Page 402 - Carmex - Inch Catalog 2022

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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 inch/r Feed inch/tooth
Cutting Speed Cutting Diameter = D Cutting Diameter = D
Material Materials ft/min
Group Drilling Mill Thread
K20 MT7 D≤.16 .16<D<.24 D≥.24 D≤.16 .16<D<.24 D≥.24

K Cast Iron 160 - 260 260 - 390 .0039 - .0059 .0059 - .0079 .0059 - .0118 .0002 - .0012 .0004 - .0020 .0008 - .0039

Aluminum
≤12%Si, 330 - 820 330 - 1150 .0024 - .0039 .0039 - .0079 .0079 - .0118 .0002 - .0016 .0004 - .0024 .0008 - .0051
Copper
Aluminum
N >12%Si --- 260 - 590 .0020 - .0028 .0039 - .0059 .0059 - .0098 .0002 - .0016 .0004 - .0024 .0008 - .0051
Synthetics,
Duroplastics, 200 - 330 260 - 590 .0039 - .0079 .0079 - .0118 .0079 - .0118 .0002 - .0016 .0004 - .0024 .0008 - .0051
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

B12-22