KNECHT A400 User manual
Status 09.2023 Version 1.1 | Translation
Operating Instructions
Sharpening Machine
A 400
3
A400 Sharpening Machine
Manufacturer
KNECHT Maschinenbau GmbH
Witschwender Straße 26
88368 Bergatreute
Germany
Phone +49-7527-928-0
Fax +49-7527-928-32
www.knecht.eu
Documents for machine operator
Operating Instructions
Date of issue of the operating instructions
September 25, 2023
Copyright
These operating instructions as well as the operating documents remain the copyright property of KNECHT
Maschinenbau GmbH. They are supplied only to customers and operators of our products and belong to
the machine.
Without our express permission, these documents may neither be duplicated nor made accessible to third
parties, in particular competitor companies.
Operating Instructions
4
1. Important notes 7
1.1 Preface to the operating instructions 7
1.2 Warnings and symbols in the operating instructions 7
1.3 Warning and mandatory signs and their meaning 8
1.3.1 Warning and mandatory signs on the sharpening machine 8
1.3.2 General warning and mandatory signs 8
1.4 Rating plate and machine serial number 9
1.5 Figure and item numbers in the operating instructions 9
2. Safety 10
2.1 Basic safety instructions 10
2.1.1 Observe notes in the operating instructions 10
2.1.2 Obligation on the part of the operator 10
2.1.3 Obligation on the part of the personnel 10
2.1.4 Hazards involved in handling the sharpening machine 10
2.1.5 Malfunctions 11
2.2 Intended use 11
2.3 Warranty and liability 11
2.4 Safety regulations 12
2.4.1 Organizational measures 12
2.4.2 Protective equipment 12
2.4.3 Informal safety measures 12
2.4.4 Selection and qualification of personnel 12
2.4.5 Machine control system 13
2.4.6 Safety measures in normal operation 13
2.4.7 Hazards due to electrical power sources 13
2.4.8 Particular hazard areas 13
2.4.9 Servicing (maintenance, repair) and fault rectification 13
2.4.10 Structural alterations to the sharpening machine 14
2.4.11 Cleaning the sharpening machine 14
2.4.12 Lubricants/oils and greases 14
2.4.13 Relocation of the sharpening machine 14
3. Description 15
3.1 Intended use 15
3.2 Technical specifications 15
3.3 Functional description 16
3.3.1 Structure 16
3.4 Description of the assemblies 17
3.4.1 Angle gauge 18
3.4.2 Control panel 18
3.4.3 HV146 Truing Device 18
Table of Contents
5
4. Transport 19
4.1 Transport aids 19
4.2 Transport damage 19
4.3 Transport to another installation site 19
5. Installation 20
5.1 Selection of qualified personnel 20
5.2 Installation site 20
5.3 Supply connections 20
5.4 Settings 20
5.5 Initial start-up of the sharpening machine 21
6. Commissioning 22
7. Operation 24
7.1 General grinding fundamentals 24
7.2 Grinding with the copy grinding plate 25
7.2.1 Mounting the guide slide 25
7.2.2 Clamping the sickle-shaped knife on the copy grinding plate 26
7.2.3 Mounting the adjustment stop for the angle setting 27
7.2.4 Attaching the copy grinding plate with knife to the grinding table 27
7.2.5 Setting the grinding angle 29
7.3 Grinding sickle-shaped knives 32
7.4 Water tray 35
7.5 Dressing the grinding wheel/deburring wheel 36
7.5.1 Dressing the grinding wheels 38
7.5.2 Dressing the deburring wheel 39
7.5.3 Rounding the edges of the grinding wheels/deburring wheel 40
7.6 Changing the grinding wheels/deburring wheel 41
8. Care and maintenance 46
8.1 Cleaning 46
8.1.1 Cleaning agent and lubricant table 46
8.2 Maintenance plan (one-shift operation) 47
Table of Contents
7
1.1 Preface to the operating instructions
These operating instructions are intended to make it easy to learn how to use the A400
Sharpening Machine, hereafter referred to as the sharpening machine and to properly utilize its
features.
These operating instructions contain important notes on how to operate the sharpening machine
safely, properly and efficiently. Observing these instructions helps to avoid hazards, reduce repair
costs and downtimes and to increase the reliability and service life of the sharpening machine.
The operating instructions must always be stored in the location that the sharpening machine is
used.
The operating instructions must be read and applied by every person tasked with working with
the sharpening machine, e.g.:
• transport, installation, commissioning
• operation, including error rectification during operation, as well as
• servicing (maintenance, repair).
Recognized technical standards for safe and professional work must be observed in addition to
these operating instructions and the binding accident prevention regulations applicable in the
country of use and at the place of use.
1.2 Warnings and symbols in the operating instructions
The operating instructions use the following symbols/designations that must be followed:
The hazard triangle with the signal word “CAUTION” serves as a work
safety notice for all work for which there is a risk of personal injury or
death.
In these cases, work should be done with special attention and care.
ATTENTION “ATTENTION” is written in places where special attention must be paid
to prevent damage or destruction of the sharpening machine or its sur-
roundings.
NOTE “NOTICE” refers to user tips and especially useful informations.
1. Important notes
CAUTION
8
1.3 Warning and mandatory signs and their meaning
1.3.1 Warning and mandatory signs on the sharpening machine
The following warnings signs have been affixed on the sharpening machine:
CAUTION! RISK OF INJURY FROM ABRASIVE PARTICLES
(mandatory sign on the control panel)
Grinding, deburring and dressing gives rise to abrasive particles
which can enter the eyes.
Wearing eye protection is mandatory when carrying out such
work.
CAUTION! RISK OF INJURY FROM KNIFE!
(mandatory sign on the control panel)
Working with the sharpening machine involves grinding knives
that could cause serious cut injuries due to their sharpness.
Caution when transporting blades. Use the protective equipment
provided by the knife manufacturer. Protective gloves and safety
shoes must be worn.
1.3.2 General warning and mandatory signs
The following general warning signs must be observed:
CAUTION! DANGEROUS ELECTRICAL VOLTAGE!
The sharpening machine carries life-threatening voltage when
it is connected to the power supply.
Voltage-carrying parts of the machine may only be opened by
authorized personnel.
Before care, maintenance and repair work, the sharpening
machine must be disconnected from the power supply.
1. Important notes
9
1.4 Rating plate and machine serial number
The rating plate (1-1) is located on the left side of
the machine.
The machine serial number (1-2) is located on the
rating plate (1-1) and on the lower right side of
the grinding table.
1.5 Figure and item numbers in the operating instructions
If the text makes a reference to a machine component depicted in a figure, the figure and
position number will be given in brackets.
Example: (7-3/1) means picture number 7-3, position 1.
Place the sickle-shaped knife (7-3/1) with the knife protec-
tor on the corresponding copy grinding plate (7-3/2).
Tighten the clamping claws (7-3/3) with moderate force
using an AF 13 mm open-end wrench.
1. Important notes
Figure 1-1 Rating plate
Figure 1-2 Machine serial number
Figure 7-3 Clamping the sickle shaped knife on the
copy grinding plate
3
2 1
10
2.1 Basic safety instructions
2.1.1 Observe notes in the operating instructions
The basic prerequisite for the safe handling and uninterrupted operation of this sharpening
machine is knowledge of the basic safety instructions and regulations.
• These operating instructions contain important notes on how to operate the sharpening
machine safely.
• All persons carrying out work on the sharpening machine must follow these operating
instructions, in particular the safety notices.
• In addition, the rules and regulations regarding accident prevention at the place of use are to
be observed.
2.1.2 Obligation on the part of the operator
The operator is obliged to allow only those persons to work on the sharpening machine, who
• are familiar with the occupational safety and accident prevention regulations and have received
instruction in handling the sharpening machine,
• have read and understood the operating instructions, in particular the section entitled “Safety”
and the warning notes and have provided signed confirmation of this.
The safety-awareness of the personnel at work will be monitored at regular intervals.
2.1.3 Obligation on the part of the personnel
All personnel working on the sharpening machine shall be obliged, before starting work, to
• observe basic occupational safety and accident prevention regulations,
• read the operating instructions, particularly the section entitled “Safety” and the warning notes
and provide signed confirmation that they have understood them.
2.1.4 Hazards involved in handling the sharpening machine
The sharpening machine has been built to the latest technological standards and the recognized
rules of technical safety. In spite of this, its use poses inherent risks which could result in bodily
harm or even death of the user or third persons, or damage to the sharpening machine or other
property.
The sharpening machine may be used only:
• for its intended purpose
• in a safe and secure condition.
2. Safety
11
Malfunctions that may impair safety are to be eliminated immediately.
2.1.5 Malfunctions
If safety-relevant malfunctions occur with the sharpening machine, or if the processing behavior
indicates that such malfunctions may have occurred, the sharpening machine must be stopped
immediately and until such time as the malfunction has been found and eliminated.
Allow only authorized trained personnel to eliminate the malfunctions.
2.2 Intended use
The sharpening machine is exclusively suitable for sharpening sickle shaped knives up to a
maximum size of 1000 mm.
Any other use or use beyond this is not considered as intended. KNECHT Maschinenbau GmbH
is not liable for any damage resulting from this. The risk is borne solely by the user.
Intended use also includes observing all instructions in the operating manual.
ATTENTION Improper use of the sharpening machine
exists, for example, if:
• fixtures are not properly fastened.
• cutting tools other than those mentioned
above are sharpened.
2.3 Warranty and liability
Warranty and liability claims in case of personal injury or property damage are excluded if such
damage is attributable to one or more of the following causes:
• improper use of the sharpening machine,
• improper transport, commissioning, operation and maintenance of the sharpening machine,
• operating the sharpening machine with defective safety devices, or using improperly attached
or malfunctioning safety and protective equipment,
• failure to observe the instructions with regard to transportation, commissioning, operation,
maintenance and repair of the sharpening machine,
• unauthorized structural alterations to the sharpening machine,
• unauthorized modification, e.g. of the drive conditions (output and speed),
2. Safety
12
• failure to monitor machine parts that are subject to wear, and
• use of unapproved replacement and wear parts.
Use only original replacement and wear parts. If externally purchased parts are used, it is not
guaranteed that they have been designed and manufactured to meet the requirements in terms
of stress and safety.
2.4 Safety regulations
2.4.1 Organizational measures
Inspect all available safety devices regularly.
Observe prescribed intervals for recurring maintenance work or as specified in the operating
instructions!
2.4.2 Protective equipment
Before every commissioning of the sharpening machine, ensure that all protective equipment is
properly mounted and in functional condition.
Protective equipment may be removed only after the sharpening machine has stopped and has
been secured against accidental restart.
When attaching spare parts, the protective equipment must be attached by the operator as
stipulated.
2.4.3 Informal safety measures
The operating instructions must be permanently available at the place of use of the sharpening
machine. In addition to the operating instructions, the generally applicable as well as locally
relevant accident prevention regulations must also be made available and observed.
All safety alert symbols and hazard warnings on the sharpening machine must be complete and
clearly legible.
2.4.4 Selection and qualification of personnel
Only trained and instructed personnel may work on the sharpening machine. Observe the legally
permitted minimum age!
The responsibilities of personnel with respect to commissioning, operation, maintenance and
repair must be clearly specified.
Personnel still undergoing training or instruction may only work on the sharpening machine under
the permanent supervision of an experienced person!
2. Safety
13
2.4.5 Machine control system
Only trained and instructed personnel are permitted to switch on and operate the machine.
2.4.6 Safety measures in normal operation
Do not operate the machine in any unsafe manner. Only operate the sharpening machine if all
the safety devices are installed and fully functional.
At least once per shift (or per day), check the sharpening machine for externally visible damage
and proper functioning of the safety devices.
Immediately report any changes present (including those of the operating behavior) to the respon-
sible office or person. If necessary, immediately shut down the sharpening machine and secure it
against restart.
Before you switch on the sharpening machine, ensure that no one can be injured by the start-up
of the machine.
In the event of a malfunction, immediately stop the sharpening machine and secure it against
restart. Rectify malfunctions immediately.
2.4.7 Hazards due to electrical power sources
Work on electrical systems or operating materials may only be performed by a qualified
electrician, in accordance with electrical regulations.
Defects, such as damaged cables, cable connections, etc. must be immediately rectified by an
authorized specialist.
2.4.8 Particular hazard areas
In the area of the grinding wheels there is a hazard of pinching and of drawing in e.g. clothing,
fingers and hair. Suitable personal protective equipment must be worn.
2.4.9 Servicing (maintenance, repair) and fault rectification
Maintenance work is to be carried out on schedule by trained personnel. Inform operating
personnel before beginning repair work. Designate a supervisor responsible for this.
For all service work, the sharpening machine is to be disconnected from the current supply and
secured against accidental restart.
Remove power plug. Secure repair area as necessary.
After completing maintenance work and rectifying any faults, install all safety devices and verify
that they are fully functional.
2. Safety
14
2.4.10 Structural alterations to the sharpening machine
Do not make any changes, additions or conversions to the sharpening machine without the
approval of the manufacturer. This also applies to the installation and setup of safety devices.
Any conversion work requires the written permission from KNECHT Maschinenbau GmbH.
Immediately replace machine parts that are not in perfect condition.
Use only original replacement and wear parts. If externally purchased parts are used, it is not
guaranteed that they have been designed and manufactured to meet the requirements in terms
of stress and safety.
2.4.11 Cleaning the sharpening machine
Properly handle any cleaning agents and materials used and dispose of them in an environmentally-
friendly manner.
Dispose of the wear parts and replacement parts in a safe and environmentally-friendly manner.
2.4.12 Lubricants/ oils and greases
When using oils and greases, follow the safety regulations applicable to the product. Comply with
the special regulations for the food areas.
2.4.13 Relocation of the sharpening machine
Disconnect the sharpening machine from any external power supply, even in the event of a minor
change of location. Before restarting the sharpening machine, connect it properly to the power
supply.
For loading work, use only lifting equipment and load-bearing devices with sufficient lifting
capacity. Appoint a qualified instructor for the lifting operation.
No persons other than those designated for this work may be present in the loading and
installation area.
Only lift the sharpening machine properly with lifting gear as specified in the operating instruc-
tions. Only use a suitable transport vehicle with sufficient load-bearing capacity. Secure the load
reliably. Use suitable attachment points.
When restarting the machine, proceed only in accordance with the operating instructions.
2. Safety
15
3. Description
3.1 Intended use
The A400 Sharpening Machine is used to sharpen and deburr sickle-shaped knives up to a
maximum size of 1000 mm.
3.2 Technical specifications
Height ������������������������������������������������������������ approx. 1510 mm
Width ������������������������������������������������������������� approx. 1260 mm
Depth ��������������������������������������������������������������� approx. 790 mm
Space requirement (WxD) �������������������������������������� approx. 2200 x 1450 mm
Weight ���������������������������������������������������������������� approx. 67 kg
Power supply* ������������������������������������������������������������� 3x 400 V
Mains frequency* �������������������������������������������������������������� 50 Hz
Power output* ������������������������������������������������������������� 0.18 kW
Power consumption* �������������������������������������������������������� 0.18 kW
Current consumption* ��������������������������������������������������������� 0.48 A
Back-up fuse ������������������������������������������������������������������� 16 A
Idling noise** ������������������������������������������������������� approx. 68 dB (A)
Operating noise level (measured A-weighted emission ��������������������� approx. 71 dB (A)
sound pressure level at the workplace LpA**
Diameter of wet-grinding wheels ����������������������������������������������� 150 mm
Speed �������������������������������������������������������������������� 130 1/min
*) This information may change depending on the electrical current supply.
**) Two-digit sound emission value according to EN ISO 4871 (measurement uncertainty KpA. 3 dB (A)). Emission
sound pressure level according to EN ISO 11201. Sharpened was a sickle-shaped knife from Magurit company.
1510 mm
790 mm
1260 mm
1510 mm
790 mm
1260 mm
16
3. Description
3.3 Functional description
The A 400 Sharpening Machine is used to sharpen and deburr sickle-shaped knives up to a
maximum size of 1000 mm. The maximum bevel width is 5 mm.
For sharpening, the sickle-shaped knives are guided manually on a defined path along the grind-
ing wheels. The path is specified by the copy grinding plate and corresponds to the knife contour.
The grinding angle is continuously adjustable between 25° and 35°. The setting is made by means
of corresponding angle gauges.
3.3.1 Structure
The sharpening machine has a grinding unit with two grinding wheels and one deburring wheel.
The grinding wheels are located in the lower area, the deburring wheel in the upper area of the
grinding aggregate.
The grinding unit is driven by an electric motor. The power is transmitted to the grinding wheels
via a spur gear transmission.
Figure 3-1 Dimensions in mm
CoGCoG
17
3. Description
3.4 Description of the assemblies
1 Grinding table
2 Copy grinding plate
3 Sickle-shaped knife
4 Grinding unit
5 Main switch
6 Water tray
7 Hand wheel angle adjustment
8 Adjustable machine feet
Figure 3-2 General view of sharpening machine
7
8
1
2
4
5
6
3
18
3. Description
3.4.1 Angle gauge
1 Angle gauges
3.4.2 Control panel
1 Main switch
2 Water tray
3 Hand wheel for angle adjustment
3.4.3 HV146 Truing Device
The truing device is located on the rear side of
the machine.
To remove it, loosen the two knurled screws
(3-5/1) counterclockwise.
Figure 3-4 Control panel
Figure 3-5 HV146 Truing Device
Figure 3-3 Angle gauges
1
1 1
1 32
19
4. Transport
When transporting, observe the local applicable safety and accident
prevention regulations.
Only transport the sharpening machine with the machine feet facing
downwards.
CAUTION
4.1 Transport aids
For transporting and for setting up of the sharpening machine, only use adequately dimensioned
transport aids.
Note the machine’s center of gravity when transporting. The center of gravity (CoG) is shown in
figure 3-1.
4.2 Transport damage
If damage is detected after unloading, during acceptance of the delivery, immediately inform
KNECHT Maschinenbau GmbH and the forwarding agent. If necessary, an independent expert
must be called in immediately.
Remove packaging and fastening straps. Dispose of packaging in an environmentally friendly
manner.
4.3 Transport to another installation site
For transport to another installation site, ensure that the space requirements are fulfilled (see
Chapter 3.2).
A permissible electrical connection must be provided at the new installation site.
The sharpening machine must stand firmly and securely.
Work on the electrical unit is only to be carried out by an authorized
specialist. Observe the locally applicable safety and accident prevention
regulations.
CAUTION
20
5.1 Selection of qualified personnel
We recommend having installation work on the sharpening machine
carried out by the trained KNECHT personnel.
We are not liable for any damage resulting from improper installation.
CAUTION
5.2 Installation site
When determining the installation site, bear in mind the space required for installation as well as
maintenance and repair work on the sharpening machine (see Chapter 3.2).
5.3 Supply connections
The sharpening machine is provided ready to connect with the corresponding connection cable.
Ensure that the power supply is connected correctly.
If the connection is incorrect, the grinding wheels may rotate in the
opposite direction to the prescribed rotating direction. An incorrect
rotating direction can lead to serious injuries.
Observe the prescribed rotating direction, see Chapter 6.
CAUTION
5.4 Settings
KNECHT Maschinenbau GmbH will configure the various components as well as the electrical
system before delivery.
ATTENTION Unauthorized alterations to the preset
values are not permitted and can damage
the sharpening machine.
5. Installation
21
5.5 Initial start-up of the sharpening machine
Place the sharpening machine at the installation site on a level base.
Level out any floor unevenness by turning the machine feet. Align the machine using a spirit level.
Have the power supply installed on site by a qualified electrician.
Completely install and inspect the protective equipment before commissioning.
Have all protective equipment checked for proper functioning by
authorized trained personnel before commissioning the machine.
CAUTION
5. Installation
Table of contents
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