RADBMX.CO.UK
Technical & Reference Section => Tech and Restoration => Topic started by: BossHogg on September 17, 2007, 08:04 PM
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Hi all,
I've got this set of single pinch Redline 401's. Bit of rust here and there but pretty good nick overall.........well apart from this crack in the non-drive arm. :(
(http://www.radbmx.co.uk/archive/albums/bb318/jameshogg71/DSC01126.jpg)
(http://www.radbmx.co.uk/archive/albums/bb318/jameshogg71/DSC01123.jpg)
Anyone know if this damage can be fixed up and made good enough to ride on again? The crack looks to be in a pretty tricky spot alright. Could be some issues with any repairs being put under tension in that spot right there, i dunno.
Any expert opinions appreciated.
Cheers - Jim :daumenhoch:
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Im sure that could be fixed if you know a good tig wilder, but it would take a bit of work to get it looking right :-\
Or even a good tig welder ;)
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I recon it could be repaired for show purposes, but I wouldn`t like to ride on them :(
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i recon super super glue would do, well worth repairing though, good luck
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that should repair ok,the crack would need to be veed out then tig welded,then the thread would need to be re-tapped ;)
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Be careful with a re-tap if it get's drilled again for the thread you'd lose too much of the original metal and then have to go up a size and knob about with different hardware for that side. Try a little weld and get it filed and polished out then a rechrome.
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No tapping there surely? It must be a clearance hole.... Tapped thread is on t'other bit ;)
As for the repair, stick it in the post to Fuzzynod, have his mate repair it, then I'd say ride on it no worries :)
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just noticed it was on the non thread side :D
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yes, well spotted :LolLolLolLol:
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I had a crank arm rewelded (not a 401). The weld was spot on but the heat distorted the spindle boss and it didnt fit over the spindle!! Just a little something to watch out for.
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Before you go to the expense of welding and rechroming, there is usually a good supply of orphan arms on ebay, might be a cheaper route :daumenhoch:
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there is usually a good supply of orphan arms on ebay
Does this thread, and this comment, answer the "which is better, flights or profiles?" Question?
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Aye, does a bit don't it?
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Cheers fella's,
Plenty of food for thought there :-\
Any ideas on cost of repair and a re-chrome vs cost of an orphan?
I was lookin to use the cranks for a rider but if there's any strength issues, maybe not.
Might just be best looking for another arm what with the cost for repair and re-chrome, and if the thing does warp from the heat and won't fit the spindle then it's neither use nor ornament eh?
Shame not to try a fix though.......
.......Bugger :buck2:
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Another arm is of course the easiest fix, but for a rider you could always just weld the thing and not bother about a rechrome. It'll hardly notice really. As for the heat distortion, the right welder will keep this to a minimum. Also as the splines are so very coarse, I suspect it'll always fit without much hassle ;)
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I have a pair of 401's that the arm completely snapped off,which I welded back on without rechroming,doesn't get used but I would use for everday riding no jumps etc.The repair for yours would make any difference to the strength of the crank,I don't think :daumenhoch:
(http://)(http://www.radbmx.co.uk/archive/albums/b375/nogoodthis/DSCF0429.jpg)