What is a rasp?
What is a rasp? |
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A rasp is a very similar tool to a file, in that it is a shaped metal bar with teeth that shape or smooth a surface through abrasion. | |||
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However, rather than having teeth cut or etched in linear patterns, rasps have each tooth individually punched into the body of the tool with a triangular punch. | |||
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This can be done by hand or by machine. The process is known as ‘stitching’. | |||
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This type of configuration of teeth is suited to much softer materials than metal. Rasps are your go-to tool when working with wood and should always be used instead of files where possible. The only exception to this rule is the use of Japanese carving files, which were also designed specifically for wood.
For more information, see: |
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Rasps are also used on materials such as plastic or horse’s hooves, as their individually cut teeth can get more of a ‘bite’ than the uniform pattern of teeth found on files. | |||
Machine stitched rasps vs. hand stitched rasps |
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With most tools, consistency and uniformity are important to ensure quality.
However, machine stitched rasps have all of their teeth set out in neat rows. Each successive tooth is behind another, which means that the rasp effectively carves grooves into the workpiece rather than creating a smooth, even finish. |
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In the case of hand stitched rasps, the layout of the teeth is not so uniform, meaning material can be removed much more smoothly and the grooving effect is avoided. | |||
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You should be able to tell if your rasp has been machine stitched or hand stitched by looking at the teeth. In some cases, the information may be present in the product specification. | |||
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