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Tool Talk Discussion Forum

Elec. motor power

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b fullmer

01-04-2013 15:14:00




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Was wondering how elec chainsaw seems to have more power than a much larger motor say on a table saw




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John B.

01-05-2013 17:36:04




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 Re: Elec. motor power in reply to b fullmer, 01-04-2013 15:14:00  
On the table saw you have a leverage disadvantage with the large blade. If you have a 7 1/4" blade you're trying to spin the board has that much more leverage to hold it back. If you had just a blade half that diameter it would have more power. Just my two cents. But like many have said there are more factors involved that what I just mentioned here.



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ss55

01-05-2013 12:10:49




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 Re: Elec. motor power in reply to b fullmer, 01-04-2013 15:14:00  
Compare the amperage and voltage going into the motors. They don't make more power than what goes in through the power cord.

The chain saw motors may be designed made to slip (lug down) more than the table saw motor. Slip gives more torque but less efficiency.



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buickanddeere

01-05-2013 06:48:59




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 Re: Elec. motor power in reply to b fullmer, 01-04-2013 15:14:00  
Peak and continuous ratings. Also an 8000rpm series motor will make more power in a given sized package than a 3450rpm induction motor. It's an apples and oranges consideration. Next we are going to have some twit tell us that a 5HP electric motor does more work than a 5HP gas engine. Seems to be a lack of understanding torque rise and intermittent duty.



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John T

01-05-2013 06:23:01




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 Re: Elec. motor power in reply to b fullmer, 01-04-2013 15:14:00  
Theres just so much HYPE and BS and half truths nowadays and so many (supposedly???)different ways to "advertise" HP its hard to keep up lol. My 1938 John Deere B was "advertised and sold" in 1938 as like 12 HP while my lawn mower is "advertised and sold" as having 25 HP.

Sooooooooo weigh down and tire up and gear the mower as you like, (heck pull out the JD engine and stick the 25 HP lawn engine in its place if you will) just wonder if it will pull a 12 or 14 inch plow 8 inches deep in hard clay?????? Hmmmmmmmmmmmm

John T

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George Marsh

01-05-2013 03:53:26




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 Re: Elec. motor power in reply to b fullmer, 01-04-2013 15:14:00  
Do liers figure or do figures lie? Horespower can be calculated many ways. If you want your figures to lie, you will rate things in peak horsepower. Like my craftsman shop vac, 6 peak hp. There is no way you can get 6 hp with 110v and 12 amps.

Like Briggs got in trouble over rating their engines hp, electric motors on saws are over rated.



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da.bees

01-04-2013 20:38:30




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 Re: Elec. motor power in reply to PJH, 01-04-2013 15:14:00  
Also undrstand that mfgrs don't use same method of establishing HP rateing. I have a 1.2 HP Delta table saw that has more power than my 3 HP Craftsman.



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Dean

01-04-2013 20:26:05




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 Re: Elec. motor power in reply to b fullmer, 01-04-2013 15:14:00  
Greatly oversimplified, electric motor size is a function of several factors including duty cycle.

The DC chain saw motor is certainly rated for intermittant duty while the AC induction motor on your table saw is rated for much higher duty cycle.

If the DC chain saw motor was rated for the same duty cycle as the chain saw motor and the same HP, you would not be able to carry the saw and battery pack necessary to operate it.

Dean

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Stephen Newell

01-04-2013 18:15:16




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 Re: Elec. motor power in reply to b fullmer, 01-04-2013 15:14:00  
I think if you had a table saw blade with chain saw teeth you would think the opposite.



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