Table Saw Pulley Ratios?

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Forum topic by DirtyMike posted 09-10-2016 12:38 AM 198 views 0 times favorited 4 replies Add to Favorites Watch
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384 posts in 324 days

09-10-2016 12:38 AM

Hello all, MY 1750 rpm 1.75 hp motor on my old Taiwanese saw is gutless and needs replaced. I will be replacing it with a 3hp 3600rpm from harbor freight. changing the motor pulley will be the easiest, I really dont want to touch the arbor pulley if i dont have to. If anyone has went from a 1750 rpm to 3600 please comment. And yes my saw can handle 3 hp, I went through it completely when I first bought it. my current motor pulley is 2.75 inches O.D. and my arbor pulley looks to be 2.0 O.D.

4 replies so far

View MrUnix's profile


4032 posts in 1621 days

#1 posted 09-10-2016 12:55 AM

If your existing motor is 1750 rpm and the pulley diameters you give are correct, then the arbor is only spinning at around 2300 rpm, which is really slow. Most 10” table saws run the blade around 4000-5000 rpm. If you put in a 3450 rpm motor and use the same pulley arrangement, it would get you around 4700 rpm. If you want to maintain the speed you currently have at the arbor, you would either need to reduce the motor pulley to half it’s current size (1.375”, which isn’t really feasible) or double the size of the arbor pulley.

Arbor speed calculator can be found here.


-- Brad in FL - To be old and wise, you must first be young and stupid

View DirtyMike's profile


384 posts in 324 days

#2 posted 09-10-2016 12:57 AM

Am i correct that a 3600 rpm motor with a 1:1 ratio with spin my blade 3600 rpms? will i notice much torque loss with a 1:1?

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384 posts in 324 days

#3 posted 09-10-2016 01:37 AM

Thanks brad. My arbor pulley is 2.25 inches and the motor pulley is 2.75 inches. Low blade rpm explains a lot of the trouble I have been experiencing.

View Rick M.'s profile

Rick M.

7716 posts in 1802 days

#4 posted 09-10-2016 03:26 AM

Be careful of online pulley calculators. I tested a bunch a few years ago and some of them are inaccurate which is weird because the math is very simple.


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