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Shaping and finishing of faces curved by sawing tools involve the following operations:
- Clamping of the workpiece with the faces to be worked on top, if possible.
- Shaping and finishing.
The selection and use of the tools depend on the shape and size of the curves.
- Slightly curved radii are worked with:
· plane with adjustable face,
· fine-set double plane,
· scraper,
· sanding tools.
- Slightly curved hollow faces are worked with:
· plane with adjustable face,
· plane with fixed, curved face,
· scraper,
· sanding tools and sanding pads with adequate shape.
- Highly curved radii are worked with:
· flat rasps,
· flat files,
· scraper,
· sanding tools.
- Highly curved hollow faces are worked with:
· half round rasps,
· half round files,
· flat round files,
· scraper,
· sanding tools and sanding pads with adequate shape.
Curved faces are worked with rasps and files with
- one hand gripping the handle of the tool,
- the other hand guiding the tool at the blade,
- the tool guided with the wood grain, if possible, or obliquely to the wood grain,
- the tool guided parallel to the curving.
Figure 10 Guiding of rasps and files
1 gripping of the tool at the handle, 2 guiding of the tool at the blade, 3 guiding with and obliquely to the wood grain, 4 guiding parallely to the curving
Checking of the curved faces for:
- working accurate to shape
· with templates placed on the face and compared with the face to the light-gap method.
Figure 11 Checking a curved face with
a template
1 workpiece, 2 template
- smoothness by
· sighting
· touching.
Why must the rasps, files and sanding tools be guided preferably
with the wood grain or obliquely to the wood
grain?
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