Vacuum P
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Common Safety Instructions for Vacuum Pads
Warning
Before selecting or using PISCO products, read following instructions. Read the
detailed instruction for individual series as the instructions below.
1. Take safety measures in advance where a dropping work-piece can cause danger.
2. Make sure to install a vacuum pad holder securely. Looseness may cause trouble.
3. Pay special attention to the work conveyance by screwed vacuum pads, accompanied by
rotary movement. There is a possibility of troubles due to the looseness of screws from the
rotary movement.
4. There is a possibility of troubles due to the leakage of vacuum system, clogging, vacuum
pad abrasion, crack, deterioration, the galling of slider part in the holder and the looseness
in joints. Carry out maintenance inspection periodically.
5. When a work-piece is conveyed by a vacuum pad, consider the acceleration, impacts and
wind pressure. Otherwise, the work-piece may drop during conveyance.
Caution
1. Thoroughly read and understand the theoretical suction force in this catalog before
selecting diameter, Qty and suction place of vacuum pads. Select vacuum pads with
enough margin in suction force.
2. The product incorporating NBR as seal rubber material has a risk of malfunction caused
by ozone crack. Ozone exists in high concentrations in static elimination air, clean-room,
and near the high-voltage motors, etc. As a countermeasure, material change from NBR to
HNBR or FKM is necessary. Consult with PISCO for more information.
3. Select the material of vacuum pad in accordance with use environment and ease of use,
referring to “Vacuum Pad Selection Guide” .
4. Select the suitable pad shape (type) in accordance with a work-piece and its shape,
referring to “Vacuum Pad Selection Guide” .
5. Select spring-holder type when work-pieces have different heights or are weak against an
external force. Select the suitable holder type, referring to spring force and spring length in
the catalog.
6. Since spring-holder type has a sliding action, minimize the transverse load. Otherwise, the
life time of the holder can be reduced or malfunction of the holder can occur.
7. In replacing vacuum pads, check the structure of holders and pads in the catalog and
tighten the hexagonal-column of the holder with a proper tool, referring to the following
tightening torque.
●Table. Tightening torque
Vacuum pad holder
Standard
Small
Pad screw size
（㎜）
Tightening torque
（
N·m
）
M4×0.7
0.5 ~ 1.0
0.9 ~ 1.1
M6×1
2 ~ 2.7
M10×1.5
5 ~ 7
–
M20×2
9 ~ 10
–
8. In replacing the adapters of Soft / Soft Bellows Series, check the structure of holders, pad
and adapters and tighten the hexagonal-column of the holder with a proper tool, referring to
the following tightening torque.
●Table. Tightening torque
Pad screw size
（㎜）
Tightening torque
（
N·m
）
M4×0.7
0.7 ~ 0.8
M6×1
1.5 ~ 2.0