Rob Walker Posted February 26, 2003 Share Posted February 26, 2003 Aren`t they just shortened Seirra shafts. These are available at most scrappies for £25 . Link to comment Share on other sites More sharing options...
Dave York Posted February 27, 2003 Share Posted February 27, 2003 Dave E, I keep seeing messages about bulk buy of shafts and then messages about drilling shafts. Which are we doing? If Elite are looking for a pair of shafts to work off of to create a new ligher drilled version, great you can use mine. If they want a pair of the newest to cost out how much to drill them then.... I would have to side with Chelmspeed on the cost of the new shafts then adding the cost of drilling being a tad OTT. Either way they are welcolme to my shafts to use as prototypes. Won't be the newest but 30% savings in unsprung weight is huge!. Whoever said ... If it aint broke, Don't fix it... Just doesn't get the point! Link to comment Share on other sites More sharing options...
Anthony Posted February 27, 2003 Share Posted February 27, 2003 Hi Dave, My car is in bits whilst the engine is assembled. Therefore my new 400 GBP shafts are available. They have done c. 600 miles. If this is acceptable to Elite please let me know. Best regards Anthony Link to comment Share on other sites More sharing options...
edmandsd Posted February 27, 2003 Author Share Posted February 27, 2003 Anthony - This is the ideal solution - Graham's right though 1 will suffice if both are equal length etc..........and Elite will only need it long enough to take measurements etc. This has got to be the best solution as the later shafts are apparantly a lighter/improved design to start with. I was never assuming someone would go and buy a new pair of latest spec shafts just for these purposes - Obviously a new build such as Anthony's car is the ideal solution or someone who's prepared to remove an existing (new) shaft for a couple of weeks. Thanks Anthony I'll be in touch offline. Home of BDR700 Link to comment Share on other sites More sharing options...
Chelspeed Posted February 27, 2003 Share Posted February 27, 2003 They are different part numbers but as far as I know the only difference is one has LH thread on the hub stub axle and one has RH thread. Perhaps someone can lay a tape across a pair to confirm the lengths are the same. Mine are in Bromsgrove at present so I can't. Link to comment Share on other sites More sharing options...
Paul Ranson Posted February 27, 2003 Share Posted February 27, 2003 IIRC the lengths are different. From memory the left is shorter. Paul Link to comment Share on other sites More sharing options...
edmandsd Posted February 27, 2003 Author Share Posted February 27, 2003 Best have them both then Anthony - This is beginning to look less commercially viable ! Home of BDR700 Link to comment Share on other sites More sharing options...
Chelspeed Posted February 27, 2003 Share Posted February 27, 2003 Stick them on the scales too then we have a baseline for the newer shafts. These are the newer ones I presume, the ones with three notches in the metal sleeves at each end rather than plain cylindrical metal sleeves. My diff's in the chassis as is the de dion so I guess measuring diff to ear is as good as measuring the shafts themselves. First job tonight then. Link to comment Share on other sites More sharing options...
Anthony Posted February 27, 2003 Share Posted February 27, 2003 Hi Dave, Lets give it a go anyway ? You are welcome to both Link to comment Share on other sites More sharing options...
Chelspeed Posted February 27, 2003 Share Posted February 27, 2003 Indeed the gap twixt diff and ear is indeed 40mm narrower on the left. Link to comment Share on other sites More sharing options...
edmandsd Posted February 27, 2003 Author Share Posted February 27, 2003 Ok thanks guys - I'll contact you offline Anthony to arrange. Home of BDR700 Link to comment Share on other sites More sharing options...
R2D2 Posted February 28, 2003 Share Posted February 28, 2003 Have been away for a while but the simple equation needed to calculate shear stress in a tubular components is: Shear stress = 16 x T x D / Pi * (D^4 - d^4) T is torque is outer diameter and d is inner diameter. Good Luck with shafts. Link to comment Share on other sites More sharing options...
edmandsd Posted February 28, 2003 Author Share Posted February 28, 2003 Another way of getting to the same answer is: Ssmax = 2T/(Pi * r1^3) for a solid shaft and... Ssmax = 2Tr1/(Pi * (r1^4 - r2^4)) for a tubular shaft where... Ssmax = maximum sheer stress (Psi) T = Applied torque (in-lb) r1 = Outside radius of bar r2 = Inside radius of bar Therefore for a solid shaft with 1.125 inch diameter and 400 ft lb's (4,800 in-lb) applied to it 17,169 psi sheer stress will result, and for the same shaft with a 5/8th inch hole puched through it 18,977 psi sheer stress will result....or only 10.5% more. Cheers David. Home of BDR700 Edited by - edmandsd on 28 Feb 2003 16:20:00 Link to comment Share on other sites More sharing options...
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