Page 382 - Carmex - Metric Catalog 2021

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Mill-Thread Technical Section

Cutting Data

MT Drill - MTD

Carbide grade K20: Uncoated Sub-Micron carbide grade dedicated for machining Aluminum
and Cast Iron.
MT7: Sub-Micron carbide grade combines high hardness and toughness, with
PVD triple coating for smooth cutting and high performance.

Feed mm/r Feed mm/tooth
Cutting Speed Cutting Diameter = D Cutting Diameter = D
Material Materials m/min
Group Drilling Mill Thread
K20 MT7 D≤4 4<D<6 D≥6 D≤4 4<D<6 D≥6

K Cast Iron 50- 80 80-120 0.10-0.15 0.15-0.20 0.15-0.30 0.005-0.03 0.01-0.05 0.02-0.10

Aluminum ≤12%Si, 100-250 100-350 0.06-0.10 0.10-0.20 0.20-0.30 0.005-0.04 0.01-0.06 0.02-0.13
Copper
N Aluminum >12%Si --- 80-180 0.05-0.07 0.10-0.15 0.15-0.25 0.005-0.04 0.01-0.06 0.02-0.13

Synthetics, Duroplastics, 60-100 80-180 0.10-0.20 0.20-0.30 0.20-0.30 0.005-0.04 0.01-0.06 0.02-0.13
Thermoplastics
MT Drill working cycle

Start End
Position point

Right hand
cutting

Moving Arc Thread Arc
Drill &
Chamfer up entrance Milling Exit
1/3xP 1/8xP 1xP 1/8xP

B12-20