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Only with perfect and sharp saws you can cut quickly, easily and precisely. Blunt saws make the job more difficult and cause a bad cutting quality.
The sharpening of saws is to be divided into the following steps:
- fasten the saw blade in the clamping device (hand vice)
- check the tooth top line and, if necessary, adjust it
- thereafter file out ground teeth
- set the teeth, i.e. the teeth are bent alternately
- sharpen the saw (file the teeth)
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First set the teeth and then file! |
Sequence of operations
- Check the tooth top line; examine the tooth top line for straightness or standing out tooth points.
Figure 15 Unequal tooth points
- If there are standing out tooth points adjust them with a flat file.
Figure 16 Adjusting the tooth points
1 flat file
- When adjusting smaller teeth file out with a three-square file.
Figure 17 Filing out the tooth spaces
- Setting of the teeth
With an alternately lateral bending of the saw teeth out of the tooth top line a free cutting action of the saw is achieved.
Saws can be set with
· a saw set or
· a saw set plier.
With a saw set you set by bending off the upper part of the tooth.
Figure 18 Saw set
1 saw blade, 2 saw set, 3 bent saw teeth, 4 saw tooth length
With a saw set plier saws are set more uniformly. The width of set can be adjusted with an adjusting screw on the plier.
Figure 19 Saw set plier
1 saw blade, 2 stationary lever of the plier, 3 movable lever which bends the saw tooth to the desired set width
What tools are saws set with before being
filed?
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- Sharpening of the saw (filing of the teeth)
· Select a three-square file with a cross-section that is equal to the form of the tooth space.· Guide the file at right angles to the saw blade and file the tooth face and the tooth back at the same time.
· Sharpen all teeth with the same number of file strokes.. Badly filed teeth are sharpened again with a few file strokes.
Figure 20 Cross-section of a file
1 correct cross-section, 2 wrong cross-section
Why must the file always fill out the whole tooth
space?
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Files must have a tight-fitting handle in order to avoid injuries. Sticking dirt has to be removed with a solvent from the file. |
What mistakes have been made with this useless and badly filed saw?
Figure 21 Badly filed saw teeth
1 correct tooth form, 2 tooth point too low, 3 tooth point too high, 4 broken-off tooth, 5 tooth space distance too much
1. Correct tooth form__________
2. _________________________
3. _________________________
4. _________________________
5. _________________________
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