TODO: Run these tests to check how accurate and repeatable my printer and laser cutter are:
- inter-page repeatability
Print (or cut) multiple copies of the same page. Measure the differences between each copy. (translation, scaling, and any non-linear distortion)
- straightness and trueness
Print (or cut) large rectangles that cover various parts of the page (including covering the entire width). Measure and confirm that 1) the lines are actually straight, and 2) each corner is 90°.
(a 6x6 grid makes a good general pattern)
What can be used to precisely measure these?
- flatbed scanner
- digital camera CMOS / CCD
How can we confirm the accuracy of my measuring equipment?
- NIST ruler
(or some other reference object)
- measure the same object at different angles and positions
If the object changes size or becomes oblong in some positions, then the measurement device doesn't provide uniform measurements.
This provides information about the relative variation across the measurement field, but doesn't provide information about the absolute distance error.