Knuth KKS 250 User manual

WERKZEUGMASCHINEN Operating instructions
KKS 250 / 315 / 350 1/29
Operating
Instructions
Circular saw
KKS 250 Part No. 102129
KKS 315 Part No. 102133
KKS 350 Part No. 102135

WERKZEUGMASCHINEN Operating instructions
KKS 250 / 315 / 350 2/29
1MACHINE DESCRIPTION....................................................................................................................... 3
2SPECIFICATION ....................................................................................................................................... 5
3SECURITY INSTRUCTION ..................................................................................................................... 6
4INSTALLATION ........................................................................................................................................ 9
4.1 CONNECTIONS .................................................................................................................................... 10
4.2 CONTROL HANDGRIP........................................................................................................................... 10
5USE............................................................................................................................................................. 13
5.1 CONTROL DEVICES.............................................................................................................................. 14
5.2 NORMAL CUTTING /WORKING ............................................................................................................ 15
5.3 CUTTING OF MACHINE STOP................................................................................................................ 16
5.4 MITER CUT.......................................................................................................................................... 16
5.5 VICE UNIT........................................................................................................................................... 16
5.6 HEAD SIDE SHIFTING........................................................................................................................... 18
5.7 CLUTCH UNIT ADJUSTMENT ................................................................................................................ 19
5.8 SCREW GEARING ADJUSTMENT ........................................................................................................... 20
5.9 CUTTING BLADE REPLACEMENT.......................................................................................................... 21
6MAINTENANCE ...................................................................................................................................... 22
6.1 OIL CHANGE IN THE REDUCTION UNIT................................................................................................. 23
6.2 ELECTRIC SYSTEM .............................................................................................................................. 24
6.3 WIRING DIAGRAM............................................................................................................................... 25
7PARTS........................................................................................................................................................ 27
7.1 HEAD.................................................................................................................................................. 27
7.2 BASE................................................................................................................................................... 28
8SPARE ARTS............................................................................................................................................ 29

WERKZEUGMASCHINEN Operating instructions
KKS 250 / 315 / 350 3/29
1 Machine description
Fig. 1
1 Control handgrip 12 Bar holding arm
2 Micro switch 13 Quick clamping lever
3 Blade rotation arrow 14 Vice clamping lever
4 Protection guard 15 Machine base (optional)
5 Reduction unit oil drain plug
6 Cutting blade 16 Opening for the introduction of
emulsifiable liquid
7 Hosing for the control handgrip rod 17 Housing for bar stopping rod
8 Start push button 18 Cutting off machine base fastener
9 Oil filing cap in the reduction unit 19 Base floor fastener
10 Control switch 20 Identification plate
11 Vice handwheel 21 Connecting plug to the electric box

WERKZEUGMASCHINEN Operating instructions
KKS 250 / 315 / 350 4/29
The cutting of machine is supplied with:
- Diaphragm cooling pump
- Manual quick clamping vice with anti-burr device
- 45° left / right swivelling head and vice
- Rod with bar stopping
- Set of wrenches for the routine use and maintenance
- Maintenance and operating instructions

WERKZEUGMASCHINEN Operating instructions
KKS 250 / 315 / 350 5/29
2 Specification
Model KKS 250 KKS 315 KKS 350
max. saw blade dimension 250 mm 315 mm 350 mm
Motor 400V 2-speed 0,73 kW / 0,95 kW 1,3 kW / 1,9 kW 1,5 kW / 2,2 kW
Speed (rotation) 51,102 rpm 44, 88 rpm 40,80 rpm
Width of vice 120 160 mm 160
Weight 80 kg 155 kg 205 kg
Fig.2

WERKZEUGMASCHINEN Operating instructions
KKS 250 / 315 / 350 6/29
3 Security instruction
Operation manual
For your own security read the operation manual before starting the machine. The
operation manual should be kept in a secure place. You should know about how to
handle the machine, its limits and it’s specific dangers.
Keep your working place clean
Disorder on your working place will result in danger. Take care that your working
place is free from chips and dirt. Use only the right tools to clean your machine from
chips. Keep your working place free from obstacles.
Check if there are any damages at the machine
Before you start the machine check the function of the security equipment. Check the
function of all movable parts. All parts have to be mounted correctly. Damaged
security parts should be repaired or exchanged by the after sales service.
Take care about outer conditions
Don’t use the machine in dangerous areas. Take care, that electrical parts don’t get
humid or wet. Work only with a good illumination.
Don’t use electrical parts near flammable fluids or gas.
Protect yourself from electric shock
Don’t remove mechanical or electrical security parts. Check if all security parts are
mounted and adequately functioning.
Wear only suitable clothes
Don’t wear large clothes, wristwatches or jewels. For your own security wear always-
working shoes while working. If you have long hair always wear a hairnet. While
working with the machine you have to wear security glasses. If you work under dusty
conditions you have to wear a dust protection-breathing mask.
Keep incompetent persons away from the working area
Take care, that there are no persons in your working area witch could be exposed to
danger. Children and visitors should be kept in a secure distance to the working area.
Keep children away from the machine.
Don’t let other people touch the machine or the cable of the machine.
Make sure that only authorised persons can reach the workshop.

WERKZEUGMASCHINEN Operating instructions
KKS 250 / 315 / 350 7/29
Take care about the Power supply cable
Before connecting the power supply cable to the wall socket ensure that the machine
is switched off. Don’t use the cable to pull the plug out of the socket. Take care, that
there is no tensile force on the cable. Beware the power supply cable from heat, oil
and sharp edges.
Control the plug and the cable regular and in case of damage let it repair by the after
sales service. Please control also the extension cable. Never use the machine
without Protection Earth.
Unplug the machine
If you don’t use and while servicing the machine pull off the power supply plug. This
is necessary because the machine should not run unintentionally and to protect you
from electric shock.
Beware of unintentional run
Confirm that the main power switch is off while you plug in the power supply plug.
Be careful with your tools
Keep your tools sharp and clean to work well and secure. Follow the instructions for
tool exchange and servicing.
Don´ t forget tools inside the machine
Before starting makes sure that there are no tools inside the machine which could be
hurled out of the machine. Make sure, that there are no loosen parts witch could be
dangerous.
Take care about your hands
Make sure, that tools and work pieces are securely fastened. Use only the right tools
to clamp and to fasten tools and work pieces. This is more secure than to fasten the
work piece with the hand, and you have two hands to handle the machine.
Pay attention to your balance
Take care about the position of your feed. Never climb on the machine, because
dangerous injury may result from falling down or contacting moving parts.
Accessories and accessory parts
Only use accessories and the operation manual or the supplier specifies accessory
parts witch. The use of other accessories and accessory parts may result in
dangerous injury and damage the machine. Only use accessories and accessory
parts for the right tasks.

WERKZEUGMASCHINEN Operating instructions
KKS 250 / 315 / 350 8/29
Electrical parts
The electrical parts confirm to the determinations of electrical security.
Electric specialist to prevent accidents for the user may only do mending.
Cleaning solvent
Before you work with cleaning solvent you should read the instruction of the fluid, to
prevent accidents.
Leaving the machine
Never leave the machine while it is running.
Alcohol, medicaments, drugs
Never use the machine under influence of alcohol, medicaments or drugs
Danger of fire
Don’t use highly inflammable fluids.

WERKZEUGMASCHINEN Operating instructions
KKS 250 / 315 / 350 9/29
4 Installation
The machine is supplied ready to be used, without cutting blade and emulsifiable
liquid.
When closing the machine position it is convenient to consider:
- That it is free from any hindrances, in a non-damp area, sheltered from the
bad weather
- That it is provided with a good lighting;
- That ft la close to the main switch;
- That the room temperature is between 0° and 45°C.
To carry out the Installation, keep to the following Instruction:
- Screw an M16 threaded eyebolt (minimum capacity load 400 kg.) into the
control handgrip note (7 fig.1)
- Hook the machine by means of ropes and tie rods of suitable carrying capacity
Lifting and handling operations can be very dangerous, if not carefully carried out:
for this reason outsiders must be kept far from the installation area, which is to be
cleaned, cleared out and delimited; ascertain that the available equipment fits the
requirements and Is free of vices; do not handle suspended loads and keep a safety
distance; the loads, during their handling should not be lifted more than 20 cm from
the ground.
- By means of an especially intended crane or hoist lift the machine and place it
in its pre-determined area. Mark, on the ground, the two holes for the machine
fastening to the floor (19 fig. 1)
- Lift the machine again, and place it close by.
- Making use of a suitable drill carry out the two holes and introduce the relevant
- Position the machine and base in its seat and subsequently fasten the base by
means of the two relevant screws
Should the machine be supplied without base, it must be fastened, through the two
holes (18 fig. 1), on suitable frame, able to support the machine weight and any
possible unbalancing resulting from its use.
The manufacturing company decline any responsibility for possible damages caused
by wrong installations or by the use of unsuitable bases.

WERKZEUGMASCHINEN Operating instructions
KKS 250 / 315 / 350 10/29
4.1 Connections
Make sure that the mains voltage corresponds to the motor voltage, shown on the
identification plate (20 fig. 1). Connect the machine line cable to an electric board
provided with automatic main switch (magneto thermal type); the switch must be
earthed, as per the standards actually in force, and able to protect the machine from
overloads and short circuits.
Check that the cutting blade correctly turns, according to the direction shown by the
arrow on the blade protection guard. Make also sure the rotation direction of the
blade teeth is correct (Fig. 5).
From the accessory kit the machine is equipped with, take the control handgrip and
the rod with bar-stop and operate as follows:
4.2 Control handgrip
Screw the handgrip into the especially intended threaded hole on the machine head
(7 fig. 1). Insert the micro switch connection plug into the suitable socket on the
control electric box (21 fig.1).
Rod with bar-atop
Insert the threaded rod into its housing (17 fig.1)
Bar holding roll
Position the roll (12 fig.1) in the bar supporting arm.
Cooling liquid
The cooling liquid, consisting of water and emulsifiable oil (4 l.) must be poured into
the collecting tank (16 fig. 1). Dilute the emulsifiable oil according to the ratio the oil
maker company recommends. (Normally it is approx. 10% oil)
Make sure the quantity of cooling oil which comes out during the cutting operation is
enough. The blade must be generously lubricated.
Before starting the machine, carry out a general efficiency check and ascertain you
know where control devices are located and how they work.

WERKZEUGMASCHINEN Operating instructions
KKS 250 / 315 / 350 11/29
Hooking position for the machine lifting
Indications concerning 16 x 2 M thread

WERKZEUGMASCHINEN Operating instructions
KKS 250 / 315 / 350 12/29
Rotation direction of the cutting blade

WERKZEUGMASCHINEN Operating instructions
KKS 250 / 315 / 350 13/29
5 Use
The cutting off machine has been conceived and manufactured to cut full, open or
tubular section ferrous material only. Using it to cut other materials or to carry out
different machining which do not comply with the booklet Instructions la not only
wrong and forbidden, but also relieves the manufacturing company of any
responsibility, both direct and indirect.
Before plugging in, make sure the tension corresponds to the voltage shown on the
identification plat (20 fig. 1).

WERKZEUGMASCHINEN Operating instructions
KKS 250 / 315 / 350 14/29
5.1 Control devices
The machine equipped with the following devices
Fig. 6
1. Start push button. This push button is intended to power the machine.
When it is on, a pilot light warns that the machine is energized.
2. Speed commutator. The speed commutator is intended to select the
cutting blade rotation speed.
“0” Position The cutting blade does not rotate (even if the 4) push button on the
control handgrip is pressed.
“1” Position This is the lowest speed position (44 rpm). It is a suitable speed to cut
hard metal and full section bars.
“2” Position This is the highest speed position (88 rpm). Such speed is suitable to
cut profiles and low thickness tubes.
The speed commutator can be padlocked. Padlock it when the switch is
set to “0”, before carrying out any maintenance or repairing operations.
3. Handgrip with control push button (4). The control handgrip (the
operator must be present) is intended to lift or lower the head,
performing this way the cutting operation. This handgrip consists of a
tube, screwed into the machine head: on the tube end there is the
control handgrip with its push button. By pressing the (4) push button
the cutting blade rotation starts, while by realizing it, the rotation stops.
Furthermore, the handgrip is equipped with a protection device against
accidental starting.

WERKZEUGMASCHINEN Operating instructions
KKS 250 / 315 / 350 15/29
5.2 Normal cutting / working
After carrying out what has been previously described for the machine setting at
work, operate as follows:
- Place the material to be cut into vice and firmly clamp it.
- Press the start button (1 fig. 6). The pilot light warns that the machine is
energized.
- Select the required cutting speed on the commutator (2 fig. 6).
- The cutting off machine is now ready to cut. Grasp the control handgrip
(3 fig. 6) and, by pressing the push button (4 fig. 6), the cutting blade will start
to rotate.
Delicately lay the blade on the piece to be cut, in order to avoid the blade teeth
breaking, and carry out the cutting operation.
In quiescent position (head up), the protection guard entirely covers the cutting blade.
During the cutting operation the guard automatically opens, in protection to the head
descent; only the part which is strictly necessary for the machining is left uncovered.
Make sure the cooling emulsion comes out in a sufficient quantity during the cutting
operation. The cutting blade must be generously lubricated.
When the cut has been performed pull the head to its quiescent position and release
the control handgrip. The blade stops.
The machine is equipped with a 24 V tow tension electric system, provided with
minimum voltage device. Owing to this device, in case of blackout with a consequent
machine stopping, when the current is reset the cutting off machine does not start. To
go further with the working it is necessary to press the Start push button again
(1 Fig. 6). This way any risks of accidental restarting are eliminated.
During the normal running, should the cutting off machine stop, even if the switch has
not been set to "0", operate extremely carefully and try to find out the reason which
has caused the machine stop.
All the cutting preparing operations must be carried out when the machine is in
quiescent position and the cutting is not rotating.
Empty section bar cutting capacity
Angle round flat square
90° 105 mm 95 mm 160 x 70 mm
45°L 90 mm 80 mm 90 x 70 mm
45°R 80 mm 60 mm 60 x 80 mm
To cut full section bars, reduce the cutting capacity by approx. 30%

WERKZEUGMASCHINEN Operating instructions
KKS 250 / 315 / 350 16/29
5.3 Cutting of machine stop
To stop the blade rotation during the machining just releases the control handgrip
(3 fig. 6). The machine can be stopped by selecting the “0” position on the speed
commutator (2 fig. 6) too.
5.4 Miter cut
It is possible to carry out miter cuts (max. 45° both rightward and leftwards). Ease off
the vice clamping lever (14 fig. 1), placed on the cutting off machine base, rotate the
head according to the required angle and subsequently fix the above mentioned
clamping lever.
This operation is to be carried out when the machine is switched of and not
energized.
The clamping lever must be firmly fixed to avoid head moving during the cutting
operations.
5.5 Vice unit
The vice is provided with quick clamping, whose shifting is of approx. 4 mm.
Therefore, by means of the especially intended handwheel (11 fig. 1) position the
vice jaws up to a distance of 2 mm; clamp now the piece to be cut by means of the
quick clamping lever (13 fig. 1)
Before carrying out the cutting make sure the piece has been firmly clamped into the
vice, to avoid its moving while the operation is being performed.
Shifting forward the vice units is needed to perform the max. allowed cutting. To shift
it just release the clamping lever (14 fig. 1), shift the unit forward and subsequently
reclamp the above lever.
Do not position other pieces to be cut upon the vice unit if the vice unit if the vice is
already clamping one.

WERKZEUGMASCHINEN Operating instructions
KKS 250 / 315 / 350 17/29
Pedal controlled pneumatic vice (Option)
Fig. 7
Connect the compressed air pipe to the pedals and adjust the inlet pressure to 5 + 6
bar.
The shifting of the pneumatic vice is of 6 mm; by means of the special handwheel it is
necessary to position the vice at a distance of 3 + 4 mm from the piece to be cut,
otherwise it will not be clamped.
Open the air inlet cock, placed on the pedals (3 fig. 7).
The vice will open and close just operating on the above pedals.

WERKZEUGMASCHINEN Operating instructions
KKS 250 / 315 / 350 18/29
5.6 Head side shifting
Fig. 8
This machine version is provided with a support, allowing shifting sideway the whole
head unit, should it be necessary to perform particular cuttings (max. shifting 50 mm).
To carry out this operation just rotate the handwheel (1 fig. 8) counter clockwise to
have the head shifted; by means of a clockwise rotation the head reaches again its
starting position.
The above operation is useful to:
Perform longitudinal cuttings.
Modify the cutting length (max. 2 – 3 mm), when this has already been preset by
means of the bar stopping device.

WERKZEUGMASCHINEN Operating instructions
KKS 250 / 315 / 350 19/29
5.7 Clutch unit adjustment
Fig. 9
When the machine is supplied its clutch unit is perfectly adjusted. Anyway it is
possible that, as time goes by, a further adjustment is required.
To perform this operation just rotates by max. 1 turn the socket had screw (1 fig. 9)
clockwise to tighten the unit and counter clockwise to loosen it. The above mentioned
screw is placed in the middle of the blade blocking nut.
Do not unloose the screw by more than 4 + 5 turns, to avoid the unit slipping out from
its seat.
This operation is to be carried out when the machine head is quiescent and the
cutting blade is not rotating. Disconnect the machine.

WERKZEUGMASCHINEN Operating instructions
KKS 250 / 315 / 350 20/29
5.8 Screw gearing adjustment
This adjustment is to be carried out further to wearing of the described parts, to
reduce noise and vibrations.
It is possible to eliminate the screw gearing clearance, if necessary (too much
clearance), since the screw gearing is mounted on an eccentric bush. To carry out
this operation just:
- Loosen the screw and nut (2 fig. 9)
- Rotate the eccentric bush clockwise (3 + 4 m), beating by means of a
screwdriver on the special slit (3 fig. 9) on the bush.
It is advisable to perform the above operation only if there is too much clearance.
Should you have any doubt, do not hesitate to contact the manufacture.
This operation is to be carried out when the machine head is quiescent and the
cutting blade is not rotating. Disconnect the machine.