I've been reading about potential cracking of #8 dimples in the tank skin. I've decided to make a test piece out of material if the same thickness. I've drilled the holes #19 and some #18 to test various methods. I have chose to use my alligator squeezer to dimple the holes. I decided that it is in my best interests for a fast dimple rather than go slow. I want to avoid work hardening the dimple by going slow.
Both the #19 and #18 holes dimpled perfectly. No Sign of cracks, although the #19 holes were a smaller diameter after being dimpled.
I decided that with no signs of cracking on the #19 holes (and a smaller final hole diameter) i'll proceed in that direction.
