Bespoke HSK Tool Holding

Bespoke Ultra-Precise Tool Holders with HSK Spindle Interface (DIN69893; for Grinding Wheels, Flycutter Discs)

To use the potenatial of an Ultra-Precision tool spindle an ultra-precise and dynamically neutral tool holding is required. Hence DIN 69893 compliant and commercially available HSK tool holders are suitable to only a limited extend with our tool spindle models ASD-H25 and ASD-H25A.

By making use of our highly specialized manufacturing – what of course includes our spindle solutions – and new balancing techniques we were able to develop and manufacture our Ultra-Precisision HSK tool holding solution UTS-x. Based on those we developped bespoke HSK tool holding solutions for our customers in the past with the following properties *):

  • Static Tool Run-Out:  < 0.8 micron
  • Balancing Quality:  G0,3 mm/s at 60.000 rpm **)
  • Repeatability, axial/radial:  < 0,2 µm
  • Compliance: DIN 69893

We are looking forward to developping custom and ultra-precise HSK tool holding for your application.

Hence our slogan: “Ultra-Precision meets Industrial Grade

*) if used with Levicron ASD-H25/A tool spindle

**) depending on diameter


Compliance / DIN:

Tool Clamping:

Available for Tool Shank Diameter:

Guaranteed Tool Run-Out *):

Guaranteed Balancing Quality *):

Repeatability *):

*) Bei Verwendung mit Werkzeugspindeln von Levicron

HSK-E25, HSK-E40 (DIN69893-E)

Depending on application

Depending on application

Depending on application

< G0,3 mm/s at 60.000 rpm

< 0,2 micron

  • Expample: Grinding Disc Arbor

Arbor for small to mid-sized grinding wheels with HSK-E25 spindle interface

  • Example: Flycutter Arbor

Arbor with HSK-E25 spindle interface to carry mid-size to large axial and radial flycutting discs

  • Example: Adjustable Tool Holders

Radially adjustable tool holder with HSK-E25 spindle interface, shrink fit tool clamping and balancing bores, DIN 69893

  • Tool Clamp Accuracy and Repeatability

Our highly specialized manufacturing allows us to guarantee a spindle taper run-out of under 50 nm. The same manufacturing technology is used to machine our Ultra-Precision HSK tool holders UTS-x for which we guarantee a tool run-out of under 0.8 micron and a balancing quality of better G0.3 mm/s at 60.000 rpm.

The picture on the right shows a tool run-out measurement of our ASD-H25 at a customer site and at 185 mm in front of the spindle nose. A measured value of below 0.5 micron confirms the quality and combination of our HSK tool interface and spindle taper.

As a standard test the tool change repeatability of every spindle is tested by our 4 x 90° reversal balancing test at top speed (lower picture). For this the residual imbalance of one of our UTS-x HSK tool holders is measured at 0°. Then the resdidual imbalance is measured after the holder was rotated by 90° against the shaft. This done three times. The distance from the midpoint of the resulting square to one of its corner represents the tool clamp repeatabilty where the imbalance is defined as an eccentricity of the tool holder mass. With this method we can guarantee a tool clamp repeatability of less than 0.2 micron.