Jason,
Glad to help! In laymans terms, Detent torque is about 5-20% of Holding Torque! The motor by nature has to overcome such things as the bearings, couplings etc. to actually provide movement. So, the detent torque is that number (Holding torque= no friction and Detent=actually what is rendered to the work once the motor has to move). In some cases, you could have to overcome enough forces such as the cut your taking (to deep), or the item you want to move (to heavy) and the motor will not actually move because it can not overcome these forces. When making your estimates for motor size, it is best to use the Detent torque, since it figures in the loss of "Power or Torque" within the motor its self. Like I said, usually 5-20%. Again, if the motor is just holding a point in space, it does not have to overcome the friction of the bearing etc, so that number is higher (again by 5-20%).
As and Engineer, I make it a point to add a multiplyer of about 2 to 2-1/2 what I actually figure it will take to make a cut of move an object. My father used to tell me to "Double it and add 50%", which has never failed me (god rest his sole) in years. That equation also works when estimating jobs for costs.
I hope this helps.
Regards,
Glen  |