ROUGHING END MILL_C610

Tool material

HSS-E (HSCo) is harder and more wear resistant than standard HSS, but it absorbs shock and vibration less well. Unstable cutting conditions can chip the edges or break the tool, so use a rigid machine set-up and good tool holding.

Tool holding

All cutters in this range have standard Weldon shanks. Weldon type holders are normally used, but higher quality tool holding gives better results with HSS-E cutters.

Cutting data

Dormer Pramet's end mill catalogue gives starting cutting speeds (SFM) and feed codes for C610 by workpiece material group (WMG). It lists no starting values for austenitic and duplex stainless steels (M3, M4) or for hardened materials (H).

Ordering and cross reference

• Order by ordering code (C610 + diameter, e.g. C6101/2 for 1/2 inch) or by the 7-digit EDP number.
• C610 replaces the previous Dormer style 9003 (previous EDP numbers 5210028 to 5210037).
• Coated alternative: C611 has the same dimensions with TiCN coating (no 9/16 inch size).

The DORMER PRAMET C610 is a cobalt high speed steel (HSS-E) roughing end mill from the Dormer range of HSS, HSS-E and HSS-E-PM end mills. Its scalloped coarse roughing profile is designed for maximum metal removal in one pass. This makes it suited to removing large amounts of stock before a separate finishing operation.

Key features

• Coarse roughing profile on the cutting edges for maximum metal removal in a single pass.
• HSS-E (high speed cobalt) substrate, which is harder and more wear resistant than conventional HSS.
• 30° helix angle, square end and regular length of cut.
• Bright (uncoated) finish. The same geometry is also available with TiCN coating as series C611.
• 4 flutes on diameters 1/4 to 3/4 inch and 5 flutes on 7/8 and 1 inch.
• Standard Weldon shank for secure clamping in Weldon type holders.

Applications

Dormer Pramet HSS end mills are made for general milling such as slotting, plunging, side and face milling, ramping and copy milling, depending on the style selected. C610 is the coarse-profile style for heavy roughing. The catalogue gives starting cutting data for these material groups: steels (P), ferritic and martensitic stainless steels (M), cast irons (K), non-ferrous materials including aluminium, copper alloys and thermoplastics (N), and titanium and heat resistant alloys (S).

The tool is a one-piece solid HSS-E cutter. It has a cylindrical Weldon shank and a helical roughing cutting section with a square end.

• d1 – cutting diameter: 1/4 to 1 inch
• l2 – length of cut (flute length): 5/8 to 2 inch
• l1 – overall length: 2-7/16 to 4-1/2 inch
• d2 – shank diameter: 3/8 to 1 inch, Weldon type

The flutes run at a 30° helix, and the cutting edges carry a coarse scalloped roughing profile along their length. The 4 flute version covers 1/4 to 3/4 inch and the 5 flute version covers 7/8 and 1 inch. Shank sizes are as follows. Sizes 1/4 and 5/16 inch use a 3/8 inch shank. Sizes 7/16 and 9/16 inch use a 1/2 inch shank. Size 7/8 inch uses a 3/4 inch shank. All other sizes have a shank equal to the cutting diameter.

Choosing the right Dormer HSS-E roughing end mill

• Coarse profile (C610): gives maximum metal removal in one pass.
• Fine profile: gives a stronger cutting edge and longer tool life than a coarse profile.
• TiCN coating: lowers the coefficient of friction and improves wear resistance.
• Long length: gives a longer cut length for milling deeper pockets.

Starting cutting speed by workpiece material (C610)

These are starting values from the Dormer Pramet end mill catalogue. The letter is the feed code; use it to read the feed per tooth (IPT) in the table below.

Feed per tooth (IPT) for HSS milling at ≥ 50% radial immersion

Use the row closest to the tool diameter. For radial engagement below 50%, or for slotting at different depths of cut, apply the correction factors given in the Dormer Pramet catalogue.