Light Machine Corp. Benchman XTr (retrofit)

I have repaired the spindle sensor wires. Ok I ASSUME this is the index sensor for the spindle since it is the only sensor on the spindle. It has three wires, Black, Blue and Brown. Anyone have any information on this sensor and what signals to expect or some diagram that shows how it is powered?

Thanks

That should be a proximity switch and the wire colours should be standard.

steve_a wrote: It has three wires, Black, Blue and Brown. Anyone have any information on this sensor and what signals to expect or some diagram that shows how it is powered?

Those are proximity switch colours.

Brown is power (typically 6 to 30 V)
Blue is 0V
Black is the output.

The black wire will either switch-to-0V for NPN switches (ie, current can flow into the black wire from a higher voltage) or switch to-live with PNP switches (so the black wire will be connected to the brown wire, and will carry the same voltage as that).

NPN is often more convenient as it allows you to operate 5V (or 3,3V) inputs even though the switches are typically powered by 24V.

However PNP works better with Mesa cards like the 7i76 which work on 24V field power.
Experiment is probably the only way to tell which type you have.

Question.... This is a picture of the tool clamp from underneath. There is a screw hole on the rim. Mine came as seen and the question is, "am I missing something here?" Also, I have been trying to read the proximity sensor and I am pretty sure it is working, but it is not sensing anything. I assume it is an index for the tool changer. Is there supposed to be a magnet or a piece of raised metal that it is supposed to detect?

Thanks

Steve

Here’s mine:

Wow! Thank you project_pegasus... yours are totally different than mine! I always assumed they were all the same but I'm guessing you do not have the automatic tool changer. My tool holders have some funky indexing slots and that makes some kind of difference. For me it means the tool must be in a very particular orientation to receive and deliver to the tool carousel. I really appreciate you showing me that. It answers a lot of questions!