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I hate stainless steel :-)
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<blockquote data-quote="oexing" data-source="post: 142780" data-attributes="member: 1493"><p>Sorry, folks, my calculations above late night were crap. I did not factor in the pi 3.14 in the cross section of the lower spindles so in the end shear load per side is about 3.3 tons, almost 7 tons both ends. BUT all loads are contained in the fork springs and not transmitted by spindles - unless you hit a pothole and the fork hits its stops. At zero trail and rake you´d have no loads in spindles except for roadholding the fork. With trail and rake you get maybe 100 kg per side load for each plain bearing, nothing in way of doubtful stresses in spindles. Someone may do vector force maths in girders if interested but really this is no factor for worries.</p><p> As to bushes in girders, for girdraulics - not my business - maybe someone could try some IGUS or Permaglide bushes. I would, as no grease is required and no rust with stainless spindles a consideration. That minimal friction should not be too bad as you want some damping in the hydraulics anyway, so a fraction of this may come from bushes with no bad effect ? The IGUS material J can be had in rounds for turning up any size you need and after pressing in undersize you can line-ream to no-clearance pushfit fit with spindles. I would not want mini ball bearings as available for some mods. Water can rust them up and ball bearings may just overgloss misaligned fork components with no obvious friction from this. Well, thread drift again . . . .</p><p></p><p> Vic</p></blockquote><p></p>
[QUOTE="oexing, post: 142780, member: 1493"] Sorry, folks, my calculations above late night were crap. I did not factor in the pi 3.14 in the cross section of the lower spindles so in the end shear load per side is about 3.3 tons, almost 7 tons both ends. BUT all loads are contained in the fork springs and not transmitted by spindles - unless you hit a pothole and the fork hits its stops. At zero trail and rake you´d have no loads in spindles except for roadholding the fork. With trail and rake you get maybe 100 kg per side load for each plain bearing, nothing in way of doubtful stresses in spindles. Someone may do vector force maths in girders if interested but really this is no factor for worries. As to bushes in girders, for girdraulics - not my business - maybe someone could try some IGUS or Permaglide bushes. I would, as no grease is required and no rust with stainless spindles a consideration. That minimal friction should not be too bad as you want some damping in the hydraulics anyway, so a fraction of this may come from bushes with no bad effect ? The IGUS material J can be had in rounds for turning up any size you need and after pressing in undersize you can line-ream to no-clearance pushfit fit with spindles. I would not want mini ball bearings as available for some mods. Water can rust them up and ball bearings may just overgloss misaligned fork components with no obvious friction from this. Well, thread drift again . . . . Vic [/QUOTE]
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I hate stainless steel :-)
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