I get that Fusion is frustrating, which is part of the reason I’m transitioning to OnShape. I’ve run into a few infuriating issues with the program myself. The learning curve can be especially steep, but it’s a powerful enough program its definitely worth learning.
Could you please provide the nc file that you’re having trouble with? It’s hard to tell if this is an issue with your machine or the g code. The top of the work surface should be 0. If you’re going into the material, it will become a negative number. If you’re above the surface, it will be a positive number.
I’ve run the GRBL post almost exclusively myself. I’ve been meaning to test the Maslow-specific post myself, but haven’t had the time. If you want to add the Maslow post, follow these instructions. You’ll need to scroll down a little to get to the Mac OS instructions.
There are a couple of things that could be going wrong:
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The Z-Axis pitch in Ground Control is wrong. It could be possible that you need to change your axis pitch to a negative value to reverse it’s direction. If you’ve already run your machine successfully using g code from another program (such as MakerCAM), then ignore this.
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Your work origin is set up incorrectly in Fusion. If you’ve drawn your parts according to the top/front/left/right origin in Fusion, then they will be off by 90 degrees to the orientation you need to machine them. When you’re doing a New Setup, choose the “Select Z axis/plan & X axis”. You’ll then be able to select edges of your parts to set each direction. If your Z-axis is coming out reversed, you’ll want to check the box “Flip Z Axis”. Generally, you’ll also have to flip the X axis as well in order to get the right X-Y orientation, but this is not always the case.
