What specific impacts do the circular base materials of different hardness of Velcro have on the flatness of sandpaper adhesion and the precision of grinding?

The influence on flatness
Moderate hardness: A magic tape disc base material that's moderately hard can stick to the sandpaper better. It can reduce problems like poor adhesion, wrinkling, or air bubbles caused by a base material that's too hard or too soft. This kind of base material makes sure the sandpaper stays flat during grinding, so it improves the grinding effect.
Too hard base material: If the base material of the magic tape disc is too hard, it might not be able to adapt well to the tiny deformations of the sandpaper. That can cause the sandpaper to lift up in some places or be uneven when it's stuck. This not only affects how evenly the grinding is done but also makes the sandpaper more likely to get damaged.
Too soft base material: On the contrary, if the base material is too soft, it might not give enough support to the sandpaper. That can make the sandpaper collapse or deform during grinding. This also affects how flat the grinding is and might even make the grinding accuracy go down.
The influence on grinding accuracy
Accuracy control: A base material that's moderately hard can control the grinding accuracy of the sandpaper better. During the grinding process, it can make sure the sandpaper touches the surface of the workpiece with a stable pressure and speed. That way, you can get a more precise grinding result.
Disadvantages of too hard or too soft base materials: A base material that's too hard might cause the contact pressure between the sandpaper and the workpiece surface to be uneven. That affects the accuracy and consistency of the grinding. And a base material that's too soft might not give enough support. That can make the sandpaper shake or move around during grinding, and that affects the grinding accuracy.
Choosing a magic tape disc base material that's moderately hard is really important for making sure the sandpaper sticks flat and the grinding is accurate. In real use, you should pick the right hardness of the base material based on the specific grinding needs and the material of the workpiece.