ROHM RPP / RPP-A 2-jaw parallel gripper - Manual (Page 7)

Safety Precautions and Guidelines for Use
2-jaw parallel grippers
ID 1104573 Operating Manual RPP; RPP-A
Röhm GmbH, Dillingen Works Röhmstr. 6, 89407 Dillingen/Donau, GERMANY, Tel. (49)9071/508-0
Page 7 of 37
5. Strength of the workpiece to be clamped
In order to ensure reliable gripping of the workpiece with the applied load forces, the clamped material must be
strong enough to withstand the gripping force.
Non-metallic materials such as plastic or rubber, etc. may only be clamped after testing and under particular
observation!
6. Installation and adjustment work
During clamping or alignment movements, etc., short distances are travelled in short times, in some cases with high
forces.
The drive system provided for the gripper actuation must therefore always be switched off during installation and
adjustment work. If the clamping movements are essential during set-up mode, however, then for clamping strokes
longer than 4 mm
- A fixed or temporarily installed workpiece holder must be installed on the device, or
- An independently actuated holding device must be installed,
or
- A workpiece loading aid must be provided,
or
- The set-up operations must be performed in hydraulic, pneumatic or electric jog mode (corresponding control
must be possible!).
The type of this set-up aid depends fundamentally on the machine tool employed and may have to be procured
separately!
The machine owner must ensure that during the whole clamping process, any danger to persons from the
movements of the clamping means is ruled out. For this reason, either 2-hand controls for actuation of the clamping
movement or - even better - corresponding guards must be provided.
7. Tightening and replacement of bolts
If bolts are replaced or loosened, faulty replacement or tightening may result in dangers for persons and materials.
For this reason, the tightening torque recommended by the bolt manufacturer and corresponding to the bolt grade
must always be used for al mounting bolts unless expressly specified otherwise.
The following tightening torque table applies for all the standard sizes M5 - M24 for grades 8.8, 10.9 and 12.9:
Grade M5 M6 M8 M10 M12 M14 M16 M18 M20 M22 M24
8.8 5,5 9,5 23 46 80 130 190 270 380 510 670 Nm
10.9 8,1 13 33 65 110 180 270 380 530 720 960 Nm
12.9 9,5 16 39 78 140 220 330 450 640 860 1120 Nm
All figures in Nm
If replacing the original bolts, always use bolt grade 12.9 in case of doubt. The grade 12.9 must always be used for
the mounting bolts of clamping inserts, top jaws, fixed stops, cylinder covers and comparable elements.
All mounting bolts which due to their intended use have to be frequently loosened and tightened again (e.g. due to
tooling work) must be coated with lubricant (grease paste) every six months in the thread area and on the head
contact surface.