Quote Originally Posted by cropwell View Post
My little play kit is an arduino with a TB6560 to drive a stepper and a couple of relays. Project 1 is the Air/Spray/Mist cooler idea and project 2 is a spindle cooler with a small liquid volume closed circuit with a pump and radiator, controlled by a thermocouple in or on the spindle. This would also display the spindle temperature.

Here's a photo of the bits - Click image for larger version.  Name: DSC01921.JPG  Views: 264  Size: 710.3 KB  ID: 19681
Well the project I'm working on is to start with an analogue mechanical machine. I have a couple of arduino + PWM boards and a robotics setup for RasPi.. ATM want to KISS the project. But if I can get it off the ground then I'll definitely be asking you for more advice on adding a more accurate control system, especially to steadily increase the RPM's. Heats not a problem as it has a water dripper for cooling. I'll use the spare DC motor controller and attach it to a small 3 inch fan to cool the other controllers.

Quote Originally Posted by Neale View Post
...and to clarify, you just need one of those pulse generator modules, which can drive three of the cheap stepper drivers. That way, all three motors will run at the same speed.
Already order :)
TB6560 CNC 3A Router Single 1 Axis Controller Stepper Motor Driver Module
( 301199977453 )

Quantity: 3

Stepper motor driver controller Speed Regulator Pulse Signal Generator module
( 252475644118 )