AndyUK's Build - 1.2x1.0m Gantry

[JAZZCNC]

Why 2 switches on each axis if they are traveling.? The point of having traveling switches is to lower the number of switches.

All you do to use 1 switch is set the same input number for each Limit IE: X Lim (++) = Input 1 and X Lim (- -) = 1. X Home = 1. Then when Switch sees the target at each end it trips Both Limits, It doesn't matter which Limit shows on screen all that matters is that it trips when triggered.
When it's homing it ignores limits and looks for the Switch trigger.

Regards Sloped Target then it's not needed for proximity switches. Just needs to see the metal target, However, it is better if switch passes over the target rather than butting up to it.

Also, you don't need 3 switches on Each X-axis. Only need 3 Switches for Both sides. X2 only needs a Home SW it doesn't need Limits the other side deals with Limits.

[AndyUK]

Why 2 switches on each axis if they are traveling.? The point of having traveling switches is to lower the number of switches.

All you do to use 1 switch is set the same input number for each Limit IE: X Lim (++) = Input 1 and X Lim (- -) = 1. X Home = 1. Then when Switch sees the target at each end it trips Both Limits, It doesn't matter which Limit shows on screen all that matters is that it trips when triggered.
When it's homing it ignores limits and looks for the Switch trigger.

Thanks Jazz, didn't realise you could use the same switch for both limit and home! I can see two advantages to using two switches; it means the limits can form part of the safety circuit, and I'm not sure I like the idea of needing software to guarantee a stop.., and on the off-chance I have a faulty home switch or messed up homing sequence, I'm still protected (which is hopefully the only situation that I'm headed towards the limits blindly).

Clearly needs more of a think :)

Regards Sloped Target then it's not needed for proximity switches. Just needs to see the metal target, However, it is better if switch passes over the target rather than butting up to it.

Cool that saves some shaping.

Also, you don't need 3 switches on Each X-axis. Only need 3 Switches for Both sides. X2 only needs a Home SW it doesn't need Limits the other side deals with Limits.

Good catch - clearly not with it yesterday :) That is what I've drawn in the circuit diagram, just wasn't thinking straight when playing with CAD...

[JAZZCNC]

Thanks Jazz, didn't realize you could use the same switch for both limit and home! I can see two advantages to using two switches; it means the limits can form part of the safety circuit, and I'm not sure I like the idea of needing software to guarantee a stop..,

It depends on how you look at it.? Limits are not really a Safety or E-stop situation, they are a positional error not really an emergency situation.
For instance, the most common limit trip isn't because machines run off on its own accord but rather because you jogged into them or set Work zero too close to limits. In which case the Software will warn you and won't allow when soft limits are turned on. However, having to reset the drives every time you jog into a limit soon becomes a pain and on small machines, this happens a lot when first learning.
Also your not actually relying on software with the UB1 or better controllers because the controller's hardware actually stops the motion and then informs software it's happened.