Mapping X/Y G-code to cylinder on A-Axis

mapping x/y g code to cylinder on a axis this is useful if you have a 4th axis and want to mill on the outside of a cylinder as if it were the x y plane you must have set up the a axis as “4thmill” this is possible with a normal xy g code file edingcnc will perform the mapping for you some calibration needs to be done to make this work it is done on the coordinates page the location of the a axis rotation point needs to be set and also the radius of the workpiece needs to be set first first, we set the location of the a rotation point we move by jogging or mdi to the center point of rotation of the a axis, only z and y are important here press button " 1 set to current position " done, center is set next, we set the outside radius of the workpiece there are two possibilities to do this 1\ just type the radius if you know it and press " set radius " 2\ we move the z up touch the outside of the material with the tool bit and press " calibrate radius " calibration is done first, we need to be sure that our y axis is at the correct position before we switch on the y >a mapping we need to do this now because when the mapping is on, y can no longer be moved, as y is now mapped to a you can press " move y to rotation point ” to do the movement the mapping can be switched on now then, we can load a standard g code file with xyz coordinates below, we see how it looks in the graphic position the x and the z at the zero point of the drawing, so where the milling should start now zero all axes in the operate screen important zero the z at the top surface of the cylindric material, in this case, the material has a radius of 20 mm, so the z zero is 20 mm higher than the centerpoint y to a mapping off //image of flat picture y to a mapping on