I'm trying to work out the free body diagram for a router tool (which is basically used to cut wood sideways and create grooves and interesting shapes). I need to work out the free body diagram in order to find out the bearing load but I'm having difficulty with the aforesaid. The shaft that holds the cutting tool is spun by using an AC motor. So the torque is provided by the motor. My question is whether I should include the force that creates the torque. Since the shaft is spinning at a constant speed during the cutting process, there will be no torque and hence no force. The only external force is from the user having to push the tool and this I will include. So basically what I want to know is whether I should include the Torque created by the motor despite it moving at constant speed.