What motor should I look into for lifting 50 lbs around 35-40 in. off the ground?

I have a project where I very simply need to raise and lower a flat board with a 50 lbs drill press 35-40 in. and have it stop at the same specific place every time going up and coming down.

I've seen TV lift mechanisms and things such as that, but they cost $500 - $1,400. I need this project to cost very little. <$100 if possible. I have a scissor design that I will be made from wood that I already have, so all I need is a motor that can lift 50 lbs up and down, slowly, quietly, and only once or twice a week. But I know nothing about motors. 

Here are all the parameters that I can think of. 

1.) It will be stationary, i.e. — not require a battery or ever need to be moved. 
2.) It must move slowly. Lift the surface approx. 1 in per second. i.e. — around 30 seconds to raise the surface 30 in. or so. 
3.) It must be as quiet as is reasonable. It doesn't have to be whisper quiet, but def. not power-drill loud.
4.) It must be as inexpensive as possible. 

I do not care about...
1.) Motor weight
2.) Dimensions
3.) Power consumption
4.) Heat production
5.) Longevity... it will be used very rarely so wear & tear is a non-issue really

I very much appreciate any help you guys can give. 



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thank you

Toga_Dan4 months ago

garage door opener ?

Toga_Dan4 months ago

linear actuator.

Google. Shopping.

Dolmetscher007 (author)  Toga_Dan4 months ago

I looked into linear actuators and that looks to be perfect. In fact, Firgelli Automations has a TON of them online, and they also sell... TV Lift systems, just like I mentioned. And their TV lifts seem to just be one of their Linear Actuators designed into a telescopic mounting system, JUST like I want to build. They even sell "column lifts" that are essentially TV lifts without the TV mounting brackets. But they are till $300. I was looking to spend <$100 and build it myself. I may be dreaming.

iceng4 months ago

A drill makes to much noise.. I would use a quiet $150 gear motor which uses AC line and can be reversed by exchanging the second wire with the third wire.. So it is easy to control with relays and micro switches..

Yonatan24 iceng4 months ago

I have a small BOSCH 10.8V cordless drill that isn't really loud... Com[ared to my other drills, and is pretty strong for its size, I guess.

How about a linear actuator?

Or a motor with a threaded rod attached to it (welded?)

Dolmetscher007 (author)  iceng4 months ago

I did think that AC was better than DC for this, but only because I have always thought that DC is for applications that require batteries, and that you use an AC motor in situations that will be plugged into a wall outlet.

I found this TV lift kit after watching a lot of YouTube, and the specifications are literally EXACTLY what I need:https://www.touchstonehomeproducts.com/products/th...

It raises a load of up to 100 lbs, quietly, and slowly, up to 68 inches into the air. All it says is that the motor is 24V. I can't seem to find any other specs on the motor they use.

::::::::::::::::::::::::::::::::::

iceng: The gear motor that you talked about... you talked about switching it direction by switching wires etc. I am not knowledgeable at all about electronics. Is this possible to do once with some configuration, and then be able to control the up and down (turn left, turn right) from a three way switch [Up - Stop - Down]?

iceng iceng4 months ago

Do click on the pics to see the entire image.

REVESE gearmotorLimSWS.bmpRigid_Chain_A1ctuator.gif
Toga_Dan4 months ago

u may wanna look at designs of drywall lifts, forklifts, etc. Cables, pulleys, etc .

Downunder35m4 months ago

The motor is not your problem, the mechanics and reduction gear is.
You either need a DC motor or a switchable gearbox to change the direction of the motor.
If your sissor system is up for the load and without too much play you can use it but be aware those need quite some force to move a load that heavy.
As for motors and budget:
Take a look at winder motors for car windows or better still those that adjust the seat position.
The later are found in the base of the seat and come with screw drive.
To make things work for such a load you best option is using a threaded rod and nut.
Nut is fixed in place (with a flexible mount or fixed) and the motor drives the screw.
Like this you get a lot of torque even if the motor is small.
To make it stop in the same position use a microswitch that operates a relay to interrupt the voltage to the motor.
The seat motors should have wires for both directions so even with the switch activated you can always go back with the motor, just not any further.

Takes some building and fixing to get the screw onto the motor but is the cheapest option I can think of that is reliable enough.
Of course you could substitude the motor with your cordless drill and the drive screw end fixed in a bearing so you just attach the drill.
But I would only recommend this way if can make sure the screw and all is mounted to allow for this to work properly.