Submersible Build Log

Elec. Through Hulls


Here I have machined the electrical through hull and drilled it out to the tapping size for 3/4 inch UNF which I think was 17.5 mm.  Then with everything still chucked up in the lathe, I started the tap by hand.  The machine was not switched on, I just turned the chuck by hand.  This gets the threads perfectly straight down the bore.  I only tapped it out a few turns just to get it started.