It is simple simple. Draw a Ruler in Cad. A 10" by what sub divisions you
want. Print it on the paper you will use and with the same commands.
Take paper to table and with a precision scale measure the drawing ruler.

First the long 10" then 5" then 2.5 and down see what you get.

Make it 1:1 and print normally - e.g. some printers have size to fit. NO.

Martin

On 3/25/2019 5:12 PM, Jim Wilkins wrote:
"David R. Birch" wrote in message
...
On 3/25/2019 7:39 AM, Jim Wilkins wrote:
"Martin Eastburn" wrote in message
...
How can you tell. Print it out at what scale ? and what
precision.
Don't guess and measure with a ruler. Use a mouse and the CAD
file
and
have the Cad program measure it. CAD might scale a Tabloid into
11/17 with
3/8 borders or anything. It is relative. When 1:1 you normally
use
D and E size paper
and make sure the CAD is printing at only 1"=1" or 10" or 5 or
some
even number.

Cad fits a drawing into the paper size and the scale of ink vs
Tube
vs planned is always off.

Martin


The X and Y scales of a paper print may differ because separate
mechanisms control them.

I posted this question almost 6 years ago and I don't remember
whether I got any response.

I received AutoCAD compatible files from a customer, either DWG or
DXF, I don't remember which. The files were fractionally
dimensioned, but when I checked the dims in AutoCAD, as we always
did with customer CAD, I found the discrepancies as described above.

There was no hard copy involved in this.

David

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Maybe the points were manually "digitized" from a paper print.
https://en.wikipedia.org/wiki/Graphics_tablet
"It can also be used to trace an image from a piece of paper which is
taped or otherwise secured to the tablet surface."

"These digitizers were... bundled with PCs and PC-based CAD software
like AutoCAD."