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These guides and questions explain advanced milling topics. Make sure you've completed 2.3 CNC Milling with BoXZY before moving on to these guides.

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How do I level my milling plate

So I did the leveling of my 3D printing plate using the 3 spring loaded screws and that worked out fine.

My problem is that when I try to mill, the milling plate isn't level. I have a 2 mill drop from the back of the Boxzy mill plate to the front.

I understand I can face mill a sacrificial plate to counter the angle but, since the milling area of the Boxzy is only 165mm x 165mm, it is not an optimal solution.

So to make a short story long, can anyone tell me how to level my milling plate (not the 3D plate).

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You can drill and thread the sacrificial board in the front and place bolts in the front corners to adjust it like the leveling platform, prior to bolting or clamping it in place, or there's also the option of clamping the sacrificial board over the leveling plate (clamping over or bolting both the leveling plate and sacrificial board to the milling platform, not relying on the magnets to keep it down), which is what I do when I'm in a hurry.

Alternatively, you can cut the sacrificial board down to size and face it, but I realize you probably already though of that.

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Thanks for the great suggestions, but I would prefer a "permanent" mechanical fix to the problem, instead of work-arounds. Hopefully the BoXZY team can supply an answer.

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Im happy when I can help. I should mention, the machine is designed that way. The forward drop is not entirely unintentional. As the Z height is meant (and usually) to be set from the back corner, it was determined it helps to reduce deeper than intended tool engagement on the material during facing (when the back is always the highest point). On BoXZY tramming your mill by facing the sacrificial plate or using the leveling plate is the official method.

https://youtu.be/UettrUe9xbo

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I am new at this so I'll have to accept your answer, but something just doesn't make sense for me. If the milling plate is level then shouldn't the tool engage all points at the same height? Also, If I use a sacrificial plate the size of the original sacrificial plate boxy provides, then only a central square of 165mmx165mm will be level. The outer edges will still be off level so I wouldn't be able to mill anything physically larger than 165x165. If I do use a sacrificial plate of 165x165 and attempt to mill on anything larger than that, I have to be careful how I clamp the piece down or warpage will cause a bad mill. Again please understand that I am very new at this and want to make sure I get it right at the beginning. Thank you for taking the time to help.

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Good question. You're correct, if the milling plate was perfectly level there would be no risk of that (except when your material itself is not completely flat). However, creating a perfectly level surface relative to (and inside of) a moving assembly is extremely difficult (especially when it is allowed to be abused with bolts and clamps, and the distortion they can cause). Even on the the most expensive purpose built equipment out there, you must face or tram the milling surface and fixtures during setup. This is why all 3d printers have either software leveling compensation or a physical method to level a platform with the movement. As there is no one set way to mount the many endless possible sized and shaped work peices for milling, there is no single individual way to level your job (or fixtures) prior to starting. It could be fairly easily done and precalibrated if BoXZY was only intended for one very specific milling purpose, with one individual mounting method (assuming the mounting area did not need to be larger than the area of movement), but that is not the case here.

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I think the oversized sacrificial board may be somewhat misleading. Its oversized because It's meant to be chewed up, cut up, hacked up, milled or screwed into and ruined regularly. Its not, by itself, meant to be a precision flat milling surface, except when milled into to create one. For thin small material, a huge surface like that allows you to create a pocket, which is very useful to keep things down, such as the pcb board in that video. For a larger piece of material that needs to overhang edges you cannot face, you can cut it down to a size that you can face all of, and mount over the top of it. Avoiding warping of the material during mounting is always a point of care you must take when milling. I do not know of any one way to mount various different sized and shaped materials, that are larger than the movement area (on any device), where you will not have that concern. Having lots of scrap wood and plastic to use as sacrificial material for various situations is really beneficial

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