I am working on building a motorized tilting stage for a contact angle goniometer we use at my workplace. Ours is static and I am planning on copying this design as closely as possible as it is fairly simple and effective, I just need to build the tilting apparatus and mount our goniometer to it. My question is, what kind of motor is best suited for this task?
Ideally It needs to have as little jitter as possible for smooth rotation, and it needs to be able to rotate at about roughly anywhere from 1/2 rpm to ~1/12 rpm (fast for returning to level, slow for the measurement phase). I recognize that I will absolutely be needing some gearing (probably a worm gear setup) as it will allow me to have very smooth and slow rotation, but what style of motor would be consistent in speed, and ideally quiet? I plan on using an accelerometer to measure the stages angle in real time (I think this should work since its moving so slowly the motion shouldn’t affect the reading, but if it does I can also use a gyroscope to correct for that error).
After a lot of googling I only feel more confused. A stepper that is microstepped would be very smooth and controlled but apparently it seems like it would be harder to adjust on the fly based on the readings from the accelerometer? Because with a DC motor (IDK if brushed or brushless is more ideal here), I can just adjust the speed directly based on the angle readings. Idk, I feel very unsure about what the best option is and would love to have someone more knowledgeable assist me.
The other thing I’m thinking, is that by orienting the axis of rotation close to the center of mass of the setup, there will only be a small amount of torque on the motor to keep the gears in tension while not requiring a ton of torque from the motor.
Thank you so much for any assistance!