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Intelligent Technology for any ShrinkFit Application
ShrinkFit machines and toolholders have taken a large portion of the total market for
toolholders. Users who require tooling capable of extremely precise holding, especially in highspeed
applications, are insisting on ShrinkFit technology.
In the aerospace, automotive, and mold and die industries, ShrinkFit technology is the accepted
as standard in most applications.
The most important factor to consider when evaluating ShrinkFit technology is the ability of the
ShrinkFit machine and toolholder to function together reliably to consistently deliver the best
machining results possible.
The ThermoGrip® Group is one of the world’s leading forces in ShrinkFit technology. The
ThermoGrip® Group unites three industry-defining companies, Diebold, Bilz, and Komet, in the
pursuit of excellence.
ShrinkFit technology was pioneered by Marquart GmbH, one of the founding members of the
ThermoGrip® Group. Marquart was dissolved in 2008, and the ThermoGrip® Group acquired all
patents and trademarks relating to its ShrinkFit products.
Diebold is pleased to offer Pyroquart® ThermoGrip® toolholders, with the same quality and
contour Marquart customers have come to expect. Diebold also offer all the accessories needed
for convenience and ease of use of these fine toolholders.
The ThermoGrip® Group offers the latest innovations in ShrinkFit technology.
We offer six different ShrinkFit machines, each manufactured by the ThermoGrip Group®, to
ensure you get the machine that’s right for you...and your machining needs.
We offer toolholders from HSK E25 to HSK A125, with bore diameters of up to 50mm.
Naturally, this requires more than one type of machine. The ThermoGrip® Group offers units
with 3 kW, 8 kW or 11kW of power, from horizontal desktop-type machines to vertical floorstanding
machines, with optional built-in automatic water cooling or stand-alone manual water
cooling available.
Pic: ThermoGrip® Shrink Units

Chiller Unit FKS 03
An ingeniously simple, patented cooling device, the free-standing Diebold FKS 03 can be set-up
to handle any size or style of toolholder. The FKS 03 cools the tools gently and evenly, assuring
long toolholder life and accuracy.
Pic: Chiller Unit FKS03
Optimized Energy
To ensure the best results, all ThermoGrip® ShrinkFit machines are supplied with shrinking
parameters pre-programmed and matched to high-frequency generators. They have large,
easy-to-read digital displays, clearly visible even in the harshest shop environment. This
combination optimizes energy usage, minimizes tool-change downtime, and makes all of our
machines user-friendly.
Pic: Display of ShrinkFit Units
Painless Parameters
The most important part of the ShrinkFit process is the combination of power-level and time that
make up its’ parameters. Unless the energy output of the generator and the time the toolholder
is in contact with the field generated by it are in perfect balance, the toolholder may be
overheated. The resulting changes in the physical properties of the steel may damage or
destroy it.

Quality tools from Diebold
There are some basic questions that a user should ask their toolholder supplier before any
toolholders are purchased:
Was the correct material used to make them?
Is the toolholder hardened properly for the material that was used?
Is the toolholder functionally safe?
Is the toolholder properly balanced for the desired speeds?
Has the toolholder been through proper QC procedures?
Does the toolholder meet the Standard to which it was built?
If your supplier can’t, or won’t, answer these few simple questions, then you may want to
reconsider your purchase. With lesser-quality toolholders, you may, or may not, get toolholders
that meet the applicable Standards and have been properly manufactured to the correct
tolerances. Buying strictly for price is penny wise and pound foolish.
Pic: Hermann Diebold and his Quality Chef inspecting a “low cost tool” from a competitor
The smaller HSK toolholder sizes such as the HSK 25 and the HSK 32 have a very thin taper
cross-section. HSK 25 is only .8 mm(.035”) here, and the HSK 32, only 1.3mm (.051”). Care
must be taken that the taper is not through-hardened to avoid loss of strength at this crucial
spot. The material and heat-treatment must be optimized to ensure that the taper is hard
enough on the surface, yet retains enough core-strength to last.
The steel used in these toolholders must be able to withstand at least 500 degrees Celsius (950
degrees Fahrenheit) without altering the basic molecular structure of the toolholder or the
tolerancing of the bore.
Using the correct material and appropriate heat-treatment, we have documented tools with over
5000 tool-change cycles and no loss of accuracy whatsoever. You can get these same results
by using quality toolholders and machines.

Shrinking Slim and UltraSlim Chucks TSF / TUS
Extremely slim toolholders are particularly popular in the die and mold industry, as well as in
micromachining. The thin walls of these toolholders are susceptible to overheating and to
overstressing. The parameters of the shrink-cycle are critical.
Pic: Shrink Unit MS 502 with air cooler
To preserve the integrity of the thin wall (TSF stands for thin wall, TUS stands for ultra-thin wall)
toolholders, Diebold developed the MS 502 shrink machine. The generator has an output of 3
kW, and the correct parameters of the Slim and UltraSlim toolholders are pre-programmed in
the unit. By using pulsed power, the shrinking process is effectively controlled and the tool is
always protected against overheating.
When shrinking a cutting tool into a toolholder, an air-cooler is used to cool-down the tool
quickly and evenly. The toolholder is only heated to about 356 degrees Fahrenheit, and is then
moved into the cooling station.
ThermoGrip Chucks for machining graphite
Diebold uses a special, proprietary coating on their toolholders intended for the Graphite
industry. This ensures that the toolholder is corrosion-resistant, and minimizes the amount of
graphite adherence on the taper. This helps to eliminate one of the biggest causes of spindle
damage, ground-in particles.
Pic: TSF (Slim Fit) and TUS (Ultra Slim) Shrinkfit toolholders

Patented Opening Cylinder
Strikingly simple and effective, the patented Opening Cylinder serves
to center and align the cutting tool during the shrink-cycle. This translates to more precision and
less hassle when changing cutting tools. Simply set the cutting tool into the Opening Cylinder
and start the shrink-cycle. When the proper temperature is reached, the cutting tool, being
already aligned, will drop into place.
Pic: Patented opening cylinder
ShrinkCollets
Diebold offers an ER collet system that uses ThermoGrip® technology to improve on the
ubiquitous ER collet.
Pic: TER ShrinkFit collets
Instead of the usual slotted collet, the cutting tool is installed in a ShrinkCollet using a
ThermoGrip® machine, and then installed either into a standard collet chuck, a driven tool, or
directly into a machine spindle.

This technology guarantees even tension, distributed around the full circumference of the
cutting tool, resulting in a very high clamping-force, excellent torque-transmission, and very low
runout, and minimized vibration. Height-adjustment adaptors are available.
Pic: Live tool for lathe with TER ShrinkFit collet
All told, the Diebold ShrinkCollet will yield significantly better results than a standard ER collet
system. Data collected from end-users, notably in the medical industry, has indicated improved
ability to hold tolerances and maintain better finishes, particularly machining high-alloy
materials.

AllGrip - A Breakthrough in ThermoGrip® Technology
Pic: AllGrip Shrink collets and holders
Diebold’s newest offering, AllGrip Chucks, finally provides the industry with a means of easily
and safely shrinking cutting tools with a shank tolerance of h4 to h9. The AllGrips’s slotted
design offers constant maximum elasticity and smooth running characteristics.
AllGrip was introduced at AMB 2008 and won the MM Award for “Most innovative product in its
category”.
AllGrip requires a very low initial investment; all that is needed is a basic ThermoGrip® chuck
and the appropriate sleeves. AllGrip gives the user the flexibility to use cutting tools with
tolerances that couldn’t be considered with standard ShrinkFit chucks. This allows less
expensive tooling to be used, reducing cost. This is especially true when using cutting tools in
the 3 to 6 mm range.
Another advantage of the AllGrip system is the ability to use High-Speed Steel cutting tools.
Fast, easy tool-changes are the norm, even with this difficult material.
ThermoGrip®
For over 10 years, the ThermoGrip® Group has been the industries specialist in inductive heatshrinking.
Innovation and precision are the hallmarks of the ThermoGrip® Group.
At the METAV show in 1998, the ThermoGrip® Group introduced its patented inductive
shrinking process. Since then, there have been countless innovations, advancements and
further patents issued.
One such patented feature is our “Opening Cylinder”, which allows the user to set a cutting tool
into the nose of the toolholder before heating, aligns it, and guides it into place during the
shrinking process.
Another feature exclusive to the ThermoGrip® Group is our patented “Shielded Coil”. The
shielding on our coils reduces the exposure to the magnetic field for both the toolholder and the
user. This keeps the tool shank cooler, and virtually eliminates the dangers of exposure to highfrequency
magnetic fields inherent in many of these types of devices.

Company Profile
Diebold ThermoGrip® technology - from pioneers to high-tech leaders.
More than 10 years ago, Diebold introduced the first ContactShrink machine, a milestone in
ShrinkFit technology. Today, with over 10 different variants of inductive and conductive shrink
machines, we are the market leader.
In 2001, Diebold, Bilz, Marquart and Komet banded together to form the
ThermoGrip ® Group, to develop and market ThermoGrip ® ShrinkFit technology.
The ThermoGrip ® Group holds many patents on its innovative technology. In 2008, the
ThermoGrip ® Group acquired all the patents held by Marquart and founded an embedded legal
services department to oversee all of our patents.
The ThermoGrip ® Group is always striving to improve our technology and to expand the range
of products we offer to make your work more affordable and more rewarding.
Pic: Hermann Diebold, CEO
Pic: Diebold factory