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See hydraulicspneumatics.com for fluid power formulas that will allow computing the size of motor required. … A slower, less powerful motor would support either less flow or lower pressure. …

The gear trains in many printers and multifunction devices, and in some scanners, have a transfer gear that drives two different gears, depending on which way the drive motor is running. … The 1970MC has one drive motor to power four different operations: printer paper pickup, printer paper drive, scan sheet pickup, and scan sheet drive. …

An N20 gear motor apparently has a 3 mm diameter shaft; one of the shaft collars below is 3 mm. The pictured thrust bearing is 2.5 mm bore. …

To control the motor with logic gates, you could make a circuit with a monostable multivibrator (or “one-shot”), an R-S flipflop (or R-S latch), and an AND gate or an OR gate to combine the one-shot and … You would use an AND if you want the motor to run when both the latch and the one-shot are active, vs an OR to make the motor run when either of them is active. …

If you have several sizes of power resistors available, you could connect a DC generator (or a DC motor used as a generator) to a resistor and use that system as a load on the motor under test. …

Also consider using a slip clutch between the motor and the door operator. It would allow the motor to keep running, instead of stalling, if door motion is blocked. … If you use a gear motor, then gear train wear and tear (which doesn't a priori depend on motor type, but may depend on motor speed) may be more of a limiting factor than is motor life. …

See the second answer there for drawings of one possible arrangement of the motor driving the plate. … Without stepper acceleration and deceleration, you risk losing pulses, which would lead to inaccuracy, due to exceeding stepper motor torque limits. …

As the motor rotates, the yellow wire will alternately be pulled up to V+ through a 10K resistor, and to ground via an NPN transistor. …

A variety of techniques are used for propeller shaft sealing. One of the most common is a "packing gland" or "stuffing box", as in illustration below from a dieselduck.info web page which has details …

The accepted answer to your previous question presents several ways of developing enough drive for the vibrating motor, in its section called “Converting PWM signals into something that can drive a motor … You probably would need to add one clamp diode per motor. …

Various motor starters are available that shut off in case of overload. … More-modern motor starters may use Hall-effect sensors. …

To compute actual values of torque, speed, current, power, and efficiency for this motor at various operating points, use the Basic DC motor equations given in wikipedia's Brushed DC electric motor article … Most of the parameters needed for the calculations are given in the Banebots RS-550 motor page, which apply when the motor is powered by 12VDC. …

direction of motor turns. … motor. …

A machinedesign.com article, “Exclusive interview: Gill Pratt on how compliant actuators revolutionized robotics”, includes a close-up picture of an SEA (series elastic actuator) mechanism developed …

You could push on one side of a bell crank with the end of the motor shaft, and use a spring return for the other direction if it is difficult to attach to the shaft. …