EvilElsie Posted July 28, 2018 Share Posted July 28, 2018 O'reet..?? We're lucky enough to have a 'Deep braced JMC swinging arm' and I want to fit some Paddock stand bobbins (actually, what I want is one of those fancy Abba Sky lift things but....). Yes, I could drill and tap a couple of Lugs and ask my mate to weld them on or could I drill and tap the bracing loop directly..?? Can anyone tell me the wall thickness..?? I would really prefer NOT to do either of the above and do something that isn't permanent - maybe clamp on somehow. Has anyone been through this before and can shed any light on it for me...?? Cheers, Dave. Quote Link to comment
CockneyRick Posted July 28, 2018 Share Posted July 28, 2018 (edited) I did the JMC on my Yoshi, drilled & Rivnut in the arm brace. Then screwed bobbins in. Although you have to be aware that the arm brace is not totally hollow box section, it has ribbing in it too, but i managed it Edited July 28, 2018 by CockneyRick Quote Link to comment
philwright Posted July 29, 2018 Share Posted July 29, 2018 Years ago I had a Jota with a JMC swinger fitted, i always used a paddock stand with grippy rubber pads instead of bobbin hooks ,never had any probs. Quote Link to comment
clivegto Posted July 30, 2018 Share Posted July 30, 2018 Pics are of 2 diffrant JMC swinging arm's. Quote Link to comment
Taylor Posted July 30, 2018 Share Posted July 30, 2018 Could you not just use the cups on a paddock stand but upside down under the chain adjuster part so you can still pull the spindle out if need be? Quote Link to comment
EvilElsie Posted July 30, 2018 Author Share Posted July 30, 2018 There's some food for thought Gents - thank you. The very bottom photo is the same as mine (apart from the lengthened Chain adjuster slots). I really like the 'neatness' of the rivnutted, direct to brace approach as used by Cockney Rick - looks good fella... On the other hand, although the welded lug doesn't look as nice you can barely see it with a bobbin screwed home (that's a cool shed Clivegto). I have used 'cupped' paddock stands in the past and i'm not too keen. I'm going to wait until the weekend and go out to the garage with some strong booze, a cigar and stare at the bike until I've made a decision... Many thanks all.... 3 Quote Link to comment
jonny1bump Posted July 30, 2018 Share Posted July 30, 2018 Its never going to fail with welded boss. Quote Link to comment
clivegto Posted July 30, 2018 Share Posted July 30, 2018 Similar idea but a braced 1100 slabside arm boss welded at boss sides. Quote Link to comment
CockneyRick Posted July 31, 2018 Share Posted July 31, 2018 My approach is simple, cheap & no need to weld or remove from frame Quote Link to comment
EvilElsie Posted August 4, 2018 Author Share Posted August 4, 2018 That welded boss looks strong enough to pick the bike up with.... - very neat to. 'simple' and 'cheap' are two of my favourite words. If we add the fact that my daughter is a Sheet Metal Worker at a local Submarine building facility and has access to Rivnuts and a battery powered Rivnut gun then I think we have a winner.... You can't get much simpler or cheaper than getting somebody else to do it for free....... Cheers, Dave. Quote Link to comment
Captain Chaos Posted August 4, 2018 Share Posted August 4, 2018 and instead of buying paddock stand bobbins, I use brake disc bolts. Small, correct thread, strong enough, cheap. 3 Quote Link to comment
jonny1bump Posted August 4, 2018 Share Posted August 4, 2018 I just turned some on lathe actually used stainless totally unlike me stainless is heavy lol. Quote Link to comment
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