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Thread: linear actuator projects?

  1. linear actuator projects?

    I havent posted in a while because my last project got lost in my curiosity for bipeds. Anyways, I am looking into building a biped that uses linear actuators instead of servos. After searching I keep coming back to either SPAL linear actuators or the servo city ones due to cost, speed and force.

    Spal:

    SPECIFICATIONS
    Stroke 300 mm (11.81")
    Voltage 12 DC
    Push/Pull Ratings
    Dynamic 107 lbs. max
    Static 500 lbs. max
    Extension Speed
    No Load 0.59 in/sec
    Max Load 0.39 in/sec
    Amps
    No Load 0.6
    Full Load 3.4
    Duty 20%
    Enclosure IP54
    Pin Holes 5/16"
    Retracted Length 450 mm (17.72")
    Shaft Dia. 20 mm (0.787")
    Size 18-1/4" x 1-1/2" x 3"
    Shpg. 5 lbs.

    Servo city:

    Operating Voltage: 6.0-12 Volts DC
    Operating Temperature Range: -20 to +60 Degree C
    Operating Speed (12V): 2.00 second at max load
    Dynamic Thrust (12V): 25 lbs. Thrust
    Static Load: 500 lbs.
    Current Drain (12V): 500mah no load operating
    Motor Type: 3 Pole Ferrite
    Potentiometer: I0K
    Gear Type: 4 Metal Gears
    Connector Wire Length: 24"
    Recommended Fuse: 10amp inline
    IP Grade: 2IP 63-total dust protection, water resistant


    I cant seem to find any projects at all utilizing either of these and I was wondering why? Is there something im missing? The spal ones seem to be a little slow and the SC seem on the weak side but does anyone know if these can be theoretically accurate enough to be used in a larger biped? ( I think SC has better speed/force options in the making)

    I think maybe a large arm project using either would be a safe/easier project to learn from to get the electronics etc figured out? Would really like to hear your opinions on these!

  2. #2

    Re: linear actuator projects?

    I know why. The price tag.

  3. Re: linear actuator projects?

    haha The spal ones arent so bad. They can be had for about the cost of higher end servos. ($80 bucks)

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