Why do so many many mechanical things that are made to stick together often fail?
It is all in the application, mechanical fasteners (screw, nuts, and bolts) are meant to hold things in place but also allow removal. Glue is for a permanent bond that is not meant to be removed. I have seen both fail. Fasteners usually fail from under or over tightening or using the wrong type. If you are constantly loosening and tightening a screw, especially into wood, the threads will eventually just make drill a hole. If bolts and nuts are always coming loose then you may need to use a lock washer or torque the bolt tighter. If bolt or screw is breaking off you may need to lessen the torque or use a larger bolt or screw. Glue usually fails due to temperature or application, some glues don’t work very well in certain climates (cold, hot, humid) also many times they will not stick to certain surface. Glues usually have detailed instruction on how to use for best results, most have a setup time, or time until the glue hardens, and a maximum and minimum temperature that the glue can b
