Bosch GNF 20 CA Professional Operating Instructions Manual page 10

3 609 929 A85.book Seite 4 Mittwoch, 15. März 2006 11:10 11
Product Features
The numbering of the product features refers to
the illustration of the power tool on the graphics
page.
1 Two-hole wrench for clamping nut
2 Release lock
3 Release button for the cutting unit
4 Cutting depth scale
5 Release button for the depth stop
6 Depth stop
7 Chaser rollers
8 Working-direction arrow
9 Spindle locking button
10 On/Off switch
11 Service indicator (GNF 35 CA)
12 Vacuum hose*
13 Vacuuming connection piece
14 Rip fence* (GNF 20 CA)
15 Guide bolt (GNF 20 CA)
16 Grinder spindle
17 Mounting flange
18 Diamond cutting disc*
19 Spacing disc
20 Clamping nut
21 Break-out tool
* Not all of the illustrated or described accessories are
included as standard delivery.
Information on Structures
Slots in load-carrying walls are subject to Part 1
of the German Industrial
No. 1053, or to country-specific regulations.
These regulations are to be observed under all
circumstances. Before beginning work, consult
the structural engineer, architect or construction
supervisor in charge.
The permitted slot depth and width depends on
the slot length, wall thickness and the used build-
ing material.
10 • 3 609 929 A85 • TMS • 13.03.06
Intended Use
With a firm support of the cutting guide, the ma-
chine is intended to cut or slot mainly mineral ma-
terials such as reinforced concrete, brickwork
and road surfaces without the use of water.
Changing the Tool
Before any work on the tool itself, pull the
power plug.
Wear protective gloves.
Use only diamond cutting discs suitable for dry
cutting of the material with an allowable speed
that is at least as high as the no-load speed of
the machine.
Swiveling Out the Cutting Unit
For tool change, the cutting unit must be swiveled
out completely.
Place the machine on a firm surface. Turn the re-
lease lock 2 leftward using the wrench end of the
two-hole wrench 1.
This releases the spring-loaded cutting
unit and immediately swivels it up-
wards.
Removing the Clamping Assembly
(see figure
With the spindle locking button 9, lock the grinder
spindle (only when the grinder spindle is at a
standstill!).
Loosen the clamping nut 20 using the two-pin
spanner 1 and unscrew it. Remove the spacer
discs 19 and the mounting flange and clean the
clamping parts.
Standard (DIN)
Determining the Slot Width
The slot width results from the amount of spacer
discs between the two diamond cutting discs 18
and the cutting width of the diamond cutting
discs.
The slot width is calculated as follows:
Slot width = Thickness of the spacer discs +
width of the diamond cutting discs (4 mm).
The allowable slot width is shown in the section
"Tool Specifications".
The machine may only be operated with one or
two diamond cutting discs.
English - 4
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