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| motor advice for rotating crt setup |
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| Ed_McCarron:
Yeah, the heck with this simple 90 degree rotation... Lets shoot for 270. Make it interesting. |
| DaOld Man:
Yeah, that would make a game of pacman very interesting.. :laugh2: |
| Cornchip:
Stay away from the 24 VDC (military voltage). Power supplies are uncommon. I used a power supply that was affordable and most importantly safe. I bought a Pyramid 12 VDC 15 AMP PS-15KX dedicated power supply for the job. I cost me 60 dollars. It is circuit protected....so you don't even need a fuse. Wire something wrong and nothing blows or burns. I can't stress enough the safety behind having reliable proven electrics in your cab. I also use it to power my LED's and audio Amp. Oh...I should mention the AMP draw of a power window motor. Free no load running is supposed to be @ 2-3 AMPS. Full load (something binding) could cause it to peak past an amazing 20 AMP's. If you try that off a PC power supply things will happen! I ran an in line Watt's meter and saw less than the 2 amps while moving the monitor. Mind you I reduced the shaft RPM of the motor from 165 to 3 at the monitor drive shaft. Big time torque (more power is needed to move an object at it's center line than it's circumference). About that motor. It can be found surplus at a good price (for a new item...you can't go wrong). The make is Nippondenso (Toyota OEM) and is #30556-7030. It can be bought for 20 bucks (like I said before...it's new as well!). You won't find one at a wreckers for less. And here's why it stands out from other motors. It has a shaft 9MM in diameter versus the more common gear that all others have. It will adapt easy to a project like this. This motor is popular with the Robot Wars crowd. Here's an example on line surplus shop. http://www.skycraftsurplus.com/index.asp?PageAction=VIEWPROD&ProdID=814 Also...resist driving a DC motor with less than it's rated voltage. Severe heating will fry the motor (as Volt's drop ... Amps increase). Touch the case of the motor as you will see. I'm sure this rope system is a win. What do you do for a living Jimbo? Do you have the means to make a rope pulley? I see that stopping you unless you have some access to a machine shop. Some quality work here will pay big in the end. Cornchip. |
| Ed_McCarron:
--- Quote from: Cornchip on October 10, 2007, 05:46:11 pm --- Stay away from the 24 VDC (military voltage). Power supplies are uncommon. --- End quote --- Sorry, but I'll disagree. 24vdc may be ALSO a military voltage, but its the standard for pretty much any PLC in the industrial world. Ebay starts around $5 for a 2.5A model. |
| Cornchip:
Yes you are correct. Just about any panel you look in will have a 24 VDC in industry (DIN Rail). I can't say why the US military went with 24 VDC at a time when the typical US car used 6VDC. The obvious would be that higher voltage is just more efficient....or that two batteries were better than one. If 24 works for you...go for it. Cornchip. |
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