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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.

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?

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

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.

8mm

>1/2 second

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

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

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.