The three different methods:
This is the simplest method which, however, cannot always be carried out because of the increased heat-treatment volumes. For instance, even fine threads or fittings up to H7 can be made before hardening. However, it is recommended that tests be carried out beforehand, because they can be reproduced with very high scores!
This is the most frequently carried out method. Here the machinist has to pay attention to the material involved. Machining is mostly easier for the types ADI 800-8 and ADI 1000-5 than for such as EN-GJS-600-3, as the ADI does not have such a high amount of hardness scattering and can thus be more uniformly machined. Ceramic cutting tools should be used for high-alloy and harder types.
This method is mainly used for high-alloy material qualities, because it is more economical to apply two stages of machining, as materials standing times are thus reduced.