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Old 10-21-2004, 10:30 PM   #1
imprezive one
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Default will a 1/4 HP motor be enough for this project?

Hi guys. I'm starting a project to make a custom pop up LCD housing for my 7" xenarc touchscreen VGA monitor and I have everything designed out but I need a small electric motor to power the whole thing. Basically I need the motor to have enough power to push the screen out via a gear that is driven down a track. The motor I have in mind is rated at 1/4 hp when given a 12v power source. My question to all the engineers is, how much in real life terms is 1/4 hp? Will it be enough to push my screen out or will it just cease up and be too weak? I guess I could always get two of them and have them drive gears on both sides of the screen down two different tracks if one doesn't suffice but I'd really prefer to keep it as simple as possible. What do you think? The screen weighs in at around 1.3 lbs.

Thanks.

-DK
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Old 10-21-2004, 10:48 PM   #2
JeffrWRX
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I don't know if this helps, but I got a .9 HP motor on my RC truck and it can go about 35 MPH and it weighs more than that screen does (3-5 LBS). So I think you'll be ok. Depends on if you want it to fly open or creep open

sorry if this post is useless.

-Jeff
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Old 10-21-2004, 10:49 PM   #3
Ulf Wafflestein
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you can filter pools with 1/2 hp motors, so I'm guessing 1/4 is MORE than enough to move a little plastic LCD screen out of the dash with.
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Old 10-21-2004, 10:54 PM   #4
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pm mattjk
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Old 10-21-2004, 11:22 PM   #5
imprezive one
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Quote:
Originally Posted by MyScoobie28
pm mattjk

I've owned and had a mattjk screen installed previously. I love his work but the whole reason I'm doing this project is because I want something that hides away in a very specific manner. Thanks for the tip though and thanks for the info guys, I think this should work nicely.
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Old 10-21-2004, 11:58 PM   #6
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Yeah, garbage disposals are only like .5 horsepower, i think you'll be good.
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Old 10-22-2004, 01:26 AM   #7
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What do you plan to do?
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Old 10-22-2004, 07:37 AM   #8
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I'D say 1/4 HP will be more than enough for what you want to do. As a mechanical engineering tech, I would say that be careful with your gear design. You could end with something too quick that would destroy your equipment if collision happen, or something too slow with too much torque that won't stop even if blocked and damage occur again. to give you a better idea what represent an 1/4 hp (or any hp amount), find the rpm at wich your engine produce 1/4 HP. then what you do is (0.25x5252)/rpm and you end with the torque in lb*ft. put a 1 feet arm right on your engine gear, and that the weight the engine will be able to hold.

Just do the math before beginning to build just to be sure you won't get a flying screen going throught the back glass, or a bulldozer screen that will bring your ventilation system with it. I would try to have a target "screen output speed" around the same that a drawer-type cd player have.
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Old 10-22-2004, 12:03 PM   #9
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Ever see or hear about a restaurant that spins? Think Seattle's Space Needle, or Honolulu's Top of Waikiki Restaurant...
Did you know the motor in that is only 5HP?

Is all about gearing...
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Old 10-22-2004, 12:03 PM   #10
imprezive one
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Great info/advice NicEJ25, that's the exact response I was looking for. I was planning on making a mock up version outside of the car and testing everything before-hand for the very reasons that you listed (not to mention it would just be easier to work with outside of the car). I don't expect this to be done any time soon. As with anything that is done right it's going to take a lot of time and planning, which I'm fully aware of. I like challenging myself in that regard.

N'CNTRL, I don't want to reveal anything just yet because (1) if the project gets put on the back burner due to time constraints then I won't have anything to show for it for a while, and (2) I'm working on this with a friend that might have some commercial interest in it - so for intellectual property reasons.

*I will say though that our goal is to have the screen fold away in such a manner that absolutely nothing is visible when it is retracted (meaning no part of the cradle that it slides out of can be seen externally).
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Old 10-22-2004, 12:29 PM   #11
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As a safety precaution, you could always current limit your motor and drive it with a PWM signal to control the speed. You can then just alter the values in the code and you will be able to tailor the speed and strength to something that is functional and asthetic.
This way you have the basic code, control system and motor to be able to move various sized screens in different installations.
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Old 10-22-2004, 05:38 PM   #12
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Another way to accomplish what your looking to do might be springs. A properly sized spring could replicate the same motion you want to accomplish with the motor AND be less components/headache to worry about.

Just a thought from the KISS dept.

mike
BSME, 1996
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Old 10-22-2004, 09:24 PM   #13
imprezive one
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Quote:
Originally Posted by newscooby
Another way to accomplish what your looking to do might be springs. A properly sized spring could replicate the same motion you want to accomplish with the motor AND be less components/headache to worry about.

Just a thought from the KISS dept.

mike
BSME, 1996

Excellent idea, although one that was already considered long ago and was opted out of. I'm all for keeping things as simple as possible as well, but there are just certain goals that we set out to reach with this setup that we absolutely will not compromise on. We've already trimmed the idea down quite a bit and streamlined it to avoid any unnecessary problems and there's still a long way to go until completion. Thanks for the input.
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Old 10-23-2004, 08:26 PM   #14
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Default Popup LCD

Have you seen this? It comes non/motorized.

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Old 10-23-2004, 08:56 PM   #15
imprezive one
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Quote:
Originally Posted by 2002WRX_5speed
Have you seen this? It comes non/motorized.


Yup. Believe me, I've been thru every possible pre-made solution there is. That design (nor any other that I've searched out) will not work for what i'm trying to do. That's why I'm doing this as a custom setup. If there were something out there that I could just buy and save a lot of time, energy, and probably money on, I would do it. Thanks for posting it though, appreciate it.
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Old 10-23-2004, 10:09 PM   #16
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not to hijack, but how does that non-motorized screen work?? do u have to push it back into the housing to retract it? are there any links....thats pretty cool!
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Old 10-23-2004, 11:09 PM   #17
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Arent garage doors like 1 hp?
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Old 10-23-2004, 11:16 PM   #18
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Note:

I've done a number of motor applications, usually as part of a computer controller or robotics.

1. Use a DC pulse to drive the motor, this will let you fine tune how fast the unit operates.

2. The HP of the motor is not nearly as important as the starting torque. You probably want a relatively slow motor with relatively high starting torque.

Good Luck.
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Old 10-24-2004, 12:36 AM   #19
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thats a lot of power, my schools solar car has 3 1/2 hp and we can do like 20 in it.
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Old 10-24-2004, 03:59 AM   #20
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Sounds as if one is working on a screen that will pop or moterize out of the top of the dash posibly in the factroy clock area,errr

I hate being a installer when it comes to kool stuff like this because it gives me so many great ideas to rip my car apart,lol

joe r
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Old 10-24-2004, 06:20 AM   #21
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You mean something more like this. This design is for plasma but I think the idea is the same.

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Old 10-24-2004, 02:24 PM   #22
imprezive one
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AntiochCali, thanks for the advice. I'll keep all of that in mind.

BaylorRS, if you want some more info on that non-motorized housing (as well as a lot of other cool car computer related stuff) go here . You can also peruse the mp3car.com boards for a lot of info on car computers.


Quote:
Originally Posted by 2002WRX_5speed
You mean something more like this. This design is for plasma but I think the idea is the same.
Getting colder...
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