HM-602-20

Multi-flute (4–10 flute) 45° helix die/mold finishers — the best tool for open areas of floors and walls in hardened steels.

• Multi-flute Tuffy grade end mills with 45° helix, AlTiN coated — flute count scales with diameter: 4 flutes at 1/8"–3/16", 6 flutes at 1/4"–5/8", 8 flutes at 3/4", 10 flutes at 1" (metric 3–25 mm mirrors this)
• The guide's pick as the best tool for open areas of floors and walls — for tight areas like helical bores or tight corners use the TM/MTM Series
• Two tip styles: Style A (necked tip with 15° blend angle, on the 1/8"–3/16" and 3–4 mm sizes) and Style C (cutting diameter = shank diameter, 1/4"–1" and 5–25 mm)
• Corner radius on every size, from .015 (1/8") to .06 (3/4"–1"); metric 0.4–1.5 mm
• Rated for steels at 40, 50, and 64 HRc — high-performance roughing, semi-finishing, and finishing of side walls; run dry, cold air, or spray mist with air or mist above 40 HRc
• Profiling guidance: 1 × diameter axial depth with radial width 5% of diameter at 30–50 HRc and 2% at 50–60 HRc; facing/floor finishing at 2% of diameter axial depth and 25% radial width
• Published speeds & feeds per tool: HM-402-04 (1/8") 17,000–20,000 RPM at 0.0008–0.001 CLPT in 30–40 HRc down to HM-102-32 (1") 1,000–1,700 RPM at 0.0024–0.0049 in 50–60 HRc
• Use climb milling for better finish and longer tool life; engage by helical interpolation or entering from off the part
• Special draft angles (blend angle), necked shanks, diameters, lengths, and corner radii available on a make-to-order basis
• Tolerances: cutting dia −.001/−.002, shank −.0001/−.0002, flute length +.060/−.000 (MHM: cutting dia −.025/−.050 mm)

From the RobbJack Applications Guide.