USE/CARE OF HANDTOOLS & MEASURING TOOLS - OD1621 - LESSON 2/TASK 1
(6) Clamps should be screwed up tight, but not so tight that the
pressure will spring the clamp.
(7) Use hand pressure to tighten clamps; never use wrenches or bars
(figure 45 on the previous page).
(8) Always use the right size clamp and observe clamps for signs of
undue strain when using them.
f. Care of Vises and Clamps.
Keep vises clean at all times.
They should be cleaned
and wiped with light oil after using.
Never strike a vise with a heavy
object and never hold large work in a small vise, since this practice will
cause the jaws to become sprung or will otherwise damage the vise. Keep the
jaws in good condition and oil the screws and the slide frequently. Never
oil the swivel base or swivel jaw joint; its holding power will be impaired.
When the vise is not in use, bring the jaws lightly together, or leave a
very small gap and leave the handle in a vertical position.
Keep the threads of C-clamps clean and free from
rust by oiling properly. The swivel head must kept clean, smooth, and grit
free. If the swivel head becomes damaged, replace it as follows: Pry open
the crimped portion of the head and remove the head from the ball end of the
screw (figure 46 on the following page). Replace with a new head and crimp
securely on the ball. Oil screw threads regularly. For short storage, oil
clamps with a light coat of engine oil and wipe them off before they are
hung on racks or pins, or carefully placed in a tool box. For long storage,
apply a rust preventive compound to the C-clamp.
(b) Hand Screw Clamp.
The screws of these clamps may break or
become damaged, the inserts may become worn, or the wooden jaws may split or
warp. When necessary to replace any of these parts, disassemble the clamp
(figure 47 on page 64).
Remove handles from screws by filing off peened
ends of attaching pins and drive out the pins. Turn both screws from the
inserts and remove the inserts from the jaws.
Replace damaged screws,
inserts, and handles.
Install inserts in jaws and turn the screws into
position in the two jaws.