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Motor Hp Increase

Discussion in 'Grinders' started by gagan2001, Aug 18, 2017.

  1. gagan2001

    gagan2001 New Member

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    I'm 15 years olds d I have a bench grinder/ belt sander combo that has an hp of 1/2, it ain't really that good, is there a simple way to increase power and hp of this motor???
     
  2. wade7575

    wade7575 New Member

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    I'm not really sure if it could be done easily as I'm a knife collector and sharpening is more my thing.

    That being said however I used to run a lot of RC cars when I was younger and one thing remains the same no matter what when it comes to electric motors,with RC cars you have a Motor Pinion gear and a Spur gear on the outside of the transmission and how it works is like this.

    If you start out with a 78 tooth Spur gear and use a 18 tooth Pinion gear we will call that your stock gearing,now if you wanted to make the RC car go slower you would use a smaller pinion gear like a 15 tooth witch would have to spin more times then the 18 tooth would to make the 78 tooth gear spin faster,and the opposite would happen if you used a 22 tooth pinion it would not have to turn as many times to make the pinion turn once.

    Now if your grinder has a pulley on the motor that can be taken off and room to put another one in it's place you might be able to make something work,as far as taking the motor apart I wouldn't even attempt it.

    But something tell's me most likely the real answer will be to purchase a new belt grinder.

    You may also put an add up in for sale section and let people know that you are only 15 years old and if you are on a limited budget tell them what it is you are looking for you never know who may have something laying around that they are not using anymore and like I said you never know who may decide to sell you something for less then they may have taken from someone else as I'm sure they are lot's of people out there that would love to help the future of knife making by helping a young fellow like yourself.
     
  3. dancom

    dancom Dust Maker Best Shop Tool

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    I know a guy in Seattle that stuck a 1 hp motor to his Central Machinery 4" x 36" / disc combo. For how much I use mine for miscellaneous things I was wondering how hard it would be to stick a decent motor on it. He used a belt and put the motor at the back side. I'll see if I can get some pics from him.

    Dan
     
  4. FORGE

    FORGE Maker of the Year Best Knife

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    Sorry you can not increase HP. Horsepower is a function of torque and RPM .
    HP= TxRPM/63025 with the torque being measured in , Inch/pounds.
    So if you gear down the motor say by a 2:1 ratio, the speed drops in half and the torque now doubles and the HP stays the same.

    Think of it as a truck with a manual transmission, the HP under the hood never changes but by shifting gears the relationship between torque and RPM changes. In Low gear you can't go very fast but you have lots of torque and in high gear you don't have much torque but the speed increased. Again the horsepower of the engine remained constant.

    Even people that design equipment don't understand this concept. It amuses me to see air compressors or shop vacs rated at 5 and 6 HP that plug into a 115V, 15amp outlet. You just can not get 5hp from that plug in, but manufactures will rate their equipment with this HP rating which is impossible to achieve from a 115 volt service.
     
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  5. dancom

    dancom Dust Maker Best Shop Tool

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    Like my shop-vac is 6.5 "peak" horsepower. Let me see, that is 6.5 x 746 = 4849 watts or roughly 2 to 3 times a full household circuit. This is complete marketing bull-crappy. Vacuum manufacturers use the locked rotor current (which occurs for about 1/20th of a second when you first start the motor) and calculate the "peak horsepower" of their machines based on this. Reality is that a good shop-vac will pull about 1 hp or 750 watts continuously.

    One can increase the horsepower of an electric motor by increasing the voltage supplied to it. The formula P = E2/R will work to a degree, but there are many drawbacks, magnetic saturation, loss of efficiency, heating and the transformer required to do this is probably going to be more expensive than buying a new motor.

    So no magic bullets here.

    Dan
     
  6. gagan2001

    gagan2001 New Member

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    Thanks man I would appreciate it alot
     

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