Direct or geared reduction to threaded drive ? (stepper)
I've been trying to work out if there are distinct benefits on having either a geared reduction between stepper motor and threaded drive vs a direct drive arrangement (let it be either acme or ball screw so friction doesn't distract the argument)
My reckoning is that optimal mechanical advantage can all be managed through combined choice of thread pitch and size of motor. Basically I have concluded that gearing a stepper to the threaded rod achieves nothing of tangible value.
I can see an argument that reducing the risk of whipping could justify having a geared reduction therefore enabling the screw to have fewer turns per inch but couldn't you achieve the same just by having a more powerful motor?
I can also see an argument that having a geared arrangement using pulleys and belt overcomes coupling alignment issues but that is surely an argument of convenience rather than mechanical advantage.
I appreciate that I might be over simplifying things and making some gross assumptions but what are other people's opinions on this subject?
Andy
Drat, imperfection has finally stopped working!!