Part1.

1. Sand off burrs, floating rust, oil and dust on the surface of the substrate;

2, reduce the roughness of the workpiece painted surface, such as after the surface of the putty is dried, the general surface is rough and uneven, and it is necessary to obtain a smooth surface by grinding;

3, enhance the adhesion of the coating. Poor adhesion of the coating on smooth surfaces can enhance the mechanical adhesion of the coating after grinding.

Part2.

1, reasonable selection of different thickness : a. should not be too thick, should not use too much of a model; b. Should not jump sand (refers to the type of sandpaper), from 200# to 600# or 800#.

2, grinding along the wood grain grinding, never vertical and horizontal grinding, otherwise it will make the wood grain crack, painted furniture will leave permanent flaws.

3, where the corner and corner of the polished object can not sand collapse, the action should be light, and the original circular or square outline must be maintained. Decorative line must be kept straight, can not make it bend, break, deformation.

4. When sanding, it is generally held with four fingers and palm, and the thumb holds the sandpaper. When polishing the furniture with a larger area, square wood strips can be polished along the wood grain.

5, grinding edge brush, because the sand of the sandpaper is easy to fall off, there is the possibility of grinding broken wood grain after brushing the surface. In addition, the dust and ash that are polished down are easy to embed in the temples, so it is necessary to brush the dust and ash with a dry brush at any time when sanding, grinding and brushing until the surface is smooth and smooth.

6, the board parts have local bumps and scratches, should first use hot water and iron, after heating, try to restore the original plane after sand. Such as using the thumb, index finger and middle thumb to press the sandpaper, only limited to the sand local, not suitable for large area of sand workpiece, otherwise the overall plane sand into uneven, and so on after painting can see the concave phenomenon.

7, the outer arc and the inner bow plate, in the grinding must use the template (and the plate shape of the same template, the sandpaper on the template grinding), such as the use of electric or pneumatic small sander, the machine should be polished along the shape of the plate, to prevent sand into a step.

Part3.

1, dry grinding:

2, wet grinding:

3, mechanical grinding:

4, light grinding:

Part4.

(1) Solid wood white: 180# - 240# sandpaper is used for polishing

(2) Splint or a grinding: choose 220# - 240# sandpaper

(3) Smooth primer polishing: use 320# - 400# sandpaper

(4) The last primer or polishing: choose 600# - 800# sandpaper

(5) Finish polishing: 1500# - 2000# sandpaper

(1) Reasons

(2) Solutions