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Line 577: * Checking the workpeice hardness using the ultrasonic tester * Hard material turning is normally done without coolant * Swarf will come off HOT, depending on circumstances maybe up to red-hot * Rigidity of set-up it vital, pay special attention to stick-out and tool position relative to the slides ** Lock any slides you're not using * Examine the toolholder carefully when fitting a hard-turning insert, all parts must be in excellent condition or be replaced. * Hard turning requires relatively high spindle powers, be sure not to overload and stall the lathe Line 594 ⟶ 596: Breaking a chip is unlikely, expect birds-nesting Depths of cut and feed rates should be low, ideally <0.1mm Surface speeds around 50-~~100~~75 m/min, the harder the material the slower the cut but go as fast as possible for any given job, CNC machines can run faster than this but our set-up won't allow it. * Diamond tooling exists for use in hard non-ferrous materials and highly abrasive materials **** Diamond tooling comes in PolyCrystaline Diamond (PCD) which is very expensive - more so than CBN, and MonoCrystaline Diamond (MCD) which is eye-wateringly expensive.

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