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Help with a sprocket

Frunple

Plastic
Joined
Feb 23, 2015
If I asked someone to draw up a 48 tooth sprocket for a 530 chain, would anyone do it? I'm asking btw.

Reason is, I just cut one using the same teeth I used on another gear and it isn't fitting. Not sure what I did wrong but I wanna see if I can salvage the gear by cutting a little more off of it or if it's just too far gone.

So I need a 48 tooth gear with a 9.87 OD and 9.11 ID for a 530 chain. I'm not giving any values for the 530 because I think that's where I screwed up and hoping someone here knows more about chains than I do (which is pretty easy to do!).
 
48 tooth 5/8" pitch sprocket is 9.911 OD, 9.156 (bottom of the gullet). Your numbers are off a hair, but not much. I've probably got a drawing but it's at home, can check later.

and yeah, blank sprockets are cheap, why cut one?
 
Sprocket teeth are different shape than gear teeth. They are epicyclic rather than involute. The teeth are a bit more pointed. With the proper cutter you can probable salvage the piece. See Ivan Law's book on gear cutting or Machinery's Handbook for more information.
 
Couldn't find a flat sprocket anywhere i looked. Not a solid, flat one anyway, need to cut a design into it to match the rims.

Didn't try sprocketeer but will.

I'll check out Ivan's Law.
Thanks all.

I'd still like that drawing Skarsaune, Just to compare to mine and see if I can make it work. If you don't mind looking for it.
 
used to make a lot of sprockets for the honda shadow motorcycles from Martin plate sprockets, in the 36 to 39 tooth range. cost per raw sprocket was in the $20 range. plain steel not hardened. these come with a 1" center hole. Martin stock# 50A48, if this would work for you.
 
FYI i do this all the time, especially early in the morning on repair jobs. Secret is your not making a gear!!! Stop thinking you are, because your not!

Your makeing a 48 sided "hexagon" each side the length of the chain pitch. Make each pocket fit the radius of the roller + some clearance (i use 4 thou on the roller diameter), radius each tooth off as if the chain straightened on a single link. (think chain pitch - half roller diameter) Don't make the teeth too pointy as the teeth tops only serve as a guide to getting the chain into the route of the tooth.

This may not be text book optimal, but you can take any chain and make a real nicely fitting and working sprocket. Even part worn chains not a issue in the slightest it just changes your pitch a nats:-) You can make the sprocket fit.

Whats more you can do it at silly o clock with just a cnc converted bridgeport, simple cad and simple cad cam, you don't even need a calculator as you can do it all with ofsets in cad. From any bit of plate - old sprocket you have to hand. With any diameter cutter smaller than the roller diamiter.

Did i add you can charge the silly o clock surcharge on the job too :-) because even the OEM is 3 days away by post :-)
 
Wow! I'll cut it myself. Rebel Gears wants $78 for a blank. Wouldn't even consider the shipping on the other site, coming from the UK.

So sprocketeer works wonders! Problem is I don't see a reason that mine isn't working. Other than the OD, it's almost the same.
I'll have to keep digging I guess.
 
We were buying in volume, can't remember the exact supplier, but our cost was much less than that, for sure.

I'll see if I can't dig up the drawing tonight.
 
I have a profile i drew for 520 chain if that is any help? Sprocket was laser cut for that and has near on 270 degree of wrap and works fine.

Attach your dxf profile on here and i will have a look at it - tell you were i think its wrong, its less effort than drawing from scratch.
 
If I asked someone to draw up a 48 tooth sprocket for a 530 chain, would anyone do it? I'm asking btw.

Reason is, I just cut one using the same teeth I used on another gear and it isn't fitting. Not sure what I did wrong but I wanna see if I can salvage the gear by cutting a little more off of it or if it's just too far gone.

So I need a 48 tooth gear with a 9.87 OD and 9.11 ID for a 530 chain. I'm not giving any values for the 530 because I think that's where I screwed up and hoping someone here knows more about chains than I do (which is pretty easy to do!).


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