Determining motor size for a project ?

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Old 09-23-16, 07:05 AM
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Determining motor size for a project ?

I want to put an electric motor on my garden hose reel so it can wind the reel without hand-turning. I'm likely to have several questions, but my first is a basic one: how do I determine what size electric (AC or DC) motor I should use? The hose is 100' long and with water the total weight to pull along the grass is approx 30 lbs.

If it matters, it'll be pulling at a slow rate.
 
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Old 09-23-16, 09:08 AM
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Getting a motor I think is the easy part. The big first question is; how you will drive the hose reel? How do you intend to transmit the power from the motor to the reel?

 
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Old 09-23-16, 09:15 AM
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First question is - how are you planning to attach the motor to the reel? That ratio will help determine the size of the motor needed. I think most AC motors run around 1800 RPM. you would need to reduce that speed through pulleys or gearing. With the motor exposed to the elements, it and all connections must be water tight.

There's much more but this will give you a few things to think about.

Just checked the internet. Google powered hose reels. There are even water powered reels. For under $90, it may be a better choice then DIY, in this case.
 

Last edited by goldstar; 09-23-16 at 09:24 AM. Reason: Added info.
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Old 09-23-16, 09:28 AM
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I haven't decided yet and I have a lot to learn on this project. My desire is for the hose to be reeled in slowly so the reel is turning at approx 3 RPM. For this reason I suspect attaching the motor directly would not be worthwhile. At present my leading approach is to use either a chain (as shown in your photo) or a belt. Also, I'm concerned about slipping with a friction drive.
 
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Old 09-23-16, 09:32 AM
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Thanks for the input thus far. Please keep the thoughts coming. I considered purchasing an existing product but my need for the reel to turn at 3 RPMs means I'll most likely build it.
 
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Old 09-23-16, 10:53 AM
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Well, with whatever you choose the motor is probably going to be the easy part. How you power/drive the reel is going to be the difficult part requiring some metal fabrication. Also don't forget safety open gears and sprockets are great at pinching off fingers.
 
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Old 09-23-16, 11:34 AM
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Look thru the machinery and gearbox section at eBay for used options.

I'd use a gearbox/motor combination.
 
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Old 09-24-16, 04:59 AM
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Surpluss Center would also be another good place to look.
 
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Old 09-24-16, 07:05 AM
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Thanks for all the information. I'll be going with a gearbox and direct drive.
 
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