a smaller blade on the arbor will be too slow
Isn't it the other way around? The larger the blade the slower the
speed of the outside edge, smaller blade outside edge turns
If the shaft on which the blade is mounted is turning at the same
speed, the larger diameter blade will have the fastest speed at it’s
For sake of description assume a blade with a 10 inch diameter
turning at 100 rpm
10 x pi = 31.4 The circumference is 31.4 inches
31.4 x 100 = 3141 inches per minute speed at the outer edge of the
Now let’s use a 20 inch diameter blade turning at 100 rpm.
20 x pi = 62.8 The circumference is 62.8 inches.
62.8 x 100 = 6280 inches per minute speed at the outside edge of the
The larger blade in this case is twice as fast as the smaller blade.