Tool Encyclopedia

2. Hollow-taper-shank Tooling: HSK

HSK solid type turning holder

HSK disadvantages

Standard HSK tooling may not satisfy every need. In some cases, a shop's existing equipment may force it to machine parts in conditions beyond recommended guidelines, and the HSK design may need to be tweaked to avoid overloading the system. In other cases, a shop may need a different type of HSK to reap the benefits of the concept when the dimensional constraints of its equipment or some historical or company preference make it difficult to use standard products.

You should keep it cool. All HSK assemblies provide through-the-spindle coolant. Forms A, C, E, and F provide coolant directly through the center of the holder. Forms B and D provide coolant through the rear of the flange. Because the coolant changes direction in forms B and D, it cannot be applied at the maximum pressure and flow rate; the psi and gpm need to be modified. Therefore, the use of these HSK holders can be problematic in indexable drilling and other operations that require high-velocity coolant application.

HSK users also should consider a spindle-cooling system. Due to the excessive heat generated by high-speed machining operations, it will probably be necessary to have a cooling system for the HSK spindle. The system will help extend spindle-bearing life, reduce thermal expansion, and improve the performance of the spindle and toolholder.

You should keep it clean. When using HSK assemblies, it is especially important to keep the work environment clean. The simultaneous fit between the flange face and the spindle makes the HSK toolholder and spindle more vulnerable than standard-taper assemblies to contamination by chips and debris. Due to the tight tolerances of the mating surfaces, contaminants will significantly shorten the life of the HSK spindle and toolholder. Piece-to-piece quality can suffer as dimensions begin to vary. Contaminants between the flange surfaces will reduce concentricity and surface contact by causing the toolholder to tilt slightly.

To avoid negative effects of contamination, the tools, the toolholders, and the spindle must be kept clean during normal operating conditions. All tool shanks should be wiped clean before they are mounted into the tool magazine. When tools are not in use, they should be stored in a toolroom or shielded in some way from the working area. The spindle should have provisions to clean itself and the tool during a tool change; a blast of air through the spindle blows contaminants away from the spindle ID and the toolholder.

Hollow-taper-shank Tooling: What is HSK? Why HSK tooling system? HSK types. HSK advantages. Comparison with CAT/DIN/BT

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