2015-09-07 (M) Wrist Mounted Chording Keyboard

Numerous nuts were necessary to test the wrist mount hardware which was cumbersome to assemble. In order to eliminate the necessity for these nuts spacers were designed to go between the existing parts. If the spacers are the correct size the parts can be redesigned to have the spacers included so they be printed and assembled easily in the future.

Mostly the lower part of the wrist mount was measured for spacers but a spacer was measured for a joint where a lever arm connects to the keypad. On the pinkie finger side of the keypad a spindle identical to the ones used by all the other fingers was used instead of a custom spacer on top of the unique pinkie finger spindle. This eliminates the need for a separate pinkie spindle in the future.

Keypad at top and mount at bottom

Only a sketch was made of the mounting pieces and measurements were drawn on the sketch. Existing pieces were drawn in black, bolts were drawn in red and dimensions were written in green. A spindle was imported and spacers were sized according to the measurements taken. Models will not be provided for the spacers since they will be integrated with the other parts.

Sketch of mount with dimensions

Model of spacers

Downloadable Files:
To do:
  • Wrist mount
    • Revise offset levers 
      • Make holes in thumb board cylindrical instead of countersunk 
      • Add 3D printed spacers to avoid using extra nuts and washers
      • Add spacers to modeled parts
      • Add limit switch mounts
      • Connect servo arms
      • Lengthen servo arms
    • Integrate:
      • Controller
      • High precision potentiometers for tuning servos
      • Servos
      • Enclosure for each controller
      • Limit switches
      • Activation switch
    • Debug 
    • Test
    • Refine
    • Repeat
    • Activation switch
    • Route wires 
  • Write instructions
    • Compress and link to all files
      • OpenSCAD files
      • STL models
      • Arduino code 
    • Make diagram with everything labeled 
    • Schematic

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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2015-09-06 (Su)