Woods-powr-grip MRTA8HV11DC User Manual download pdf (Page 12)

Rev 10.0/9-13 10 MRTA8-DC: #35076

INTENDED USE

LOAD CHARACTERISTICS

WARNING: This lifter is NOT intended for lifting hazardous materials, such as

explosives or radioactive substances.

The operator must verify that the lifter is intended to handle each load, in accordance with the

following requirements:

• The load must not exceed the maximum allowable weight specified under Load Capacity (see

SPECIFICATIONS).

• The load must be a single piece of nonporous or semiporous material with a flat and relatively

smooth contact surface.

To determine whether the load is too porous or rough, perform the

test under Vacuum Level on Other Surfaces (see OPERATION: TO APPLY THE PADS TO A LOAD).

• The load's contact surface must be suitable for obtaining a friction coefficient of 1 with the

lifter's vacuum pads (see MAINTENANCE: VACUUM PAD MAINTENANCE: Friction Coefficient), as

verified by a friction test. If necessary, contact Wood's Powr-Grip for help in conducting a

friction test.

• In order to avoid damaging the vacuum pads, the load's surface temperature must not exceed

the allowable Operating Temperatures (see SPECIFICATIONS). However, if such an

application cannot be avoided, Wood's Powr-Grip does offer a heat-resistant rubber

compound and other solutions which may enable you to lift loads with higher surface

temperatures. Contact Wood’s Powr-Grip or an authorized dealer for more information.

• While the

minimum

length and width of the load are determined by the Pad Spread (see

SPECIFICATIONS), the

maximum

length and width are determined by the allowable

overhang, or the amount of load material that can extend sideways beyond the vacuum pads

without breaking or otherwise being damaged.

The allowable overhang depends on the kind of load material being lifted, the thickness of the

material, and the angle at which it is handled (if any). Since materials such as glass, stone or

sheet metal each have different physical properties, the allowable overhang must be

evaluated separately for each type of load. If necessary, contact Wood’s Powr-Grip or an

authorized dealer for help in determining the recommended overhang in a specific situation.

• In order to maintain load stability in the upright position, the maximum allowable thickness of

loads is 1½" [3.8 cm] at the maximum weight (see SPECIFICATIONS: Load Capacity).

This

allowance assumes that the load is centered correctly on the lifter's pad frame (see

OPERATION: TO APPLY THE PADS TO A LOAD: Positioning the Lifter on the Load) and that no

other forces, such as wind pressure, are at work on the load. Either of these circumstances

could reduce the allowable load thickness.

Lifters that feature concave vacuum pads can also attach to some kinds of curved loads. Since curvature affects the lifting

capacity, contact Wood’s Powr-Grip for help in determining the Load Capacity for a particular curved load.

This allowance does not account for the use of Pad Spacers (option CM3PE2).

WARNING: Pad Spacers can reduce load

stability in the upright position and, in some cases, the allowable thickness of loads.

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Woods-powr-grip MRTA8HV11DC User Manual Page 12

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