Seamless tube

[AshG]

i used 20mm because it was what i had look at the top wishbones on a caterham they are about 15mm

Most if not all Kit Car firms use 14swg ERW not CDS

[flyerncle]

Got plenty of ends if you want them Mick,let me know I will fish them out.

[BlaydonBodger]

Thanks guys some great info there

Talon, you say you wouldnt use hydraulic as its annealed yet hydraulic tube gets a mention in the book.... I am just trying to get some perspective here... are you suggesting it shouldnt be used or are you saying its ok but there are better options? I have had a quick look at the specs and tensile strength is comparable to othe rmechanical tubes but yield is quite a bit lower.

Thanks Flyer no doubt I will be pestering you tomorrow if thats ok. It will be good to have a bit of a catch up have made a bit of progerss on that daptor plate.

[flyerncle]

Nice to see you Mick I am there till 5pm so any time.

[Talonmotorsport]

Originally Posted by BlaydonBodger

Thanks guys some great info there

Talon, you say you wouldnt use hydraulic as its annealed yet hydraulic tube gets a mention in the book.... I am just trying to get some perspective here... are you suggesting it shouldnt be used or are you saying its ok but there are better options? I have had a quick look at the specs and tensile strength is comparable to othe rmechanical tubes but yield is quite a bit lower.

I would have thought that when Haynes approved the design of the wishbones some one said that CDS had to be used 'for safty sake' in case any thing fails and they become lible for it. I guess it is intended to stop people from using bits of any old tube that they have laying around which might not be up to the job.
Hyd. CDS is softer than Mech. grade which makes it easier to bend not realy what you want in a wishbone. Don't forget that hyd. CDS is ment to have high pressure oil running through it but not support any toursional load. So although the spec chart shows it as being simular to Mech grade don't forget how it is being used.
All that aside you could use ERW I only use Mech. grade CDS as that's what the book says and it stops any come backs from customers claiming that my parts are made on the cheap with incorrect materials.
At the end of the day it's your time and money and you choose where you want to spend both.

[BlaydonBodger]

Thanks talon, I have a westfield top bone in front of me now and I have to say it is rather light and doesnt seem that substantial. Not sure what its made of but may be as fabby suggested. Will do a bit more pondering before I decide what to do.