That’s all you really need to know! Read on if you’re interested in the details.īriefly, G28 is used to return the cutter-head to the home position. If omitted, your job might be unexpectedly scaled to a weird size. It sets units to Metric or Imperial, for example. I do not recommend deleting the entire six-line preamble! It sets up various values in Mach 3’s brain, and omitting them may be give unexpected results. This option also controls some related codes at the end of the file. Then open the Properties pane and un-check useG28. It turns out that there’s a simple solution: Click post process to create the gcode. I reverse-engineered the codes in the preamble, but all seemed to be perfectly valid Mach 3 g-code. I was curious about this and decided to investigate. Rama figured out that manually editing the gcode and removing the first six lines gets around the issue. Our next test cut was far more successful.The gcode emitted by Fusion 360 using the default settings does not work on our big CNC. Unlike the other explanation text, this doesn’t mention the setting as a potential compensation to lack of machine rigidity, but it worked. To tell Fusion 360 to take shallower passes, we can select the “Multiple Depths” option. Making full use of all cutting surfaces on the tool is a reasonable default, but that involves removing far too much material at once for our mill. We also wanted to take shallower cuts in the material, as by default Fusion 360 generates code to tell the CNC to plunge into full cutting depth of the cutter. Most real CNC mills in operation today are rigid enough for climb milling, so this was a reasonable default value for Fusion 360 to use, just not for us.
Our machine is not rigid at all by CNC mill standards and must be switched over to “Conventional Milling”. Key phrase in that explanation: This generally gives a better finish in most metals, but requires good machine rigidity. But what if we didn’t even have that much knowledge? Thankfully Fusion 360 included a brief explanation accompanying many settings, including the “Sideways Compensation” parameter relevant here.
We’re not professional machinists, but we knew enough to know this is not a good way to go for this machine. Looking over parameters for tool path generation, the first item we noticed is the default of “Climb Milling”. We now need to tell Fusion 360 how to be kinder to it. We know our project machine, built mostly out of salvaged parts, is not a CNC powerhouse. In parallel with investigating points of weakness within the physical structure, we’re also learning how to make Autodesk Fusion 360 CAM friendlier to hobbyist grade CNC mills.
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