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The sand belt is a bendable grinding tool.
It consists of:
The support (support material)
The support is coated with glue which takes up the abrasive grains. Is has a high stability and bendability in order to resist the strains during the grinding process.
Binding agent (glue)
The binding agent serves to stick the abrasive to the support.
The abrasives
The abrasives are shaped edged, mineral or synthetic abrasive tools of different size and hardness. The abrasive carries out the cutting process. There are abrasives of different type and grain size.
According to the grain size different grain groups are distinguished.
The maximum size of the abrasive grains is indicated in 1/100 mm.
|
grain group |
indication of the graining |
|
fine |
16 |
| |
20 |
| |
25 |
|
medium |
32 |
| |
40 |
| |
50 |
|
coarse |
80 |
| |
100 |
| |
125 |
The sand belt is roller ware with a roller width of 120 mm to 200 mm. It is cut to the necessary length and fixed together as a transverse or tooth shaped joint. The joint will be sticked on the back with solid thin cloth.
Figure 2 - Sand belt joining
1 transverse glued joint
2 tooth shaped joint
The sand belt should be stored dry. The belts should not be bent or teared on the edges.
The abrasive type and the graining are printed on the sand belt, e.g. NK 32, NK = normal corundum, 32 = medium grain group.
The sand belt must be covered at the belt rollers and at the front edge of the upper belt run.
What does the sand belt consist
of?
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What types of abrasives are there to be
found?
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How is the sand belt fixed to an endless
belt?
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