Common sense is the same as general mechanical design, such as structure, mechanics, hydraulics, pneumatics, electromagnetism, electricity, electronics and so on.

Since it is non-standard, it means that the whole is not standardized;

However, in order to carry out the design work smoothly, a large number of standard structures, such as screws and bearings, still need to be adopted.

Even if the standard structure can't be used, we should try to modify the standard components (for example, common hardware, etc. ), so the efficiency is high, and the designed things are beautiful and practical;

The above views are for reference only.