Metal Lathe Tools - Cutoff / Parting Tools
  • Angles shown are good for hobbyists; grinds for production shops should consult a specialist.

  • Angles shown are the effective angles, not the ground angles. Effective angles are increased or decreased, based on the angle by which the tool is presented against the work. Additionally, the vertical alignment of the tool (vs. the center line of the work) can also change the effective Front Relief Angle.

  • All angles are given the nomenclature designated by the American Standards Association (ASA).
Carbide vs. HSS
Material Compressive Strength Shear Strength Max Usable Temp. *
Cemented Carbide Higher Lower 1,800 ℉
HSS Lower Higher 950 - 1,100 ℉

* Temperature at which the tool material begins to soften appreciably. For HSS, it depends on the level of cobalt in the HSS.

Tool Shape - Side View
Use Front Relief Angle Comments
Recom. Range
5º - 10º Angles shown are the recommended effective angles, not the ground angles. Greater relief angle will be needed when an upward-facing angle of presentation of the tool is used.

Tool Shape - Top View
Use Front Cutting Edge Angle Comments
Recom. Range
General 90º 70º - 110º 90º is recommended, but some like to skew the cutting edge. I've found that problematic on T-shaped cutters as they will tend to drift to one side.

Notes & Comments
Information regarding Grindstones

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