Tips for peck milling • Reduce the table feed by 50 % of the recommended conditions until the center core part is completely cut off. The internal cutting edge's radial rake angle is large in the negative direction. • Min. cutting length for flat bottom face is as the list on page 11. Tips for ramping • Ramping angle should be under αmax (refer to table on page 11). • Feed rate should be under 70 % of the cutting conditions. L X Center core φD αmax ap Formula for max. cutting length (L) at max. ramping angle ap L= tan αmax Tips for helical milling • Sinking depth (h) at helical milling should be under max. ap. Sinking angle α (with programmed tool path) should be under αmax (Maximum ramping angle). • Feed rate should be under 70 % of the cutting conditions. When cutting dia. Dh1 ≤ Dh < Dh2 • Climb milling is recommended. øDh Center core part remains after machining. Helical milling factors (Not removable with the same cutter) øD (Cutter diameter) Ds (Diameter of programmed tool path) | Ds = Dh-D øDs (Diameter of programmed tool path) øDh (Cutting diameter) π × øDs α sinking angle Formula for sinking depth (h) h = π × Ds × tanα (h should be under ap) (α should be under αmax) øD When cutting dia. Dh2 ≤ Dh ≤ Dh3 øDh øD Center core part remains after machining. (Removable by traversing with the same cutter) *Please refer to P11 the list below for Dh1 ~ Dh3. h (Sinking depth) Case studies MRX case studies Nozzle parts X5CrNi1810 Vc = 113 m/min fz = 0.14 mm/t ap × ae = 1.0 × 65 mm Dry MRX100R-12-9T-M (9 Flutes) 65 RPGT1204M0ER-SM (PR1535) 35 110 Mold part Tool steel (47-49HRC) Vc = 125 m/min fz = 0.25 mm/t Dap × ae = 1.0 ~ 2.0 × 10 mm Dry MRX20-S20-08-2T (2 Flutes) 380 RDGT0803M0ER-GM (PR1525) Slant face 80 230 Tool life PR1535 Conventional A 450 pcs/edge 100 pcs/edge Tool life 4.5x Tool life PR1525 Conventional B 2 pcs/edge (with Stable machining) 1pcs/edge (with unstable tool life) Tool life 2x+ Cost savings with 4.5 times longer tool life with 1.5 times more insert edges. MRX prevented burr formation and improved surface finish. (User evaluation) Conventional tool only machined 1 workpiece due to unstable tool life,but the MRX doubled the tool life with stable machining. (User evaluation) 4
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