This is a linear actuator for a 9g servo. It is designed to be laser cut from 3mm material (I use MDF) and generally snaps together although some glue may be required.
It works pretty well, although at the extremes of the driver rod there is a little bit of vertical wobble.
The gear slides snugly onto the end of the servo, so no glue or screws should be required for good motion.
Overview and Background
This linear actuator was designed because 3D printing them out was quite tedious and error prone due to warping of the plastic. I figured that a laser cut design would work just as well and be much faster.
It is much faster (a minute or two to cut and another one or two to assemble), and although there isn't quite as much stability due to no dove tail on the driver rod, it's enough for my use, with the only noticeable issues being at the extreme ends.
Lesson Plan and Activity
I use these in Robotics for a range of purposes.
Some potential uses are:
- Levelling and tilting beds
Gives students an understanding of translating rotational distances into linear ones as well (circumference of X rotated through angle Y gives movement of Z).
I use 3mm MDF for construction, but another material that doesn't splinter and catch on the edges would be suitable, such as 3mm acrylic.