Lowrider 3 CNC Basic Setup Questions

LowRider CNC Troubleshooting
1

Hello!

I recently converted my Lowrider 2 CNC to the 3 version. I have a couple of questions.

  1. Is the firmware the same? I am using Marlin 513DL 2.0.9.2

  2. When I home the Z axis using the V1 Custom Menu> Home Z Axis command, it only registers one of the Z axis endstops, specifically the z_max, and then it triggers both Z servos to stop. Is this normal?

  3. Is there a Z probe command that will register a zero and then pull the Z axis back a specific offset? I can only get it to work using G38.2 Z0 where it stops at the probe.

Thank you for the help!
Lindsay

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2
  1. That should work. The current version is 515DL for the low rider.
  2. Can you check the endstops with M119? You probably have a wiring issue.
  3. You have to combine some commands. G38.2 for probing. G92 to set zero and G1 to move up (which should be easier now that you know the zero).
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3

Thank you so much for your reply! Really appreciate the answer to #3, I will use those commands.

I have a new issue that I’m sure there is an easy fix for. I downloaded the 515DL firmware for the Rambo like you mentioned and am trying to flash it using Platform IO. I’m sure there is something really simple and dumb that I am not doing, but now the screen is just bright blue and blank. Is there a tutorial on how to do this easily? I’m pretty new to everything, so I would need all the steps on how to flash.

THANK YOU!

4

Never mind about the firmware! I used Arduino instead and it worked like a charm. Still having the Z stop issues though, Z2 doesn’t stop with the Z2 endstop being triggered. Both Z steppers stop when the Z1 endstop is triggered. I checked with the M119 command, and every endstop is working well.

If anyone has any fixes, would love to hear it :smiley:
THANK YOU!

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Nice work!

6

I’m not sure but this sounds like an issue with what’s wired where. ??

7

I will check everything again. Just to clarify, the Z probe is in the X Max endstop port, and the Z endstops are in the Z max and Z min ports, correct?

8

Just guessing…

The SKR Pro 1.2 has 7 motor connectors on board, labelled X, Y, Z1, Z2, E0, E1, E2.

These should be connected:

  • X to the X motor.
  • Y to the Y1 motor.
  • Z1 to the Z1 motor.
  • Z2 should have 2 jumpers shorting the A1/A2 and B1/B2 pins. This port is wired in series with the Z1 port and is controlled by the same stepper driver. I surmise from the reported behaviour that you are using this for the Z2 motor, which is incorrect.
    I believe the RAMBo has 2 Z ports wired in parallel so no jumpers on the Z2 port.
  • E0 to the Y2 motor
  • E1 to the Z2 motor.
  • E2 should be empty.

Other boards often have 2 Z ports on the same stepper driver as well, since this is a common configuration for 3D printers, such as the i3 and its numerous clones.

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9

Since you are on Rambo, while I am on SKR Pro, I’d probably best defer to someone else to answer that…

10

THAT’S IT! Z2 needed to be on E1! Can’t thank you enough!

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