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Piezos won't work because they don't release upon power loss.

Thanks for the suggestions.

Thanks for all the suggestions and good ideas! The voice coil is one of the leaders. I have a valve company quoting on a custom product. I don't know if I mentioned it but it has to control air and oxygen up to 100% oxygen at room temp. I experimented with a linear motor today and got some...

Overall control needs to be to position to .001" and hold against varying pressures.

No, this is most certainly not a school project--it is an actual life support device controlling low pressure flow of gas. I am experimenting with a linear motor currently, and a voice coil is also a possible choice.

The rack and pinion is probably the best, however, our challenge is to not use this design if possible.

75% duty cycle is 20msec to position and immediately 20 msec to return then pause 12msec. The chain idea is good, but way too big, this package must be in a profile of < 2"x2" x 5". It also can't be just a solenoid since it needs to be proportional.

A few more details seem in order. The need is based upon a valve actuator which has an approximate mass of 4 grams, needs to move .400 inch in approximately 20 msec. Positioning accuracy should be to .001". The killer requirement is that it must be able to return to a default position in the...

I need a way to convert rotary motion to linear motion just like a rack and pinion, but it can't be a rack and pinion or a ballscrew. Anybody have any ideas.

Need a way to control a large orifice proportional poppet with a microprocessor. Must have linear actuation of approx .400" and develop 6N. Anyh ideas? Thanks