Motor Project

[mikeyv]

Hello,

I understand this may not be the right forum for this type of post, but I hope that you guys can shed some light on the subject.

I am building a plasma display mount for small space application. I have the frame welded and it will sit in a wall so as to be able to rotate between two rooms. I understand what I need, and the parts I need to accomplish it, but no idea if I am approaching it with the correct parts, and where to acquire them. Basically I would like to use an RF receiver, motor, and some sort of limiting device to rotate to a point, and shut off the motor. When the remote is toggled, the frame would rotate 180 degrees and then stop. Preferably toggling it again would reverse the direction, but constant 360 should be fine.

I'd appreciate any tips, suggestions, or links to places where I might get the parts i need. The TV is about 73 lbs, and I would be mounting the motor at the top.

Thanks in advance for any help.

Mike

 

[itsmoked]

At first glance I would say you want to use two of the wireless light switches. Set it up so each time you turn one on it starts the process. You put one in each room then flick them on and off. The rotation starts and runs like a windshield wiper that will complete its motion.

There are lots of ways to do this. Optical would work too.

On the motor end usually the motor would be reversible and have a cam associated with it. Once the motor/assembly starts to move the cam operates a microswitch following the cam that then forces the motor on permanently. So to test it all you would need to do is give the unit a slight push then the switch would close and keep the whole thing turning. At the the stop position the switch would be opened by the cam shape. Everything is reversed to move the unit back the other direction.

 

[Barry1961]

If possible measure the torque required to rotate the TV. One way would be to rotate the TV with a cheap fish scale the multiple the force by the distance to the pivot. For example if it takes 3lb of force to rotate the TV 24" from the pivot it would be 72 in-lb. Make sure all cables are connected during test. Get a gear motor with at least double the measured torque rating.

Since the gear reduction is going to be very high you need to be aware that the gearbox will probably be gear limited. This means that if something sticks a gear inside box will strip. Throw it away and buy another. If you were thinking of use hard stops be very careful. For example if you have a 1/10hp gear motor with a 600:1 reduction the theoretical torque would be 3.6 in-lb x 600=2160 in-lb. If it is rated way below this beware. Many of these boxes will have plastic high speed input gear.

Barry1916