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Log splitter

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W.W.

01-27-2002 12:25:06

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my 5hp engine passed away-bit the dust. I'd like to put on an elec. motor as I split most of my wood in the shed. would 1750 rpms be ok and what hp. would I need

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Trucker

02-01-2002 22:09:27

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Re: log splitter in reply to W.W., 01-27-2002 12:25:06

A five horse gas motor is about the same as a 2and 1/2 horse electric motor.A motor rewinder told me an electric motor is half the horsepower of a gas motor to do the same job.Dont know about the rpm's.

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W.W.

01-29-2002 06:39:02

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Re: log splitter in reply to W.W., 01-27-2002 12:25:06

thanks everybody.

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tom

01-27-2002 16:56:07

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Re: log splitter in reply to W.W., 01-27-2002 12:25:06

Your 5hp gas engine turned at 3600 rpm, which is the speed it turned the hydraulic pump. IF you use an electric motor that spins at 1750 (half the speed), you will have to use pulleys to increase the speed to the pump, and you'll need more power to do it that way. Or, find a motor that turns 3600 rpm.

If you turn the hydraulic pump at 1750, instead of the original 3600, you won't get full pressure, or oil flow, and your splitter won't move fast, nor will it have much splitting power.

Most samll engines turn at 1750 at IDLE, and only create the rated HP at full throttle (3600). ANy engine speed less than 3600 on your engine, means you're creating less than 5 hp.

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snitkawl

01-27-2002 16:29:58

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Re: log splitter in reply to W.W., 01-27-2002 12:25:06

I have a 7.5 hp 3400 rpm, 220V single phase on my wood splitter and it works great. I think the others are right about the 3.5 being enough. I have the bigger one because I found it cheap. I made a mount for the pump that bolts right on the end of the motor, so the whole thing is a neat package.

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I think my splitter is in for big time trouble soon-PCC-AL

01-27-2002 16:23:37

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Re: log splitter in reply to W.W., 01-27-2002 12:25:06

I'm turning 60 right away and my splitter consists of 2 metal wedges, 1 wooden glut and a 30 pound (there abouts) wooden maul made out of cured ash. Do have one of them fancy store boughten metal splitters kinda like a heavy and wide headed axe that's good for little stuff.
Kind of like to know them math-i-mad-i-cal calculations when I'm gonna bite the dust.

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T. Beaver

01-27-2002 18:41:31

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Re: Re: log splitter in reply to I think my splitter is in for big time trouble soon-PCC-AL, 01-27-2002 16:23:37

This is not pure science; genetics play a part. Take the square root of your age (7.75) times the weight of your maul (30) divided by 2.5 equals about 93 years. You've got about 33 more years of splitting.

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Hmmm....

01-28-2002 17:41:09

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Re: Re: Re: log splitter in reply to T. Beaver, 01-27-2002 18:41:31

Based on all these calculations, if the average human makes about 1/4 horsepower and can split wood for hours, then a hydralic wood splitter should be able to run on a wound up rubber band!

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Helper

01-27-2002 13:31:41

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Re: log splitter in reply to W.W., 01-27-2002 12:25:06

I would run a 8 HP with a small pully on the pump and a larger pulley on the motor . If the oil will always be warm , you can reverse the pullies . A 220 volt would be the best with as short as a cord as possable .RPM seems standard .

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F14

01-27-2002 14:03:27

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Re: Re: log splitter in reply to Helper, 01-27-2002 13:31:41

Jeezum Crow! You priced 8HP electric motors lately? Or tried to pick one up?

There's a conversion factor for gas engine to electric motor horsepower somewhere, I'll try to find it. You don't need the HP rating on electic that you do on gas.

I expect it's still gonna be considerably more expensive to go electric. You'll definitely wanna go 220 tho.

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F14...Hmmmm

01-27-2002 14:13:09

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Re: Re: Re: log splitter in reply to F14, 01-27-2002 14:03:27

Can't find any references. I could be wrong here (that'd be a new experience....not) I'm working on the assumption that an electric motor is more efficient than a 4 stroke internal combustion engine which only produces power on 1 stroke out of four.

I'll still say a 8 horse gas engine will be a LOT cheaper than an 8 horse electric motor, assuming you need that big a motor.

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Dusty

01-27-2002 14:49:06

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Re: Re: Re: Re: log splitter in reply to F14...Hmmmm, 01-27-2002 14:13:09

Electric motor can be about 1/2 the size of gas engine. In this case I would go with a 3 horse, 230 volt.

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F14...Whew!

01-27-2002 14:56:53

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Re: Re: Re: Re: Re: log splitter in reply to Dusty, 01-27-2002 14:49:06

Thought fer a minute there I'd ruined my reputation!

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F14...Found it

01-27-2002 15:57:18

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Re: Re: Re: Re: Re: Re: log splitter in reply to F14...Whew!, 01-27-2002 14:56:53

Rule of thumb according to Northern Tool catalog is that 2/3HP Electric = 1 HP Hydraulic = 1 2/3HP Gas. Quick run through the calculator makes it about 2.5:1 in favor of the electric.

So if that's accurate, you could replace a 8HP gas motor with a 3.2 horse electric.

Right on, Dusty. Thanks.

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Dick R

01-28-2002 19:34:06

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Re: Re: Re: Re: Re: Re: Re: log splitter in reply to F14...Found it, 01-27-2002 15:57:18

Formula sounds good but don't forget to keep the cord as short as possible. Extension cords are out of the question. 220 volt motor should be preferable. Cord gauge as follows: 20 amp draw = 12ga, 30 amp draw = 10ga, 40 amp draw = 8ga, 50 amp draw = 6ga. The neoprene type cord with SO insulation is the best. It takes abuse and remains flexable in cold weather. Use good cord ends (plug) and tight connections. These above suggestions eliminate premature motor winding burn outs.

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