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What are crochet and round
edge joint files?

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Image of a DIYer using a file to smooth the inside of a rounded notch. This is the perfect task for a crochet or round edge joint file. Crochet and round edge joint files are machinist’s files that are used for finishing, smoothing and deburring slots with rounded edges.

What are the characteristics of crochet and round edge joint files?

Diagram of a rounded rectangular cross section

Cross section

Both crochet and round edge joint files are rectangular in cross section, with rounded edges.

Image showing the outline and cut of a crochet file

Profile and cut

Crochet files taper in width and thickness and are double cut on the sides and edges.

Image of a slot with rounded edges that can be further shaped with a crochet file. The combination of the tapered profile and rounded edges makes this the perfect file for shaping narrow semicircular slots, as both the rounded edges and flat faces can be put to use.
Image to show the outline and cut of a round edge joint file Unlike crochet files, round edge joint files are blunt. They are only cut on the rounded edges and their flat faces are safe.
A luthier filing a notch for a string in the nut of a guitar These safe faces allow the file to create precise semicircular grooves, such as the ones found in guitar nuts, maintaining a consistent width all the way down.
A hinge in a vice, ready to be deburred by a DIYer This also makes them ideal for deburring hinges, as the large safe edges help to prevent wearing down an unwanted part of the hinge by accident.
An indication of the range of lengths in which crochet files are usually available

Size

Crochet files are usually available in lengths from 100mm (4 inches) to 200mm (8 inches).

An indication of the range of lengths in which round edge joint files are usually available Round edge joint files are around 162mm (6 1/2 inches) long.
Flag of Switzerland - home of the Swiss pattern file invented by F. L. Grobet in the 19th Century

Swiss or American?

Crochet files and round edge joint files are Swiss pattern files.

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