ISO 23125:2010 specifies the requirements and/or measures to eliminate the hazards or reduce the risks in the following groups of turning machines and turning centres, which are designed primarily to shape metal by cutting. - Group 1: Manually controlled turning machines without numerical control. - Group 2: Manually controlled turning machines with limited numerically controlled capability. - Group 3: Numerically controlled turning machines and turning centres. - Group 4: Single- or multi-spindle automatic turning machines.