I'm trying to determine how powerful of a stepper motor I need for a project. I am attempting to take a display that weighs 15lbs and transition it from laying flat to inclined (approximately 45 degrees) using a stepper motor. I had considered a linear actuator since it would have been an easier build but clearance under the display is an issue and I have more room horizontally. I haven't done the exact measurements for the lifting arm as I'm not sure if a gear reduction will be needed yet but for example purpose I was thinking of a 5in moment arm from the center of the motor. Even though the display will pivot at the bottom and be supported I figured that when laying flat the motor still has to have enough force to lift the full 15lbs at the 5in displacement for a moment of 75lb-in. Motors I have looked at talk of a "holding torque" value as what describes them. Did a little research on holding torque but still not 100% understanding the term. These values, for most ideal sized motors, rarely exceeds 250 oz-in or about 15.5lb-in. Am I right in needing to optimize "holding torque" > moment? In which case if I want to utilize the 15.5lb-in motor I would then need to perform at least a 1:5 gear reduction in order to boost my torque to 77.5lb-in to accommodate the max moment? Thanks for any input.