Pilous 20875-0204, Instruction Manual

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5.5. Saw Blade Guide
The saw blade is guided before and after the cut in two guide heads provi-
ded with bearings, which enable winding the saw blade more easily
towards the guide on the moving wheels and the carbide guides on either
side and the upper edge of the saw blade. The right guide head is mounted
on the fixed guide bar. Both the guide bars in the ARG 500 are moving
guide bars. The left guide head is on the moving bar, moving within 5 - 10
mm from the workpiece. The guide bars are provided with saw blade pro-
tective enclosures as far as the machining zone. There is no saw blade pro-
tective enclosure in the machining zone.
5.6. Saw Blade Replacement, Tensioning and Setting
A timely replacement of the saw blade is necessary for achieving a good
cutting performance, the surface quality and the correct workpiece dimen-
sions. Blunt saw blades cause high consumption of electrical power, scarf
cuts and rough cutting surfaces. One of the decisive factors affecting the
quality of the cut and the life of the cutting tool is the correct and suffici-
ent saw blade tension.
Saw blade guide
inspection hole
Saw blade limit switch
Approx 0,5-3 mm
WRONG
SAW BLADE GUIDING
CORRECT
SAW BLADE GUIDING
Tension grip
Belleville washers
Idler Idler setting screw
SAW BLADE
TENSIONING
SAW BLADE
RELEASING
TIGHTEN SCREW RELEASE SCREW
Carry out these operations only when the saw blade is released!
Note: These operations may only be carried out when
the master switch is off and secured against restarting
or when the machine is isolated from the network. Warning: Danger of
injury by the sharp saw blade teeth. Use protective gloves. Do not
touch the guiding wheels and the saw blade.
The TOTAL STOP button is unlocked. Switch the MODE switch over to
M. Switch the SAW HEAD END ASCENDING SWITCH to 0 position.
Switch on the MASTER SWITCH, depress the HYDRAULIC UNIT -
START switch. Shut off the control valve (see chapter 5.2.) and using the
hydraulic unit, raise the saw head to the upper position (see chapter 5.3.).
Press the START button. Lower the saw head approx. 20 mm above the
fixed gripping jaw and arrest it in this position with the CONTROL
VALVE. Switch off the master switch or isolate the machine from supply
and secure it against restarting. Release the arresting lever of the saw head
end ascending so that the limit switch remains switched on and secure it.
Remove the saw head guards. Releasing the tension grip, release the idler
and thus the whole saw blade. Remove the saw blade from the moving
wheels and push it off the guide heads (see chapter 5.7.). Insert the new saw
blade in the guide heads. Put it on the moving wheels and tighten with the
tension grip.
Tighten the tension grip so that the Beleville washers are
pressed completely (no light appears) and the saw blade limit switch is
switched on! In this way, the correct saw blade tension is achieved!
Close the guards, switch on the master switch or connect the machine to
the network. Switch on the hydraulic unit, change over to manual mode
and the minimum saw blade speed. Using the Saw Blade START button,
switch on the saw blade and let it turn approximately once through. Make
sure that the saw blade fits correctly in the guide heads. Restart the saw
blade and let it turn approximately once through. Switch off the master
switch or isolate the machine from supply and secure it against restarting.
Remove the guards to make sure that the saw blade is correctly fitted in the
guide heads and correctly installed on the moving wheels (see figure). If
the saw blade is not correctly fitted on the moving wheels, release the ten-
sion grip and adjust the wheel setting with the screw (see figure).
Tighten
the tension grip so that the Belleville washers are pressed completely
(no light appears) and the saw blade limit switch switches!
Close the
band saw head guards and switch on the hydraulic unit. Make a saw blade
test run. Switch off the master switch or isolate the machine from the sup-
ply, open the band saw head guards and check if the saw blade fits on the
moving wheels. Repeat the whole procedure, if required. For casual check-
ing of blade position can be used SAWBLADE GUIDE INSEPCTION
HOLE. Close the band saw head guard, switch on the master switch and
the hydraulic unit. Carry out the first cut.
5.7. Guide Heads Setting
The correct setting of the bearings and the carbide saw blade guides in the
guide heads substantially influences the saw blade life and the quality of
the cut. The eccentrically arranged guide head bearings must be set in such
a manner that the saw blade surface is parallel to the carbide plate surfaces
and the clearance between these plates and the saw blade is minimal.