Originally Posted by Surveyor
I want to install a 1" garboard drain and would like advice on the best bit type for this. I have an Irwin
Speedbor 3 blade
and a 1" hole saw.
Hole saws work much better on fiberglass
than a speedbor. I try to use the bi-metal hole saws as they stand up a bit better than regular steel
, and it's likely the saw will require sharpening after running it through the glass.
Also - drill part way through the glass, and when the center drill pokes out the other side stop cutting, move to the other side and finish the hole from there - you'll get a finished edge on both sides of the hole.