Sorry for the dumb questions, but it has taken a bit of effort to get this far and I really don't want to destroy the machine before I've done any real work with it! And this first test will be run with the stepper motor couplings disconnected and the cutter removed!! I'm not sure how Fusion360 can use this though - do I have to add a line of g-code along the lines of G54 X300 Y200 Z80? In which case where do I add it? Or does Mach4 use the G54 info I put in to sort out where the cutter actually moves to before it starts running the Fusion360 code? At this point I'm setting G54 in the Mach4 dialog, so the DRO's display the offset (lets say that X Y and Z show 300, 200 and 80 for example). I have started by homing the spindle and zeroing the X,Y and Z axes, followed by manually jogging the cutter to the corner of the stock. Loading it into Mach4 the preview of the path shows that the tool is going to describe some large arcs at three of the corners - possibly the lines which include I and J codes such as G2 X105 Y51 I101 J51.Īm I right in thinking that this is because I have added or omitted something in one of the F360 dialogs at the manufacture setup stage? Maybe something to do with lead-in and lead-out?Īlso, I am confused on setting up the work origin. I drew up a 100x50x4mm cuboid in Fusion360, and generated the g-code file attached below. I have seen This Thread, but I don't think this is related.Īlso, here is a video showing the machine in operation.I've got to the stage of attempting a first run with my cnc router. What is the reason for this? Can't it run counterclockwise the same as clockwise? Is this to due climb cut vs normal cut direction concerns? The jerky clockwise pattern has alternating G2 and G1 commands. If you look at the g-code (attached), you can see that indeed the counterclockwise path issues a G3 up front, then just a bunch of x/y coords.

It is steping along the arcs one little bit at a time with pauses in between. The resulting g-code willįirst cut the larger diameter in a couterclockwise motion which is very fast and smooth, then it will cut the inside dimension with a couterclockwise motion which is slow and jerky.

Here I have selected an oval shaped pocket and a 1/4' bit.

HI all, I'm trying to understand why one of my toolspaths runs (or rather, is generated to be) jerky when on the machine.

Cnc router fusion 360