From: "Richard Erlacher"
<edick(a)idcomm.com>
To: <classiccmp(a)classiccmp.org>
Subject: Re: Shoddy Hardware (Was: Re: WW fixtures (was Re: "New"
PDP-8))
Date: Tue, 2 Apr 2002 21:19:45 -0700
Organization: Erlacher Associates
Reply-to: classiccmp(a)classiccmp.org
If you buy a tap, be sure it's a
"roll-tap," which (a) doesn't cut the
shavings you'll never get out, and (2) displaces the metal, thereby forming a
better thread in what little sheet metal there is.
Same thing if have decent self "roll-tap" screws saved for this
purpose. If I need to form threads in chassis sheet, oil the screw
and screw away with screwdriver.
There's crappy roll-tap screws had been rolled using crappy
metal or too brittle rod. This gives rough thread and cracks that
makes shavings and can strip easily.
Cheers,
Wizard
Dick