4/16/2021 0 Comments Okuma Cnc Programming Tutorial
The setting has to match between what the CAM produces and what the controller or simulator expects.
Okuma Cnc Programming Tutorial Code Controllers OnlyOther than the fairly exotic ability to follow a NURBS path, most g-code controllers only support two kinds of motion: linear and circular.Circular interpolation is quite a bit more demanding on your machine as two axes have to be precisely coordinated. Drawing a complete circle involves not just coordinated motion but reversal of direction at each of the 4 quadrant points. These would be the points corresponding to 0, 90, 180, and 270 degrees. If the machine has any backlash at all, it will be obvious at these reversals because there will be a glitch in the cut there. The current control point, or location when the block is begun establishes one endpoint. In other words, if we add the I value to the starting points X, and the J value to the starting points Y, we get the X and Y for the center. In this case, our circle has a radius of 2, so the g-code might be simply. But, the CNC teachers in the world will suggest that you should prefer IJK. Their argument is that when you use IJK, you get a double check that your arc is correct. Once it has the centers coordinates, it can check that it is equa-distant from both end points. The check of each of those two distances is the double check. In the case of the R format, the controller has no such double check. I say go with whichever approach makes sense for your particular situation, but you should definitely be familiar and comfortable with both. Youre going to need to be comfortable with relative coordinates anyway, as theyre darned handy. In general, the rule is supposed to be that if you have both IJK and R in the same block, R takes precedence and IJK is ignored. But there are controllers that dont work exactly that way, so be sure you know whats going on. ![]() Many controls also have the option for IJK to be the absolute coordinates of the center. When using a control set up like this, you can just keep issuing XYZ commands for arcs without having to define a new center each time. Its not clear youll save much thoughhow often do you want to do a bunch of arcs with the same center. Whatever the last R used was, the controller remembers and uses that value again if no R is given. For example, a pocket might have arcs for the corners that are all the same radius. But this option allows you to change that precedence to IJK if your controller works that way instead.
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