Limit switches, inertia and controllers

[cropwell]

One very useful trick that is not obvious is to arrange the proximity switches (if that's what you are using) so that the trigger passes by it, not heads straight for it. This means that if the axis does overrun for any reason, it doesn't smash the switch!

Yerss - My MD machine was designed with axial approach to the homing switch. It is too easy to jog onto it and crush the coil. It was an expensive mistake buying a replacement switch from MD as they charged £17 for the replacement (£2 on AliExpress).

The inductive switches such as the LJ12A-4-Z/BX trigger OK on the aluminium of the gantry, but, although they give a supply voltage range of 6 - 36V they need 12v min to operate reliably.

The -4- is the trigger distance