My attempt to build the perfect plane first time out has met a new snag. In countersinking the tank skins, I'm getting scratches about the diameter of my bit. They seem to appear at random. I'm using a single flute #40 bit with an air drill. Clean the shavings from the bit after each hole, they still appear.
Any ideas?
Jerald
RV-8A Tucson
Any ideas?
Jerald
RV-8A Tucson