11
© BTB Auto Glass & Body Shop Tools
2.2.10 Cutting from Outside Vehicle with a Powered
Cold Knife (PCK) Blade
2.2.10.1 GUIDELINES FOR USING
WK27 & WK28 POWERED
COLD KNIFE BLADES
First refer to
Diagrams X(3), Z
and
W
.
The most effective method for
using PCK blades with the E-Tool
is to push the blade in a forward motion. However, pulling the
blade is optional, allowing many more valuable benefits, refer
item h.
below.
a. Select the PCK blade best suited to the task.
i. The WK27 (blade tip facing left) and WK28 (blade tip
facing right) PCK blades are available in optional cutting
tip lengths, 'S' Short 19mm (¾"), 'M' Medium 25mm (1"),
'L' Long 30mm (1¼") and 'XL' Extra Long 45mm (1¾"). The
'L' blade has a taller profile servicing situations where the
vehicle A-pillar or pinchweld wall is excessively high.
ii.
YELLOW
WK27 and WK28 blades operate (in the same
manner as a manual cold / pull knife) from the outside
of exposed or bare edge glass and will hug and cut
adhesive against the internal side of glass surface.
They
can also be used from inside vehicle on selected
installations
(e.g. encapsulated glass) to cut against the
pinchweld.
iii. The
ORANGE
reverse PCK blades are also used from the
outside for removing undamaged encapsulated glass
but with flat side down, to cut against the pinchweld.
Refer to
Diagram A
(right diagram) on page
2
.
b. Apply protective tape to the vehicle paintwork if necessary.
c. Ensure that blade cutting edges are sharp at all times.
d. If required, cut any excess adhesive away from the glass
edge using a WK5 or WK5-S blade in manual handle.
e. Fit required length WK27 or WK28 blade into the power tool.
f.
Regularly spray cutting lubrication to the immediate
cutting area. Apply to both outside and inside of the
glass if possible.
g. Similar to a manual cold knife, identify an accessible entry
point for the blade and insert blade tip under the glass edge. If
necessary, turn power tool to low to assist entry under glass. If
it is difficult to enter the blade then use a standard blade (see
Diagrams E
and
N
) to cut a corner section from the inside, which
allows the glass to flex away slightly and for insertion of a PCK
blade. Do not apply excessive pressure or force to the blade.
h. Alternatively, the E-Tool's FIXED, fast, short reciprocal stroke
also allows the PCK blade to be entered/started at the
bottom of an 'A' pillar (below the guard or bonnet/hood) and
pulled
in a
backward
direction (up the 'A' pillar).
i. If the adhesive is extremely hard to cut or the glass edge is
too close to the pinchweld with possible risk of contact with
vehicle paintwork, it is recommended to use BTB’s internal
blade cutting method or a combination of both. Refer to
Diagram X (2)
2.2.10.2 CORRECT BLADE & TOOL ALIGNMENT FOR EFFICIENT
CUTTING USING PCK BLADES
Refer to
Diagram Z
.
a. Do not force or twist PCK blades. Align the power tool and
blade tip parallel to the glass, spray cutting lubrication and
steer the blade along the line of the glass edge. For best
results allow the reciprocating action of the power tool to do
the work whilst applying light pressure to steer the blade in
a forward or backward motion.
b. When cutting hard adhesive, regularly spray lubrication to
the cutting areas on outside and inside of glass if possible.
Powered
Cold Knife
Blade
WK27 tip
faces left
WK28 tip
faces right
L
R
WK27 tip
faces left
L
WK28 tip
faces right
R
c. If cutting wide adhesive bands, always use a short cutting
tip first (19mm), then a longer version (25mm or 30mm) to
complete the cut out.
Forward OR Backward
GLASS
GLASS
GLASS
GLASS
GLASS
Keep Blade at 90°
To Glass Surface
Always Operate Blade Parallel with Glass Edge
Incorrect Blade Angle May Cause Blade or Glass Breakage
Diagram Z
d. Do not force the blades. If the blade is not cutting:
i. Blade is not sharp or is being held at the wrong angle to
the glass, OR
ii. Adhesive is too wide, hard or close (see
Diagrams R, Y
).
Consider combining the cutting from inside with a
Standard blade and outside with a PCK blade as a
solution for difficult removals.
f. The WK27 and WK28 blades may also be used in the WK7 or
WK7L manual handles (supplied with toolkits) for use on soft
or small amounts of adhesives.
2.2.11 Pinchweld Trimming With No Damage to
Paintwork
BTB’s WK6 range of 'winged' pinchweld
scraper blades are for safely trimming
excess adhesive from pinchwelds and have
a special and distinct radius grind cutting
edge to the underside extending up the
vertical wing on each side, which avoids
any damage to painted pinchwelds. These
blades are normally used in the WK7 or WK7L manual handles but
can also be used in the power tool for heavier duty tasks such as
removal of body deadener, soundproofing or seam sealer. Use with
yellow label side facing upward. Refer to
Diagram ZA
.
0.5 or 1.0 mm of adhesive
will remain
for re-bonding
Pinchweld
Pinchweld
Adhesive
Trim Panel
Pull adhesive
away as shown
Wings protect painted
pinchweld wall and interior
trim, allowing adhesive to
steer blade
Underside radius on cutting edge
extends up vertical wings to avoid
scratching paintwork.
WK6-S
Cutting Tip Widths:
15mm
WK6-L
25mm
WK6-M
20mm
WK6-40 (Flat)
40mm
Diagram ZA
Pinchweld
Scraper
Blade
