Steve,
Thanks for the help. I don't know what I was doing the other night, but the voltage was dropping with increased rpm. I checked it tonight and it seems to be working okay. Pulley ratio does not have an effect, but that shouldn't matter because the signal is proportional to the max voltage. In my example, a max rpm of 7200 on the pulley config will output the correct 7.5V at for an S5400 command.
There are a couple of limitations. First of all, it appears that the minimum signal is 1V, so you can't go less than 10% of your max speed. Secondly, commanding the maximum speed causes an error on the Galil. If you want a 5000 rpm top speed, enter 5001 in the configuration.
Right now, I am just bench testing. I have a new lathe with a Dynapath Delta 50 that I am working on now, so the mill conversion will have to wait a few weeks.
Mike