MFM-204-16

2 and 3 flute chatter-reduction end mills with necked reach and radii — the tool that took an automotive aluminum part from 41 hours to 1 hour, in short to extra-long reaches.

• 2 flute (FM-201–205) and 3 flute (FM-301–305), 40° helix, with Feather Blend, necked reach, and Mirror Edge chatter reduction
• Four reach lengths per diameter — short, medium, long, and extra-long (e.g. 1/4" tools reach 5/8" to 1-1/16"+ on a 3" OAL); other reach lengths available upon request
• Inch sizes 1/4"–1"; metric MFM line (2 & 3 flute, 201–205/301–305) runs 6–25 mm
• Corner options: square end, radii of .03", .06", .09" (plus .12" on larger sizes), and ball end (-BN); available uncoated or DLC coated
• Guide case story: an automotive aluminum part went from a 41-hour cycle time to 1 hour with the FM Series — no chatter and superfast feed rates at 450 ipm in an aluminum extrusion
• Guide speeds & feeds run at Max RPM with chip loads from .0040 (1/4") to .0160 (1") per tooth in 6061/7075/2024, at typical Z-depths of .150"–.250"
• Guide rule: Z-depth per pass should be deeper than the corner radius to help reduce chatter
• Applications: slotting, side milling, helical interpolation, ramping, high-performance 3-D (2-flute), roughing, semi-finishing, finishing — wet; materials: aluminum, copper, magnesium, brass
• h4 shank tolerance on all tools — up to 150% more gripping force to eliminate tool pull-out
• Series tolerances: cutting dia −.0007/−.0015 (3-flute pages list −.001/−.0015), shank −.0001/−.0002, flute length +.060/−.000, OAL ±.060

From the RobbJack Applications Guide.