When building this new tank with external overflow, I wanted to use
this the Hofer Gurgle Buster, to keep the tank quiet. So while I was assembling the overflow box, I routed out the three holes for the 1" PVC pipe. Snug fit, you really have to push and turn the pipe in the hole.
On RC I have seen this as many others have
Bean Animal's Silent & Failsafe Overflow and decided to incorporate that on to this tank.
Problem is there is a 1 1/8" hole and a hole saw would just skate all over the place leaving marks in the acrylic. So I came up with a simple idea, make a "guide" for the mandrel of the hole saw to slide in. This will keep the saw mandrel or pilot drill steady.
I positioned the guide hole (scrap plastic with hole drilled in the middle) where I wanted the center of the hole to be in relationship to the existing hole (did I say that right?) and used WO #4 to hold it in place. I did this for all three holes.
Picked out the correct hole size for the 1 1/2" BH's and proceeded. It took longer to get the plug out than it was to drill the three holes.
Just an idea for your next build...or fix
first pix is what I currently have
second pix hole guide
third pix hole guide in place
fourth pix weapon of choice
fifth pix hole plug w/guide hole
sixth pix finished results
seventh pix high $$ saw set from Harbor Freight
