USE/CARE OF HANDTOOLS & MEASURING TOOLS - OD1621 - LESSON 2/TASK 1
Light tongs should not be used to handle heavy work,
since the heavy material may cause a bending or springing of the jaws. Keep
the jaws in line when handling work.
When handling hot metal, hold the
metal securely and keep the tongs away from your body.
Make certain all
joints are tight before use.
(1) Maintenance. When the serrations of plier jaws become damaged or
worn, or when the cutting edges become dulled or nicked, they must be
repaired. The jaw serrations must be either ground on a V-shaped wheel or
filed with a V-shaped or triangular shaped file.
(a) Grinding Serrations.
Separate the jaws of the pliers by
removing the nut and screw, if so designed, and place one plier jaw in a
grinding vise. Use a narrow grinding wheel that has an included angle of
60 (30 on each side of the centerline) (figure 38 on the following page)
and grind the serrations.
(b) Filing Serrations. Place the pliers in a vise protected with
soft jaws and file the serrations with a triangular shaped file.
SPECIAL PURPOSE PLIERS.