T5 Profile

I started with the T5 pulley and belt profile because I need a large tooth to suit CNC machining. But recently I found that the GT2 profile can be drilled with a 1.3 mm diameter bit. Sure the outside perimeter still need to be cut. So I will reconsider the pulley and belt profile later.

Here is the 12 tooth pulley and belt profile that I coded:

The belt is wrapped around the pulley (the red circle is the pitch circle).

Note how loose the fit is! This appears to be part of the design feature:

Other belt profiles (GT2) have lower backlash and should be considered later.

Here is T5 belt profile:

and the pulley profile:

And here is the design:

Here are the calculations:

I will upload the spreadsheet to the file area.

AlanX