Viewports

24/01/08

I first put down a taper tap to get the hole started.  This is the awkward bit where you have to make sure that its vertically straight down the hole.  Next I put down a plug or bottom tap.  These taps still have a point at the end due to the way they are made, so I ground the tip off on the bench grinder in order to get right down to the bottom of the blind hole. 

Submersible Build Log