Hi all, my name is David McKay, and I'm in the process of converting an Industrial Hobbies manual mill to a CNC (Mach3 of course), partially using their kit, and partially my own experience with Automation and Control systems. I started out in the late 80s doing Automation programming for manufacturing facilities, although I haven't done any programming in 10 years at least. My reason for doing the conversion, and in fact for getting the mill in the first place is because I have a few ideas about creating some experimental aviation performance parts, AND I really just want to hobby it up a bit.
Anyway, I'm going to use cnc4pc's step and direction board to talk to a vfd, and will probably use one of my old plc's as a modbus slave for certain aspects of control of the system. As I'm sure most of these projects are budget based (as is mine), I would like to get a recommendation on a spindle speed detection component to provide a closed loop speed control system. I'm currently planning on taking the speed reference off the top of the spindle shaft, since I've got about 5 inches exposed on the top of the head.
I will also post this as a new topic in General Mach Discussion.
Thoughts and recommendations?
David