[pdjcutandfab]

I need to do a drawing of a sprocket for a customer and I'm having a "moment" here (as I haven't had to draw one of these in a long time). Its a sprocket for a bike (without a derailleur). the pitch is 1/2", the roller diameter is 5/16" and the pitch diameter is around 12". I've done a couple of drawings but neither one is correct (based on laying it next to my sons bike). any help would be great.

Thanks

Pat @ PDJ Cutting

[Fegenbush]

I ran into this problem a couple years ago. Here's a guide to tell you how to draw them:

http://www.gizmology.net/sprockets.htm

Fegenbush

[Les A W Harris]

I need to do a drawing of a sprocket for a customer and I'm having a "moment" here (as I haven't had to draw one of these in a long time). Its a sprocket for a bike (without a derailleur). the pitch is 1/2", the roller diameter is 5/16" and the pitch diameter is around 12". I've done a couple of drawings but neither one is correct (based on laying it next to my sons bike). any help would be great.

Thanks

Pat @ PDJ Cutting

This Help? 75 teeth, 12.2667" OD/ 11.9401" PD,




76 teeth, 12.4258" OD/ 12.0992" PD.




Cheers, Les.

[Kiwi]

Les. Your drawing for the 76 teeth shows the 75 tooth dimensions.

[easymike29]

Look here

http://idleamusements.com/Software/sprocketeer2.htm

Gene

[pdjcutandfab]

Thanks for all of the info, I actually did a version 3 last night and it looks pretty close to what Les did, but i'm going to download that sprocket program and see what results i get from that.

Thanks again to all

Pat @ PDJ

[universalfab]

Hey Pat, let me know what the number of teeth, pressure angle, pitch, outide diameter, root diameter, root radius, and tooth corner radius and I can send you a cad drawing.

[Les A W Harris]

Thanks for all of the info, I actually did a version 3 last night and it looks pretty close to what Les did, but i'm going to download that sprocket program and see what results i get from that.

Thanks again to all

Pat @ PDJ

I downloaded it something is not right, no compound radii. OD too large, seating curve too small. Sprockets are quite forgiving it will probably go round!




Cheers, :cheers: Les.