262 Каталог PRAMET 2016 Инструментальная оснастка для металлорежущих станков Стр.261

Каталог PRAMET 2016 Инструментальная оснастка Стр. 261 0262 Lab2u

Balancing limits In accordance with DIN ISO 1940 the balance grade is denoted with G as well as the units gmm/kg or m respectively and is relative to the number of revolutions. At a speed of 15,000 rev./min and a weight of 1 kg, G 6.3 corresponds with a permissible center deviation between rotational axis and center of gravity axis of the spindle of 4 m. At twice the speed of 30,000 rev./min it would be 2 m. If the tool holder was only half the weight, i.e. 0.5 kg, the permissible counter balancing tolerance is also halved. Aim of counter balancing is to And a compromise between the techni- cally feasible and the economically efficient. Because the radial interchange accuracy for a brand-new HSK holder can be 2 to 3 m and for an ISO taper shank holder can be 5 to 10 m, it means an initial quality limit of G 2.5 or G 6.3 respectively at 10,000 rev./min. The following diagram shows the quality grades to DIN ISO 1940-1, i.e. the permissible rest imbalance in relation to the balance body mass for different counterbalance qualities G relative to the maximum operating speed. 30 60 95 150 300 600 950 1500 3000 6000 9500 15000 30000 60000 max. operating speed in rev/min Pramet tool holders are balanced to G 6.3/15 000 rev/min Fine-balanced with balancing bores in the flange Pre-balanced with balancing bores at the collar Pre-balanced with balancing flat at the tool body / 261 MORSE VDI HSK-A DIN 2080 MAS 403 BT ISO 60 DIN 69871