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- To reduce the often long machining time while achieving a high degree of size consistency.
- To eliminate rings in the bore, produced by the rough pass reamer that are often stuck in the component and need to be removed manually.
The new process strategy and technology replace straight flute tools with helix tools to eliminate the problem with rings. The reinforced core diameter and extra guide pads give a straight hole with excellent size consistency.
In addition, the cycle time is often reduced by more than 50 %.
Step 1: Solid carbide twist drill
Drawing no. 289412.1200, N = 3881 rpm, Fn = 0.25 mm/rev.
Step 2: Solid carbide 3-flute step drill
Drawing no. 212891/999999, N = 2000 rpm, Fn = 0.4 mm/rev.
Step 3: Solid carbide 3-flute step drill
Drawing no. 212851/999999, N = 2160 rpm, Fn = 0.35 mm/rev.
Step 4: Solid carbide drill
Drawing no. 212120/999997, N = 2158 rpm, Fn = 0.35 mm/rev.