Dan‘s gone! He left the 18th of last month, but not before dropping off a present:
A “D&M 4 Machining Center,” an educational model. This last week I’ve been cleaning the mill, and imagine my surprise when I pop the back to find this:
Although the front controls and computer control port were toasted, the power supply was functioning, and after sending a 5V probe into the logic input of one of the motor controllers, we find that the Mill is, in fact, in operating condition! It’s now “feasible” to attempt some repair:
On an up-note, while researching the ICs on the motor controller boards, I found that they have a boolean state for half- or full-stepping (!). The makers of the controller boards even put a small rocker switch on-board to toggle the stepping-mode:
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