Jim, my Radio Carver is the same - I'm the CNC driving mechanism.

My first few runs made for some unique fire wood too.

It does have a drive to duplicate things like gun stocks.  The guy sold it because he was a smith and the drive would be up to 1/16" off for the fine fit details. I noted the chain drive had a lot of slop and no idler to take up the tension, so the solution was an easy fix.