Каталог оснастка Dormer Pramet 2016 - страница 262

Предыдущая страница Следующая страница

Навигация

Balancing limits In accordance with DIN ISO 1940 the balance grade cally feasible and the economically efficient. Because is denoted with G as well as the units gmm/kg or μm the radial interchange accuracy for a brand-new respectively and is relative to the number of revolu- HSK holder can be 2 to 3 μm and for an ISO taper shank tions. At a speed of 15,000 rev./min and a weight of holder can be 5 to 10 μm, it means an initial quality 1 kg, G 6.3 corresponds with a permissible center limit of G 2.5 or G 6.3 respectively at 10,000 rev./min. deviation between rotational axis and center of gra- The following diagram shows the quality grades to vity axis of the spindle of 4 μm. At twice the speed of DIN ISO 1940-1, i.e. the permissible rest imbalance DIN 69871 30,000 rev./min it would be 2 μm. If the tool holder was in relation to the balance body mass for different only half the weight, i.e. 0.5 kg, the permissible coun- counterbalance qualities G relative to the maximum ter balancing tolerance is also halved. Aim of counter operating speed. balancing is to find a compromise between the techni- ISO 60 MA S 403 BT DIN 2080 HSK-A Pramet tool holders are balanced to G 6.3/15 000 rev/min VDI Fine-balanced with Pre-balanced with Pre-balanced with balancing bores in the flange balancing bores at the collar balancing flat at the tool body MORSE 261