I apologise if this is the incorrect location to post this query. I am in the early stages of planning to build a flip down motorised flip down tv - Similar to that on the following website.
One of the things which has met torn in different directions with this project is the movement or motor element for the lift. I would like to hear collective different thoughts on the best motor to achieve the lift and hold which is required for the lift when the tv is stored away.
My two different options I see at present are
Stepper motor with electro-magnetic brake when when the TV is stored away
linear actuator
with option (1) i understand that a brake of some sort it required in the up position as a regular stepper motor will lose it's holding capacity when there is now power, it it my understanding the linear actuator will hold a load when not powered.
If i could hear any for's or against, or even another option it would really be appreciated.
When I designed tv lifts, we used a tubular motor to do the lifting.
The tubular motor was slipped inside steel tubing with s/s stranded cable to do the lifting.
In other words, it worked like a winch. The tubular motor has built in limit switches to control the amount of lift, and when the power is cut, it remains in that position.
Google tubular motor remote control for some ideas.
I ideally would like to do a 60" screen, so im looking at around ~30kgs in screen weight. Thanks for the idea i will certainly look into this further to see if this solution works for what I want to achieve.
Two linear actuators, one each side, seem the minimum safe means - no single point of failure and
fail-safe (can't be back driven). 30kg of steel falling uncontrollably only someone's head could
easily kill.
mundz:
I ideally would like to do a 60" screen, so im looking at around ~30kgs in screen weight. Thanks for the idea i will certainly look into this further to see if this solution works for what I want to achieve.
The ultra lift mercury slim is exactly what i am looking for. Unfortunately at 7-13k the price is simply not realistic.
Once i figure out the lifting ill be sorted. Im thinking alot along the lines of MarkT
MarkT:
Two linear actuators, one each side, seem the minimum safe means - no single point of failure and
fail-safe (can't be back driven).
For the design im thinking of a alloy subframes which the tv will attach to and then a steel frame for the unit housing. im also thinking placing the lift point ~150mm down the arm of the screen frame should look ok and reduce the pressure required to piviot from the end.
in terms of connection of one frame to the other i was going to use square set pillow bearings bolted to the frames if that makes sense
