Dayton 7.5 hp?

J

jawilder

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Jun 27, 2006
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I found two Dayton 7.5 HP motors for sale at the local resale/junk/whatever store. Of course they are 3ph and I really can't do anything with them right now but maybe in the futre? A press is about the only thing I can think to use one for.

He wants $150 each for them but I don't know if that is a good price for a motor that won't get used in a long time.

What are your thoughts? Should I grab one? Grab both and sell one? Grab both and resale both?

What can I do with a motor so big?
 
Chances are good that they will still be there whenever you get a need for one. These don't move fast. I have seen them sell for $50.They also take a lot of power to run, and a BIG expensive VFD.

Unless you have 3Ph power to your shop, you would be far better off to look for a 2-3HP3Ph motor and get an affordable VFD that you can run off the 220VAC1Ph power you have in the shop.
 
Might be perfect for making a phase converter with, although the price isn't great. I've found the capacity of a 5hp rotary ph converter to be just low enough to piss me off. Since replacing my 5er with a 10hp commercial model, I'm seriously contemplating selling it and replacing with a 20.

Anyway, 7.5hp should be enough to start most machines in a small shop, so that's a good use. I doubt you'll be needing a motor that big otherwise. Most people I know built their presses with single phase compressor motors.
 
What Bladsmth said.

You'ld need a 50 amp 220V circuit to run one. You might have to get them rebuilt. Are the motors TEFC or HVAC? I don't know what a VFD would cost but it is probably more than $1k.
 
I have a Baldor 7.5hp I've been trying to sell for under $200 for a long time. Nobody seems to want one.
 
1-5hp motors are really the only ones in demand. Mostly for the sort of applications we use them for. I think aspiring grinder builders are the single largest cause of 1-3hp tefc 3ph motor prices on ebay. If you look at 56c motors in particular, its obvious that people are catching on. Of course lots of medium sized machinery uses these motors. Saws, mills, lathes, etc, and lots of hobbiests are rebuilding old machines these days.

The other exception is single phase compressor motors, 5, 7.5, and the rare 10 horser. Any of these are a super easy sell. Also some large, 50hp or higher motors can be very valuable if you can find a buyer, but even at scrap prices, can be a big investment to acquire.

I pick up all the 1-3hp tefc motors I can find, jic, but for every one I find that's good, I pass on dozens of 5hp+ motors.
 
javand said:
I think aspiring grinder builders are the single largest cause of 1-3hp tefc 3ph motor prices on ebay. If you look at 56c motors in particular, its obvious that people are catching on. .
Click to expand...

I've noticed that too.

Lot's of people are converting lathes, bandsaws, whatever to vfd power and the 3 phase motors seem to have gone up in price.
 
I've got a Baldor 7.5 too. A used vfd of good quality would be 1k. Depending on what you are using it for, maybe you only need 3 or 4 speeds, and don't have to change it too often. Pulleys are cheap.

I was thinking of using mine for an exhaust fan. It can pull air at low speed when I'm forging or welding, and it would go up past enough to paint cars in my spray booth. (My metal shop goes straight to paint room, and I filter the air before it comes in the spray room when I'm finishing something .)

I had a 5hp 24" fan in my last paint booth, and it worked fine, but it was full on, and noisy as heck.

I can't think of a better use for a motor that big, but I'd sure be willing to listen.
 
Thanks guys. That's kind of what I figured. It will be way too expensive to do anything with. I'll pass and wait for him to get something smaller.
 
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