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Electric motor

Started by iain, June 05, 2005, 04:13:28 PM

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iain

Can anyone tell me the size (hp) of three phase motor
or two motors (one either end) i would need to replace two 084's on a twin head slabber,
the slabber is not built yet but i got all the doings now, and there is a bit of time coming up at the end of July 8)                   maybe ::)


           iain

D._Frederick

Go with 20 hp, you should be safe.

caryr

20 HP should be much more than safe. Mobile Dimension uses a 57 or 67 HP 4 stroke gas motor, but only 40 total HP when they use electric. I can attest that the electric setup cuts significantly fast even though it has less HP. Given that the 084s are around 8 HP each you should be able to get by with 10-15 HP. Also, I think Logosol has both an electric and 2 stroke gas option for their mill, but as I remember they use a slightly larger HP electric motor for almost twice the cutting speed.

Cary

iain

Was thinking of around 10hp per end to spread the load and the wear?



iain

caryr

Iain,

Just in case you misunderstood the 10-15 HP I was referring to was total, so 10 at each end should really fly.

Cary

iain

How about a 4hp on each end?
cause i some of them that need some thing to do cept collect dust

caryr

My guess is that might be a bit underpowered compared to the two 084s, but it is worth trying since the price is right. I would make sure the mounting was done in a manner that would allow you to easily upgrade the motors if needed.

One thing to look out for is that if the two motors do not have matched torque vs slip (speed) curves one of the motors will likely take most of the load and could overheat. If you don't have the curves for the motors (likely) just set everything up and put it under a moderate load and then verify that both motors are pulling similar current.

Cary

iain

The motors as identical, and were running as matched pairs i've got 16 of them


  iain

caryr

Prematched pairs and spares to boot! Sounds like a winning combination to me, though I would still double check the currents under load  just to be safe.

Cary

iain

Will do my old sausage
i think i will start with what i got and up them to more ponys as the bigger ones become available to me
i dont need the others as spares i change the bearings 7mins and about $15 each =  good as new 8)
they aint done much in there past life



thanks iain

mometal77

Call me dumb you mean for the sawmill to go up and down?
I saw a guy have just a 12volt windshield motor on his in my yahoo pics you can see it.
http://photos.yahoo.com/goober077
plus mobile dimension just sent me paperwork and a booklet on one with two chains on it.
If you ever go to three phase i will tell you how to convert it just using a single phase motor. Without buying a 2000 phase converter lol
any help
bob
deming,wa
Too many Assholes... not enough bullets..."I might have become a millionaire, but I chose to become a tramp!

caryr

Bob,

Unless I am mistaken Iain has or is having made a really long chainsaw bar that can have engines/motors put on either end. One pulling the chain down the front of the bar the other pulling it down the back. This setup is great for splitting, quartering big logs to fit on a conventional mill or for making very wide slabs.

Cary

Furby

But I thought that electric was supposed to be two to three times what gas is.
Meaning that if you now have 16 horse with the two 084's, 6-10 horse total electric should work, right?

Also, I would put a sprocket on one end of the bar and try it with just one motor and see what happens. ;)

mike_van

I always understood that an engine was 50-60% efficient, and electric was 90%.   Or, 10 hp gas = 5 to 6 usable hp  and 10 hp electric = 9 usable  hp    ????????
I was the smartest 16 year old I ever knew.

D._Frederick

Don't forget that your chain saw engine is running in the 10,000 to 12,000 rpm range while sawing, 3600 rpm is all you are going to get out of a motor.  To get the same cutting speed from the motor, requires increasing the the motor speed by 300% to drive the chain sprocket. This reduce the motor torque to 1/3. An electric motor puts out 1 1/2 ft-lbs of torque per hp for a 3600rpm out put, figure backwards from the chain sprocket to get the correct size of motor.

Your little 4 hp motors will not provide the cutting speed of the chain saw engines,  you will be lucky to get 25% of the speed.

mometal77

Cary
I have never seen this set up before.  Know of any pics? It is true though that electric is better than gas.  Depending on if you have a long enough cord hehe..
bob
Too many Assholes... not enough bullets..."I might have become a millionaire, but I chose to become a tramp!

iain

The set up im thinking of can have either the two 84's, or the electric i've got both in the workshop, waiting for me to make up my mind ::) if two 4hp's wont work i'll wait for bigger motors

the reason for splitting the power is cause i got the two heads and the motors, im used to that set up (twin 075's with a sperber frame) and it will cut out the power loss as the chain turns for home

i would like a set up like the peterson / lucas rails and slabber, but better slabber as i've got a stupid amount of big trees to cut up, i'll sort the pics to show what i mean, and i also want them as wide slabs, with bark on both sides

i can build a box around from 18mm ply and polystyrene and hang the fans and dehumed unit, 

4" of poly on the concrete two layers of ply, plastic dpm sheet and you have the floor, nearly the same for the walls    bingo kiln   
the biggest i've made so far was for a splated beech log that weighed in at 24' long and 48" big end 36" small cut 2" through and through at a big mill, stickered of the mill stacked and loaded with their over head crane,
hiab the whole strapped lot of the lorry at my end 4hrs later the fans were switched on 28days later 9%



iain

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