ROJEK CB 400/1 Operating instructions

Disc sanding machine CB 400_600_800 /- 1 (2)
ROJEK
WOODWORKING MACHINES Masarykova 16, 517 50 Častolovice
the Czech Republic - Europe [e-mail] www.rojek.eu
[phone] to - 41 fax -42 or -323 341; -322701
translation of the original
Service instructions handbook
updated 04 / 2016

ROJEK a.s. 2 CB 400_600_800/ -1(2)
CONTENTS
1. General
2. Safety at work
3. Technical data
4. Description and function
5. Installation
6. Operation
7. Maintenance
8. Troubleshooting
9. Storage
10. Guarantee
11. List of subcontractors.

ROJEK a.s. 3 CB 400_600_800/ -1(2)
1. GENERAL
1.1
Grinding machine identification Grinding machines are identified as follows:
ČB 600/2
Face grinding machine
Grinding wheel diameter
Number of grinding wheels
1.2 Application
Face grinding machines of following models: ČB 400/1(2), ČB 600/1(2) and ČB 800/1(2) are
designed for grinding of wood, aluminium alloys and all types of plastic. High-quality grounded surface,
accurate and quick adjustment of the table allows reducing the number of faulty products and raising the
labour productivity.
1.3 Used signs
Below you can find signs shown in the manual and placed on the machine. There is a short description
stated for each sign.
WARNING (black sign on the yellow background)
Refers to general hazards. A failure to comply with specified procedure may result in
personal injury or property damage
(Black sign on the yellow background)
Warns of high voltage
(Black sign on the white background plus red signal)
Prohibits using water for fire-fighting purposes.
(White sign on the blue background)
Refers to duty of operating personnel to shut down power supply before commencing
specific activities.
(Black sign on the yellow background)
Refers to duty of operating personnel to find out respective information in the manual
before commencing any activities using the machine.
(White sign on the blue background)
Instruction to wear goggles.

ROJEK a.s. 4 CB 400_600_800/ -1(2)
2. WORK SAFETY
This service manual contains some basic instruction that shall be observed at installation, operation and
maintenance of the face grinding machine.
Caution.
It is necessary that all competent personnel be thoroughly familiarized with
the text.
It is necessary to comply not only with above general safety instructions (mentioned in this section) but
even other specific safety instructions stated in other sections.
Safety instructions for operator and operating personnel.
WARNING
Never repair the grinding machine when in operation.
Protection covers over moving parts must not be uncovered when the
machine is in operation.
WARNING
Only competent and certified person may carry out any activities related to
the electrical equipment. Danger voltage.
WARNING
Never use water to extinguish fire near the switchboard.
WARNING
Special care shall be taken to prevent an unauthorized person from
switching on the driving motor of the grinding machine. Take out the plug
and lock the main switch.
DIRECTION
Always wear goggles when operating the grinding machine.
Safety instructions for maintenance and installation
WARNING
Operator shall ensure that competent and certified persons thoroughly
familiarized with the service manual carry out all maintenance, control and
installation activities.

ROJEK a.s. 5 CB 400_600_800/ -1(2)
3. TECHNICAL DATA
model CB 400/1(2) model CB 600/1(2) model CB 800/1(2)
machine length 550 (800) mm 640 (1100) mm 740(1300) mm
machine width 500 mm 700 mm 900 mm
machine height 700 mm 1285 mm 1385 mm
table dimensions 500 x 250 mm 700 x 300 mm 900 x 400 mm
height of the table 475 mm 900 mm 900 mm
grinding wheel diameter 400 mm 600 mm 800 mm
number of grinding wheels 1(2) 1 (2) 1(2)
grinding wheel rpm 910/ min 940/ min. 700/ min.
motor output 1,1 (1,5) kW 1,5 (2,2) kW 2,2 (3) kW
weight 45 (65) kg 110 (180) kg 180 (250) kg
environment AA4, AB4, AD1 AA4, AB4, AD1 AA4, AB4, AD1
Sound level at work place of the machine measured is 78,3 dB.
according to EN ISO 11202: 1997.
Following standards and regulations were used at construction of the machine:
EN 60204-1, EN 292-2, EN 294, EN 418, EN 953, EN 1050.
4. DESCRIPTION AND FUNCTION
The machine consists of the frame, table, and tilting device, grinding wheels, exhaustion and electric
equipment. The frame of the machine is covered with metal plate. Motor is fixed at upper section of the
frame. Exhaust pipe is situated inside the frame. Aluminium wheel, with following diameters: ø 400, 600
and 800 mm, is fastened to the flange with four M16 set screws. An emery cloth is bonded to the wheel.
Cast iron table is attached to the grinding machine on the swivel arm. Controls available are the motor
starter with a function of central STOP button and the mechanical brake.
Sending machine is equipped with an electronic brake. Machine operator must respect producer´s
instructions, mentioned at the machine. ATTENTION ! START AGAIN ONLY AFTER BRAKED
DISC STOPS !!!
In case of an electronic motor brake failure, it is possible to disconnect the brake from the electric circuit.
Only a skilled, qualified person is alowed to disconnect it !
Using an adjustable rod set up the table into the required angle and then uses the control wheel for fine
adjustment. The angle ruler (±60 degrees) is fixed to the cast iron table in the T groove. Special dust and
sawdust exhausters R 200 A or R 2000 may be connected to the exhaust pipe with the diameter of Ø 95
mm. This exhauster is not supplied with the machine.
WARNING
In the event of sand paper replacement or machine failure an authorized
person may uncover the upper cover of the grinding machine.
This may only be done when the grinding machine is not in operation!

ROJEK a.s. 6 CB 400_600_800/ -1(2)
5. INSTALLATION
The grinding machine models ČB 600/1(2) and ČB 800/1(2) shall be anchored to the ground using four
(4) M12 screws. Connection of the grinding machine is made via the cable CGSG 4C 1,5mm with the
16A, 400V plug. Socket shall be protected against overcurrent 3 16A.
After the initial connection the direction of rotation is to be checked. This shall be as indicated by an
arrow shown on upper side of the cover. In the event of contrariwise rotation the two-phase wires at
motor starter shall be interconnected.
WARNING
Only a competent person with electrotechnical qualification is allowed to
carry out these works.
6.OPERATION
- Trained persons may only operate face grinding machine.
- Always use a facial shield or goggles when operating the grinding machine.
- Use protective gloves and apron - depends on nature of works to be performed.
- Operator must not leave the machine until the wheel stops after turning off.
- When the work on the grinding machine is interrupted or completed, it is necessary to turn
the switch off.
- It is forbidden to repair malfunctions when the machine is in operation or the wheel is not
standing after turning the machine off.
Aluminium
wheel
Cast iron
table
Angle ruler
Tilting
device
Main
switch
Frame

ROJEK a.s. 7 CB 400_600_800/ -1(2)
7. MAINTENANCE
Once a month it is necessary to re-fasten motor starter clamps. Motor protection against overloading is set
up to the rated current of the motor by the manufacturer and it is forbidden to change this value. These
works may only be carried out by the person with appropriate electrotechnical qualification. Function and
effectiveness of the brake system needs to be checked on a regular basis. All maintenance works may
only be performed by certified and competent person after the machine is disconnected from mains.
8. ABRASIVE CLOTH REPLACEMENT
When you decide to replace the emery cloth, proceed as follows. Loosen upper cover and uncover it.
Loosen the M12 nut of the swivel arm and remove the table from the grinding machine. Pull the
aluminium wheel off the motor flange. Moisten the cloth bonded to the wheel (use water for this purpose)
and after about 2 hours remove the cloth from the wheel.
Clean the wheel up and remove the grease from the wheel using the C6000 diluter. Using a spatula
prepared for this purpose apply the layer (0,5 mm thick) of the DIVALEP FORTE adhesive. Stick the
cloth on. When sticking a special care must be taken to prevent from air bubbles remaining between the
cloth and the wheel. Cloth glued on in this manner is to be pressed and let to get dry (10 hrs). After then
cut the cloth off. Wheel contact-surface and flange contact-surface must be cleaned up. Mount the
grinding wheel on the motor flange. Tighten nuts gently. Put the table back into its position and adjust the
distance of the table from the wheel to 3 up to 5mm.
9. STORAGE
Grinding machines must be stored in dry premises where no great temperature changes occur.
Preservation shall be checked at least once a year at long-term storage.
10.GUARANTEE
Guarantee period and conditions are stated in the guarantee certificate.

ROJEK a.s. 8 CB 400_600_800/ -1(2)
11. Grinding machine WIRING DIAGRAM
Voltage system: 3x230V/400V AC 3P+N 50Hz AC 400V/TN-S
MODEL CB 400/1 CB 400/2 CB 600/1 CB 600/2 CB 800/1 CB 800/2
1,1kW 1,5kW 1,5kW 2,2kW 2,2kW 3kWM1 910 rpm 910 rpm 940 rpm 940 rpm 700 rpm 700 rpm
EP1 M4 EP1 M4 EP1 M4 EP1 M6,3 EP1 M10 EP1 M10MS
3,0A 3,9A 3,9A 5,2A 6,2A 7,7A
The grinding machine connected via the cable CGSG 4C x 1,5 mm² with the plug 16A, 400 V. On the
front side there is a motor starter: type EP1 M (4; 6,3; 10), which provides overcurrent protection and is
used to turn on/off the motor. Protection of this starter is IP55 and the starter is equipped with
undervoltage protection against unexpected start up of the grinding machine after outage. Interconnection
of the machine is realized by the cable CGSG 4C 1,5mm². Protective clamp of the motor starter is
connected via the wire CY 6mm² to the outside protective clamp of the machine frame.
address: ROJEK woodworking machines Masarykova 16 517 50 ČASTOLOVICE
Czech Republic + 420 494 339 138 up to /-42 fax [phone]
L1
L2
L3
N
PE
1
2
3
4
5
6
3~
Motorový spouštěč (MS)
typ EP1 M...
Motor M1
Vidlice 400V/16A
plug 400V/16A
motor start switch (MS) type EP1 M

ROJEK a.s. 9 CB 400_600_800/ -1(2)
angle ruler sanding disc exchange
table adjusting table tilting

ROJEK a.s. 10 CB 400_600_800/ -1(2)
CB 400 CB 800
table tilting