LR4 Major Z0 vs Z1 height difference at homed pos

LowRider CNC Troubleshooting
1

Hi. I’m working on Z-leveling on my LR4.

While the machine is at z-home, the Z1 side is exactly 1” higher than the Z0 side. I even have the z-end stops adjusted opposite of each other and the adjustment is maxed out to try and compensate. Still, 1” difference is the closest that I can get. I know that 1” is too much to compensate with the Z pull off value.

Wondering what I might have done wrong with the build, or if I used the wrong parts or something. Not sure. The picture of the front of the machine is while Z is at home.

To me this all makes sense since the Z1 side is raised up higher from the surface due to the EMT rail being raised off of the surface. And since both sides use the same length linear rails, and the bottom of linear rails on the Z1 side are higher than the linear rails on the Z0 side, doesn’t it make sense that the Z1 side would be so much higher?

Even if I had more adjustability of the Z0 end stop, if I raised it up the linear bearing would go higher than the linear rail.

If the EMT conduit raises the Z1 side by let’s say 30mm or so, shouldn’t the Z0 side be designed to compensate for that?

I am sure I am missing something.

I am considering adding a 3D printed spacer to artificially lower the Z1 side so it hits the end stop earlier.

See pics below.

Thanks in advance.

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2

Looking at the pictures, you have 2 copies of the exact same XZ plate. They are supposed to be different.

The XMin plate should hold the gantry higher on the plate, because the YZ assembly rolls directly on the table, while the XMax plate should hold the gantry lowers to make up for the different height on the rail. Only one side should have the belt slot cut out.

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It arrears to me that you are using 2 of the lower ones in that picture, intended for the XMin side, and not one of the upper one intended for the XMax side.

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This is the problem - this is an xMin plate not an xMax plate.xMax doesn’t have the belt slot.

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4

Thanks a lot. Glad it is an easy and obvious fix.

5

Perfect. Easy fix. Thank you

6

Where did you get the plates? Ryan or I should not have sent them hopefully.

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7

I got them from the v1e website. But you guys did not make a mistake. I got sent 2 sets, and I used two X0/Z0 plates on a single lr4 build.

3 Likes