notching machine refurbishment


// Quality Products

notching machine refurbishment

Our retrofit solu­tions make it possible to moder­nise ageing systems effi­ci­ently and cost-effectively.


We offer custo­mised solu­tions for every moder­ni­sa­tion task.


Toge­ther with the customer, we develop stra­te­gies that are perfectly tail­ored to the produc­tion requi­re­ments and available resources to ensure maximum effi­ci­ency for the customer.


Our machines are moder­nised exclu­si­vely in Germany.
As a reliable partner, custo­mers in the stam­ping and forming tech­no­logy sector can rely on us for retrofitting.










// Advan­tages are obvious

Notching machine refurbishment

Control and automation

Updating control systems enables more precise and effi­cient processes. The imple­men­ta­tion of auto­ma­tion tech­no­lo­gies can increase produc­ti­vity and improve user-friendliness.


Mate­rial supply and removal
Impro­ving mate­rial supply and removal systems can help to make the produc­tion process smoother and more efficient.


Quality control
The imple­men­ta­tion of modern quality assu­rance systems, such as image proces­sing tech­no­lo­gies and special sensor tech­no­logy, can monitor and ensure the quality of the stamped parts


Spare parts management
Updating obso­lete compon­ents and swit­ching to more modern elec­tronic compon­ents in elec­trical engi­nee­ring can play an important role in the moder­ni­sa­tion of groo­ving presses. This is parti­cu­larly important if the old compon­ents are no longer available or are diffi­cult to procure. New elec­trical compon­ents are gene­rally not only more effi­cient, but also available on the market for many years.


Sound insu­la­tion
Noise protec­tion is an inte­gral part of our die-cutting moder­ni­sa­tion solu­tions. Our sound­pro­ofing booths can be flexibly confi­gured as stand-alone systems or as part of a fully auto­mated produc­tion line, allo­wing us to signi­fi­cantly mini­mise noise pollution.

Martin Hagel 
Head of Automation 
+49 751 56082 – 0 
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// Appli­ca­tion example

notching machine refurbishment

Slot cutter MW Retrofit

Compre­hen­sive over­haul and moder­ni­sa­tion of the exis­ting NN20 groo­ving machine.



General project scope


  • Repla­ce­ment of wearing parts and repair work
  • Impro­ving machine effi­ci­ency and precision through targeted modernisation.
  • Renewal of critical compon­ents to increase the service life and perfor­mance of the groo­ving press.
  • Inte­gra­tion of measures to ensure opera­ting safety and compli­ance with industry standards.
  • Conver­sion to modern control and auto­ma­tion tech­no­lo­gies for optimum process control and efficiency.
  • Adapt­a­tion of the groo­ving press to chan­ging produc­tion requi­re­ments and materials.
  • Compre­hen­sive project support from plan­ning to commissioning.


Tappet and drive
The slide guide rails were replaced to restore the punching accu­racy. In addi­tion, the slide guide compon­ents were assem­bled and adjusted for optimum precision and parallelism.


Wear parts
The pulley and V‑belt were replaced and the bearings over­hauled. The flywheel shaft was replaced to ensure smooth operation.


Revi­sion of the rotary table
A blank clamp was retro­fitted to enable punching without a blank holder.


Main drive Siemens 1PH8
A new main drive from Siemens was inte­grated. At the same time, the servo unit for the pitch circle adjus­t­ment was replaced.


Clutch/brake combi­na­tion Service work
The wearing compon­ents of the clutch/brake combi­na­tion were replaced to ensure safety and performance.


The control systems and elec­tro­nics were compre­hen­si­vely modernised.
Advanced control tech­no­lo­gies have been inte­grated to improve process moni­to­ring and efficiency.

// Picture gallery

Retrofit up close

Here you will find pictures and videos from instal­la­tion to use by the end customer.

Let us inspire you and convince you of our exper­tise and experience.

// Hagel Automation

Latest news

Transfer system in press

Transfer system for a 5 metre press table

DEZ 2023 | We have built a transfer for a customer in the Czech Repu­blic. The transfer system was inte­grated into a press which has a 5m press table. The control of the transfer was planned, installed and commis­sioned by us 

Rendering Tandem slot cutter

Slotting centre 1400mm

DEZ 2023 | For a customer in Germany, we are curr­ently manu­fac­tu­ring a slot­ting centre that includes two single slot­ting machines connected in series. The system is equipped with two 200KN groo­ving centres. The entire project includes two comple­tely inde­pen­dent slot punching auto­ma­tions Centre 1 can punch a sheet diameter of 1400mm Centre 2 can punch a sheet diameter of 1000mm 

Feeder in press line

Feeder between C‑frame presses

JAN 2022 | Teles­copic feeder successfully installed between C‑frame presses in the auto­mo­tive sector in Germany. 

Tandem grooving machine installed at a customer's premises

Tandem grooving machine installed

DEC 2021 | We have installed a tandem groo­ving press for a customer in the Czech Repu­blic, which can be used in single or tandem opera­tion. Two 160KN groo­ving punches are installed in the system.

Press system with automation

Press system with automation

NOV 2021 | We have installed a 300 tonne press for a customer in the auto­mo­tive sector in Germany. The auto­ma­tion sequence of the system includes: Blank loader, gripper feed & transfer. 

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Hagel Automation in figures



Employees at the Grün­kraut site


Transfer systems installed


Years of experience
location map

// FAQ

Questions and answers

How long does a tool change on a grooving press take?

Normally, a tool change on a groo­ving press takes less than 10 minutes.

What does a groove punch do?

A groo­ving press produces rotor and stator lami­na­tions for elec­tric motors and gene­ra­tors using the single groo­ving process.
The stamped metal sheets are assem­bled into packages and then wound or moulded and assem­bled into a motor or generator.

Which parts are mainly produced on grooving presses?

Slot punches are used to manu­fac­ture elec­trical lami­na­tions (stators and rotors) for elec­tric motors.

How does a groove punching machine work?

A single groove is punched into a circular sheet using a punching tool.
The sheet is then fed through a feed device (divi­ding head) by one divi­sion – the punching process is repeated.
Depen­ding on the pitch, between 30 and 100 punching opera­tions are carried out per sheet until the finished sheet is produced. This takes place at a stroke rate of 600 to 1200 punching opera­tions per minute.

What are the advantages of a groove punch?

The produc­tion of sheet metal using the single groo­ving process is consider­ably cheaper and more flexible compared to a mould with a complete cut.

How fast is a groove punch like this?

As a rule, the groo­ving press is operated at 600 to 1200 strokes per minute. This depends on the size and comple­xity of the component.

How many tonnes can a grooving machine punch?

We curr­ently offer groo­ving punches in a range of 5 – 20 tonnes punching force.

Why a Hagel Automation grooving machine? 

Slot punching at the highest level and maximum precision and output. The patented design of the groo­ving press enables high rigi­dity and optimum condi­tions for good auto­ma­tion.
Thanks to the drive tech­no­logy used, there are no more wearing parts on the groo­ving press.

Modernise or replace old grooving presses?

We offer custo­mised solu­tions for the mecha­nical and elec­trical moder­ni­sa­tion of old groo­ving presses. In addi­tion, exis­ting groo­ving presses can be retro­fitted with our auto­ma­tion concepts.

How large is the output of a grooving machine?

Depen­ding on the size and degree of auto­ma­tion, the output of our systems is between four and ten sheets per minute.

What is the delivery time for a groove punch?

It usually takes around 10 months from orde­ring to deli­very of a groo­ving machine. We often have a demons­tra­tion machine in-house that is available at short notice.

How easy is it to maintain a grooving machine?

The groo­ving machine has a modular design and is very easy to main­tain, as the groo­ving machine no longer has any wearing parts.

Who supplies grooving presses and builds the automation for them?

Hagel Auto­ma­tion specia­lises in the design and cons­truc­tion of slot­ting machines and the entire auto­ma­tion process. Hagel Auto­ma­tion supplies effi­cient, modern and highly precise slot­ting machines.

What does a groove punch cost?

The costs depend on the required punching force, the equip­ment and the degree of auto­ma­tion of the groo­ving press. We are able to prepare a quota­tion for any appli­ca­tion at short notice.

How heavy is a groove punch?

Approx. 4000 to 7000 kg.

What are the areas of application of a grooving machine?

Produc­tion of elec­trical sheets for motors and gene­ra­tors for wind power, hydro­power and drive technology.

How does the single grooving process work with grooving punches?

A single groove is punched into a circular sheet using a punching tool.
The sheet is then fed through a feed device (divi­ding head) by one divi­sion – the punching process is repeated.
Depen­ding on the pitch, between 30 and 100 punching opera­tions are carried out per sheet until the finished sheet is produced. This takes place at a stroke rate of 600 to 1200 punching opera­tions per minute.

What sheet diameters are possible on a grooving press?

Curr­ently, sheet metal with a diameter of 35 mm to 1300 mm is processed on groo­ving machines. The current trend is towards larger diame­ters of up to 1800 mm.

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