Pop rivets

Most modern electric cars in the 1960 to 1980 era were subject to fail, with their pop-riveted bodies and non-existent marketing. The Urba Sports Trimuter of 1981 was 3-wheeler with a pop-up canopy, needle nose and a top speed of 60 miles per hour that the owner would build from a set of 15 plans. 

These baffles are aluminum eyelets,about pop rivet size, which are packed into the rear chamber during assembly. Original factory specs called for 280 eyelets in the M-11 suppressor and 410 in the H-10 units. This number will vary due to eyelet size, sleeve outer diameter, etc. Pack baffle assembly as tight as possible. The completed unit should not rattle if packed correctly. 

Drill and pop rivet the tube. The row of rivets should begin about V from each end. 

Drill fuze body for safety pin pnertia type only) and install either an electric or inertia type detonator in the fuze body. Secure in place with shims, spacer blocks, epoxy etc. Install safety pin and retainer if one is to be used. Reassemble the fuze and body sections with both epojo and a pair of screws or pop rivets (holes B). Maintain proper alignment during reassembly to avoid a wobbly, inaccurate projectile. 

Mark a center line on the top rear of the 8 tube. Measure 5/8 down each side from the center line and mark the tube. Measure 1 from the rear of the tube and mark again,intersecting the first 2 lines. These two points are the location for the tube support screws They can be drilled and tapped for machine screws or simply drilled for self tapping screws or pop rivets. Be sure that whatever fasteners used do not extend through the collar into the barrel itself. This allows the collar/ tube assembly to be removed from the barrel by loosening the bottom screw only. 

When the pressure of a fluid inside a vessel exceeds the vessel s strength, it will fail by rupture. A slow rupture may occur by popping rivets or by opening a crack. If the rupture is rapid, the vessel can literally explode, generating metal fragments and a shock wave with blast effects as damaging as those of exploding bombs. Boiler explosions are often disastrous. 

Blind rivets, also known as pop rivets, are rivets which can be set when access is limited to one side of the assembly. However, they are also widely used where both sides of the assembly are accessible. 

Thin sheet material such as trunking is often joined using a pop riveter. Special rivets are used with a hand tool, as shown in Fig. 3.62. Where possible, the parts to be riveted should be clamped and drilled together with a clearance hole for the rivet. The stem of the rivet is pushed into the nose bush of the riveter until the alloy sleeve of the rivet is flush with the nose bush (a). The rivet is then placed in the hole and the handles squeezed together (b). The alloy sleeve is compressed and the rivet stem will break off when the rivet is set and the joint complete (c). 

Pop rivets. This is a hollow rivet pre-assembled onto a steel pin or mandrel. The mandrel is designed to fracture at a pre-determined point during the setting operation, when the parts being fastened have been drawn close together and the joint is tight. 

The heater box is made from 20 gauge h.r.s. sheet metal. It is made in sections and then riveted together with 1/8 pop rivets. You probably do not have a sheet metal brake so an alternative method of making the bends is with a sheet metal tool. The photo in figure 102 shows what a sheet metal tool looks like. It s really just a pair of vise grips with wide flat jaws. If you are careful and make the bends gradually you will end up with a professional looking bend. 

Assemble the sides and ends of the heater box as shown in figure 105. Drill holes for the 1/8" x 1/4 pop rivets in the approximate locations shown. Don t rivet the seams within 1" of the bottom because that would interfere with the installation of the top. 

Figure 107 Attaching the heater box tqj to the sides with 1/8" x 1/4"pop rivets.

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