Can someone tell me how to setup and control spindle speed from mach3. My motion control card is AKZ250 and spindle control driver is BLDC motor driver HX-WS400. At the moment i am using a potentiometer to control the spindle speed it works OK but I should like to control the spindle from mach3

The available documentation on the HX-WS400 is almost non-existent but it does appear to accept a 5Volt PWM for speed control. My best suggestion is that you set-up Mach3 to output a PWM on an output pin then try connecting this to your controller.

You may find this thread and the associated links of interest. http://www.machsupport.com/forum/index.php/topic,27447.0.html

Tweakie.