bigger in water ! !
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« Reply #2 on: October 31, 2008, 02:30:10 PM » |
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thanks for that MM but is the CFS good to use ? or do i need ERW .
the tube i got was through a work contact so cost to me £0
on i dont think i could go racing even if i wanted to not with my eyesight mind you might be intersting to watch
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« Last Edit: November 08, 2008, 05:00:59 PM by bummer »
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Manky Monkey
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« Reply #3 on: October 31, 2008, 02:39:07 PM » |
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 Never used CFS & can't find much info on it on t'web. Most of the arguments you see on builders' forums are between CDS & ERW. Anyone have any experience of CFS? (don't they sell sofas?)
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On the last freedom moped out of Nowhere City.
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dracken1
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« Reply #4 on: November 03, 2008, 05:12:08 PM » |
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like cds cfs is available as cfs1 and 2. i can never remember which is which but one bends better than the other and the other welds better  we mainly use t45 tubing £22.00 per metre odd thing though is that 1.25" is £22.00 per metre and so is the 0.75"  |
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blair
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it looks bigger in water ! !
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« Reply #5 on: November 07, 2008, 12:51:02 PM » |
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thanks Mr D . as i kept the original bottom rail and front engine mounts the only bends i am making are very shallow for the rear end - bottom rail kick ups and back of the rear frame so i dont see any problems, but its always better to check
cheers
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blair
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it looks bigger in water ! !
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« Reply #6 on: November 08, 2008, 05:01:59 PM » |
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just to let you know myself and dod had a go at bending the rear bottom rails and the tube is perfect , cheers for the advice
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Manky Monkey
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« Reply #7 on: November 08, 2008, 05:45:13 PM » |
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Let's have a look then!
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On the last freedom moped out of Nowhere City.
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blair
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it looks bigger in water ! !
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« Reply #8 on: November 10, 2008, 04:21:48 PM » |
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ok ok dont get pushy mr M im a very busy person you know ( not ) here you go , looks good to me already and ive on done the bottom 2 , the string is purley a guide for the back bone not for structural integrity |
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Manky Monkey
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« Reply #9 on: November 10, 2008, 05:33:16 PM » |
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Ooh! A proper jig n everything. That's proper posh! Very nice Mr B.  |
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VALLEYSBOY
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sheep shagger
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« Reply #10 on: November 10, 2008, 07:24:38 PM » |
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nice one Bummer |
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More metal than skin
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blair
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it looks bigger in water ! !
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« Reply #11 on: November 11, 2008, 10:01:15 AM » |
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why thank you mr M . i thought i wold do a proper job this time and make my own frame as the last time i just fixed an existing one.
i shall post more as i go
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Manky Monkey
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« Reply #12 on: November 11, 2008, 05:32:19 PM » |
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Yuss please. |
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On the last freedom moped out of Nowhere City.
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blair
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it looks bigger in water ! !
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« Reply #13 on: November 12, 2008, 01:33:08 PM » |
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Manky Monkey
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« Reply #14 on: November 12, 2008, 05:40:25 PM » |
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Ain't it nice when you get a bit of good luck for a change. You lucky ol' thing you. |
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On the last freedom moped out of Nowhere City.
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