Reverse double four bar lift

VEX V5 Technical Support UNOFFICIAL Tech Support
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Hi all,

Can anyone done a reverse double four bar lift using 2 linear electric actuator ?

If so can I have a photo of location to read up some more…

Cheers

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Why is this “VEXCode V5 Tech Support?”
@DRow

Anyways though I do not believe linear electric actuators exist in VEX. There’s linear air powered pneumatics or electric motors that provide rotational motion.

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if you’re looking to build a dr4b from vex components, this is an excellent guide:

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Why would you use linear actuators to make a DR4B? the whole point of it (in the context of vex) is to lift upwards. you don’t need a DR4B for this if you are using something that already allows for linear translation lol

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Maybe it is not in the context of VRC?
But maybe he is just trying to use vex parts to do a dr4b ?

Anyway @Gerard - you might want to consider using lots of pneumatic actuators for it.

Long time ago, 599D did it… using pneumatic actuation instead of the usual motors.

Edit: 599D did it for a 6-bar lift. But i would imagine you can do the same approach for dr4b as well

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This video shows a DR4B (at about 0:25) that’s actuated by both motors and pneumatics, kind of an interesting idea:

Probably doesn’t make sense in VRC nowadays though, since using pneumatics reduces the number of motors you can use – that wasn’t the case back in Skyrise.

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Hi All, thanks for the help and the pneumatic actuators are cool…

Im currently making an 8 meter DR4B communication mast arrangement. and need it to be electric actuated with a minimum of two actuators at the joints., any help is greatly appreciated…

Thanks heaps. Gerard

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What sort of motion profile are you looking for? is it meant to go straight up? what other design constraints (budget, tools available, etc) do you have

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Hi Ethan straight up.

This is the motion, is you can help that would be awesome.

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what is the weight of the object you are lifting and how accurate does it need to be?

If you need high precision I would consider using electric servos for this project. you can buy some from mcmaster-carr (McMaster-Carr ) or hobby king (i still have no idea what the budget or loading conditions are for this) and make a simple parallel 4 bar with a short gear train to get the torque you need

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