Advantages and disadvantages of automatic sand blasting and manual sand blasting

Automatic: 1. The metal part of the automatic sandblasting machine is basically not damaged, and the dimensional accuracy will not change; 2. The surface of the part is not polluted, and the abrasive will not react chemically with the material of the part; 3. The automatic sandblasting machine can easily handle the hard-to-reach parts such as grooves and depressions, and can choose abrasives of various sizes to use; 4. The treatment cost is greatly reduced, which is mainly reflected in improving the working efficiency of the automatic sandblasting machine and meeting various requirements of surface finishing; Automatic sandblasting machine can be used as corrosion layer of metal, heat treatment of residual salt and oxide layer on the surface of parts, oxide layer on the surface of rolled parts, forged parts and welded parts, molding sand and oxide layer on the surface of castings, residual dirt and tiny burrs on the surface of machined parts, surface treatment of old machine parts, removal of surface adhesion layer, and exposure of matrix color. Automatic sandblasting machine can change the stress state of the workpiece surface, improve the lubrication condition of the matching parts, reduce the noise when the parts move, harden the workpiece surface and improve the wear resistance and fatigue strength of the parts. 5. Automatic sandblasting machine is used to polish the surface of workpiece. The automatic sandblasting machine can change the roughness Ra value of the workpiece surface, produce a matte or diffuse reflection workpiece surface, and achieve the purpose of polishing. Manual: I don't understand what the hell is manual sandblasting? Can I use my hand instead of the spraying device of the sandblasting machine?