1. The development of the prototype process route can be divided into two processing steps according to the needs of the workpiece. 

First, process the appearance and inner wall of the hand board, mill the benchmark, then flip it 180 degrees to clamp it, and process the outer surface and button screen position. 

If the outer surface is processed first and then the inner wall is processed, it will be difficult to locate and clamp for secondary processing.

2.If the wall thickness of the hand board is only 1.5mm, it is prone to deformation and breakage when processing the outer surface. 

If any filling material is added to the processed cavity for support. 

This can avoid processing the through-hole area and then filling it with gypsum, otherwise it is difficult to separate the finished product and the filling material.

3.The trimmed surface should be repaired first, covering the position of the surface through hole, and then machining on the front side. 

Then, groove excavation should be carried out to complete the through hole machining, in order to avoid uneven tool path and cutting force when machining to the through hole position.

4. The various parts on the hand board should have sufficient strength and stiffness to prevent damage and deformation during use. 

The various parts on the hand board should have sufficient strength and stiffness to prevent damage and deformation during use. The fastening parts should have anti loosening measures to avoid accidental injury to the operator. 

It is not allowed to have waste or workpiece missiles during the processing, which may affect the operator’s attention or even injure the operator. Additionally, it is important to avoid cutting hands with burrs on the punched parts.