12v linear actuators offer a high level of power, and are particularly useful when you need to automate the raising or lowering of some component of your car, such as the hood or trunk. Linear actuators are also often used in acoustic engineering, to move amp racks to which amplifiers are mounted by their faces or via slot grooves.
Typically, a 12v linear actuator will consist of a DC motor, which in turn will be connected to a screw drive. Via a set of gears, the rotation of the screw by the motor will move it up or down the threads of the bolt on which it’s set, creating a linear motion that can be transmitted to other components via connecting rods.
12v linear actuators are, despite their relatively slow speed, extremely strong. It’s necessary to install limit switches in most of them, as, if whatever you’re attempting to move runs out of moving space before the actuator achieves full extension, that often won’t be enough to stop the motion of the actuator. Linear actuators are, in fact, quite capable of tearing amp racks apart should the design suffer from a flaw in this department.
The sheer electromechanical hardiness and reliability of 12v linear actuators in terms of force output makes them ideal for rugged situations, as well as those in which miscalculation could lead to losses in terms of millions of dollars or, worse yet, human life. If one of the Hubble telescope’s numerous actuators fails, critical observational systems and control flaps may also fail to extend, resulting in a last-minute screw up that could prevent incredible sightings, such as the recent Hubble-Linear set of observations. The Linear comet’s explosion revealed, by way of its surviving fragments, a great deal of information regarding the comet’s interior, and hence about asteroids and, in some ways, the very nature of most celestial bodies. To have missed such an observation would have been a tragedy for human knowledge, even as, were the actuators responsible for the sealing of NASA shuttles’ airlocks less reliable than they are, the world might have suffered a tragic loss in terms of the astronauts on board.
Aside from the functionality of the Hubble linear motors in the highest of heights of space, 12v linear actuators are also known for their undiminished capabilities under extremely high pressures, such as those experienced during sub sea repair missions. It’s this that makes them such a vital electromechanical component in the remotely controlled servo robots so often sent into environments unsuitable for human divers, such as zones surrounding natural gas vents and oil drilling sites. Without them, sub sea repair missions would be fraught with peril, and call for a much longer timeline due to the constant need for divers to replenish their air supplies.
Honda Acura Transmission Dual Linear Solenoid 28250-P6H-024
Automotive Parts and Accessories (SINS)
Click is usually actuator arm not head crash2013-04-26 12:55:58 by RobNLA
The click can mean a head crash happened, and it may indicate that the head is being dragged on the platter, but it's not actually from the head hitting the platter.
In modern drives the clicking is almost always a result of the arm sweeping back and forth over the disk trying to get position data. The clicking sound is the back end of the actuator arm hitting the stop that constrains the arm's range of movement.
The clicking sound is usually caused by one of these:
1. Spindle motor failure/stuck spindle/bad power to motor
2. Circuit board failure
3. Read/write head failure
More ideas2009-09-01 13:40:40 by davidcarradineded
Try taping the drive, with your knuckle, may throw it in working
if you open the drive, do not get finger prints on the platter, its the oil from us that does the damage, not dust particles
the clicking you hear means the arm has scratched the disk, you might replace the head on the actuator arm, google it,
When you are replacing boards watch out for static electricity
I think its the head on the actuator arm, what fun
I back up my data three or four times now, jumbo drives are cheap now, and I also back up to dvd copies off site
(Never tried the freezing, I would worry about moisture...)
Fieldbus for steam-drain control — InTech
Ultimately, when you minimize signals, you improve the overall efficiency and performance of the network.
ACDelco 214-1073 Turbo Boost Solenoid
Automotive Parts and Accessories (ACDelco)