Homing keeps going

Mostly Printed CNC - MPCNC Troubleshooting
1

Hello everyone,

I need some help with my mpcnc. The homing function doesn’t work with my dual endstops. Whenever I enter the homing code or click the home icon in Repetier-Host, the machine continues moving even though the endstops are triggered. I have tested the endstops both in open and closed positions, and Repetier-Host correctly shows the status of the switches. I can also turn the Z position on and off with my plate.

I am using the standard Normally Closed configuration as described in the manual. I usw V1CNC_Rambo_Dual 2.1.1 / 515 and Changed nothin in the configs. I’m using a Rambo board and have followed the wiring instructions but can’t figure out what’s wrong.

PXL_20240731_213300695.MP
PXL_20240731_213300695.MP1920×2550 327 KB

PXL_20240731_213226711
PXL_20240731_2132267111920×2550 332 KB

PXL_20240731_213204044
PXL_20240731_2132040441920×1446 235 KB

PXL_20240731_213145871
PXL_20240731_2131458711920×2550 217 KB

PXL_20240731_213135280
PXL_20240731_2131352801920×2550 282 KB

Any advice would be greatly appreciated.

Best regards

2

Are you sure the X1 end stop and X1 motor match, etc.? That’s the most common issue as long as the switches themselves are responding properly.

3

I once manually triggered all the switches during a 10 cm journey, but none of the motors showed any sign of stopping.

4

I am having the same issue with my lowrider 3. I was looking on here for some post where they added resistors to the board to correct this. maybe that would work here as well… sorry this didn’t help much.

5

That doesn’t apply to a Rambo board, only a very few SKR boards.

This is the most likely issue, mismatched motor/endstop pairs.

Use M119 and verify that the endstop for the X1 motor shows up as such when triggered and queried with M119. Repeat for each motor/endstop combo.

6

I don’t know what I did wrong. I measured all the endstops at least three times and confirmed they were correct. This morning, I realized that the X and Y endstops were switched. I suspect that I visually assumed the X-axis was correct because Y2 is all the way to the right. I can’t explain my mistake any other way. Thank you very much Tom Traband and MakerJim!

1 Like
7

Glad you got it sorted out!

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8

I am using the skr boards that were bought on here preflashed. I can see the light on the board next to the appropriate motor connection light up when I manually trigger the switch.

It looks like I need to add some 1.5K resistors to the board.

9

If you have the crimp connectors and tool, that is a handy way to do it without soldering to the board

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10

I am loving this idea, I was dreading the thought of sodering on the board.

11

We can help you get through that.
Please open a new topic, because you have an SKR Pro and the original poster in this thread has a Rambo. Not even close in terms of boards/problems.

We have several threads where community members with SKRs made pigtails in lieu of soldering.