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5. BLADE CHANGING & ADJUSTMENTS
WARNING! BEFORE MAKING ANY ADJUSTMENTS, DISCONNECT SAW FROM POWER SUPPLY.
5.1.
All adjustments that relate to the smooth and safe running of the blade have been set at the factory. However, if you require to replace
a blade due to it being worn out or if you need to change to a blade with a different tooth size it will be necessary to readjust the saw.
5.2.
CHANGING & TENSIONING THE BLADE :
WARNING! Take care when handling saw blades, blade teeth are very sharp.
5.2.1. Raise the sawing arm to the vertical position and engage the support plate (see fig.2 - 18)
5.2.2. Open the blade back safety panel by removing the plastic headed thumb screw (58) and hinging it open as shown in fig.3.
5.2.3. Before the blade can be removed release the tension on the blade by turning the blade
tension knob (79) anticlockwise .
5.2.4. Remove the lower blade guide (69) and loosen the lowest screw on the upper blade
guide and slide the guide away from the blade to the end of its slotted mounting hole.
5.2.5. Ease the blade away from the lowest pulley wheel first and support it as you remove it
from the upper pulley wheel then carefully remove the blade from between the guides.
5.2.6. Place the new blade through the guides first and then ease it around the lower pulley
wheel. (Ensure that the tooth direction is consistent with the blade travelling left to right
in the cutting area.) Retain the blade on the lower pulley with one hand and take up the
tension at the top of the blade with the other hand. Then use both hands to ease the
blade over the upper pulley.
5.2.7. Begin to tension the blade by turning the knob (79) clockwise but as you do so make
sure that the back edge of the blade is seated against the rim of both pulleys. Check that
the blade is seating properly by turning the upper pulley by hand ( using the three
spokes of the wheel ) until you have observed a full rotation of the blade.
5.2.8. Once the blade is properly aligned increase the tension until the blade flexes by
approx.1mm when pressed at the midway point between the two pulleys.
5.2.9. Replace the lower blade guard (69) and move the upper blade guide back into its
position over the blade.
5.2.10. Close the blade protection safety cover and secure it with the plastic headed thumb
screw.
5.2.11. Reconnect the saw to the power source and run it for two to three minutes to seat the
blade.
5.2.12. Disconnect the saw from the mains. Open the blade back safety cover and recheck the
tension and adjust if required. Close safety cover.
5.3.
BLADE TRACKING ADJUSTMENT
Adjustment of the blade tracking is necessary to prevent the blade from twisting or
coming off the blade wheels.This adjustment should also be made whenever a new
blade is fitted (see section 5.2).
5.3.1. Run saw for a short time and then switch off.
5.3.2. Raise saw arm, open blade safety panel and check blade-to-wheel relationship.
Rear edge of blade should be very close to, but not hard against, the wheel flanges.
5.3.3. If inspection indicates that adjustment is required reduce blade tension (see para. 5.2.3.)
and loosen the blade tracking lock nut as seen in fig.4.
5.3.4. Place a 4mm hex tool into the adjuster and rotate in or out as required whilst rotating the
upper pulley by hand (using the three spokes of the wheel ) until tracking appears
corrected. Re-tighten the blade tracking lock nut.
5.3.5. Having made a small adjustment, tension blade, replace blade cover, lower arm and
run saw for a short time.
5.3.6. Switch saw off, remove blade cover and check tracking. Repeat adjustment procedure if
necessary.
5.4.
BLADE GUIDE BEARING ADJUSTMENT
Correct guide bearing adjustment is important so that the blade runs smoothly and
evenly without twisting or snagging anywhere along its path. Each of the outer guide
bearings is mounted on an adjustable eccentric bushing.
5.4.1. Disconnect the machine from the power supply.
5.4.2. Loosen the lock nut while holding the bearing bolt with an open ended spanner.
(See fig.5)
5.4.3. Turn the bolt to adjust the bearing. The bearing should barely touch the blade
(0.001"). This clearance can be measured with a piece of thin paper which should
just fit into the gap between the bearings and the blade. Tighten the lock nut when
satisfied with the bearing adjustment.
5.4.4. Adjust both outer guide bearings. When satisfied that the adjustment is accurate,
carefully turn the blade wheels by hand to see if the blade snags or rubs at any point.
Readjust bearing(s) if necessary.
5.5.
BLADE GUIDE ADJUSTMENT
5.5.1. Disconnect the machine from the power supply. ( Figure 6 shows the blade guard 69
removed for clarity. It is not necessary to remove the blade guard to make the following
adjustments.)
5.5.2. To adjust the blade guide loosen the bolt indicated in fig.6. and allow the single bearing
which runs on the back of the blade to rest on the blade without exerting any pressure.
5.5.3. Rotate the blade guide (as shown in fig.6 ) until blade is perpendicular to machine bed.
5.5.4. Retighten the hex bolt ensuring that no pressure is applied to the back of the blade.
Adjust the second blade guide in the same manner.
Original Language Version
BLADE TRACKING
LOCK NUT
ADJUSTER
fig.4
fig.6
SM5.V3
Issue: 4 - 25/03/10
fig.3
fig.5
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