The Rasp Guide

A rasp is similar looking to a file in terms of shape, however their working faces are significantly different.  They have individually raised teeth, referred to as stitches, evenly dotted over the entire surface of the working face and are used for shaping wood. Stitching can be made by machine or by hand, however it is more common to see them machine manufactured. Rasps are one of the few tools that cannot be altered by the user and the cutting parts cannot be replaced, this means that their lifespan is determined by how frequently they are used, but, when used with care, it is unlikely that you will have to replace the rasp in a lifetime of use. They can come in several different lengths, the smaller ones are usually used for finer, closer work and the larger ones for general woodwork. Some rasps have a number on which determines the number of stitches and therefore the texture of the worked surface. The lower the number, the larger teeth it has and the more material it will remove. Not all rasps have numbers, though.

Uses

Rasps are used to remove material quickly, usually they do not produce as smooth a surface as a file. They are most useful in removing large and small bumps and for rounding sharp edges and corners. They can be especially useful in shaping end grain and other areas that are difficult to work with planes, chisels or saws. Rounded rasps are useful when working with concave areas in wood.

Terminology

Stitching- This is the process by which a small punch is used to create indents in the steel face of the rasp which raises a part of the steel which creates a tooth. This process can either be done by machine or by hand

Teeth- These are the small raised cutting edges on the surface

Types of Rasps

  • Rasp
  • Cabinet Rasp (Used for finer work, often tapered at the end to reach smaller places)
  • Four-in-hand Farrier’s Rasp (This has both a flat and rounded face and each end, one end is a File and one is a rasp, making it a 4-in-1 tool)

Parts of a Rasp

Without Highlighting

With Highlighting

Rasp

File

3 Comments

  1. Carlos M. Zaccaro on 31 July 2018 at 6:50 pm

    Hi!
    There are some kind of rasps with no stitches but regular “linear teeth” instead… (I tried to paste a photo here but wasn´t able to).
    What are they used for? I know they´re are woodworking tools since I inherited from an ancient woodworker, but don´t know how to use them… Would you like to see the photos? Please give an email address.

    • Izzy Berger on 2 August 2018 at 10:45 am

      Hi Carlos,

      Unfortunately we cannot answer this, we recommend searching online for more information about your specific rasp.

      Sorry we couldn’t be of more help.

      Kind Regards,
      Izzy

    • Alec Garner on 9 December 2018 at 4:03 pm

      These could well be ‘plane maker’s floats’ used for working the mouth and beds of wooden planes (the area where the blade and wedge sit). Due to the inaccessibility of these areas; a tool is required that leaves a consistent and fine finish that requires no further work, hence the linear tooth pattern.

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