Band saw Speed (wheel size)

[Gerbrand Nel]

I got my hands on an old band saw without a motor, and I also happen to have an old bench grinder that I want to use to drive the band saw. I went to the local engineering shop hoping they would know what wheel sizes to make to get the speed on the band saw right. They had a hard time figuring it out, so I was hoping someone here would know how to go about it. The wheel on the band saw that the blade runs on is 26cm in diameter, and the motor runs at 3000 rpm. Now I would like the blade to run at a speed of about 70fps or 2134cm/s. How do I calculate the sizes of the pulley wheels on the motor and the saw to get the right speed on the blade?

Thanks

Gerbrand

[john marcus]

I got my hands on an old band saw without a motor, and I also happen to have an old bench grinder that I want to use to drive the band saw. I went to the local engineering shop hoping they would know what wheel sizes to make to get the speed on the band saw right. They had a hard time figuring it out, so I was hoping someone here would know how to go about it. The wheel on the band saw that the blade runs on is 26cm in diameter, and the motor runs at 3000 rpm. Now I would like the blade to run at a speed of about 70fps or 2134cm/s. How do I calculate the sizes of the pulley wheels on the motor and the saw to get the right speed on the blade?

Thanks

Gerbrand

 

 

i assume you meant a blade speed of 70 feet per minute ???? in which case a reduction from 3000 rpm must be very large

 

the circumference of the band wheel is about 32 inches

 

70 fpm is 840 inches per min

 

840/32 is 26 rpm for the band wheel

 

 

or a speed reduction of 3000/26 or 114 not easy to do with a single belt reduction

Edited May 6, 2009 by john marcus

[Ken Kelley]

Here's a handy dandy pulley and belt speed calculator. Plug in you numbers and out pops the speeds. You can switch the variables around to get where you want to go.

 

http://www.csgnetwork.com/pulleybeltcalc.html

[Matt Bower]

Just to clarify, is this a metal- or a wood-cutting band saw? 4200 sfpm (70 feet per second) would be reasonable for wood (maybe a little fast, but not completely out of the ballpark), but it's way too fast for metal -- by a factor of more than ten

Edited May 6, 2009 by Matt Bower

[Gerbrand Nel]

Just to clarify, is this a metal- or a wood-cutting band saw? 4200 sfpm (70 feet per second) would be reasonable for wood (maybe a little fast, but not completely out of the ballpark), but it's way too fast for metal -- by a factor of more than ten

Wow. I thought under 100fps is good for stainless with 30fps being the sweet spot. Thats why I'm aiming for 70

You sure about this?

Thanx for the replies everyone

G

[Willman]

Some quick numbers,

 

wood 2,700fpm

bronze 80fpm

4130 steel 270fpm

1020 steel 330fpm

[Gerbrand Nel]

looks like I got fps and fpm mixed up.. back to the drawing bord

[john marcus]

looks like I got fps and fpm mixed up.. back to the drawing bord

 

 

 

my speed table shows SS between 50 - 150 fpm