HBM-BF25 conversion finished – some extras

The conversion of the HBM BF-25 to CNC is finished ! I added home/limiting switches to all three axes. (X/Y/Z) Due to how Mach3 works, I’m able to control these 3 switches, by one I/O port on the breakout board. I still have a few input and output ports left.

So, after this conversion, I wanted some add-ons. First one was to be able to not only turn the motor on and off (already done), but also I wanted to control the motor-speed of the spindle. The spindle-motor in this machine, is a DC 200V/800W motor. I ordered a PWM module, to control the speed of this motor, by Mach3. The PWM module was so cheap, that I couldn’t build it myself. You can use the module with a regular potentiometer/knob, but also by a pwm signal, comming from the Mach3 breakout board. (1 output port is enough) A light-sensor acts a a rotation counter. (connected to an input board) So Mach3 is able to control the speed and direction of the motor, but also able to read the rotation-speed, so it can “adjust” the PWM output accordingly.

Furthermore, I bought a wireless pendant, XHC HB04. This is the perfect pendant, and much better then the other pendant I had … Another nice add-on, are the LED ring-lights I found on ebay (the are actually sold as LED rings for BMW cars) They use 12V, and do fit perfect over the spindle itself.

This entry was posted in Blog, Electronics, Mechanics. Bookmark the permalink.

Leave a Reply

Your email address will not be published. Required fields are marked *