Hello everyone. I’m new here to the forum. I’ve built a MPCNC PRIMO last year and now am finally getting time to do some work with it. I currently use Fusion 360 personal with the flyfischer post processor. The issue I have is: Since I can only do a single post process operation per tool I come to a problem when after the first operation I no longer have stock available to set my zero in the corner of the stock box as I usually do (I have x,y at 0,0 as normal and a touch probe for z). There is no stock to set my probe plate on. I’m not sure how I can set up my files so I have a spot to zero to start milling after the first operation and tool change.
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What I do is use a section of the stock that won’t be milled during the overall operation for the Z probe location. That way you can reset the Z=0 after tool changes, even if you have already milled part of the stock on previous passes.
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There are a couple of choices, neither of them perfect. As Bartman indicates, you don’t have to use the origin corner for your Z. Assuming the stock is flat, any place where the top exists will work. In addition, you can use a scrap the same thickness as the stock was originally for this reference. As long as you don’t disengage the steppers, you can find the original X,Y origin.
Another solution is to use the spoil board as your reference for the job. I like using spoil board as my reference for any toolpaths that cut through the stock (like contour cuts). This reduces the number times I cut though my stock and into my spoil board. This method is bit tricky since 1) you cannot have the postprocessor automatically insert a G92 X0 Y0 Z0 in the script, and 2) if some of your toolpaths use the top of the stock, you must have a separate Setup in the fusion CAM using the bottom of the stock for your origin stock point.
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