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Forum topic by Sawdust2 posted 956 days ago 3051 views 0 times favorited 8 replies Add to Favorites Watch
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Sawdust2

1467 posts in 2720 days


956 days ago

Topic tags/keywords: question bandsaw

The motor on my bandsaw gave up all its smoke the other day.
It was a 1725 rpm with a 2.5” pulley on the drive shaft and a 6” pulley on the bandsaw axle.
I got a really good deal on a new motor but it is 3450 rpm
Unless I modify the safety cover the largest pulley I can put on the bandsaw is 7”
The smallest pulley I can find is 2” which means I would need about a 10” pulley for the saw. That would also interfere with the dust port.

Do they make a 1.5” x 1/2 pulley?

If I put the 2” pulley and a 7” pulley my blade speed with be about 8-900 ipm as opposed to the current 660.

Can I run it safely at that speed?

Is it just better to return the motor and get the slower speed motor that is about 2x as expensive?
(I have to admit that I neglected to check the motor speed when I saw the price.)

Lee

-- No piece is cut too short. It was meant for a smaller project.


8 replies so far

View kizerpea's profile

kizerpea

746 posts in 999 days


#1 posted 956 days ago

yep they do. check (granger)

-- IF YOUR NOT MAKING DUST...YOU ARE COLLECTING IT! SOUTH CAROLINA.

View BobM001's profile

BobM001

388 posts in 962 days


#2 posted 955 days ago

I have read that at times especially when resawing with a 3/4” or larger blade you want the blade feet/minute to be LESS. This gives the blade a chance to cool. Your original set up had a “calculated” wheel RPM of 718.75. The 1.5/7 combination with a 3450 motor will give you 739.28 RPM on the wheels. I think that you will be better off with a 1725 motor. It has more torque because of its 4 pole design.

Bob

-- OK, who's the wise guy that shrunk the plywood?

View Karson's profile

Karson

34870 posts in 3033 days


#3 posted 955 days ago

I picked up this post on the web.

“I need a formula to calculate the the blade speed on my band saw (fpm or sfpm?) I have a 3450 rpm motor with a 2” pulley connected to a 7.5” driven pulley that turns a 14” band saw wheel. I need to slow the speed on this saw and the formula would help me know what size pulley to go with. Any help would much appreciated.
Thanks in advance”

dacoach1428
YOUR SPEED IS 3,372 FPM

Lee: Here is a link on bandsaw blades and suggested blade speed.

-- I've been blessed with a father who liked to tinker in wood, and a wife who lets me tinker in wood. Southern Delaware karson_morrison@bigfoot.com †

View tenontim's profile

tenontim

2131 posts in 2376 days


#4 posted 955 days ago

Lee, check Grizzly’s site. They have 1 hp, 1750rpm motors for $139, which ain’t bad.

View Karson's profile

Karson

34870 posts in 3033 days


#5 posted 955 days ago

And here is the formula for blade speed

-- I've been blessed with a father who liked to tinker in wood, and a wife who lets me tinker in wood. Southern Delaware karson_morrison@bigfoot.com †

View Sawdust2's profile

Sawdust2

1467 posts in 2720 days


#6 posted 955 days ago

Jet recommends a speed of 3000 SFPM.

I got a great deal on a 5hp motor. Out the door with a 3 year warranty for $200.00.

The motor is the same physical size as the 1 HP motor and a friend of mine has already done this on his Jet.

A 1.5: drive pulley and a 7” base pulley should work OK.

Thanks for the formula.

-- No piece is cut too short. It was meant for a smaller project.

View Sawdust2's profile

Sawdust2

1467 posts in 2720 days


#7 posted 950 days ago

The stars aligned tonight.
I ended up using a 1.5” drive pulley and a 7” saw pulley with the 3450 5hp motor.
I did not do the math because the piulleys added up the same so it has to be close.

Cut the same piece of walnut with the same blade with the new motor.

The cut was a lot smoother.

I’ve got 2 M K Morse blades on order that should be here next week.

I don’t ‘spect I’ll lose any smoke with this motor.

-- No piece is cut too short. It was meant for a smaller project.

View Karson's profile

Karson

34870 posts in 3033 days


#8 posted 950 days ago

Not having as smoke generator in your shop is a good thing.

-- I've been blessed with a father who liked to tinker in wood, and a wife who lets me tinker in wood. Southern Delaware karson_morrison@bigfoot.com †

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