How to connect motor with these pieces?

[AlexH]

1. Determine dia of motor shaft
2. Find drill bit of corresponding dia
3. Remove the setscrews from the pulley before drilling
4. Drill out hole on pulley
5. Replace setscrews and place on motor shaft. I often will drill out a small hole the same size of the setscrew in the shaft I am using it on, so it acts almost like a keyway. (Now I don't know how good engineering practice this is but it seems to work)

[DonRotolo]

5. Or file a flat spot on the shaft for the setscrew.

[jason701802]

Be careful with those Gates sprockets, most are not solid and you will destroy them if you drill too large a hole in them. You can look up the model number and the spec sheet should say what the maximum bore diameter is. If you can, chuck the sprockets in a lathe and the drill bit in the tail-stock to make sure that the hole stays centered.