Problem:
Short tool life and poor performance of 6mm and smaller carbide
tools. This occurs because ER collets 6mm and smaller fail to
provide consistent T.I.R. and high rigidity. This increases tool
wear an drives up costs. |
Reasons for Problem: |
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1. ER collets 6mm and smaller allow 40% of the
collet to extend out of the collet pocket. This means 40% of the
jaws surface area does not properly collapse on the tool shank because
they are unsupported by the walls of the pocket.
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DNA collet on the left,
fits better than ER collet
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2. Because so much of the collet is out of the
pocket, when the ER nut contacts the shoulder of the collet, friction
causes it to twist the jaws of the collet during tightening. This
distorts the collet axis in the pocket contributing to inconsistent
T.I.R. Refer to the diagram and see how the DNA nut does not
contact the collet shoulder.
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3. On ER collets 6mm diameter and smaller, the
small jaws do not provide the holding force and rigidity on the shank
necessary to produce acceptable T.I.R.
Solution:
Use DNA Collets and nuts for consistent T.I.R. and to extend
tool life on all diameters under 6mm. DNA Collets provide more
shank support deeper into the pocket and greater rigidity than small
diameter ER collet nuts.
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DNA Collet
6 Large Jaws
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ER Collet
8 Small Jaws
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