Simple drawing arm

Let's Make Robots Robots
1

this is my first try to build a drawing machine.it is a very simple 3dof arm,including 3 standard servos(one for pen up/down) and a arduino uno.software is arduino&processing.

i try to use it decode some mathematical curve,so much fun.the primary image is archimedes spiral.the below is descartes to princess's letter: r=a(1-sinθ).the machine drawing three times,you can see some offset at the same point because the servo issues.

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hobby

This is a companion discussion topic for the original entry at https://community.robotshop.com/robots/show/simple-drawing-arm
2

Cool!

Instead of servos, i’d use small 5v steppers motors like the 28BYJ-48.
Then use a 3d pen instead as a normal pen:)
Or a multicolor pen!

Servo jittery can be eased by adding a counterweight, drawing near the base and reducing weight of the arm.

3

really nice. I’m waiting for

really nice. I’m waiting for more

4

Why stepper motors instead of servos?

hi,

could you also add what advantage stepper motors would have compared to servos in this project?