----- Original Message -----
Sent: Monday, March 06, 2006 6:36
PM
Subject: [PSUBS-MAILIST] viewport surface
finish
Hello All,
I've got another couple of viewport questions for some of you savy sub
builders out there. I've been machining my first flat disk viewport
flange . That A516 grade 70 steel is really hard stuff !! I
was surprised how much more difficult it is to machine, in that you
can't take off as much metal at a time. Anyway I have been doing some of
the final cuts and facing and getting a very smooth surface finish with
higher speeds on the lathe and I have my tolerences very close. But what
I'm wondering is if those surfaces are going to be painted with epoxy will the
very smooth suface finish make it hard for the epoxy to stick?
Should I treat it with muriatic acid before I paint it? And how many
thousandths does the average epoxy paint add up to?
Thanks
Brian Cox, Ventura