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New Way Air Bearings https://www.newwayairbearings.com/

https://www.digikey.com/en/product-highlight/s/schurter/aso-series-high-performance-fuses

How about it's a question who's answer can be marker wrong no matter what you answer so they can low ball you on the salary offer.

Just an opinion. If a hot wire shorts to the armor (say a nail is driven thru the cable)and the armor is not grounded, you have a Hot armor.

I agree with all that cswilson says but I'd suggest using a Slotless Brushless Motor with No shaft Seals. Current = Torque. https://www.machinedesign.com/technologies/slotless-motors-smooth-way

UHMWPE https://en.wikipedia.org/wiki/Ultra-high-molecular-weight_polyethylene

Hypalon https://en.wikipedia.org/wiki/Hypalon

For the rotary motion-step motor let me suggest Harmonic Drive. http://www.harmonicdrive.net/

For a step motor-Linear Actuator let me suggest Lin Engineering. https://www.linengineering.com/

Mathematically if you input a 1 volt, 1 radian/sec sine wave to the plant input (Vin) and measure the plant output voltage (Vout) (Again a sine wave at 1 radian/sec with an amplitude A) the plant gain is Gain = Vout/Vin = A/1 = A

There is probably a difference between the simulation and the real plant Gain. An Integrating Plant has an Integral Gain which is the plant gain at one radian per second.

https://www.mcmaster.com/garolite-plastic

Let me suggest that the noise could be from an external source on the AC Power. Try a line filter.

If the third outer "Ring" is the transmission Aluminum case the problem might be looked at differently. 1) Interference between a beqring race and the steel ring it's mounted in is well established. 2) When hot the steel ring must not get loose in the Aluminum. 3) When cold the aluminum must...

At some point it's time for FEA.

Vanta Black Spray Paint https://www.surreynanosystems.com/super-black-coatings/vantablack-s-vis

Velvet Flock, Adhesive Backed...

The sprags are sliping. See Spragform. https://www.formsprag.com/products/General-Purpose-Clutches/Ball-Bearing-Supported

Commonly called "Rod Ends." They come in a range of qualities. http://www.aurorabearing.com/index.html

Skogsgurra, From "Thrust" in Wikipedia; 1) A rocket is propelled forward by a thrust force equal in magnitude, but opposite in direction, to the time-rate of momentum change of the exhaust gas accelerated from the combustion chamber through the rocket engine nozzle. This is the exhaust...