The Hard Turning Experts

Video Overview

For decades Hardinge has been the leader in Hard Turning. Here you will find just some of the experience and information we have on Hard Turning.

Let our team of application engineers work with you to prove that when Hard Turning needs to be done, Hardinge is the right partner to use.

A sample Hard Turning Part is below:

Material: M2 Tool Steel --1" Bar
Hardness: 62 Rockwell C
Application: Machine Complete From Pre-Hardened Bar
Stock Removal: .1875" per side (total)
Tolerance: ± .0002"
Surface Finish: 6 RA
Machine: Hardinge T42SP with sub-spindle
Cycle Time: 5 minutes 50 seconds

Rough Turning:
Kennametal: CNGA-434T--K090
Finish Turning:
Kennametal: CNMA 432S 0420--KD050
Kennametal: GC4125--KD120

What is Hard Turning?

Hard turning is defined as the process of single point cutting of part pieces that have hardness values over 45 Rc. Typically, however, hard turned part pieces will be found to lie within the range of 58-68 Rc. The hard turning process is similar enough to conventional soft turning that the introduction of this process into the normal factory environment can happen with relatively small operational changes when the proper elements have been addressed.

Part Materials applicable to Hard Turning

The typical materials which are routinely used in hard turning include those of the following broad category descriptions:

  • Steel alloys,
  • Bearing steels
  • Hot and cold work tool steels
  • High speed steels
  • Die Steels
  • Case hardened steels
  • Waspoloy, Stellite and other aerospace alloys
  • Nitrited irons and hard chrome coatings
  • Heat treatable powered metallurgy

Should you Hard Turn or Grind?

Grinding shops should consider Hard Turning to help reduce setup and cycle times.