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Seeking mechanical design help for an outdoor mech 'robot' build! Answered

Hi all,

I am currently collecting car parts and I'm itching to make a mech robot (like these: https://www.pinterest.com/finechen39/painted-robot/)

What I really want to do is have it close to my garage door, inert and crouching, until a motion sensor picks up movement. Ideally three actions would follow: I'd like it to stand up, ideally with lights turning on, and shortly afterward crouch back down.

I have a shop and can weld, woodwork and have a very basic electronics understanding. I think I'd like to learn about hydraulics (I was looking into a used motorcycle lift as an internal mechanism to get this thing to rise). I'm not sure yet how to set a delay before it crouches back down.

I'm looking for any recommendations - this is the first phase of my research into this project!!!

OK, thanks in advance!




Best Answer 3 years ago

A lot depends on how fast you want to the mech to rise, I assume you want a threatening rise so an electric motor driving a hydraulic pump one way valve to rise, hold and a release valve to lower.

The motion sensor closes a relay that stays on ( pump and lights) until a micro-switch on top stops the pump and starts the $6 timer


which after a time activates the release valve relay that gets reset on by the bottom micro-switch and ready to start the whole action again. You might add a time-out to prevent action for some time.


3 years ago

hey iceg, thanks! That is amazingly helpful! Right now I'm trying to sort out what the skeleton of the Mech should look like. I picture the hydraulic embedded in the leg, lifting the hip. I also like the idea of running internal aircraft cables that pull tight as it stands, making other parts move (tilting the head up, etc). Like a really heavy complicated pop up book. Do you know if the equipment you recommended can be used outdoors? I could try to weather proof all the electronic components.


Answer 3 years ago

Just be very, very careful. Hydraulics are exceptionally high force actuators, and can very easily cause a scissor action to cut your head off.


Answer 3 years ago

You can put most all the electrics in a "Nema" metal box or outdoor fuse box easy access and rain proof easy to weld to keeps relays dry run wires out bottom and can accept solid or flexible wire channeling (thinwall) can look very robotic.


3 years ago

Wow, grand plans!

First thing to do is to have a browse through the site (use the "let's make" box at the very top of the page).

Start with things like animatronics to get the control systems (especially things created to lurk in the garden at Hallowe'en), and hydraulics for your actuators:



And don't forget the close cousin to hydraulics - pneumatics:


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