Long angle lathe files are used exclusively for lathe filing, which involves mounting a workpiece on a lathe and rotating it at speed. For more information, see: What is lathe filing?
What are the characteristics of a long angle lathe file?
Cross section and profile
A long angle lathe file is blunt, and rectangular in cross section.
Cut
It is single cut on both faces and safe on both edges, which prevents accidental damage to raised sections of the workpiece during filing.
The long angle of the teeth allows filing without snagging and also causes chips to be cleared during the lathe filing process, as the rotation of the workpiece pushes any chips or waste material back along the teeth with less chance of pinning.
What is a ‘long angle’?
In this case, the term ‘long angle’ refers to the fact that the file’s teeth are tilted more towards the handle of the file, which means each individual tooth is longer.
Size
Long angle lathe files are usually available in lengths from 200mm (8 inches) to 350mm (14 inches).
Swiss or American?
Long angle lathe files are American pattern files.