2 holes drilled and NO broken glass!
My drill bits came in this afternoon and ran into the LFS and bought myself 2 bulkheads. I scaled back my designs a bit and decided to drill 1- 1.5" bulkhead and 1- 3/4" bulkhead. I plan on having a modified coast to coast over flow covering 2 thirds of the tank and centered. The 1.5" bulkhead is on the far left and the 3/4" bulkhead is centered. The first hole I drilled was for the 3/4" bulkhead. It was easy! Surprisingly easy! The 1.5" bulkhead hole was a little more challenging for 2 reasons. First the bit is huge and without a guide the bit liked to walk around on the glass, alot! The second reason, which probably contribute to some of the first, was my bit was not exactly straight and square. It had just enough of a wabble that it made it a little challenging and stressful when it came to the last mm of glass. All in all drilling glass is not as hard or as stressful as some warned. I would do it again.
Here are a few tips.
I was sitting in a chair and was able to prop my elbows against my knees for stability.
When drilling make sure you are in the low speed setting and start with very low RPMS with even light pressure to get you going.
-Jason