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Narrow parting tools are manufactured and easily ground from wider parting tools (figure 2.2). Spindles should be parted off with a skew or a parting-off tool, not a parting tool.

Figure 2.2 Four parting tools. From left to right: one with a “diamond” cross section 5-mm wide, one with a rectangular blade 6-mm wide and 20-mm deep, a 2-mm-wide tool, and a 6-mm-wide tool ground to give a 1.5-mm-wide cutting edge.

All are ground and honed to a 30° sharpening angle because they are cutting, not scraping, tools.

By repeatedly and slightly axially rotating a parting tool clockwise then anticlockwise as you thrust it forwards, you cut a slightly wider trench. So as not to indent the toolrest, soften the sharp edges along a parting tool’s blade.