150 LB linear actuator

Hello all!

My name is Steve and I’m new to this site.

Have a pretty simple project I am working on but need some advice. I plan on making a small gas powered go-kart into R/C. The problem stands with the steering control. I will need at least 150 lbs of force (under extreme loads) and 3 inches of travel in order to steer. I’m planning on using a standard 2.4 R/C two or three channel radio with 1/4 scale servos for the throttle and brakes. I can also use an arduino setup with Xbee if that helps. Here’s my question, how do I control the linear actuator? I want it to act like a servo. All of the actuators I see use a simple motor with limit switches w/no feedback capabilities. If this is the case, can I add a position sensor so it sends the position back to the controller thus allowing it to think it’s a servo? A bunch of other methods come to mind like stepper motor with gear box or other none off the shelf configurations. I’m looking for something like a plug and play servo but in the form of a linear actuator that can handle the load. Any suggestions?

They exist! There are two main options:

  1. Some DC linear actuators actually accept direct RC input:
    Ex: robotshop.com/eu/en/servocit … RB-Sct-102
    Ex: robotshop.com/eu/en/servocit … =RB-Sct-97

  2. Choose a linear actuator which has a potentiometer (and <4A max current under load) and use it with the LAC:
    robotshop.com/eu/en/firgelli … board.html
    Ex: robotshop.com/eu/en/4-stroke … RB-Fra-111

Very cool…Thanks! I will be sure to post pics and details as I go.

It’s to bad they don’t make big heavy duty servos. I would love to see something two or three times bigger than a 1/4 scale

You mean something like these:
robotshop.com/en/catalogsear … t&dir=desc

To get a sense of their size:
robotshop.com/blog/en/files/ … 00x364.jpg
The one fourth from the left is the 805BB (quarter scale).