Calibration of Plotter and Overlays

J

JHagani

#11
Originally Posted by JHagani



What instrument do you use to measure the grid?

No one can ask for less than .010" tolerance when inspecting using a Mylar.
We have a calibrated 48" Calipers to validate the grids within .001"
 
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Satellite

Involved In Discussions
#12
Or as it has been done for years, include 5.0" or 10.0" grids in your Mylar.
Plotters may draw a small circle nice and round, but the accuracy tends to decrease over longer distances.

The problem gets worse with an older plotter with worn out paper guides.
It is not only the feeder guides that wear, but the stretch and relax during the heating cycle for a printer vs. the plotter stretch on the feeder.

We put target points at the screen limits on each overlay so they can all be inspected in both directions to ensure that the plastic has not been streched during printing. We also verify a grid on a monthly basis to ensure that the printer elements are ok. Also each batch of mylar is reviewed to determine what the differences are and if they impact the overlays. The same is true of inks, since some smear easier than others even in a "dry" environment.
 
T

TIMMYS - 2010

#13
You can purchase comparator scales from Optical Gaging Products. The scale is a linear scale but it is transparant so that you can place it on the overlay. There are scales for each magnification. You can also calibrate the radius of the overlay by using the comparator and gage balls.

Optical Gaging Products are located in Rochester, NY.
 

greif

Involved In Discussions
#16
re: why not tighter cal of Mylar film.

Mylar (aka stabilized polyester, Estar) changes size a lot with humidity (around 8 mils in 10 inches for every 10% RH change, and less with temperature (around 1 mil in 10 inches for every 10 degrees F change).

A sheet can also be distorted several thousandths (inch) by the holding method. Some (not properly stabilized) sheets can change size differently in different directions.
GR
 
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