This study determines the
flatness and replication properties of a light guide plate with different microinjection molding parameters.
The deviation (dist) has to be smaller than the tolerance specification for the
flatness.
Comparison of measurements of
flatness has been made with different device and methods, measured with CMM, marble table and comparator.
Also
flatness does not imply U - (P), otherwise by Theorem 2.2, for cyclic right S-acts
flatness and Condition (P) coincide which is not true in general.
If you engage in research about any geometric dimensioning and tolerancing (GD&T) standard, you'll learn very quickly that
flatness is not a characteristic referenced to a datum.
This interface between aesthetic and psychological
flatness is addressed in a 1998 work (shot on both video and film) tellingly titled Flat Is Beautiful, in which Benning follows Taylor, a preadolescent tomboy, as she drifts through life.
His design engineer colleague, Walter Wrona, explains, "
Flatness of the components is an important criterion in the manufacture of sealing surfaces, but we also need a complete understanding of how the mating surfaces operate together in order to do meaningful reliability analysis." To this end, the company has integrated FlatMaster, a non-contact optical-based measurement tool, into their process.
Unfortunately, the powder also can add as much as 100 microns to the surface of the part, which affects the
flatness measurement.
The PSA-80BW provides up to 20 GHz frequency coverage, 0.1 dB amplitude
flatness, 0.7 degree phase
flatness and offers optional 1.2 Gbyte deep capture memory to provide eight seconds of full band-width capture at the maximum sample rate.
At the Army and Air Force's primary metrology laboratories, two other units are being used to measure the ac gain
flatness of state-of-the-art commercial ac voltmeters and calibrators at frequencies up to 30 MHz.
They deal mostly with sky with a flattish landscape at the bottom, so they could be the park's
flatness or that
flatness we know from The Wizard of Oz.
Spergel of Princeton University calls the finding "only incremental progress," because other studies had already indicated that the universe contains only one-third as much matter as needed for
flatness and supported the case for dark energy.--R.C.
Suitable for mounting, plating, polishing, etching and final dicing of GaN, GaAs, Si and other materials, these plates feature a
flatness to 0.5 fringes of HeNe and parallelism from 20 arc-secs to 1 arc-sec.
