I have a few comments.
First of all, I definitely don't like the use of chipboard as a material for both the housing of the device and the turntable. The casing does not give off heat, and in my opinion, the turntable will develop a hole in the shaft over time and the drive will have a lot of runout. You don't write anything about the ramp, that is, the slow acceleration of the engine. Without it, your mounting, due to high overloads caused by engine acceleration, will loosen the (single-point) mounting of this plate over time, and no super glues will probably help here. In my opinion, it is also fatal to mount the engine itself. One time it is attached to the chipboard, and secondly, it is attached to the bottom while the rotating disc is at the top of the engine. It is asking you to use a motor with a flange mounting so that the rotating element is as close to this mounting as possible. Then the arm of the centrifugal force of the rotating plate on the motor mount is shortened. And one more thing - do you know what temperature resistance class is the motor winding currently in? I am asking because I do not know if the thermal protection of this motor is adequate for this class. And since I'm still at the engine, I will refer to the following remark from one of my colleagues:
A commutator motor would be cheaper
Could you write about exactly what type of engine do you mean? Because as far as I know, these engines have a very high rotational speed, in the order of several thousand revolutions and a tendency to diverge. In an extreme situation, that is when the control fails, which is not a problem in such a housing, and if the device works in idle mode (without a container with metal needles), as a result of the rotating system reaching very high rotations, this disc could break and with it also the housing of the device. Normally, in such an engine, any rotating parts that could burst are located inside the metal housing of the engine. There is only a pulley on the outside that can handle much more rotations.
Regarding the inverter, I think it should have more space around it for ventilation, and it should rather be shielded.
Another thing is the ventilation grille. If it is assumed that temperatures in excess of 80 ° C can develop in the equipment:
If for some reason (despite the fans running) the motor reaches 85 °
then, PVC ventilation grilles should not be used, which can operate at a maximum temperature of 70 ° C: https://www.iwentylatory.pl/kratka-wentylacyj...zem-i-plastikowa-siatka-o-160-mm-biala-x13211
The polisher was also supposed to be simple at first, and a beautiful, almost factory-made product came out.
Yes, assuming it is only about the external appearance of the device. For me, the beauty of factory devices lies not only in the aesthetically finished housing, but also in the technical solutions used.
Forgive me, but based on my superficial observations about this project and what you wrote below:
I don't know anything about it. When a colleague asked if I would build it, I had no idea about the existence of such devices. I do not have a comparison with any other polisher, so I do not know what their advantages and disadvantages are.
I just designed and built what they asked me for.
I only feel sorry for the buyer of this device.