2015-08-27 (Th) Wrist Mounted Chording Keyboard

Modeling was done for a servo and hinge holder. Pieces focused on the idea of using #6 (3.5mm) bolts as cross-members. For this design consideration bolt holes had to be placed identically to ensure a bolt could pass through all the pieces. Two pieces were modeled, one which would hold the servo and act as the body and the smaller second which was meant to act as a hinge base while mounted parallel to the body. A quick model was drafted and printed but the distance between the hing and servo was approximately 9mm too long so a second model was made to correct this.

First print and shorter corrected print below

Rotating view of short model

Printed pieces were attached with 3" (75mm) bolts which were almost certainly too short. Numerous nuts were used which was time consuming and finicky but acceptable for an early prototype. Servos were laid in place but not screwed in place.

Assembly with printed parts

Focus on servo and expected clearances

Servo lever arms which attached to the underside of the servo horns should be modeled to conserve space. These levers would have a large (7mm) hole at the servo end which the servo horn would pass through while giving it a good leverage point. Designing a lever arm like this would only require one screw to hold it in place.

Downloadable Files:
To do:
  • Modify two servos for continuous rotation.
  • Wrist mount
    • Model lever arms
    • Build
    • Test
    • Refine
    • Repeat
    • Activation switch
    • Route wires
  • Write instructions
    • 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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2015-08-25 03 (Tu)