Cool! Good luck!This has been an exercise in frustration for me over the years I have owned my Grizzly SX3 - there have been many false starts for solutions to spindle and speed control. So the info that Al_The_Man provided earlier in this thread came as welcome news that perhaps using a different off-the-shelf driver would be a viable alternative.
I found an AMC B25A20AC drive on Ebay and bought it - should arrive in a week or so. In the meantime, I have begun to collect wiring information from the Grizzly docs. Here is a diagram showing the hookups to the current motor - I would be interested in any advice on how the AMC should be connected to replace it.
Looks like I will be the guinea pig on this - I have already reached out to Al_The_Man via PM, and he has given me some very helpful starting advice. I will log my results in this thread as I see what happens.
CR.