A couple of months ago I built my CNC but didn’t end up using it much until now when I started a project that required it. I did some small stuff in wood to get used to the machine and everything worked out great. I then moved onto cutting in styrene and that went well too.
Now I have been using the machine a couple of weeks and I´ve noticed I´m getting some z-axis shift and I cant figure out what changed.
I thing it came gradually so my first idea was that the belts needed tightening. That did not help. I did however have one cable tie snap and I replaced it with another one. Can this be my problem? I replaced it with a regular cable tie.
I have also checked all my grub screws and everything. When the power is on the gantry seems very stable. I have tried chancing end mill, speed and depths of cut.
I did run into one issue, I don´t know if its related to my problem. When I built the machine a cable to one of my end stops seemed flaky and sure enough after just a couple of uses the cable stopped working. I haven´t been able to find a replacement locally yet so I have been homing my y-axis from the controller and then pushing my x-axis manually to the end stops. Things cut straight and circles are round so I don´t know if this can do anything?
For software I´m using Estlcam.
Here is a picture of a wood part showing straight edges:
Another picture of styrene showing straight edges:
And there is my current problems showing the steps:
Thanks for any suggestions!