Understanding Zero Origin with Fusion 360

Discussion about the arduino based g-code interpreter, grbl
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Understanding Zero Origin with Fusion 360

Post by Timmysdad » Thu Jan 23, 2020 9:33 pm

Hi, I am as new and unexperienced with CNC and anything associated with it as one can possibly be - but I'm hoping to change that. I am able to produce acceptable results with my Shapeoko 3XL using Carbide Create but am frustrated with some of the limitations I've run into with the program. From what I've read, Fusion 360 will do what I want so I'm in the process of learning what I can but on my first project I've run into something I don't understand, which I'm sure is very basic and can be answered easily. When I made my sketch in Fusion, I set the point of origin at 0,0,0 (it's basically a 2d sketch). After creating a GRBL file for the Carbide machine, I ran it without an end mill just to watch what it did. Although first, I marked where I zeroed the machine and the spot I thought it would start. (I taped a pen to the router to draw on a piece of paper it's movement). Rather than starting at my 0,0,0 mark, it started about 4.5 inches to the left of my zero. Any idea why?
Thank you, I very much appreciate your input. (I'm an older retired microbiologist that's fascinated with this technology)

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Re: Understanding Zero Origin with Fusion 360

Post by nbrandon14 » Sat Aug 01, 2020 4:55 pm

Don, I'm a fusion and a shapeoko 2 user.

When I use fusion, my modelling coordinates are almost never the same as my manufactuering coordinates. I set my machining zero (and axis directions) in fusion in the manufacturing workspace. Specifically, I find this under "stock".

This becomes quite useful for multi part or repositioned part machining, because you can zero relative to your stock edge or a part feature.

Could it be that you are setting up a machine tool path but have the wrong zero point in your stock setup?

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