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The encoder rating is 512 for a single turn in quad mode, ie: on your + and - are combined to give 512. This based on spec listed above. I was consider a friction drive around the bottom DOB base. that stays still while the encoder will spin. I myself purchace proper timing belts but did not have a good idler system, mostly experimenting to see if it works. Dur to the complexity of idler system the failure rate for such a system multiplies but the number of connecting parts, ie: belt, 2 x idler, 2 x gears. Friction against another object only give 2 points of failure. Fortunately my ALT encoder only has the single point of failure and exact 10,000 steps.
With DIY it really is a trail an error and that is why it is not taken u by the majority of people. Anyway, circumferance is one way but a simple way is just to divide the diameter/diameter depdnding which gear is driving the encoder.
The encoder shaft is not a good idea to drive on, I have ordered some drive wheels with Urethane tyre to provide friction. I am going to try 3 way to connect.
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