Sprockets

[Justin Beebe at Folsom Tool]

I have an opportunity to design and sell some rear sprockets for motocross dirtbikes. They would be after market parts for Honda, Kawasaki, Suzuki, Yamaha, and KTM. This is a very good opportunity for me because I ride motocross. I was wondering where I can get information on sprocket dimensions and tolerances. Also most manufucturers make the rear sprockets from 7075 T6. I would also like to know why this is the material of choice and if there may be something better to manufacture them from. I'm very new to to this type of work and any imformation would be helpful.

 

Thanks

[Del.]

justin, if you not aware there is a sprocket c hook in mastercam with many standard sprockets

[Justin Beebe at Folsom Tool]

Del,

 

Thanks I will look into that.

[Rstewart]

Yeah I played around with designing a few sprockets; I also ride off road. I didn't know there was a c hook in mastercam, but I'll check on that too.

 

I just googled some actually good info (can't remember the site) on the design and demensions of various pitches.

 

The best sprockets made IMHO are the ones made of 7075 "hub" with just the teeth being abrasive resistant steel.

 

Sounds like a Fun job

[taperlength]

Interesting historical note. The 7075 alloy was developed by Japanese industry in 1936 and used in their fighter aircraft in WWII. Today it is used in all aircraft and spacecraft for high strength-to-weight parts.

[Mark Baker CNC Software]

If you open up the sprocket C-Hook and hit the help button, it will bring up a chart with the standard chain sizes.

[Newbeeee™]

7075 lasts well. 2014 is also ok. T6 for both.

6000 series sucks.

[Leigh @ Kodiak]

7075 T6 is the most common material for a couple of reasons. It is lightweight, and while really this only makes any tangible difference to the top level of rider, weekend warriors like to think it makes a difference to them as well. The other reason is that marketing departments know that the words "aircraft aluminum" sell parts, and words like "solid steel" don't.

 

If I were buying a sprocket, my top choice would be the hybrid style with an aluminum spider, and steel teeth. This style will be much more expensive for you to develop though. My personal choice for sprockets is solid steel. Cheap, and they last forever.

[Justin Beebe at Folsom Tool]

Thanks for all the info the sprocket c-hook looks really good. We use a lot of 7050 and I think it is more exspensive than 7075. That doesn't mean it would be better for this application. If anyone knows the difference I'd really like to hear it.