2015-11-24 (Tu) Desktop Chording Keyboard

First printing for the keyboard was made. While measurements for the switch holes were copied exactly from an online source haste in programming put the holes in the wrong position. As seen in the picture blow the printed piece's holes do not line up with the switch's holes. Only a single side was printed which was done to find problems like this. The height of the switch was also questionable so changes to the program were made quickly and a second print was started.

Misaligned holes

Changes to the model took only a few minutes. Footprint for the switch was correct so those measurements were not changed but the distance between the switch and the key lever was not optimal. When the switch was raised up the plastic below it was also raised which saved on the amount of plastic needed to print. No changes were made to the key levers.

OpenSCAD view of the model with three key levers

Printer view of the pieces

A full print was made with three key levers in approximately two hours. Three key levers was enough for the thumb switches but the key lever from the test run was usable. Three #6 bolts, four inches long, and nuts were used to assemble the printed pieces. A 1/8" brass rod was used through the upper hole to hold the switches by tension. Inserting a bolt through the bottom switch hole was tedious but only had to be done once. Switch alignment was not finicky due to the wide key levers. Key alignment was a slight issue which should be corrected by increasing the diameter of the key lever hub.

 Assembled keyboard

Keyboard in line with the keys
Flipped switches looking inside the keyboard

To do:
  • Make a 3D printed version
    • Print
    • Assemble
    • Test
  • Increase hub size
  • Print thumb switches
  • Assemble
  • Publish models
    • Finished stl model with 0º base
    • Finished stl model with 15º base
    • OpenSCAD code
  • Build base
    • Construct or shape
    • Drill wiring holes
    • Stain
    • Finish
    • Attach keypads
  • Write instructions

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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2015-08-17 02 (M)