PSN-L Email List Message
Subject: Re: good leveling screw source
From: "Charles R. Patton" charles.r.patton@........
Date: Mon, 17 Oct 2005 21:42:51 -0700
Roll your own from fine pitch metric screws
pkg.s of 10 M1 x0.25 (1mm) 101.5 TPI screws for $1.31 Australian..
pkgs.s of 10 M1 x0.25 (1mm) 101.5 TPI nuts for $10.84 Australian
(about $8.25 US) or so.
So total cost $10 plus shipping or about a $1 an adjustment point. Find
a couple of Bellville washers and use two nuts per screw to make
anti-backlash versions, although once the weight of the seismometer is
on the screw, it should be pretty much anti-backlash as is.
( I started a Google search with
"80 tpi" screws
and found this in the first page of 10 of 428 returns. So there are
bound to be more.)
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