CNC Tech Tip - How to use G28 and G30 G-codes using GRBL

Hey followers, we hope you are all enjoying the Easter break.

In today's CNC Tech Tip we will be covering the usage of G28 and G30 G-code commands and how they help you easily recover from a lost job or change a tool mid job. This is especially important for simpler CNC platforms such as GRBL that lack some recovery features that commercial platforms have.

For those of you who have not setup homing or travel limits on your GRBL controller we recommend checking out this video:

Some key points
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- You do not need to re-home every time (only once when powering up or E-stopping) to use G28 and G30 they can be called at any time in an idle state or while in motion.

- The values persist after E-stop resets, settings updates and power offs.

- Both commands reference there position based on the MACHINE coordinate system and are completely independent of the JOB coordinate space.

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[wwertyg]

You forgot to enter a command on the "G28 XY" button

[jmel]

I would like to use Sharp CNC for PCB work is there any way to surface level my copper board.

[nefertari]

If you have the probe over there at g30 and you make a tool change. The z probing can't be done there if the probe is not on the material? Or is it something I have misunderstood?

[jmel]

Do you have a time frame for your Nighthawk controller I am definitely interested.

[muneebmughal]

How can we program M6 macro for automatic toolchange by using fixed position probe on cnc3d commander?

[kailashmalviya]

How to continue after lost power during job?