You could use a weak key, or actually drill a hole through the shaft, and through the sprocket. Then a sheer pin would go through it. It would hold up under normal acceleration, but not under motor lockup and extreme torque. Used lots of places. We'd use them in robotics at my last job, in case the head came down on a solid object, it wouldn't strip gears.
On 8/10/07, dale henderson <[EMAIL PROTECTED]> wrote: > my knowledge of such things is limited, is a sheer pin a weak key? will > this sheer pin hold up to torque of the motor? > > Travis Gintz <[EMAIL PROTECTED]> wrote: > Why not put the sprocket on and lock it in place with a sheer pin... > that way if it does lock up, its going to shear off the pin, and not > break anything else. > > > On 8/10/07, dale henderson wrote: > > i agree with you, but i can't imagin the bidirectional being cheaper. i'll > > try to find some other alternative. i think using two bidirectionals could > > get close to $1900, plus two good DC PMs for $1500 more and a good > > controller [regen] $600+. thats $4000 while an AC system of the same power > > is about $5000 > > > > speaking of alternatvies does any one have any input on what would happen > to > > a belted torque converter if the motor locked up? would it slip? > > > > > > Bob Martin wrote: > > > > > > I like the bidirectional so you can still use regenerative braking. I'm > > kinda paranoid about motor lock-up too, but I don't want to give up the > > regen. > > > > ----- Original Message ----- > > From: dale henderson > > To: ElectricMotorcycles > > Sent: Thursday, August 09, 2007 1:43 PM > > Subject: Re: [ElectricMotorcycles] More on motors > > > > > > for the MT-130 and MT-60 make sure you check the max rpm for the driven > > [i.e. the motor] i think those are only rated for 1500 and 2600 rpm, > > respectfuly. also check the price! i did find something that would snap > > right on to an etek and would work up 3600 rpm its the FSO-400 from > > formsprag > > [http://www.formsprag.com/PDF/P-956-FC_pg014-015.pdf] but > > their list price was $800 [dealer $500]!!! > > > > "Seth A. Keel" wrote: > > > > This is a good company for freewheels. They are probably who I will > > order from, but it's not all that clear what's what from their website. > > The sales rep suggested the MT-130B, but that's too big, so I think, > > like explained in the last message, that I'll turn the drive shaft down > > to 3/4" and go for the MT-60, though I'm still not sure what the > > difference between the A B and C versions is. I assume it's mounting > > options. Hopefully, I can call tomorrow to clarify and possibly order. > > http://www.hilliardcorp.com/overrunning-clutch.html > > > > > > Albuquerque, NM > > http://geocities.com/hendersonmotorcycles/blog.html > > http://www.austinev.org/evalbum/1000 > > http://www.austinev.org/evalbum/1179 > > http://www.austinev.org/evalbum/1221 > > http://geocities.com/solarcookingman > > ________________________________ > > Luggage? GPS? Comic books? > > Check out fitting gifts for grads at Yahoo! Search. > > > > > > Albuquerque, NM > > http://geocities.com/hendersonmotorcycles/blog.html > > http://www.austinev.org/evalbum/1000 > > http://www.austinev.org/evalbum/1179 > > http://www.austinev.org/evalbum/1221 > > http://geocities.com/solarcookingman > > > > ________________________________ > > Looking for a deal? Find great prices on flights and hotels with Yahoo! > > FareChase. > > > > > > > > > Albuquerque, NM > http://geocities.com/hendersonmotorcycles/blog.html > http://www.austinev.org/evalbum/1000 > http://www.austinev.org/evalbum/1179 > http://www.austinev.org/evalbum/1221 > http://geocities.com/solarcookingman > > ________________________________ > Fussy? Opinionated? Impossible to please? Perfect. Join Yahoo!'s user panel > and lay it on us. > >
