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12V Push Mechanism

12V Push Mechanism

12V Push Mechanism

(OP)
I am in need of a 12V DC device that can push with at least 6 pounds of force.

Does anyone have ideas on the cheapest way to accomplish this?

Greatly appreciate any input.

RE: 12V Push Mechanism

It's called a "linear actuator".

RE: 12V Push Mechanism

(OP)
Thank you.

Do you know of any push type solenoids that would provide this type of force?

RE: 12V Push Mechanism

McMaster.com

RE: 12V Push Mechanism

Over what stroke/speed do you require that force? What current at 12V is available?

Solenoids have narrow strokes of peak force. http://www.farnell.com/datasheets/1701736.pdf

Voice coil actuators will have more liner force profile but are expensive. http://www.moticont.com/voice-coil-motor.htm

Linear actuators usually compise motor with lead screw or rack and pinion are slower and longer but can give even push force over long range. Probably too big.

RE: 12V Push Mechanism

(OP)
The speed is not a concern; the current that is available is from 8 AA batteries.

RE: 12V Push Mechanism

(OP)
>1/2 second

RE: 12V Push Mechanism

How far?

RE: 12V Push Mechanism

(OP)
8mm

RE: 12V Push Mechanism

Hi Tony

Can you tell us anymore about the application in one post?

“Do not worry about your problems with mathematics, I assure you mine are far greater.” Albert Einstein

RE: 12V Push Mechanism

I would go with a lead screw approach, since the force can be defined by the lead pitch and motor speed

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RE: 12V Push Mechanism

(OP)
The application is to remotely activate a pressurized can of paint. The push force must be 6 pounds, the mechanism must travel 8mm and hold for only .5 second.

RE: 12V Push Mechanism

I think your AA batteries will be too small (at least for 12 volt solenoids). Make sure to check that with whatever device you end up with.

RE: 12V Push Mechanism

(OP)
I am considering AA batteries because they are cheap; do you have a better idea on a different type of DC supply?

RE: 12V Push Mechanism

The amount of work done and mechanical power required is relatively trivial, 0.2J and 0.4W.

8 cheap NiMH batteries contain 43200J, so it's just a question of making the energy do the useful work.


Something like this would work for the actuator:
http://www.mcmaster.com/#6509k81/=xnimd2

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RE: 12V Push Mechanism

How is it physically actuated? Could you use a spring in between the (valve?) and actuator that is preloaded with 5 lbs of force, so the actuator only needs to supply 1 lb? Only mentioning this because you asked for the cheapest way.

RE: 12V Push Mechanism

Gear motor and over-center linkage. It gives the maximum push at the maximum displacement without over-doing it and requires little power to hold open. Because it can have the greatest amplification (less leverage) at the start it can move rather quickly.

6 pounds seems high, but that's based on all the pressurized cans of paint I've come into contact with.

RE: 12V Push Mechanism

(OP)
IRstuff (Aerospace)16 Jun 15 06:27
I would go with a lead screw approach, since the force can be defined by the lead pitch and motor speed


IRstuff: Do you mean a stepper motor linear actuator?

RE: 12V Push Mechanism

Solenoid has the advantage of on-off electrical operation. Motor solutions need to be driven "ON" and driven "OFF".

je suis charlie

RE: 12V Push Mechanism

It might be worth looking at central locking door actuators. High force, high speed, 12v and cheap at your local wrecking yard or on E-Bay. Probably need to drive it in both directions though. Link

je suis charlie

RE: 12V Push Mechanism

The converse of the advantage of solenoids is that a lead screw approach does not require power to keep it in place, i.e., if you want the pusher to maintain a physical position. Lead screw systems can be driven by steppers or servos. Unless you have some specific need for the stepper motor, a servo motor would more straightforward.

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RE: 12V Push Mechanism

Tonymat, If I understand your application correctly it seems to be an ideal application for pneumatic actuators. You could use your 12v to drive a compressor long enough to pressurize a small tank. You place one valve (manual or solenoid) for each application point there at the tank. If you can run wires to the various application points you could just as easily run small air lines to those points. Then at each application point you place a small single-acting spring-return air cylinder. They would need only one air line for each. If your tank is at, say, 30-40 psi then cylinders as small as 1/2 inch bore could produce the force you need.
Several companies make miniature air cylinders and valves. The best known is probably Clippard (www.clippard.com). Call a customer service rep there. They'll help you figure it all out. And you can get 12V air compressors several places. The most common use is as backups for auto tire inflation.

RE: 12V Push Mechanism

Motor, reduction gearbox, cam on the output shaft. If you're fussy, fit a cam follower to the spray can.

RE: 12V Push Mechanism

(OP)
All you experts have been very, very helpful.

I have a lot of research to do from your suggestions.

I appreciate all your kind and thoughtful help.

RE: 12V Push Mechanism

You may be able to use solenoid solenoid valve in place of existing plunger valve. Mechanically fix plunger in perminantly on state and plumb paint out through solenoid valve which will now control flow of paint.

Advantage would be to avoid mechanical issues of matching actuation to plunger valve movement. Solenoid valve can use power of pressurised paint to seal valve and low power coil can be used.

Ploblems would be getting valve suitable paint medium. Needs a bit of research

http://www.alibaba.com/product-detail/Brass-materi...

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