Adding Z end stop

Mostly Printed CNC - MPCNC Advice
1

Hey guys, trying to add an end stop to my Z axis but its proving to be harder than expected. I want to use either the Z min or Z max port and a micro switch for homing purposes. Switch and wire are ran but it seems like I have a firmware issue.

The first time I tested the function it stopped the Z axis appropriately but then ever since it seems like the Z travel when homing has been inverted (heading down into the table). Now it wants to travel down when homing? I think I’m hung up with Z probe settings. As always I appreciate the help guys!

2

Depends on what firmware you have and which way you wire the switch (NO, or NC).

3

I’m running the Rambo 1.4 dual end stop and the switch is currently wired NC like the rest of the switches.

4

Nope, Normally open, z probes start open.

If you want different change the Z logic in the firmware.

5

I changed the firmware logic already, when I went down that road the test Crown plunged up instead of down into the bed. When I return the firmware to its original state the Z home doesn’t seem to be working correctly.

The Z axis no longer homes to its startup location like before. The only way I can get the Z end stop to work is to invert the motor polarity, however this makes the z axis plunge into the air when attempting the Crown. Almost like something is backwards since I tried to make the end stop work.

6

I am unclear to what you changed or what is happening.

I suggest using my stock firmware switching the one wire on your switch and using it NO. It works that way, we all use it that way.

7

I’m able to get the touch plate concept to work NO however I’m not familiar with work flow. How does that work if you’re not cutting conductive material? I was planning to offset the tool paths from its max height. Any suggestions or pointers?

8

Have a look at the “milling basics” page for some more details.

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