AndyUK's Build - 1.2x1.0m Gantry

**AndyUK** · 11-11-2019

Spent the day thinking about Jazz's suggestions - decided to listen to wisdom :)

The clincher is that it really simplifies the circuits, and I don't have to now work out how to connect the proximity switches I have (NPN NC) in series - I can now just run each back to the controller and have enough input pins to deal with it.

Leaves me needing 5 proximity switches in total - a Positive X limit, two Negative Xs (one each side, doubling as the X homes), a Y and a Z (each doing triple duty). You can see most of them and their trigger plates highlighted in the diagram below.

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**JAZZCNC** · 11-11-2019

Originally Posted by AndyUK

Spent the day thinking about Jazz's suggestions - decided to listen to wisdom :)

The clincher is that it really simplifies the circuits, and I don't have to now work out how to connect the proximity switches I have (NPN NC) in series - I can now just run each back to the controller and have enough input pins to deal with it.

KIS approach works best every time. I've built dozens machines that use this setup without any safety issues. The only time I use separate limits is when using Servo motors because they do just take off when Encoders fail.