Before I go to some trouble with a DSO to scope out the board, a practical question first-
Is there a real benefit to remote spindle speed control if you dont have an automated tool changer? Yea, I guess in a pseduo-production process it is one less mistake to be made, but assuming you dont need to adjust speeds mid-path, and that it takes 20x longer to change a tool than it does to change spindle speed, is this really all that necessary?
On the 'regret' thing- IMO digital is often easier than analog, because your PC is speaking digital already. That's not to say buffer circuits arent needed, or even a full microcontroller, but often it is a lot more simple to generate a logic level PWM signal from a uC than it is to try to generate a clean DC voltage from 0-10v (at least, if any current is required).
Im missing something on the speed control, let me know. I might build a simple kit just for fun anyway- but I dont know how much interest (or need) there really is- |