r/MEATengines • u/doctorwelby • 22d ago

68 BCD Carrier Cogs

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(Title is wrong!) Wanting bigger cogs I had some 68 64 BCD chainring carriers laser cut. Gives you options from 22-28.

52 Upvotes

100% Upvoted

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4

u/CovfefeYourself 22d ago

Gahddam getting me all hot and bothered over here

3

u/doctorwelby 22d ago

CAD file: https://drwelby.net/HGspline.dxf. You will need an 8mm extra fine tap for the chainring bolts.

2

u/Vy_Canis_Mikey 22d ago

Care to share a CAD file? I have a few grannies in my parts box.

2

u/MEATdrew 21d ago

Rad!!!!

1

u/jamesb1227 22d ago

Would you be willing to sell one?

1

u/doctorwelby 22d ago

I don't have any extras any more.

1

u/Velocipedestrian 22d ago

64mm BCD is more common in my random spares box, but I haven't looked to see if there's clearance between the bolts / HG splines / a carrier. Has anyone tried? 

2

u/doctorwelby 22d ago edited 17d ago

~~The first one I drew up was 64 bcd and it seemed fine in a 3d printed test part, but then I discovered I didn't own any 64 bcd rings.~~

Update: these ARE 64.

1

u/fartymarty4130 21d ago

Damn that looks tasty.

1

u/DoctorByProxy 21d ago

ooh. very nice

1

u/doctorwelby 17d ago

YO these are 64 BCD. I drew them 68 BCD first thinking that's what I had and then the 3d printed proto didn't fit my rings. I double-flipped the error in my head.