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Tooling Interface
HSK
HSK (the German abbreviation for “hollow shank tooling”) is the newest and most advanced machine tooling option available. Developed in response to increased demand for high speed capable tooling in the automotive and aerospace industries, HSK offers greater accuracy and repeatability, along with reduced weight and tool change cycle times.
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CAT/ISO/BT
The oldest and arguably most common type of tooling used in the USA. Sometimes called V-flange tooling, CAT tooling was invented by Caterpillar, Inc. of Peoria, Illinois in an attempt to standardize machine tools. The most common sizes include CAT-30, CAT-40 and CAT-50. The number refers to the National Machine Tool Builders Association (NMTB)) Taper size of the tool.
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Collet
Collets are the most widely used tool holding system in the world. Used for a variety of operations including boring, tapping, and grinding collets allow for rapid manual tool changes and are capable of very accurate tolerances. While there is some standardization (5C and R8) there are many proprietary collets, which can make interchangeability difficult.
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Grinding Taper
1:4 grinding taper is equivalent to a 3’’ taper per foot and is a standard grinding wheel adaptor for spindles. This taper allows a grinding wheel to be mounted securely to the spindle nose. Tightened with a securing nut, this type of spindle should only spin in one direction to avoid any loosening effects.
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Other
There are many other types of tooling interfaces available today, however they are becoming less common each year. Some of these include Morse Taper, Jacobs Taper, Komet ABS, and Hardinge Collets among many others.
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