2016-01-01 (F) Weekly Summary

Another week was spent focused on the compass. Most of the revisions have been focused on the spinner. The rest of the parts have seen some work but they have just been to support spinner changes. The week started by printing a full set from new code.

All new models

The models fit together well and changes were easier than working on the old code. Balance was good and the spinner could easily spin on the post.

Assembled and spinning

Printing a groove in the top of the spinner had been tried before it always ended poorly. I tried again and it ended poorly. Making a flat surface that doesn’t touch the print bed or end up as the topmost layer is a recipe for disaster on this 3D printer, and many other filament printers.

Printing problems

Instead of trying to print flat surfaces upside-down the spinner was split into two parts. The bottom part held the magnets and had the keyed hole while the top was simply a cap with the pivot point. By printing them separately and gluing them together it was possible to print at a comfortable angle.

Printing spinner in two parts

The two-part spinner was put into the enclosure and a brass screw was put in from the top. The screw was adjusted so it would tap on the metal magnets when the spinner pointed the same direction. This would provide the metal-on-metal collision necessary for feeling the direction.

Assembled 2-part spinner and feedback screw

Unnecessary bulk was taken off the spinner model. Rather than a printed cap and printed post the cap was replaced with a piece of brass formed into a cup and the post was replaced with a brass nail. This made for a pivot point with a lot less friction.

Slim spinner with brass strip for cap

Escutcheon pins used for a pivot

The model with brass parts spun very well but the alignment wasn’t as easy so the spinner hung crookedly. Another issue seemed to be that the pivot point had been lowered.

Brass strip top which hangs crookedly

The rest of the weekly summaries have been arranged by date.

First time here?

Completed projects from year 1
Completed projects from year 2


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