Calculate chamfer depth and Z-axis offset from chamfer width and angle. Essential for CNC chamfer milling, edge breaking, and deburring operations on 3-axis and 5-axis machining centres.
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Request a Proposal →A chamfer is specified by its width and angle. When programming a chamfer mill, you need the axial depth (how deep the tool goes) and the Z-axis offset from the sharp corner. This calculator converts the chamfer specification into CNC-ready values.
Chamfer depth is how far the tool plunges axially. Z offset is how far the tool's centreline must move from the sharp edge in Z. For a 45 deg chamfer, depth = Z offset = chamfer width. For steeper angles, the Z offset is larger than the depth.
Yes, for small chamfers under 2 mm. Spot drills typically have a 90 deg included angle (45 deg per side). For production chamfering, use a dedicated chamfer mill -- it has more flutes, better edge geometry, and produces a cleaner finish.
Use 50-70% of the standard slotting feed rate for the same tool diameter. Chamfer tools engage a small portion of the cutting edge, so chip thinning applies. If the tool has a dedicated chamfer geometry, follow the manufacturer's recommended parameters.
Enter the chamfer width (flat-to-flat) and the chamfer angle. The calculator gives the axial depth of cut and the Z-axis offset. Use these values in your CAM chamfer operation or manual G-code programming.
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SPECIFYING CHAMFERS? Chamfers are the most commonly dropped dimension on an inquiry and the most common cause of a re-cut. See what to include in a tooling specification.
Chamfer mills, countersinks and spot drills are ground to the angle and diameter your part needs — not picked from a stock list. Send the included angle, the tip diameter and the workpiece material.