I have a lsd siera diff with a 42 tooth cog attached for a chain drive.
First I am after some sort of ratio calculator for sproket/wheels etc, but more importantly I need someone to make a bigger sprocket.
Chris mason said 54 teeth.
I would prefer a steel one over aluminium.
Any suggestions?
Cheer Martin

If you draw it I can waterjet cut it for you!

I found years ago whilst racing motocross that alloy sprockets lasted better than steel, i'll look on my spare chain drive diff to see who made the sprocket for me.

quote:

---

Originally posted by pathfinder
If you draw it I can waterjet cut it for you!

---

quote:

---

Originally posted by pathfinder
If you draw it I can waterjet cut it for you!

---

if the load is spread around a large sproket, alloy will last just as well as steel..

The chain will be gone a ruin the sprocket before the alloy will wear out...

have alook at the chain drive pages of www.westgarage.co.uk then give Douglas a call. I an sure he can sort something out for you.

quote:

---

Originally posted by K13JOB
have alook at the chain drive pages of www.westgarage.co.uk then give Douglas a call. I an sure he can sort something out for you.

---

There is a company called charles leak and sons in the village of leak in staffordshire. They specialise in gear cutting and have made some gears for me in some very hard metals. Not sure of the number but try yell.com

Try B&C Express here.

Just found this

a dxf will do the job!

quote:

---

Originally posted by macnab

quote:

---

Originally posted by pathfinder
If you draw it I can waterjet cut it for you!

---

What format do you need as I will be needing brackets cut out in aluminium very soon? Would you be able to do that???

---

hmm not sure my old autocad will do those, I'll certainly have a look. ta.

Multiply the chain pitch by the number of teeth you want, this gives the circumference. Divide by pi, this gives the diameter. Draw a circle of this diameter, put a cutout in circumference the size of the chain roller, make a polar array of the number of teeth required, fillet the tooth ends and polay array again, and job's done.

I'd do it for you, but I'm some distance from my cad machine. The pic in the link below will show what you end up with.


Cheers,
Syd.


Bike Drive Assy



[Edited on 26/2/07 by Syd Bridge]

I ordered my sprocket from Douglas at West Garage Engineering today.
He has the pattern for a sierra diff with all the bolt holes. He said it will fit a 530 chain and he will cut it in half so I can change sprockets easily.
He charged me £55 + £6.50 p & p.
Moto racing emailed me. They were about £40 all in, but I would have to draw it and I would have to cut it in half afterwards !