http://tncscooters.com/index.php?route=product/product&path=52_55&product_id=55
Those have a 42 pitch sprocket on them and they are cheaper. I bought mine from TNC Scooters. In the listing they say 3000 RPM, but that's what the motor is spinning without the gearbox. Nominal speed is around 400. I mated mine with a 10 or 11 tooth sprocket. Basically whatever I found that kept the ratio as close to 1:1 as I could find that fit on a 5/8" shaft. Some of the guys have bent 1/2" drive shafts so I stepped up to 5/8". I suck at math so I'm sure someone will chime in on that. Derek On Tue, Dec 4, 2012 at 9:49 AM, Andy Kipp <[email protected]> wrote: > Derek, > > Thanks for the input. I've actually been thinking about this a bit > after your comment. The motors I am using > (http://www.monsterscooterparts.com/24v-350w-motor-dirt-quad.html) > have a metric ISO 05 (8mm pitch) sprocket. I can find sprockets with > that pitch easily enough, but nothing with a 1/2 bore (obviously a > metric sprocket has a metric bore). What might be a cheaper option, is > to keep the 20 tooth sprocket that the motor comes with and buy the > ISO 05 sprockets and just bore them to 1/2" for the drive shaft. I > have a 1/8th keyway broach already so it shouldn't cost me anything > other then the cost of the sprockets. > > This brings me to a second though: what do people typically use for > their drive ratio? The motors are geared down to 375RPM, so with a > 1.25:1 drive ratio (25/20), thats about 300RPM on the drive axle. My > track sprockets are 4" in diameter, so thats a top speed of ~315 fpm > (3.6MPH), is that too slow? (my math may be wrong, or I may be > misunderstanding the physics here) > > On Tue, Dec 4, 2012 at 6:30 AM, TyngTech <[email protected]> wrote: > > Yep. Frank has the broach and has been providing sprockets for several > > years now. > > > > ST > > > > > > On Tuesday, December 4, 2012 1:39:14 AM UTC-5, [email protected] wrote: > >> > >> I thought some of the east coast guys were already doing this sort of > >> thing? > >> > >> Derek > > > > -- > > You are currently subscribed to the "R/C Tank Combat" group. > > To post a message, send email to [email protected] > > To unsubscribe, send email to [email protected] > > Visit the group at http://groups.google.com/group/rctankcombat > > -- > You are currently subscribed to the "R/C Tank Combat" group. > To post a message, send email to [email protected] > To unsubscribe, send email to [email protected] > Visit the group at http://groups.google.com/group/rctankcombat > -- You are currently subscribed to the "R/C Tank Combat" group. To post a message, send email to [email protected] To unsubscribe, send email to [email protected] Visit the group at http://groups.google.com/group/rctankcombat
