prohibits this, partially remove the rivet head by filing
apply the rivet pull tool in the usual manner to upset the
or with a rivet shaver. An alternative would be to file the
rivet.
pin flat, center punch the flat, and carefully drill out the
Because of the mechanical lock feature of the pin
tapered part of the pin forming the lock.
and sleeve, the driven rivet is substantially the
2. Pry the remainder of the locking collar out with
mechanical equivalent of a one-piece solid rivet.
a drift pin.
Inspection
3. Use the proper size drill to drill almost
completely through the rivet head. For a
Visual inspection of the seating of the pin in the
1/8-inch-diameter rivet, use a No. 31 drill; for a 5/32,
manufactured head is the most reliable means of
use a No. 24; and for a 3/16, use a No. 15.
inspection. If the proper grip length has been used and
the locking collar and broken end of the pin are
4. Break off the drilled head with a drift pin.
approximately flush with the manufactured head, the
5. Drive out the remainder of the rivet with a pin
rivet has been properly upset and the lock formed.
that has a diameter equal to or slightly less than the rivet
Insufficient grip length is indicated by the pin breaking
diameter.
below the surface of the manufactured head. Excessive
Q4-18.
What is the most commonly used layout fluid?
grip length is indicated by the pin breaking off well
above the manufactured head. In either case, the
Q4-19.
What is the only thing you should use a
locking collar might not be properly seated and an
scriber for when laying out aluminum or
unsatisfactory lock would be formed.
magnesium?
Q4-20.
The amount of material consumed in the
Removal
bending process is known by what term?
Removal of this rivet can be accomplished easily
Q4-21.
What is the outside dimension of the formed
and without damage to the work if you use the
part called?
following procedures. See figure 4-55.
Q4-22.
The setback is the combination of the metal
1. Shear the lock by driving out the pin with a
thickness and what other factor?
tapered steel drift pin not over 3/32-inch diameter at the
Q4-23.
Machines used to cut sheet metal are
small end. If you are working on thin material, back up
classified into what two groups?
the material while driving out the pin. If inaccessibility
Q4-24.
When using a vise and forming blocks to
manually form a part, what are the three
materials that the mallet you use must be
made from?
Q4-25.
When you cut sheet metal, how much should
you add to allow for trim?
Q4-26.
Before making any bends on the layout, what
should you do to make sure the brake settings
are right?
Q4-27.
How many adjustments must be checked on
the bar folder before you can properly bend
and fold metal?
Q4-28.
To form cylindrical or conical shapes, you
should use what machine?
Q4-29.
What machine should you use to make a
groove on a bucket?
Q4-30.
What determines the minimum rivet
Figure 4-55.--Removing self-plugging rivets (mechanical
diameter?
lock).
4-30
