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post #1 of 6 (permalink) Old 11-20-2009, 12:28 AM Thread Starter
 
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Default Band saw question

I am refurbishing a 20 Davis & Wells bandsaw. It will have a new very heavy duty 3HP single phase 220 volt moter. I will be one speed. I need so size the moter pully and would like to know the best, if there is one, blade speed. I would like to be able to resaw as well as general woodwork. The speed I have seen run from 2000 to 4750 SFPM. Thanks for any advise you can give, Melvin
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post #2 of 6 (permalink) Old 11-20-2009, 02:31 AM
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Melvin,

If I'm reading you correctly and you're asking for the best pulley size, that will be very dependent on the size of the other pulley and the motor speed. The speed of the belt wheel will be the (speed of motor * diameter of motor pulley / diameter of the pulley on the wheel).

Based upon the saw having a 20" wheel diameter, that's about 5' of blade movement per rotation. To get 2000 to 4750 SFPM, that wheel needs to turn at 400 - 950 rpm.

If the motor is 1800 RPM, you need the motor pulley to be 22% of the wheel pulley diameter to get 2000SFPM. A 2" motor pulley to 8" wheel pulley (or 2.5" and 10", or a 3" and 12")would make the wheel turn at about 450 RPM or about 2250 SFPM.

With that 1800 RPM motor, the motor pulley needs to be about 53% of the wheel pulley diameter to get 4750 SFPM. A 3" motor pulley and a 6" wheel pulley (of 4" and 8") would make the wheel turn at about 900 rpm or about 4,500 SFPM.

An 1800 RPM motor typically runs a bit slower than 1800 rpm and the actual diameter would be the diameterwhere the belt rests tightly against the v-notch but this will get you in the ballpark. You can tweak it from there by going one size up or down, depending on what is available.


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post #3 of 6 (permalink) Old 11-20-2009, 05:06 PM
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Timberwolf blades have a chart, does this help?

blade speeds

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post #4 of 6 (permalink) Old 11-24-2009, 10:12 AM Thread Starter
 
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Sorry, I did't make myself clear, I am trying to decide on the best blade speed, then I can figure out all that pully stuff. Thanks, Melvin
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post #5 of 6 (permalink) Old 11-24-2009, 10:15 AM Thread Starter
 
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Thanks Ronald that is pretty much exactly what I am looking for, Melvin
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post #6 of 6 (permalink) Old 11-24-2009, 06:26 PM
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hi melvin,

im glad Ron was able to give you a simple straightforward answer. its nice when you get such great help.

light travels faster than sound, this is why some people seem bright til you hear them speak.

Please Please Please edit your profile with a name and location so we can better assist you and make for a friendlier forum

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