Howdy,
On Mon, 2 Nov 2009, David Scheidt wrote:
>> And I believe I did think about it. I came to the "accurate measurements
>> party" pretty late and therefore everything I have is digital. A mechanical
>> vernier caliper may not have any way to set the zero datum but all of my
>> digital ones do. So I have naively set the zero as needed and gone about the
>> business of getting what appear to be accurate measurements - i.e. things
>> fit together when I am done - without any problems.
>>
>>
> One of the things that I use calipers for is to transfer a measurement
> from one part to another. I'll measure the size of a hole, and then use
> the external jaws to mark a piece. I'd throw away any caliper that
> required me to read the measurement, close the jaws, set the zero point,
> and then reopen the jaws and set them to a particular measurement, which
> I'd've forgotten by this point. The guy who taught me to do this (and
> also how to read a vernier caliper) was a tool maker for decades; it's
> standard practice when making things where absolute measures aren't
> important, just that things are the same size.
Well for Pete's sake, so would I! "Mark the piece" particularly from the
jaws of a caliper, is hardly an accurate operation.
I suppose this makes a little more sense as a go/no go measurement though,
which could be accurate.
mark
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