Abrasives products, such as sandpaper, has the harmful substance which migh affect the environment. Therefore, it is recommended to always wear a mask, and PM mask should also be used for high mesh sandpaper.
In addition, for products like copper, lead, carbon fiber and fiberglass, the dust from the sanding process can easily harm the skin, so be sure to wear rubber gloves and, if necessary, rubber protective clothing.
Sanding process dust fluttering, the use of water grinding will reduce a lot of dust, but also will pollute the water quality, it is recommended to use a special bucket, a kind of mesh a bucket.
Selection of sandpaper
Generally speaking, the sandpaper grits should start from the degree of surface finish until the expected degree of polishing.
Wood, leather and other fibrous materials, it is difficult to reach a very high grit, they can start directly from about 200 grit, and 800 to 1000 grit can be the end.
Higher mesh wood leather polishing, the original material needs to be tight, containing oil wax, at this time use smooth hard surfaces such as glass, hardwood, brass, etc., dipped in chemical filler, the fibers will be bonded, you can further polish
Metal materials, starting from about 80 grit, each time multiplied by 2, to 1500 or 2000 mesh when the effect is already good.
Higher mesh metal polishing, you can further use 3000, 5000 mesh sandpaper, but the effect is very little, at this time should use polishing paste, with a clean cloth, paper, etc. dipped in rubbing, or use wool wheel to deal with; In addition, there are also the use of chemical polishing agent, the effect can reach the mirror, but not conducive to personal health.
Plastic, carbon fiber, fiberglass, stone products, the general original surface has a matte effect, sandpaper selection is limited, 800 mesh, 1200 mesh, 1500 mesh, 2000 mesh, etc., higher mesh should use polishing paste.
If you are dealing with scratches, first of all, you should confirm whether the surface can be evenly thinned to the scratched depressions, otherwise it is not recommended to partially sand, which will produce a bumpy feeling, and you should apply polishing paste as a whole and polish with a wool wheel to lighten the traces.
Sanding technique (abrasives tips and sandpaper method)
First of all, start from low sanding grit, low mesh is not easy to block the sandpaper, and the powder is easy to collect, so you can not use water to sand. After each dry sanding, clean up the powder and confirm whether the sandpaper marks on the surface are even and straight, if the effect is satisfactory, you can switch to the next mesh, at which time the sanding direction should be at a large angle with the previous trace.
The biggest point is that after each water sanding, in addition to rinsing the sandpaper, clean the sand particles on the surface of the workpiece with a clean cloth or paper to ensure that there are no sand particles of low mesh to pollute the surface, and then switch to high mesh sandpaper. At this time it is still recommended that a mesh number a bucket, the daily work after the end of the stationary, reduce the pollution of the environment.
After the high mesh count reaches a certain level, such as 2000 or 5000 mesh, you should always observe the condition of blocking sandpaper. It is useless to sand after blocking sandpaper, but it may lead to local overheating bonding; once blocking sandpaper, you should carefully clean the sandpaper with water or oil.
The production and use of sanding blocks
Sanding blocks are made to match the surface of the workpiece. Generally speaking, when dealing with large flat surfaces, it is often worried about uneven hand sanding, so the block should have a flat surface and be able to hold or paste sandpaper. If you want to sand curves, the material of the sanding block should be able to bend, such as bamboo, sponge, etc.
There are industrial sanding blocks, the most common is the sanding strip for nails, there are also some diamond sanding blocks, which can be used instead of sandpaper, with strong cutting power and durability.
Another situation is shaped sanding block, such as leather chipping edge sanding, you need U-groove sanding block, the production should consider the convenience of replacing sandpaper, laminate processing + bolt fixing is a good choice.
The sanding block should be chamfered, even so, the sandpaper at the edge may still peel off during use, and the peeled area should be trimmed immediately to prevent the sandpaper from overlapping and destroying the workpiece.
Summary
Sandpaper sanding can be used with sanding blocks for fast and reliable processing of large surfaces, as well as for hand polishing of curves and bumps.