Alex Dark Posted December 15, 2009 Author Report Share Posted December 15, 2009 (edited) Alex i have an idea for the brake mounts. Forget the idea of thin seat stays. Instead produce the stays like a normal frame, but machene the bottom part of the brake mount into the top of the stay. That way when the top part of the mount is bolted in, it will be an integral part of the frame. However to do this you need to have a weighty solid seat stay. Of which ihave no solution anyway, i doubt it would work, just throwing up ideas.Ah, I was planning this...but then realised if the axle is used in the horizontal dropouts, the wheel will move in relation to the brake mount That looks like a massive weak point I know Edited December 15, 2009 by Alex Dark Quote Link to comment Share on other sites More sharing options...
trialsmax04 Posted December 15, 2009 Report Share Posted December 15, 2009 (edited) how about mounts like this?Immence paint skills coming into play here....edit: feck just read your last post. erm, vertical dropouts? Edited December 15, 2009 by trialsmax04 Quote Link to comment Share on other sites More sharing options...
monkeyseemonkeydo Posted December 15, 2009 Report Share Posted December 15, 2009 surely it would be able to be welded? hmm..ill check Sorry, my post wasn't very clear. The text below the image refer to the other discussion relating to the BB shell and isn't aimed at the brake mount area/chainstays at all. Quote Link to comment Share on other sites More sharing options...
Alex Dark Posted December 15, 2009 Author Report Share Posted December 15, 2009 (edited) how about mounts like this?Immence paint skills coming into play here....edit: feck just read your last post. erm, vertical dropouts?Got me heart set on horizontal plus...even if it was vertical, if different rims were used the pads may still not hit the rim in line.Sorry, my post wasn't very clear. The text below the image refer to the other discussion relating to the BB shell and isn't aimed at the brake mount area/chainstays at all.Ah no problemo , thanks for your help Dave Edited December 15, 2009 by Alex Dark Quote Link to comment Share on other sites More sharing options...
Alex Dark Posted December 15, 2009 Author Report Share Posted December 15, 2009 Forks here: Quote Link to comment Share on other sites More sharing options...
enima Posted December 15, 2009 Report Share Posted December 15, 2009 Offset needed.. Quote Link to comment Share on other sites More sharing options...
Alex Dark Posted December 15, 2009 Author Report Share Posted December 15, 2009 Offset needed.. heh yes I need to ask my lecturer how to create a plane at a tangent so i can angle the legs away from the steerer Quote Link to comment Share on other sites More sharing options...
aener Posted December 15, 2009 Report Share Posted December 15, 2009 (edited) Are boostered forks really necassary? I haven't heard about any snapping there in a fair while. Do people:a) Not run maguras any more?b ) Not make a big deal of it any more, as it's expected?c) Did the manufacturers already overcome the problem?Not ridiculing in any way - just curious as to the motives.Edit: "b )" without the space becomes . How gay. Edited December 15, 2009 by aener Quote Link to comment Share on other sites More sharing options...
TOBY-E Posted December 15, 2009 Report Share Posted December 15, 2009 Welding aluminium could prove to be fun.if you can already tig weld steel it isnt to difficult welding ally. if you cant tig weld your pretty f**ked really. Quote Link to comment Share on other sites More sharing options...
Alex Dark Posted December 15, 2009 Author Report Share Posted December 15, 2009 Are boostered forks really necassary? I haven't heard about any snapping there in a fair while. Do people:a) Not run maguras any more?b ) Not make a big deal of it any more, as it's expected?c) Did the manufacturers already overcome the problem?Not ridiculing in any way - just curious as to the motives.Edit: "b )" without the space becomes . How gay.If they're reverse mount I reckon it makes sense. I've seen at least 3 pairs cracked at the top of the magura mounts.a ) nope, seems to be in fashion for natty stock riders at the momentb ) People seemed to be ridiculed for posting up snapped forks recentlyc ) To an extent.... Quote Link to comment Share on other sites More sharing options...
psycholist Posted December 15, 2009 Report Share Posted December 15, 2009 (edited) I'm not sure what CAD program you're using - looks like Solidworks - you should be able to put in offset while keeping the forks straight bladed by selecting an axis where you want the legs to join at the bottom of the steerer tube, selecting a plane at the same time and then selecting the 'make new plane' option. Then draw your sweep path along that plane. Works that way in ProE anyway. Straight blade forks are the way to go since putting the same curve on both fork legs will be a manufacturing difficulty depending on the equipment you have handy, and welding the brake mounts to a curved fork blade will be a pain. I'd put the brake mounts on the front of the fork every time. The reason being that by default the back of the fork legs will be in tension at all times except while you're endoing, so the fork will fail more quickly all other things being equal with the mounts on the back. The last fork I used with rear brake mounts was an Echo Urban, lasted all of 6 months before snapping. The replacement Onza fork is still fine 1.5 years on, though it is steel ... Edited December 15, 2009 by psycholist Quote Link to comment Share on other sites More sharing options...
Dr.scratchensniff Posted December 16, 2009 Report Share Posted December 16, 2009 if you can already tig weld steel it isnt to difficult welding ally. if you cant tig weld your pretty f**ked really.I can TIG weld steel and I just find Aluminium to be on a totally different level.That shit is nasty... Quote Link to comment Share on other sites More sharing options...
psycholist Posted December 16, 2009 Report Share Posted December 16, 2009 If you're planning on testing the frame and fork after you build it, here's the relevant European standard - If it can't survive this it'll be dangerous to use as a trials bike anyway: http://www.bike-eu.com/public/file/archive...glish-draft.pdf Quote Link to comment Share on other sites More sharing options...
TOBY-E Posted December 16, 2009 Report Share Posted December 16, 2009 I can TIG weld steel and I just find Aluminium to be on a totally different level.That shit is nasty... its not that different, you just dont get a weld pool, and getting used to dipping the filler wire takes abit of time. Quote Link to comment Share on other sites More sharing options...
Alex Dark Posted December 16, 2009 Author Report Share Posted December 16, 2009 I'm not sure what CAD program you're using - looks like Solidworks - you should be able to put in offset while keeping the forks straight bladed by selecting an axis where you want the legs to join at the bottom of the steerer tube, selecting a plane at the same time and then selecting the 'make new plane' option. Then draw your sweep path along that plane. Works that way in ProE anyway. Straight blade forks are the way to go since putting the same curve on both fork legs will be a manufacturing difficulty depending on the equipment you have handy, and welding the brake mounts to a curved fork blade will be a pain. I'd put the brake mounts on the front of the fork every time. The reason being that by default the back of the fork legs will be in tension at all times except while you're endoing, so the fork will fail more quickly all other things being equal with the mounts on the back. The last fork I used with rear brake mounts was an Echo Urban, lasted all of 6 months before snapping. The replacement Onza fork is still fine 1.5 years on, though it is steel ...Hmm, everyone seems to prefer the reverse mount I'll see i guess. Managed to get the steerer at an angle thanks to you If you're planning on testing the frame and fork after you build it, here's the relevant European standard - If it can't survive this it'll be dangerous to use as a trials bike anyway: http://www.bike-eu.com/public/file/archive...glish-draft.pdfCame through again thanks very much dude, was looking for this for me research Quote Link to comment Share on other sites More sharing options...
Dr.scratchensniff Posted December 17, 2009 Report Share Posted December 17, 2009 its not that different, you just dont get a weld pool, and getting used to dipping the filler wire takes abit of time.That and because it's AC, the heat builds up quite quickly and if you're not careful, you'll put a hole in whatever you want to weld. Quote Link to comment Share on other sites More sharing options...
Dan6061 Posted December 17, 2009 Report Share Posted December 17, 2009 Alex i have an idea for the brake mounts. Forget the idea of thin seat stays. Instead produce the stays like a normal frame, but machene the bottom part of the brake mount into the top of the stay. That way when the top part of the mount is bolted in, it will be an integral part of the frame. However to do this you need to have a weighty solid seat stay. Of which ihave no solution anyway, i doubt it would work, just throwing up ideas.Doing that would be pretty strong, but you've have no adjustment on the mounts at all! So you'd be pretty limited to rims etc, surely? Quote Link to comment Share on other sites More sharing options...
Alex Dark Posted December 17, 2009 Author Report Share Posted December 17, 2009 if different rims were used the pads may still not hit the rim in line.Doing that would be pretty strong, but you've have no adjustment on the mounts at all! So you'd be pretty limited to rims etc, surely?Yerp was my reckoning as well.....It;s still very much on the drawing board though; so any improvements are more than welcome. Quote Link to comment Share on other sites More sharing options...
trialsmax04 Posted December 17, 2009 Report Share Posted December 17, 2009 shouldnt post in here but can you please get in touch alex. Need to know when its okay to have the wheel. Quote Link to comment Share on other sites More sharing options...
Alex Dark Posted December 18, 2009 Author Report Share Posted December 18, 2009 shouldnt post in here but can you please get in touch alex. Need to know when its okay to have the wheel.I'll text you now hombre Final Render of Bottom BracketDifferent Enironment Headtube Rendering Quote Link to comment Share on other sites More sharing options...
SuperDeathMonkey Posted December 18, 2009 Report Share Posted December 18, 2009 (edited) Are you using solidworks? for the CAD? Edited December 18, 2009 by SuperDeathMonkey Quote Link to comment Share on other sites More sharing options...
monkeyseemonkeydo Posted December 18, 2009 Report Share Posted December 18, 2009 I'd still have questions about the BB yoke but it depends how far you need to take it and how clued up the assessor is. Are you actually planning getting the frame manufactured and built? Quote Link to comment Share on other sites More sharing options...
Alex Dark Posted December 18, 2009 Author Report Share Posted December 18, 2009 Are you using solidworks? for the CAD?Certainly am I'd still have questions about the BB yoke but it depends how far you need to take it and how clued up the assessor is. Are you actually planning getting the frame manufactured and built?Erm, well in their eyes its fine as it is....however, as im building it i want it done to the best level possible. Any suggestions you have are more than welcome dave Quote Link to comment Share on other sites More sharing options...
Alex Dark Posted December 18, 2009 Author Report Share Posted December 18, 2009 (edited) edited for immature friends :| Edited December 18, 2009 by Alex Dark Quote Link to comment Share on other sites More sharing options...
monkeyseemonkeydo Posted December 18, 2009 Report Share Posted December 18, 2009 Erm, well in their eyes its fine as it is....however, as im building it i want it done to the best level possible. Any suggestions you have are more than welcome dave Hope that makes sense. Where the chainstays attach it might be worth tweaking it to actually meet the full section of the tubing as at the moment you'll end up with massive stress raisers at the ends of the 'C' section. There are also bits of the yoke edges which don't include a radius. It would tidy it up nicely if they all matched to create a nice, smooth flowing piece. Where the chainstay parts of the yoke meet the BB shell itself I'm still not sure it'll be possible to produce it. If you could smooth the outside edges of the yoke to meet the BB cup ends it would make for an easier to manufacture piece although you may have to rework the lightening slots a bit as well.The final point is probably just an oddity of the display but there seesm to be something a bit odd going on in the slot which passes through the BB shell.It does look proper pimp in full render though! Very impressive . Quote Link to comment Share on other sites More sharing options...
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