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Zund R43 3910737 Single-Flute CNC Router Bit

The Zund R43 3910737 is a single-flute router bit designed for compatible Zund CNC routing systems. It features a 3 mm cutting diameter, 3 mm shank and 11 mm maximum routing depth. Its right-hand twist design supports routing applications involving selected rigid plastic materials, including acrylic (PMMA) and polycarbonate (PC).

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Description
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Zund R43 3910737 Single-Flute CNC Router Bit

Specifications

Item Number: 3910737
Shank Diameter: 3 mm
Routing Diameter: 3 mm
Max. Routing Depth: 11 mm
Cutting Edges: 1 (Single O-flute, up-cut geometry)
Total Length: 38 mm
Max. Rotation Speed: Up to 80,000 RPM (depending on the tool spindle)
Recommended Materials
Rigid Plastics: Acrylic / Plexiglass (PMMA), Polycarbonate (PC), and PETG
Metals & Composites: Aluminum sheets and Aluminum Composite Materials (ACM / Dibond)

Performance Characteristics
The R43 is optimized for heat-sensitive plastics. Its single O-flute geometry features a highly mirrored inner grind that reduces friction as plastic chips pass through the tool. Because it is an up-cut bit, it aggressively evacuates hot chips upward out of the groove, preventing them from melting and welding back to the freshly cut edge. This rapid chip clearance is crucial for achieving a crystal-clear, smooth finish on acrylic without requiring secondary flame-polishing.

While the R43 shares the exact same 3x3x11mm dimensions as the R75 bit, the R43 features a specialized raker grind tailored specifically for the hardness profiles of acrylic and aluminum, whereas the R75 features an all-round geometry more suited toward dense foams and woods.

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