Can anyone tell me why this happened? It was a pocket cut clearing a hexagon shape. Using “the beast” from idc woodcraft. Material was glued down. Material didn’t move.
Couple of questions that help us is what were the feeds and speeds as well as Depth of Cut or DOC. I am sure @WillAdams will also link his go to’s that a lot of ppl fail to do and that is avoiding slotting.
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What machine?
Depth of cut?
Feed?
Bit RPM?
All of that will help diagnose the issue.
Assuming that it was a single pass, it might just be too deep for your machine and material being cut.
If not that, then maybe check the set screws on your stepper motors.
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As the above posters asked we need more info. Likely your machine lost steps and got off course. Likely your depth of cut was too much or you had a mechanical problem. Give more info to get a better answer. Looks like walnut which is a hardwood. It takes longer to take less per pass but by having to start over any time you saved with aggressive cutting was lost as well as a loss of the material.
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Where possible avoid slotting and add geometry and cut as a pocket
and/or
and consider leaving a roughing clearance and taking a finishing pass.
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Looks mechanical to me. Belt machine or ball and lead screw?
The more info we know about the machine your using the more we can help.