Hi Ron
Some time back I built a lathe with a wood base,it worked good.
But it had it shortcomeings,one day it worked fine ,the next day it was
funcky.
I guess the humidity in the Florida Panhadle made it swell and shrink.
Keith
Deep Run Portage
Back Shop
" The Lizard Works"
--- On Tue, 1/25/11, Ron Thompson <ron@ourcadguy.com> wrote:
From: Ron Thompson <ron@ourcadguy.com>
Subject: Re: [gingery_machines] Re: new article: How Accurate is Your Micrometer?
To: gingery_machines@yahoogroups.com
Date: Tuesday, January 25, 2011, 8:27 AM
On 1/25/2011 9:01 AM, Rick Sparber wrote:
>
> Shannon,
>
> You ask a very good question that has no answer. It is sort of like
> beauty.
>
> I know people that define accurate as better than 1/8" while others
> that define it as better than 0.0001". I try to talk about getting the
> best possible accuracy rather than an absolute number.
>
> Rick
>
>
>
I took a 2 year machine shop course at a local college. One of the
things I learned was to take my expectation of accuracy from 1/8" to .001".
In woodworking, 1/8" is acceptable and you can't get much more accurate
because wood changes with humidity. Metal, not so much.
I tried making wooden stuff to a higher standard, but was dismayed when
it stopped working due to swelling. Tolerance and clearance do not mean
the same thing.
--
Ron Thompson
On the Beautiful Florida Space Coast, right beside the Kennedy Space Center, USA
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