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Do g-code files set project "zero" from the machine's normal home?

Do most g-code files set a project "zero" from the machine's normal "home"?

In other words, do most g-code files EXPECT the CNC head to be PRE-positioned at the machine zero? (x/y in upper/left when looking down).

Or do most expect you yourself to manually set the position of x/y to what you "think" should be the starting position for the project/cutting and then set THAT manual staring location as home via the gcode G92 or G52/G54 commands?

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When 3d printing the machine starts out from machine home. When running g-code from a program like fusion 360 for cnc routing you set the home via G-92 as in the guide. This is what you want as you know where the stock begins and ends and where you set zero in your file. I've tried using the machine zero in xy as a reference for tool changes but not convinced that is the best strategy as the machine homes via a couple of touches of the limit switches. I'm on 3d printing at the moment but plan to get back to milling very soon. For a good overview of making a cam file to send to Boxzy try Lars Christenson

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The Boxzy guide actually doesn’t give instructions on how or when to set the X/Y home, only the Z. I assume that the section entitled ‘Alignment’ was supposed to get into that, but it looks like someone got bored and just stopped . I’m amazed that this hasn’t resulted in a ton of crashed routers considering that two sections later the instructions simply tell you to start print without having set that.

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I'm not sure what you mean. The manual goes into lots of detail specifically about this subject:

Setting User Home for Milling

Mounting Material to Mill on BoXZY

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When you go through the Manual step by step, you get to step 7 where you 0 the z axis, and then step 8 and 9 are running an air pass and then doing what's actually dangerous. You have to go back to the beginning of the section and click on a link to another page to get information that should be included somewhere around Step 6. Once you get used to the fact that most of the helpful info is scattered among the forums and you tube, it sort of makes sense to not have the info where it's most useful to someone with a new machine, i guess...

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Hi Aaron,

The guide is designed to be followed in order. You may have missed the following section in Step 1, which indicated to follow the links prior to moving on to Step 2:

"These steps summarize how to mill on BoXZY. Each step is a link to a mini-manual that expands on the topic in more detail. Before moving on, please read each mini-manual and then complete the instructions on this page for milling a test file"

Step 6 also includes a link to the offset guide should you have missed it prior.

Both the first note and the link are included following the mark designating information ("i" surrounded by a circle). Please let me know if these segments are not prominent enough to be noticed. If they were easy to miss, I can make them more visible to avoid further confusion for new users.

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Here is information on the subject you requested, John’s answer was right on:

Setting User Home for Milling

Mounting Material to Mill on BoXZY

CNC Milling Head Image

Guide

Setting User Home for Milling

Difficulty:

Moderate

20 minutes - 1 hour

CNC Milling Head Image

Guide

Mounting Material to Mill on BoXZY

Difficulty:

Moderate

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