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 Tungsten Carbide Burr are ideal for shaping, smoothing and material removal. The tungsten ones are used on hardened steel, stainless steel, cast iron, nonferrous metals, fired ceramics, plastic, hard wood, especially on hard materials whose hardness can be above HRC70. To debur, break edges, trim, process welding seams, surface processing.
Step Drills represent a number of issues that need to be carefully evaluated.
Most common reasons why manufacturing or tooling engineers recommend step drills.
1) It is their desire to reduce machine time, thus reduce part cost.
2) Get a number of diameters at the same time.
3) Eliminate tool changes.
Granted there may be situations, which mandate or justify the use of step drills, such as a limited number of positions available relative to the number of operations required, etc.
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