Clear Board Sensor

[Digitalwoodshop]

In the picture you can see where the arch cut path lift the bit at the brass roller leaving a un cut area about the thickness of the tabs.

[Lrupri57]

Is that what system error 81 is, a cut out warning. On my original error , "Clear Bit Sensor" is that why the machine would not go any farther, because it knew the cut edge was too close to the brass roller? After correcting the edge on the project and flashing the memory card to 3.0 I did not get the "Clear Bit Sensor" warning and the machine proceeding to carve. I'm tempted to upload the original project again to see if I get that error again, it would be nice to know. I seen where some people mentioned sensors and a mirror having something to do with that error, I never found the sensors or mirror on my two machines. Go figure...........