But they can skip. My old instructor kept one in his toolbox. It was smack on
when used to measure a 1" block and off when used on a 2" block. He insisted
on vernier calipers.
I'd go straight from a vernier to an electronic (skipping over the dial-type)
if I was in the trade.
Phil Ethier West Side Saint Paul Minnesota USA
1962 Triumph TR4 CT2846L 1979 Caterham 7
1993 Suburban 1994 Miata C-package 2007 Saturn Ion 3 2.4
http://www.triumphtransamerica.org.uk
http://forum.mnautox.com/forums http://www.flickr.com/photos/pethier
----- "Mark Andy" <marka@maracing.com> wrote:
> From: "Mark Andy" <marka@maracing.com>
> To: shop-talk@autox.team.net
> Sent: Thursday, October 29, 2009 12:17:59 PM GMT -06:00 US/Canada Central
> Subject: Re: [Shop-talk] Micrometers
>
> Howdy,
>
> On Thu, 29 Oct 2009, David Scheidt wrote:
> > Yes. No moving parts. There's a printed pattern on two printed
> circuit
> > boards. A sensor detects the change of capacitance as the two parts
>
> > move relative to each other. With standard PCB fabrication methods,
> you
> > can get something like a tenth (one 10,000th of an inch) accuracy in
> 6"
> > board. Some apparently use induction, but the idea is the same.
> The
> > circuit involved is about a second semester project these days.
> Only
> > precision machining the caliper needs is to make sure it runs
> square.
> > A cheap digital caliper (assuming it's not bent or something) is
> more
> > accurate than an expensive non-digital one. Progress is cool,
> > sometimes.
>
> That's cool to hear. Thanks!
>
> I will say there's one advantage to a dial caliper... If you're like
> me
> and it might sit six months before you grab it to measure something,
> its
> unlikely to have a dead battery.
>
> :-)
>
> Mark
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