END MILL_C246

Standards

• Dimensions: DIN 844 K, short series
• Shank: DIN 1835 B Weldon shank

Operations

• Shallow shoulder milling: primary use
• Shallow slot milling: primary use
• Ramping: primary use
• Helical interpolation: possible use

Workpiece materials

• P: free machining, plain carbon and alloy steel
• K: cast iron
• N: copper and copper alloys
• S: titanium and titanium alloys

Usage notes

• HSS-E-PM has a fine grain structure with high edge strength and toughness. A rigid set-up and good tool holding are still important to avoid shock and vibration that can chip or break the cutting edges.
• Weldon type holders are typically used with this shank, but higher quality tool holding can give better results with HSS-E-PM cutters.
• Use the shortest tool and the largest diameter the application allows, and the shortest length of cut the depth of cut permits.
• Take starting cutting speeds and feeds for each workpiece material group from the Dormer Pramet catalogue or website.

Dormer Pramet C246 HSS-E-PM TiCN End Mill, DIN 844 K

The C246 is a multi-flute, short series end mill from Dormer Pramet for general-purpose milling. It is made from powder metallurgical HSS-E (HSS-E-PM), a high speed cobalt steel with a finer grain structure that gives superior edge strength and toughness. It is finished with a TiCN coating that lowers friction and improves wear resistance, giving better chip flow and longer tool life.

Key features

• Powder metallurgical HSS-E (HSS-E-PM) substrate for a strong, tough cutting edge
• TiCN coating for higher wear resistance and lower friction
• 30° helix angle and 12° rake angle
• 4 flutes (5 flutes on 22 mm and 25 mm), square end, centre cutting
• Weldon flatted shank to DIN 1835 B with h6 shank tolerance
• Short series dimensions to DIN 844 K, k10 diameter tolerance
• Diameter range 2 to 25 mm

Applications

Designed for shoulder milling, slot milling and ramping, and can also be used for helical interpolation. Suitable workpiece materials include free machining steel, plain carbon and alloy steel, cast iron, copper and copper alloys, and titanium and titanium alloys.

The C246 has a cylindrical Weldon shank with a clamping flat to DIN 1835 B. The cutting section has helical flutes with a 30° helix angle for right-hand cutting and ends in a square, centre-cutting end face.

• d1 – cutting diameter, 2 to 25 mm (k10)
• d2 – shank diameter, 6 to 25 mm (h6)
• l2 – length of cut, 7 to 45 mm
• l1 – overall length, 51 to 121 mm

Some larger sizes have a neck relief behind the flutes for extra reach. Examples: 10 mm diameter, 31.5 mm reach; 12 mm diameter, 11.5 mm neck diameter and 37.5 mm usable length; 20 mm diameter, 19.5 mm neck diameter and 53.5 mm usable length.

C246 or C247?

Dormer Pramet also offers the C247, a bright (uncoated) HSS-E-PM end mill with the same 30° helix, 12° rake angle and DIN 844 K short series dimensions. Choose by workpiece material:

Choose the C246 for alloy steel, cast iron and titanium alloys, or wherever longer tool life is wanted, because the TiCN coating lowers friction and improves wear resistance. The bright C247 is intended for free machining steel, plain carbon steel and copper alloys.

Dormer Pramet material groups for the C246