Pulley sizes on bandsaws

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Forum topic by parkerdog posted 07-13-2013 11:29 PM 1081 views 0 times favorited 1 reply Add to Favorites Watch
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24 posts in 1856 days

07-13-2013 11:29 PM

Topic tags/keywords: pulley size bandsaw

Last night during the bearing change on the arbor I broke my wheel pulley.

So, since the pulley on my motor was original and a step pulley I was going to turn around to use for 2 3/4 diameter I figured I might as well replace both.

I tried doing some research on physics and the math of pulleys but that was giving me a headache so I figured maybe someone with more upstairs than me could just tell me?

I was going to use the pulley already on the motor, just turn it around so it would line up making my saw a single speed instead of a four speed. It was going to be 2.75 on the motor and 6 inch on the wheel to give me a 2819 sfpm.

I broke the 6 inch so I’ve been looking at other options. My question is does it matter if say I go with 2 inch on the motor and a 4 inch on the wheel? I know my speed will increase a little but I was wondering if it affected the abilities of the saw power wise?

Is it better to use a bigger wheel on the motor or wheel? Keeping both in ratio to retain the desired speed of the blade of course.

I know it was said that delta used a 2 3/4 and a 6, I am just wondering if there is an advantage to using other sizes since I’m going to replace both. And grizzly has some balanced cast iron in the sizes I was wondering about.


1 reply so far

View MrUnix's profile


6706 posts in 2196 days

#1 posted 07-14-2013 12:06 AM

You can use any combination of sizes you like as long as the resulting speed remains in the usable range.. however, you don’t want to go too small on the motor pulley.. v-belts do not like sharp angles. The original Delta used a 2.75” motor pulley and an 8” drive pulley, and later changed to a 6”.

You can play around with different sizes and resulting speeds here.


-- Brad in FL - In Dog I trust... everything else is questionable

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