|Metal Lathe Tools : Cutoff / Parting Tools|
* 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|
||7°||5° - 10°||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|
|General||90°||70° - 110°||90° 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.|
If grinding this on a high speed grinder, be sure to manage the temperature so that the temper is not lost due to overheating. If there is a carbide insert, DO NOT cool by dipping in water. This will cause the carbide to crack due to shocks. Otherwise, cool by dipping as needed in water.
For resharpening, a contour gauge like shown below is recommended. One should be made for each tool, and it should be numbered to match the tool's number.
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