I have a tiny tube that sprays lubricant but I need it to move between some holes in a line. The total distance is only 10 inches.
So imagine the holes like this:
[ o o o o o o o o o o ]
And I need to move the lubricant tube between them.
I think I need a linear actuator to move the tube, but it doesn't need to be strong at all (less than 1 lb of force) or very accurate. If it lubricates a little bit off center it doesn't matter.
My issue is that linear actuators are so expensive! I'm currently leaning towards building one with Knex or Lego Technic and a servo. But does anyone know of a cheap/weak/inaccurate hobby option for less than $30?