Dave,
You mention getting within +/- 0.002" with a caliper. At least for my level of skill, I think that is about right.
You also say "But these would be real world applications." I assume you are comparing what a professional can do versus a hobbyist. This is an interesting topic because a professional is making a living, is under deadline to get their job done, and is usually not out to just have fun or prove anything.
A hobbyist is usually not out to make money, is only under self imposed deadlines which can be moved, and hopefully IS out to just have fun or prove something. So I claim that a highly motivated and skilled (and maybe slightly nuts) hobbyist can get better results than a highly skilled but sane professional. This is particularly true if making only one part and being able to keep trying until it comes out right.
Rick
-----Original Message-----
From: gingery_machines@yahoogroups.com [mailto:gingery_machines@yahoogroups.com] On Behalf Of David Patterson
Sent: Tuesday, February 01, 2011 4:39 PM
To: gingery_machines@yahoogroups.com
Subject: Re: [gingery_machines] Re: new article: The Intersection of Art and Precision
Jim using these calipers with a rule is alive and well, in the professional and hobbiest areas. I have the 4" and 6" spring tension type and the 10" of the screw tension and the trammel points that get me to any size I need. All starrett too. Required tools in a patternshop and for turning, wood or metal. A starrett rule has a tolerance of +/-.001" per inch, that's close enough that you should not need a gage block, now you just need a good eye. When using a shink rule you have no choice, you have to use a rule, unless you want to calculate every dimension. Anything closer than .015" you should be using something that requires less "feel" than these calipers. These can be used to check clearance between parts but that too is a visual thing. I'm sure if you want to take the time you can get quite close, but that only works at home. In the work place +/- .010 to .015" is close enough for this style of caliper. to check clearance you might be able to get
to +/- .002". But these would be real world applications.
Dave Patterson
odd_kins@yahoo.com
http://home.comcast.net/~oddkins/foundry_home.html
http://groups.yahoo.com/group/gingery_machines/app/peoplemap/view/map
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