Nearly crashed my denford triac machine and not sure what went wrong, help please?

[suesi34e]

Hi all,

I nearly crashed my machine and have no idea how. Perhaps one of you guys may have some idea what went wrong. I was cutting a circular pocket in the plastic as per the photo. The plastic is 50mm thick I had cut 25mm deep fine in a series of 7 passes, it went fine I then cut another 25mm deep zeroing the z 25mm below the top of the part that was fine but I had not got quite deep enough so I had another go on the 6 or 7 pass things went wrong real quick.
The only thing I can think is perhaps I touched my mouse or shuttle and it override the code if that is possible. The part was secure in vice so it did not work loose. I have tried the code again directly above the part 3 or 4 times I would think and all seems fine. Perhaps one of you guys will know where I most likely went wrong. It dived into the bottom right part of the job an tripped the machine which was very lucky

Thank for any help

Suesi