What do you need to pay attention to when Mai sandpaper?

Pay attention to the number of meshes, but also pay attention to the thickness of the sand, generally 240 to 320 meshes, if the sandpaper is too thick, it will make sand marks (sand marks) If the sandpaper is too fine, it will not be able to polish, and it is difficult to polish.

The commonly used ones are 400

For example, W10 stands for No. 04 sandpaper, 800 mesh. The comparison of the specifications of other types of sandpaper is shown in the following figure:

According to different grinding substances, there are many kinds of emery paper, artificial emery paper, glass sandpaper, etc. Dry sandpaper (wood sandpaper) is used to polish the surface of wood and bamboo. Water-resistant sandpaper (water sandpaper) is used to polish the surface of metallic or non-metallic workpieces in water or oil.

Sandpaper and other models, the number represents the particle size, and the particle size refers to the number of particles in the area of 1 inch * 1 inch.

The specifications of other types of sandpaper are compared as follows:

What will it look like after sanding?

The higher the mesh. The smoother the sanding. But it's also slow. Generally from 200to 800 to 100 to 1200 If you want to be more delicate and smooth, you have to use metallographic sandpaper.

The larger the abrasive cloth number, the finer the abrasive cloth, and the general one is sanded first, and then sanded with a water abrasive cloth.

The larger and finer the size, the slower the polishing.

There is no strict restriction on the sandpaper used for grinding table tennis rackets, and there is no unified standard for the thickness of the sandpaper. According to the characteristics of sandpaper and the requirements for the purpose of grinding table tennis rackets, the following points should be paid attention to when grinding table tennis rackets and selecting sandpaper:

1.In terms of use, sandpaper can be divided into dry sandpaper and water sandpaper, and dry sandpaper should be used to grind table tennis rackets.

2.According to the size of the sandpaper, sandpaper is divided into different labels, which are marked with "eye" or "number". The lower the mark, the larger the sandpaper sand particles and the greater the friction strength; The higher the grade, the smaller the sandpaper sand and the better the polishing effect. To grind a table tennis racket, choose 80 150 mesh sandpaper.

3.There are generally two purposes of grinding table tennis rackets: one is to polish off a small part of the edge of the racket grip according to personal grip habits, so as to make the grip more comfortable; The second is to polish off the edges and corners of the racket grip to make it smooth and not grinding.

If the former is to be sanded with sandpaper with a slightly lower mark, that is, slightly coarser sandpaper (such as about 80 mesh), and then sanded with fine sandpaper (such as 100 150 mesh); The latter is sanded with 100 150 grit sandpaper.

4.When grinding, pay attention to keep the racket polishing place dry and not wet.

Polishing the average size of honey.

Copying wax, about 10 grams.

Left and right, one piece of sandpaper per eye is enough. You need to prepare 80 240 600 1000 1500 2000 3000 5000 7000 mesh sandpaper, it is best to buy which ***, because beeswax polishing is generally dipped in water to polish the most aspect, and the general sandpaper is easy to fall off the sand bubbles. After 7000 mesh polishing, polish it with toothpaste.

If you polish for a long time, buy a few more sheets at a time for the low mesh number, because the low mesh is quick to use, and the high mesh one can be used for a long time.

May I ask this kind of sandpaper to buy in **?

First of all: the cleaning of the glass surface and the preparation of the glass before polishing.

1.First, wrap the edge of the glass to be repaired with tape.

2.There must not be any dust, sand, etc. attached. Carefully clean the exterior of the glass and the glass polishing sandpaper.

3.First, use a marker pen to circle the part to be polished and repaired in front of the glass, before the glass is polished. Prevent the polishing area from being too large due to slippage.

Then use P120, P240, P400, P600 glass sandpaper to eliminate glass scratches; Note that the sandpaper model here is different from the daily hand-thrown sandpaper model marking, and cannot be mixed with daily sandpaper. Dilute with water and pour out a little of the polishing stock solution as needed. No more than 15 dedicated to sandpaper polishing use.

At no time can sandpaper be dry ground directly on the surface of the glass. The scratch polishing place must ensure that the polishing liquid is sufficient. Make the surface meet the final polishing requirements, aDeep scratches (obvious to the touch) :p 120 glass sandpaper for initial grinding, then use P240 to polish and flat, and then polish with P600 sandpaper again to make the surface meet the final polishing requirements, bSlight scratches (no feeling to the hand but white marks): the glass sandpaper is first polished, and the sandpaper is polished again. Although it can also be polished and removed, this operation is also applicable to various scratch polishing precautions on the surface of various glass surfaces in daily life: scratches with a depth of more than 100 microns. However, after polishing, it will affect the safety performance of the glass, especially the front windshield of the car is not suitable for polishing with deep scratches of more than 100 microns.

The short summary is:

First use sandpaper wet grinding to gradually remove marks, and then use polishing tablets and polishing liquid to polish translucent Replace the polishing stock solution and use a special polishing wheel to polish and reduce the glass translucent Coated with the polishing stock solution and use a special polishing wheel (use appropriate pressure to wipe the glass clean and observe the sandpaper grinding range. The polishing machine tray should be level with the glass surface) polishing. If there is no polishing machine, you can use manual polishing disc polishing, pay attention to the moving speed at this time should not be too fast, and polish carefully to ensure the effect.

Finally, repeat the above method if the gloss is not good.

Polishing the glass? You're full.

It's simply not possible, even if it may cost much more than buying again.

Disagree with the statement upstairs.

Many of the TV screens are also injured before leaving the factory, most of them are fixed on the machine with a large polishing wheel, so that the surface can be polished with polishing powder and water.

Agree with what was said upstairs.

I can give you a suggestion though. You might as well use sandpaper to make the glass frosted glass. If the craftsmanship is good, it may be able to be ground into handicrafts.

In order to make up for these shortcomings, grinding and polishing are usually carried out after spraying to improve the mirror effect of the paint film and achieve the requirements of brightness, smoothness and showiness. The steps for grinding and polishing are as follows:

1. Clean the whole vehicle. Clean the whole vehicle with a paint cleaner with strong detergency, and when using the cleaning agent, you should avoid new scratches caused by particle dust in the grinding.

2. Water sandpaper grinding. For defects such as coarse grains, fine sandpaper marks, flow marks and other defects on the painted surface, wrap 600 water sandpaper in water in a small rubber liner before polishing, and gently polish it until it is smooth (note that it cannot be worn through the paint layer).

3. Coarse and fine grinding. Use a mechanical grinder (electric or pneumatic) plus coarse abrasive paste to coarsely grind the traces of water sandpaper; Then add abrasive paste to polish and polish fine grinding.

4. Polishing. A mechanical polishing machine is used to remove the spin marks left by the coarse abrasive paste with a mirror treatment agent to achieve the effect of mirror polishing of the paint film.

5. Hand glazing. After grinding and polishing, wipe off the grinding and polishing paste, immediately wipe all the polished parts with cotton yarn dipped in varnish wax, and then wipe off the excess varnish wax with dry cotton yarn to make the paint surface bright and dazzling.

It is best to find a professional to polish If you want to polish it yourself, it is best to grind gently with 2000 sandpaper, and then wipe it clean to see if there are any scratches, if not, remember to clean the polishing head.