 |
 | Home | Contact Us | FAQ | Search & Site Map | Link to Us |
 | Sign In | Join | Other 45 Sites in Network |
| HomeDiscussion Groups General ModelsRailroadsRocketsRadio Controlled Air ModelsHelicoptersLand ModelsWater ModelsModelGeeks.com Contact UsLink To UsSearch & Site Map |
Model Forum / General / Models / May 2007Sizing Driveshafts
Hi, Does anyone here have any information on how to choose a suitable size for a driveshaft? I've Googled it but can't seem to find anything suitable..... Cheers, Michal > Hi, > > Does anyone here have any information on how to choose a suitable size for > a driveshaft? > > I've Googled it but can't seem to find anything suitable..... You need to look at the specs for whatever material you're using, and then do some calculations. Try googling for Module of Elasticity (Youngs Modulus? - it's been a while since I used it), which is a measurement of how much a material will deform, before becoming permanently deformed. Then with a few calculations, decide on a safety factor, and you can then look at sizes/different materials But I'm sure some of the more experienced posters here will probably be able to quote the relevant details better than I can. >> Hi, >> [quoted text clipped - 13 lines] > But I'm sure some of the more experienced posters here will probably be > able to quote the relevant details better than I can. And having just checked, Hooke's Law is the more relevant one, along with yield strength. I'm currently trying to find the link to a website that lists the specs for near enough every metal you can think off, but can't seem to find it just now. Anybody got any ideas? >I'm currently trying to find the link to a website that lists the specs for >near enough every metal you can think off, but can't seem to find it just >now. Anybody got any ideas? http://www.matweb.com Mark Rand RTFM >>> Hi, >>> [quoted text clipped - 20 lines] > for near enough every metal you can think off, but can't seem to find it > just now. Anybody got any ideas? Hi, I'm familar with both but must admit I've never thought they could be applied to radial loads..... I'll 'go back to school' and see if I can work it out, Cheers, Michael On 29 May, 12:21, "Michael" <mQiQcQhQaQeQlQhQiQm...@QbQlQuQeQyQoQnQdQeQrQ.QcQoQ.QuQkQ> wrote: > Hi, > [quoted text clipped - 6 lines] > > Michal Seen on a few cars ...the longest drive shaft has pillbox shaped lump of steel bolted to it about half way along ... this means drive shafts twisting action is stopped or lessened/ damped ...and you can get away with smaller diameters. all the best.mark > Hi, > [quoted text clipped - 6 lines] > > Michal For what? A model? An implement? A truck? Possibly a car? If it's for a car, output and input flanges dictate universal sizes, span of flanges dictates diameter of tube for stiffness... Tom  SignaturePosted via a free Usenet account from http://www.teranews.com >> Hi, >> [quoted text clipped - 11 lines] > > Tom Submarine pumpjet - they're 1.8kW motors so they need some consideration. I'm trying to work out the smallest size I can get away with as they'll have to be Stainless and so $$$ (My keyboard is set to US) Michael > Submarine pumpjet - they're 1.8kW motors so they need some consideration. > > I'm trying to work out the smallest size I can get away with as they'll > have to be Stainless and so $$$ (My keyboard is set to US) > > Michael You still have to provide more information. Beyond the critical speed (depends on material, geometry) you'll get synchronous whirl, for example. > Submarine pumpjet - they're 1.8kW motors so they need some consideration. You need to give the length and the RPM (or torque). Nick >> Submarine pumpjet - they're 1.8kW motors so they need some consideration. > > You need to give the length and the RPM (or torque). > > Nick Oh sorry - I wasn't looking for someone to give me a figure I was curious as to the formula/rule of thumb. No load RPM: 3350 Imperial Torque: 37.6 lbft Length: 19.6" Metric: Torque: 4.248 Nm Length 500mm Michael On 29 May, 22:33, "Michael" <mQiQcQhQaQeQlQhQiQm...@QbQlQuQeQyQoQnQdQeQrQ.QcQoQ.QuQkQ> wrote: > >> Submarine pumpjet - they're 1.8kW motors so they need some consideration. > [quoted text clipped - 16 lines] > > Michael Afraid you will need to calculate again.37.6 lbft do not equal 4.248 Nm`s > On 29 May, 22:33, "Michael" > <mQiQcQhQaQeQlQhQiQm...@QbQlQuQeQyQoQnQdQeQrQ.QcQoQ.QuQkQ> wrote: [quoted text clipped - 24 lines] > Afraid you will need to calculate again.37.6 lbft do not equal 4.248 > Nm`s Sorry I meant lb in Michael > Oh sorry - I wasn't looking for someone to give me a figure I was curious > as to the formula/rule of thumb. [quoted text clipped - 4 lines] > Torque: 4.248 Nm > Length 500mm 4 Nm? Do you have a max OD? I mean, 4Nm is nearly nothing. In terms of "I pick this 20mm tube and it will work". Nick >> Oh sorry - I wasn't looking for someone to give me a figure I was curious >> as to the formula/rule of thumb. [quoted text clipped - 9 lines] > > Nick I'm trying to find the smallest OD I can get away with. Thanks I'll look at that page. Every search I did with Google had 'driveshaft' in it somewhere. Michael > I'm trying to find the smallest OD I can get away with. Weight should not be an issue in a sub, so you can use a solid (cheaper). :-) Nick > I've Googled it but can't seem to find anything suitable..... I have googled for "torsional +stress +formula" and found this: <http://www.ae.msstate.edu/~masoud/Teaching/SA2/chA6.2_text.html> It looks quite complete after a quick browsing through. If you google for "critical +RMP -linux" you should be able to solve the other problem. Nick |
Reply to this Message |
 Sign In
 Join
 My Latest Posts My Monitored Threads My Blog My Photo Gallery My Profile My Homepage Start New Thread Enable EMail Alerts Rate this Thread
|
©2008 Advenet LLC Privacy Policy - Terms of Use
This website includes both content owned or controlled by Advenet as well as content owned or controlled by third parties.