Photodiode Holder for Bantam Tools Desktop PCB Milling Machine
thingiverse
We wanted to add vacuum on/off control to our Bantam Tools Desktop PCB Milling Machine. While there are a few different ways to accomplish this with CNC machines in general, sensing current didn't seem like a good plan as there weren't any good places to sense it from. However, it turns out there are a series of LED lights visible from the back of the machine, with one corresponding to spindle on/off. This little holder slots into a channel milled in the back of the mill. You just need a photodiode and a circuit to detect when the resistance changes. Parts Needed: * Photodiode of your choosing, it is sized for: NSL-5112 Advanced Photonix
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