Advertisement
Available languages
Available languages
i
The purpose of the back-stop discs is the alignment of workpieces on the vacuum
plate.
1. Undo the knurled nut.
2. Rotate the back-stop disc until it projects above the edge of the vacuum plate.
3. Tighten the knurled nut.
7.
Operation
7.1.
CLAMPING A WORKPIECE
CAUTION
Risk of injury due to a loose workpiece
Workpieces that come loose from the vacuum plate can cause injuries.
»
Maintain a constant operating vacuum of at least 70%.
»
Use the vacuum indicator to monitor the operating vacuum whilst the workpiece
is being machined.
»
Machining forces must be less than the restraining forces.
»
If the workpiece is subjected to higher forces, restrain it using back-stop discs.
»
Arrange the back-stop discs to counteract the machining forces or feed move-
ments.
B
C
,
i
Lay the sealing cord into the grid of the vacuum plate to match the workpiece con-
tour and prevent loss of vacuum.
NOTICE! Moisten the hands to lay the sealing cord.
ü There must be no burrs or unevennesses on the contact face of the workpiece.
Fault
Operating vacuum not achieved or is too
low, and the compressed air unit is running
Vacuum plate changed over to vacuum
connection: Operating vacuum not
achieved or is too low, and the vacuum
pump is running
The clamping face of the vacuum plate is
damaged
The restraining force is insufficient to ma-
chine the workpiece
10. Cleaning
Clean with a cloth or compressed air.
Do not use any corrosive cleaning agent.
11. Storage
Store in an enclosed dry room.
Do not store close to corrosive or aggressive chemical substances, solvents, moisture
or dirt.
Protect against direct sunlight.
Store at temperatures between +15° C and +35 °C.
Relative atmospheric humidity max. 60%
12. Spare parts
Use only original spare parts and wearing parts.
Use only a Ø 4 mm sealing cord.
13. Disposal
Comply with the national and regional environmental protection and disposal regu-
lations for correct disposal or recycling. Segregate items into metals, non-metals,
composite materials and consumables and dispose of them responsibly.
14. Technical data
Article no. / type
Weight
Length
Width
Height
Grid
Possible cause
Leaky compressed air hoses
Dirt between the workpiece and vacuum
plate
Seal defective or not fitted
Kink in the compressed air hoses
Shut-off valve not fully turned on.
Leaky vacuum hoses
Dirt between the workpiece and vacuum
plate
Seal defective or not fitted
Kink in the vacuum hoses
Defective machining of the workpiece
Clamping area is too small
Diameter of the vacuum hoses too small, or
vacuum hoses too long
Power of the vacuum pump insufficient
384900 / VR1
5 kg
300 mm
200 mm
32.5 mm
12.5 mm
ü Contact area between the vacuum plate and workpiece cleaned.
1. Cut the sealing cord to suit the size of the workpiece.
2. Insert the sealing cord into the recesses of the grid face, following the dimen-
sions of the workpiece (1).
NOTICE! The bore for pulling vacuum must lie within the area enclosed by
the sealing cord.
3. Insert the sealing cord, butting the ends against each other. Do not compress the
sealing cord or stretch it.
4. Place the workpiece on the sealing cord. If necessary, align the back-stop discs
(2).
5. Switch on the vacuum and clamp the workpiece.
»
The optimum operating pressure for the Venturi vacuum pump is 3.5 bar.
»
At 70% vacuum, the red indicator pin on the vacuum indicator is fully retrac-
ted.
6. Check that the workpiece is securely seated. The red indicator pin on the vacuum
indicator must not be visible.
»
The workpiece is now clamped.
7.2.
REMOVING THE WORKPIECE
1. Before removal of the workpiece, clean the vacuum plate under vacuum using an
industrial vacuum cleaner.
2. After cleaning away all debris and chips, switch off the operating vacuum.
3. Remove the workpiece.
8.
Maintenance
The vacuum plate is maintenance-free.
9.
Faults and troubleshooting
Action
Exchange the compressed air hoses
Clean the faces of the workpiece and va-
cuum plate
Change the seal
Align the compressed air hoses correctly
Turn the shut-off valve fully on
Change the vacuum hoses
Clean the faces of the workpiece and va-
cuum plate
Change the seal
Align the vacuum hoses correctly
Check the machining program
Increase the clamping area
Use additional restraints for workpiece
Increase the diameter of the vacuum hoses,
or reduce the length of the vacuum hoses
Increase the power of the vacuum pump
Article no. / type
Operating medium
Permissible operating pressure
Nominal operating pressure
Operating pressure for maximum vacuum
Maximum vacuum
Ambient temperature
Operating medium temperature
When using the Venturi vacuum pump:
Compressed air hose
or hose coupling adaptor
For an external vacuum connection:
Coupling adaptor for vacuum hose
Performed by
Trained specialist for mechanical work
Trained person
Trained specialist for mechanical work
Trained person
Trained specialist for mechanical work
Trained specialist for mechanical work
384900 / VR1
Compressed air to ISO
8573-1:2010 [7:4:4]
not oiled
1.0 bar – 8.0 bar
6.0 bar
3.5 bar
92% (approx. 80 mbar at stand-
ard pressure)
0 °C - 60 °C
0 °C - 60 °C
Ø 10 mm
7.2 mm
Ø 13 mm
www.hoffmann-group.com
de
en
cs
da
es
fi
fr
hr
hu
it
lt
nl
pl
pt
ro
ru
sl
sv
9
Advertisement
