dr_jekyll Posted December 7, 2012 Share Posted December 7, 2012 what steel are you guys using on your roll cages? im currently maing one using 2" tube with a 4mm wall. its pretty sturdy stuff but is it overkill? what is the norm for this? Quote Link to comment Share on other sites More sharing options...
Chris Wilson Posted December 8, 2012 Share Posted December 8, 2012 http://www.msauk.org/uploadedfiles/msa_forms/bluebooks/10/160-195%20Competitor%20Safety.pdf OD 42.4 mm 2.6 mm wall thickness. CDS material (cold drawn seamless). DO NOT use seamed tube commonly known as ERW. 4mm is seriously thick and will be daft heavy. Quote Link to comment Share on other sites More sharing options...
dude Posted December 9, 2012 Share Posted December 9, 2012 My old drag car and Daywalker use Chrome Moly tubing, very strong and light compared to CDS and very expensive and has to be tig welded Quote Link to comment Share on other sites More sharing options...
Hartmann Posted December 9, 2012 Share Posted December 9, 2012 if you use Crmo steel you could go down to 1 1/2 inch for the main tubes and 1 5/8 for the secondary tube and they have wall thickness around 0,086inch, it is what we use in denmark for dragsters and it is race legal to 7,5sek passes Quote Link to comment Share on other sites More sharing options...
dr_jekyll Posted December 9, 2012 Author Share Posted December 9, 2012 whats wrog with erw and how can i ll it apart? Quote Link to comment Share on other sites More sharing options...
Hartmann Posted December 9, 2012 Share Posted December 9, 2012 they have a weld seam in the tubes lenght and is not as strong as a seamless tube Quote Link to comment Share on other sites More sharing options...
dr_jekyll Posted December 9, 2012 Author Share Posted December 9, 2012 ok , i take it, it will be inside the tube? Quote Link to comment Share on other sites More sharing options...
Hartmann Posted December 9, 2012 Share Posted December 9, 2012 yes. the seam is a very weak point when you bend the pipe. and is not legal in most race class´s IIRC Quote Link to comment Share on other sites More sharing options...
dr_jekyll Posted December 9, 2012 Author Share Posted December 9, 2012 wow that ds is not cheap, ive found 3.2mm wall x 48.3mm o/d Galvanised steel tube. Specification: 3.2mm x 48.3m o/d x 6.0m (19ft 8 inches) Galvanised ,Tubing to EN39 European Standard i know its not as good but its alot cheaper and it only for a sprin car, not wheel to wheel. it does not say if it is seamed , im assuming it is as it does not say otherwise, Quote Link to comment Share on other sites More sharing options...
Ian C Posted December 9, 2012 Share Posted December 9, 2012 Don't skimp on the cage http://www.mkivsupra.net/vbb/showthread.php?281700-VIDEO-Safety-Pays! Quote Link to comment Share on other sites More sharing options...
Chris Wilson Posted December 9, 2012 Share Posted December 9, 2012 Yes, all seamless will be described in the UK as CDS (cold drawn seamless) unless it's exotic aerospace stuff where they have weird and wonderful namings. Galvanised will be a pig to weld, and there's no way at all none CDS will pass any UK scrutineering checks for a sanctioned event. 6mm wall thickness tube will be mega heavy, and a nightmare to bend. Quote Link to comment Share on other sites More sharing options...
dr_jekyll Posted December 9, 2012 Author Share Posted December 9, 2012 (edited) thats 6m length. 3.2mm wall. a cage is not manditory in the clss i want to run, so im guesing seamed will be better than nothing Edited December 9, 2012 by dr_jekyll (see edit history) Quote Link to comment Share on other sites More sharing options...
Chris Wilson Posted December 9, 2012 Share Posted December 9, 2012 Just check there aren't any regs to say that if you DO have a cage fitted it has to meet "X" specifications before you start spending time and money. Quote Link to comment Share on other sites More sharing options...
dr_jekyll Posted December 9, 2012 Author Share Posted December 9, 2012 will do, cheers Quote Link to comment Share on other sites More sharing options...
dude Posted December 9, 2012 Share Posted December 9, 2012 if you use Crmo steel you could go down to 1 1/2 inch for the main tubes and 1 5/8 for the secondary tube and they have wall thickness around 0,086inch, it is what we use in denmark for dragsters and it is race legal to 7,5sek passes http://www.mkivsupra.net/vbb/attachment.php?attachmentid=161708&stc=1&d=1355076775 Mines legal to 6.5 with unlimited terminal and its light Quote Link to comment Share on other sites More sharing options...
dude Posted December 9, 2012 Share Posted December 9, 2012 Just because you dont have to have one doesnt mean its not nice to know its there. Quote Link to comment Share on other sites More sharing options...
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