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Now a discussion of flip billing wouldn't be complete unless we talked about what we actually need to do to the bed of the CNC machine to get things working correctly. So here's my mock up CNC and you can see that I've added these two pieces of wood down here and screwed them down. And, this is our float jig. Now it's not complete until I go ahead and run a cut on it with a CNC machine. So, I'm going to put two pieces of wood in. I don't know, maybe at least 50% of the length of the stock itself. And we're going to use these to register the lower left hand corner at a particular spot.
You'll also notice that I've screwed this down off center, because I'm going to cut away some of this wood, and I want my screws to be well away of the cut. Now because I can't represent a more complex piece of stock like this in RhinoCAM, I've just mocked this out. So this essentially describes the cut I'm going to make because we've talked about this in two and a half axis cutting, you can either do this as a profiling or an engraving pass. Okay, so I will just do a Boolean subtraction here, or Boolean difference.
And again, I'm just mocking up how this would look if I were to actually cut it. And that's going to give me something like that. So you can see I've carved away a little bit of material all the way down both these edges and it's important that I overshoot as well, because this allows a square piece of material to tuck into this corner. So here's what that stock might look like. And you can see actually that I'm slightly off, so let me go ahead and tuck that guy in. So I'll move from this corner, to this corner, and now everything should be perfectly squared. So, the reason we do this is because you never really know if the spoiler board is set, totally square on the machine.
However, if you use the machine to make a right angle cut, as long as the machine is square, and, you know, if it's not square, sort of all is lost. So we count on the machine square to identify exactly the orientation of how this block of 90 degree stock should look. Okay let's say I tuck this guy in and I also screw him down or clamp him down. Then I go ahead and I mill my first pass. When I'm ready to flip this thing, I'll need to make sure I remember which axis I'm going to flip on. I tend to flip around the y-axis. You can see I've already, ahead of time, placed this little point as we discussed earlier, right in the middle of this face of the piece of stock.
So now I can come in from a different angle. In this case it'll be the front view. I'll type in Rotate and if I have Ortho selected, this will restrict me to a 90 degree operation. I can also make sure that my point O snap is selected. And if you watch in the perspective view, I'm going to go ahead and float this thing over. And if we do this correctl,y we shouldn't see any change, because after all, the way that we flipped it gives it an identical profile left and right. So I was telling you about the Rhino commands, but what I'm really interested here is if you think about the application in the real world.
So, we need to know both how to flip things in Rhino and prepare the RhinoCAM file. But you also have to make sure that you're performing an identical operation on the bed itself, and for that a flip jig is crucial.
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