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QUICK ACTING CLAMPS for Heavy-Duty Blocks 
& Accessories

QUICK ACTING CLAMPS  -- HDA 5.

Quick-Acting Clamps are used to combine miscellaneous Heavy Duty blocks and accessories
together at the end of a long combination of blocks.  The base of these clamps fit into holes in
the sides of blocks 1 inch and larger, and accessory items.   

1. WHEN USING QUICK-ACTING CLAMPS, THE COMBINATION OF GAGE BLOCKS AND
    ACCESSORIES MUST BE WRUNG TOGETHER BEFORE INSERTING THEM INTO THE
    CLAMPS.   
2. DO NOT RELY ON THE FORCE OF THE CLAMP TO SQUEEZE THE BLOCKS TOGETHER.
    THIS IS UNRELIABLE AND MAY RESULT IN INACCURATE MEASUREMENTS. 
3. IT IS IMPORTANT NOT TO OVER TIGHTEN THE SCREW.  NEVER USE PLIERS.
   OVER TIGHTENING CAN ALTER THE DIMENSIONS OF THE GAGE BLOCKS.  NEVER USE
   MORE PRESSURE THAN IS COMFORTABLE WITH THE THUMB AND INDEX FINGER.

The force of the clamp may compress the gage stack and change the length.  Because the
 amount of compression is unknown, the accuracy of measurement may be destroyed.   

An important advantage of Heavy Duty style blocks over rectangular and square blocks is that
 the blocks may be wrung together and then secured as the combination is being built.  For
 rectangular and square blocks, the entire combination must be built before  being inserted into
 the clamp or inserting the tie rods.   This makes building long combinations with Heavy Duty
 blocks far easier.  

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GB80