I have a question on the speeds for shaper 55-2421

On the spindle shaper main page speed is listed as 3,500-7,000 rpm
http://wood.baileighindustrial.com/w...pindle-shapers

On the shaper 55-2421 page under the description tab it list speed as 5,300-8,300
http://wood.baileighindustrial.com/wood-shaper-ss-2421

Under the Specifications tab it list speed as 7,000-10,000 rpm.