Каталог оснастка Dormer Pramet 2016

	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
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-

Pramet tool holders are balanced to G 6.3/15 000 rev/min

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

Каталог оснастка Dormer Pramet 2016 - страница 262