Motorized Actuator Good

Short travel, 50 lbs, slow, electric linear actuator?

I need an electric linear actuator with only about 1/4 inch travel, but it must supply at least 50 lbs force. It can be real slow, and the operation is intermittant with low duty cycle. Ideally, something like a heavy-duty micrometer motorized by a stepper motor. Accuracy requirement on the linear motion is not high: about 0.003 inch. I've looked extensively on the web, and have not found a really good solution. I'd prefer to buy a complete solution with controller.

Try this site

http://ultramotion.com/products/

the actuators here are better than your spec.

Pneumatic Actuator $68.51 High Quality Content by WIKIPEDIA articles A pneumatic actuator converts energy (in the form of compressed air, typically) into motion. The motion can be rotary or linear, depending on the type of actuator. A Pneumatic actuator mainly consists of a piston, a cylinder, and valves or ports. The piston is covered by a diaphragm, or seal, which keeps the air in the upper portion of the cylinder, allowing air pressure to force the diaphragm downward, moving the piston underneath, which in turn moves the valve stem, which is linked to the internal parts of the actuator. Pneumatic actuators may only have one spot for a signal input, top or bottom, depending on action required. Valves require little pressure to operate and usually double or triple the input force. The larger the size of the piston, the larger the output pressure can be. Having a larger piston can also be good if air supply is low, allowing the same forces with less input. These pressures are large enough to crush object in the pipe. On 100 kPa input, you could lift a small car (upwards 1,000 lbs) easily, and this is only a basic, small pneumatic valve. Author: Surhone, Lambert M./ Tennoe, Mariam T./ Henssonow, Susan F. Binding Type: Paperback Number of Pages: 76 Publication Date: 2010/08/31 Language: English Dimensions: 6.00 x 9.02 x 0.18 inches

A Combined Piezoelectric and Composite Actuator $132.24 A novel compositepiezoelectric actuator configuration is proposed and analytically modeled in this book. The actuator is a low complexity, active compliant mechanism obtained by coupling a modified star cross sectional configuration composite beam with a helicoidal bimorph piezoelectric actuator coiled around it. The modified star beam is tailored and optimized to achieve increased torsional compliance and bending stiffness at constant axial stiffness. The coiled piezoelectric actuator is designed to directly generate finite rotation output without need for mechanisms to amplify the piezoelectric displacement output and/or to convert linear output to rotational output. The proposed cylindrical actuator configuration is compact and is a good candidate for use as a hinge tensiontorsion bar actuator for a helicopter rotor blade flap or blade tip. For such cases the modified star composite beam also carries the centrifugal loads of the flap or blade tip, and those of the coiled actuator, thereby eliminating the need for a thrust bearing. Author: Ha, Kwangtae Binding Type: Paperback Number of Pages: 124 Publication Date: 2009/05/01 Language: English Dimensions: 9.00 x 6.00 x 0.29 inches

Actuator $70.1 High Quality Content by WIKIPEDIA articles An actuator is a mechanical device for moving or controlling a mechanism or system. It takes energy, usually transported by air, electric current, or liquid, and converts that into some kind of motion.The efficiency of an actuator is a standard tool used to calculate or estimate the usefulness of any actuating mechanism. It is a dimensionless quantity which is generally lower than 1 expressing the energy conversion factor. For better explanation see Thermodynamic efficiency. Most of the wasted energy (due to friction, magnetic losses, eddy currents, whatever) is thermally dissipated. Author: Miller, Frederic P./ Vandome, Agnes F./ McBrewster, John Binding Type: Paperback Number of Pages: 86 Publication Date: 2010/08/20 Language: English Dimensions: 6.00 x 9.02 x 0.21 inches

Actuator Assembly A1200S $89.94 Actuator Assembly A1200S BENNETT ACTUATOR ASSEMBLY A1200S

Actuator Assembly A1101 $89.94 Actuator Assembly A1101 BENNETT ACTUATOR ASSEMBLY A1101

Banks BigHead Wastegate Actuator $193.99 BigHead Wastegate Actuator;

Short Actuator Assembly $105.94 Short Actuator Assembly Bennett Actuators - SHORT ACTUATOR ASSEMBLY

Hinges Upper Hinge For Actuator $21.94 Hinges Upper Hinge For Actuator Bennett Hinges - UPPER HINGE FOR ACTUATOR

Standard Actuator Assembly $81.94 Standard Actuator Assembly Bennett Actuators - STANDARD ACTUATOR ASSEMBLY

9000 Series Microcommander Actuator $2665.94 9000 Series Microcommander Actuator ZF Mathers 9000 Series MicroCommander Actuator - 9000 SER MICRO COMMANDER ACTUATOR

Warn Replacement Actuator Relay M9180094 $10.95 Replacement Actuator Relay for Warn

Linear Actuator using Stepper Motors

Pneumatic Valve, Solenoid Valve And Intelligent Transduction

If you're looking for good solenoid valve, you'd be pressed to find a better brand than Parker valves or its subsidiaries, most of whom sell Parker's products, identical but for repackaging.

Parker valves are used for motion control in a vast number of industries - so vast a number, actually, that entering any large scale factory or production facility is bound to bring you into contact with machines that contain at least a few of the company's products.

solenoid valve and servo motors are, to mince no words, absolutely crucial to the process of intelligent automation. We say 'intelligent' because solenoid valve are designed in such a way that they can respond to stimuli - so that, in some way, the condition of the whole machine is sensed by the servo, a sense to which the device then adjusts its operation accordingly.

An example of this technology of transduction, as it's called, can be found in cars that utilize cruise control. Cruise control systems usually estimate the ground speed of a car by the speed of the rotation of the car's driveshafts. On the basis of that information, cruise control systems change or maintain the position of the throttle by means of a solenoid (the same kind used in solenoid valves). Thus for a device to be a servo, be it a valve or a motor, it needs to perform some kind of error correction in response to outside conditions.

Another example was the earliest incarnation of the world famous thermostat, which was designed and patented by one Albert Butz in 1886. This device was designed in such a way that when a room's temperature fell below a certain level, the device would close a circuit and in so doing energize a solenoid which would suck in its armature, allowing the main motor shaft to turn one half revolution, pulling a chain connected to its crankshaft which in turn would open the furnace grate wider, allowing air to enter, giving the flames more oxygen to feed on. Once the temperature rose above a certain level, the solenoid would energize again, allowing the engine to turn another half revolution, pulling the chain back and closing the grate.

Parker valves are generally very sophisticated systems of this nature, all utilizing in some way the guiding concept of negative feedback - the means by which the desired or 'control' position of the device is contrasted with the actual position, and the 'negative' difference adjusted for.

The majority of electrohydraulic valves (an electromechanically enable form of hydraulic valve) are solenoid valve, as well as being, technically speaking, solenoid valves. Their response is to the pressures at play on the valve. By various means, usually computerized, Parker valves can calculate the pressure bearing down on their intake pipes and thus calculate the adjustment necessary to allow the appropriate amount of fluid through when desired.

Hydraulic pneumatic valves of this nature are capable of actuating a great deal more force than solenoid valves or pneumatic valves. However, because liquids are incompressible relative to gases, hydraulic Parker valves are generally reinforced to a far greater degree than pneumatic mechanisms, to ensure that the machine doesn't break under the onslaught of its own strength.

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