2016-01-17 (Su) ESPeri.Impass

Three new spinners were printed. Slots around the central pivot point were significantly narrower to reduce the angle where the magnets can strike the post. This was a problem since the spinner could strike the post, which is supposed to mean the user is pointed north or south, in a wide degree of motion. In other words there was not enough precision in the old model. A comparison picture was taken to illustrate the differences between the old model, left, and the three new prints.

Old model, far left, next to three new models

A new base was printed. The shortened nails to the sides of the central post were modeled closer to the center and the middle post was sleeved with metal tubes to make it wider in the middle. This shape was meant to be closer to the old model which was more precise.

Base constructed with sleeves over central pin

Size of the compasses have been decreasing, which is good for the development of the compass. The last three working models were arranged on a desktop in order to take a picture comparing their sizes and differences. The largest one, on the left, used a bulky sphere with large magnets close to the center and wasted space at the perimeter. The middle print could tap on the prominent brass screw poking out the top but the magnets were positioned very high which lead to wasted space below the magnets and a top-heavy spinner which was unstable. Finally, the current model, on the right, uses a cylindrical spinner meant to tap on the internal metal post and had much less wasted space. All spinners were mounted between two printed layers for the base and lid and spaced with brass bolts.

Size comparison of last three revisions

To do:
  • Make handheld haptic compass
  • Make compass work from pocket or necklace
  • Miniaturize
The rest of the posts for this project have been arranged by date.

First time here?

Completed projects from year 1.
Completed projects from year 2

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2016-01-15 (F)