AL3-303-20-250-TC

Next-generation 3-flute aluminum end mills with Mirror Edge chatter reduction — standard, long, and extra-long lengths to 5" of flute, with corner radii, ball ends, thru-coolant, and chip breakers on the long tools.

• 3 flute, 35° helix, with Mirror Edge and polished flutes — the guide's 'NEXT GENERATION' chatter-and-vibration eliminator for aluminum
• Three lengths per diameter: AL3-303 standard, AL3-304 long, AL3-305 extra-long — up to 5" flute length on an 8" OAL at 1" diameter
• Inch sizes 1/8"–1"; corner options from sharp corner through radii of .01", .03", .06", .09", .12", .19", and .25" (by diameter) plus ball-end (-BN) versions
• All AL3-304 (long) and AL3-305 (extra-long) tools come standard with chip breakers to control chips
• Four ways to buy every geometry: uncoated, DLC coated, thru-coolant uncoated (-TC), and thru-coolant DLC (-TC-DLC); on 1/8" and 3/16" diameters the thru-coolant version is a non-center-cutting single thru hole
• Guide depth-of-cut guidance by length: AL3-303 at 50% radial width and 2–3 × diameter axial depth; AL3-304 at 30% radial and 4 × diameter at 70% CLPT; AL3-305 at 10% radial and 5 × diameter at 70% CLPT
• Spring passes with long and extra-long tools may be needed to improve finish and deflection — RobbJack tested up to 4 spring passes with AL3-305 using the entire cutting length
• Applications: slotting, side milling, helical interpolation, ramping, high-performance roughing, semi-finishing, and finishing — wet; materials: aluminum, copper, magnesium, brass
• h4 shank tolerance for up to 150% more gripping force; series tolerances: cutting dia −.0007/−.0015, shank −.0001/−.0002, flute length +.060/−.000, OAL ±.060
• Due to the large offering, many AL3 items are made to order and non-returnable (per the guide)

From the RobbJack Applications Guide.