LR4 has two types of XZ plates. Min and Max. What is the difference?
The belts on these CNC machines need to go around some pretty tight turns. Over time this fatigues the metal and it breaks. Then the belts start to stretch and all the accuracy goes away.
This doesn’t happen with the fiberglass corded belts.
So if you don’t want to loose accuracy and replace the belts often, go with the fiberglass ones.
Mike B.
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LR4 has two types of XZ plates. Min and Max. What is the difference?
Min side has a slice in the top for the belt to pass through. The Max side does not have this cut.
Also, the hole layout is different. 
Yes.
The min side has a groove for the X belt, the max side doesn’t.
The min side rides on bearing wheels right on the table. The max side rides on top of a 29.5mm-32mm rail. The rail lifts the max side YZ plate, therefore the min side must hold the beam higer relative to the linear rails on the min side than the max side. They aren’t the same shape, if you look. The max side XZ plate holds the beam very near its bottom, and the min side on holds it higher. This keeps the beam balanced when the max side sits higher.
They break within about an hour of use.
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dear Ryan, would u you have some time to add details about choosing XZ min/max plate type?
In this image showing the X-min and X-max plates overlapping each other, the X-min is the red line, and the X-max is the blue line.
Are you referring here to the material they are made out of? Ryan has published info in the docs here: LowRider CNC V4 - V1 Engineering Documentation
Here’s a quote from the docs:
XZ Plates¶
The Metal XZ plates can be purchased in the V1E.com shop, or you can find the DXF to cut your own with the printed parts files linked above. Aluminum or steel ¼” (6.35mm) thick material is suggested to work well with the hardware as is. If you want to use thicker or thinner material you will need to adjust the 16 M3x10mm screws to compensate. There is currently no printed option this time.
Does this help with what you’re seeking?
The most primary difference is one gets used on the X-minimum side of the gantry, and the other gets used on the X-maximum side. Their shape is different because the two side assembles ride at different heights (one on top of a Y rail steel tube, and the other not), and one of them has the X-belt passing through it, while the other does not.
The min are the pieces closest to the 0 0 point of the table. I believe He’s using min/max instead of left/right.
What information do you think you are missing?