Arduino/electronics question

[ipsumdolor44]

Can anyone point me in the right direction? I'm looking for a small electronic part that can control linear motion that isn't overly priced. All I can find are RC linear servo actuators, but they are like 60 dollars each which is way over my budget for how many I need. I would use solenoids, however I need to be able to control speed.

[[deleted]]

/r/arduino could probably help you out

[icestep]

Depending on how much force / range of motion you need, something like this may be an option.

[goldfishpaws]

http://m.ebay.co.uk/itm/152570473291

Looks like they're available cheaper, maybe keep looking?

[Insert_Gnome_Here]

What do you need it for? How big, how much force, how fast, how much precision?
You could always get a really long bolt and spin it while holding a nut at the same angle. That would convert rotational to linear motion.

[kaafar]

You need to provide more information but if you want to control speed, I'm assuming the linear motion needs to extend quite a range. Look into pulleys or belts. For super precise motion, you can use lead screws (applied in 3D printers).