I have some results from my Angle Cube conformance test this week. These results apply only to the test article (my personal Cube), and while inferences can be made for other Cubes, there is certainly no guarantee. On the other hand, it is not unreasonable to expect similar results.
If and when I remember my ftp login I’ll post the deviation plot. :unsure:
A precision angle block set, master level, granite surface plate, and precision 360° tilt table were used. The Cube was tested for deviation from (0 to 45)° in 5° intervals, in CW/CCW directions, with angle blocks and surface plate, and from (10 to 20)° in 1° intervals, in CW/CCW directions, using the tilt table.
The surface plate test area and tilt table platen were level/perpendicular to 10 arc seconds. Ten arc seconds is approx. 0.17 arc minutes and approx. 0.003°. The errors contributed by the angle blocks and tilt table were negligible. The ratio of measuring equipment accuracy to the Angle Cube accuracy specification, ±0.2°, was >10 to 1 (much greater…).
My Angle Cube measurement results:
LEVEL Mode
No measurement exceeded 0.1° deviation from the reference angle.
No repeat measurement exceeded a 0.10° delta.
The Cube frame was square. The sensor was square to the frame. On the surface plate, with each side resting on the plate in-turn, each 90° rotation resulted in a display change of 90° through a 360° rotation. The Cube read 0.00° when inverted.
On the tilt table, each 90° rotation resulted in a display change of 90° through 360° of rotation. The Cube read 0.00° when inverted.
The display flipped when the angle exceeded ±90° from 0 or 180 to give a right-side-up view, as advertised.
ZERO (BEVEL) Mode
The Zero mode worked well. No bevel exceeded 0.1° from the true delta. One example: Starting from 0°, Cube rotated 20° CW. Display reads 20.00°. Tilt table at 340°. Press Zero. Display reads 0.00. Rotate tilt table CCW through 0° to 20°. True bevel (delta) is 40°. Cube reads 40.05°.
Conclusion: My test article meets the manufacturer’s specification.
Additional notes: LEVEL Mode. The Cube was turned off and then back on at a new angle. The Cube “knew†where it was and indicated the new angle correctly.
Any mode: The display did not always reach stability right away. Sometimes as much as 15 seconds were needed, but generally 5 or so seconds was enough.
The magnets all held very well, but on a very smooth surface, one of my sides slid down the metal wall.
If anyone has questions, I’ll be happy to explain where I went wrong…..
