Rick,
Thank you for a nice clear explanation! This technique was invented in the nineteenth century by Whitworth and was the basis of modern precision machine tool making. Amazing precision can be gained using scraping and the three plate method. Whitworth was an interesting man, one of those that contributed a lot to the industrial revolution. He was working with the same basic tooling and materials (with the exception of Al which came later in usable quantities) as we are!
Many thanks for your clearly explained contributions to this group. I always enjoy reading your pieces.
Regards, Matthew
Matthew TINKER
CNC conversion 1944 Colchester Lathe build-up log
http://www.cnczone.com/forums/showthread.php?t=35519
--- On Fri, 31/12/10, Rick Sparber <rgsparber@aol.com> wrote:
From: Rick Sparber <rgsparber@aol.com>
Subject: [gingery_machines] new article: Making it Dead Flat and Square
To: valleymetal@yahoogroups.com, gingery_machines@yahoogroups.com, mill_drill@yahoogroups.com
Date: Friday, 31 December, 2010, 17:52
"The Machinist's Second Bedside Reader" by Guy Lautard presents a process
for making precision squares from non-precise forms. What I found lacking
was an explanation of the theory behind this process which essentially
creates precision where none existed before.
Those with a fear or even hatred of math have no reason to stay away from
this article. My goal was to engage both the experienced machinist and the
person new to our hobby.
If you are interested, please see
http://rick.sparber.org/df.pdf
Your questions and comments are welcome. All of us are smarter than any one
of us.
Rick
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[Non-text portions of this message have been removed]
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