Linear actuators are machines that convert rotation or any motion into a push or a pull motion.
Here I am going to teach you how to make an electric linear actuator using household and hobby objects.
It is very very cheap
Step 1: Go Get the Stuff
All you need is a glue stick
A servo modified for continuous rotation or a geared motor with high torque (i used servos as i could control theiir motion)
Step 2: The Attachment.
Strongly attach the Servo horn and the bottom of the glue stick(the end we rotate to get the glue out).
Attach it strongly enough (STRONGLY STRONGLY).
Step 3: Finished
Now enjoy the cheapest linear actuator.
The principle is that when the servo rotates, it rotates the bottom of the glue stick. Now we all know what happens when we rotate the glue sticks end, it comes up or down depending upon angle of rotation. Easy isnt it , you could make hundreds of these.