Comments on: Taig Milling Machine Stepper Motor and Controller Upgrade http://www.kwartzlab.ca/2011/06/taig-milling-machine-stepper-motor-and-controller-upgrade/ Home of Kwartzlab Makerspace in Kitchener/Waterloo, Ontario Thu, 16 May 2013 04:24:05 +0000 hourly 1 http://wordpress.org/?v=3.5.1 By: karlw http://www.kwartzlab.ca/2011/06/taig-milling-machine-stepper-motor-and-controller-upgrade/comment-page-1/#comment-808 karlw Tue, 28 Jun 2011 03:25:16 +0000 http://www.kwartzlab.ca/?p=1498#comment-808 Thanks Darin! I actually had to make a couple of other changes to get the board running at full speed. The wrong value of capacitor that determines the internal clock speed of each driver chip were used by the manufacturer and had to be replaced with 100pF caps. Another flaw with the board was a current limiting section of the circuit that needed to be removed for each driver chip. These were all minor changes and it was a lot of fun to debug.

]]> By: DW http://www.kwartzlab.ca/2011/06/taig-milling-machine-stepper-motor-and-controller-upgrade/comment-page-1/#comment-794 DW Mon, 27 Jun 2011 00:29:57 +0000 http://www.kwartzlab.ca/?p=1498#comment-794 Karl, that’s so pro! Best project pics, as always.

Sounds like the driver board designer didn’t spec those opto-isolators correctly. You really need fast ones to run at 5kHz (based on your 40 inches/minute at 8000 steps/inch). The debugging you did really illustrates the usefulness of the oscilloscope. I imagine the board is running much more efficiently with a crisp waveform going to the gates on the FETs.

Great job.
DW

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