Seeking a type of linear actuator, which may or may not exist

  • Thread starter some bloke
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  • #1
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Summary:

I'm looking to find a linear actuator which moves quickly and can move a moderately low load (say, 10kg) but which also features an adjusting hard-stop which can withstand significantly heavier.
As the brief summary explains, I'm looking for a linear actuator which moves quickly and can move a moderately low load (say, 10kg) but which also features an adjusting hard-stop which can withstand significantly heavier. So effectively, the actuator can move in and out, preferably quickly, but has a hard stop which can take a high load but not move it - effectively converting the linear actuator into a solid strut of fixed length. However, the length it is fixed at needs to be able to change between loads, by way of a second actuation. effectively, the second actuation needs to adjust in length until it takes a load, at which point it has to lock in place until the load is taken off.

Does such a thing exist? The application is for a walking robot I am designing (purely for the exercise of it) where I want the legs to be able to carry the robot, and adjust to terrain underneath pre-emptively, but not have to have every actuator be a large, heavy and expensive one which can lift the robot with its actuation - I only want the actuators to be able to lift the feet, then allow them to compress to a varying fixed stop as the weight of the robot goes onto them.

If it doesn't exist, I'm thinking I will have to design them myself. I'm thinking I will need a floating carrier which will be moved by two independent pieces - one will be a fast moving light actuator, and the other a slower moving hard stop which will prevent the carrier from continuing its path even if the light actuator has moved beyond it.

Thanks for any direction you can give! I've tried and failed to find such an actuator!
 

Answers and Replies

  • #2
Baluncore
Science Advisor
2019 Award
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I believe you need two components, one is the linear actuator, the other is a brake that locks the actuator when the actuator is not powered. They are available combined.
Google 'linear actuator with brake'
 

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