Recommended Tools and Machining Parameters Applicable to:
Be aware that the cobalt-base alloys in these categories (25 and 188) can require different feeds and speeds (as noted in the table) than the nickel- and iron-based alloys.
General note: Use high pressure coolant systems and through the tool coolant, when possible.
*To convert to surface m/min, multiply by 0.305
**To convert from in to mm, multiply by 25.4
1SCEA = side cutting edge angle, or lead angle of the tool
2At any point where dry cutting is recommended, an air jet directed at the tool may provide a substantial increase in tool life
3Oil coolants should be premium quality, sulfo-chlorinated oils, with extreme pressure additives; a viscosity of 50 to 125 SSU at 100°F (38°C) is standard
4Water-based coolants should consist of a 15:1 mixture of water and either a premium quality, sulfo-chlorinated, water-soluble oil or a chemical emulsion, with extreme pressure additives
5Water-based coolants may cause chipping or rapid failure of carbide tools in interrupted cuts
6Depending upon the rigidity of the set-up
7M-40 series high speed steels include M-41 through M-46 at time of writing; others may be added and should be equally suitable
Wear & Corrosion-resistant Alloy
ULTIMET® alloy can be successfully turned, drilled, and milled if appropriate tooling and parameters are employed. However, the alloy possesses high strength and work hardens rapidly. Machining guidelines specific to ULTIMET® alloy are as follows:
Turning (ULTIMET® alloy)
Carbide (not high speed steel) tools are recommended.
Surface speed: 60-70 surface ft./min (0.30-0.35 m/s).
Feed rate: 0.005-0.010 in (0.13-0.25 mm).
Depth of cut for roughing: 0.05-0.10 in (1.3-2.5 mm).
Depth of cut for finishing: 0.010-0.015 in (0.25-0.38 mm).
Drilling (ULTIMET® alloy)
Carbide tipped or high speed steel drills are recommended.
Surface speed: 30-35 surface ft./min (0.15-0.18 m/s) for carbide tipped drills; 8-10 surface ft/min (0.04-0.05 m/s) for high speed steel drills.
Feed rate: 0.004 in (0.1 mm) per revolution for 0.25 in (6.4 mm) diameter and greater.
135° included angle on point.
Milling (ULTIMET® alloy)
Carbide (not high speed steel) end mills are recommended.
Surface speed: 25-30 surface ft/min (0.13-0.15 m/s).
Feed per tooth: 0.002 in (0.05 mm) for cutter diameters below 0.75 in (19 mm); 0.003 in (0.08 mm) for cutter diameters above 0.75 in (19 mm).