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| Motorbike question... |
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| AdeV:
....I'm not a motorbikist by any stretch of the imagination.... but someone's asked me to turn up what is, I think, a swing arm support; at least, it has a bunch of bearings on it & is bolted end to end. He wants it 28mm OD for most of the width, with a ~25mm section turned down to 20mm, and central 17mm bore all the way through. The question is, what should I make it out of? The customer reckoned just boggo steel; I'm not sure whether to use stainless or not... Any ideas from the two-wheeled fraternity as to what would be a sensible choice? I can draw a C-o-C if required. |
| Jonny:
Do you know if its using a through bolt or not? ie long bolt and thread or nut at the other end. How long? Some wheels have a steel floating insert to reduce the flex of the through bolt with the bearins pressed in to the aluminium or magnesium. Most swing arms new and old have one bolt either side threaded in to the frame with bushes or bearings. Need more info could either be something compressive to stop collapsing as in cock on length or as above reduce flex with an M16 bolt and play. Either way that dia is going to weigh, it all adds up. |
| Brass_Machine:
C-O-C if you will. But it all depends on what it is going to be used for. It almost sounds like a spacer to fit a swingarm from one bike to another, where the bolt is going to be small on the bike receiving the swingarm. Definitely need more info, because if it is the above, need to take in account what the bolt is made out of etc... I posed a question like this to the frame list I belong to. They have members from some of the elite in motorcycle frame building. With a little more info, I can give you the answers. Eric |
| AdeV:
No problem, one C-o-C coming up: Because my writing is atrocious, I figured I'd better write about it too... Basically: it's a cylinder. The 17mm bore had a bolt that passes right through it, & clamps the piece into place. At least 1 (maybe 2?) bearings ride on the outside of the main diameter. Another bearing rides on the 20mm diameter, this is held in place with a 7mm wide x 28mm dia spacer, seen to the left. The whole thing is 230mm long. The current piece, which is too short IIRC, is made of "steel" - not sure what kind. I'd planned to use either EN1 or 330 stainless, depending on the recommendations made here. |
| Brass_Machine:
I am going to assume it is a spacer of some sort. One to take up the gap left between a smaller pivot bolt and a larger through hole on the swingarm. Since the swingarm is riding the bearings and not the spacer, steel should be just fine. Personally for corrosion etc... use stainless. Hope that helps |
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