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Drying Wheel Speeds
48 replies to this topic
Posted 12 September 2010 - 12:16 PM
Sorry that you are not getting the results.
See if you can find any local electronic component supply shops, back alley shops, not mall. They usually carry a lot of second hand stuff and will likely have a box of motors for you to sift through. I have no shopping experience in USA, but this is how it works in UK and here in Indonesia.
Good luck with the project, stick with it.
Posted 14 September 2010 - 01:33 AM
A worm gear arrangement would get your rotation speeds down. 50:1 ratio would be easily achievable. Plastic gear kits should be available in model shops or try electronic component web sites, like RS components or Maplin. I know maplin have them.
Posted 14 September 2010 - 01:35 AM
Posted 14 September 2010 - 11:04 AM
Not all motors are "dimmable", and not all dimmers work as motor speed controls. That may be the problem you're having.
I know I've run into this on jobsites, but you'd have to talk to an electrician, or a motor supplier, to find out exactly why, and which motors/dimmers work.
Posted 14 September 2010 - 12:54 PM
Just had a thought and it may or may not work. Has anyone ever tried using a windshield wiper motor for their lure turner? You'd have to get an ac/dc converter, but they aren't that expensive and the wiper motor would be more than powerful enough to turn even large drying wheels. And if memory serves me correctly most dc motors are capable of having their speed adjusted by varying the amount of current supplied to them so maybe a dimmer would work??
OK. Now you can go ahead and make fun of me for coming up with another crazy idea.
Sorry if I hijacked your thread Dave.
Edited by RayburnGuy, 14 September 2010 - 12:57 PM.
Posted 14 September 2010 - 01:55 PM
No problem here with the hijack, the main discussion had run its course anyway.
The wiper motor is a powerful motor and should be readily available as a second hand/scrap part, at a reasonable price.
I cannot remember the speed of the motor, but it is still going to be way too fast and will require adjustment. The standard dimmer switch is not going to work for this motor, firstly it is too powerful for a light dimmer to handle, secondly, the dimmers are designed for 110file:///C:/DOCUME%7E1/DAVEWE%7E1/LOCALS%7E1/Temp/moz-screenshot.pngV A/C. To control this motor would require a very heavy rheostat or some fancy electronics.
Posted 14 September 2010 - 09:15 PM
I'm thinking the rheostat on a cars light switch might do the job. The one I'm talking about is the one on the headlight switch that is turned one way or another to brighten or dim the dash lights. Years ago we used these to construct our own lights for coon hunting. By using this rheostat you could brighten or dim your head lamp so that a raccoon that was "light shy" wouldn't hide from you. Of course this was way before any of the modern head lamps with this feature had been invented. Just another idea I should have gotten a patent on.
Posted 14 September 2010 - 11:52 PM
A regular headlamp bulb is 55 Watts and at 12 Volts will use 4.5 Amperes (W = V x I). There are two of them, so the rheostat must be designed to take at least 9 Amperes plus a design consideration for heavier, higher performance bulbs plus a safety factor so that they don't blow out too often.
I did a search on wiper motors and the heaviest power number I could see was 75 Watts, most motors being half this number. So your design idea of the headlamp rheostat is a good one and should work. But Mark's comments will still apply. Whether or not you could slow it down sufficiently before the motor stalls, I cannot say.
Edited by Vodkaman, 14 September 2010 - 11:55 PM.