Tips:

Before beginning a new phase, try rigging a test piece or a component mock up.  Cardboard mock ups will conserve material and will help to obtain correct sizes and shapes.

Setting the first rivets of the day should be done on a test piece to ensure proper air pressure; tool adjustment; and operator currency.

Place masking tape on rivet sets to stabilise them while riveting. (renew frequently)

A rubber grommet placed over the rivet tail will compress components together ensuring a close joint as riveting progresses. Use where clamps or clecoes are impractical.




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Preparation:

Materials deburred on edges;

Holes laid out in correct locations, taking into account pitch and edge distance requirements

Holes centre-punched using a backing plate to avoid sheet distortion;

Parts assembled securely together and supported while being drilled with a sharpened bit of  the correct size. Holes drilled squarely tosurrounding surface.

Parts disassembled and holes deburred;

Holes dimpled or countersunk if accepting AN 426 Flush head rivets.

Parts reassembled and clecoed;

Selection of new AN rivets of correct diameter and length;

Assembly well secured  in a vice, a jig or on a workboard.




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Bucking bars are tools used to form bucktails (thehead formed during riveting operations) on rivets.They come in many different shapes and sizes, asshown in the following picture.

Bucking bars are normallymade from an alloy steel similar to tool steel. Theparticular shape to be used depends upon the locationand accessibility of the rivet to be driven. The size and weight of the bar depend on the size and alloy ofthe rivet to be driven. Under certain circumstances,and for specific rivet installations, specially designedbucking bars are manufactured locally. These barsare normally made from tool steel. The portion of thebar designed to come in contact with the rivet has apolished finish.This helps to prevent marring offormed bucktails. Bucking-bar faces must be keptsmooth and perfectly flat and the edges and cornersrounded.

NOTE: Never hold a bucking bar in a viseunless the vise jaws are equipped withprotective covers to prevent marring of thebucking bar.

A satisfactory rivet installation depends largelyon the condition of the bucking bar and your ability touse it.If possible, hold the bucking bar in such amanner that will allow the longest portion of the bar tobe in line with the rivet. You should hold the buckingbar lightly but firmly against the end of the rivet shankso as not to unseat the rivet head. The inertia of thistool provides the force that bucks (upsets) the rivetand forms a flat, headlike bucktail.




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Higher density reduces vibration and kick back while bucking. Take a cue from the pros and use what they use. We carry a full line of standard bars and can custom build bars to your specifications. All bars have smooth faces and rounded edges and corners for ease and safety in handling.

According to the investigation for different bucking bars of the same shape but different materials and mass characteristics, use of heavier but same sized tungsten bucking bars can reduce vibration transmission to the hand.

In a word, tungsten bucking bars are VERY useful for bucking rivets and will make your life much easier in the build process.




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Tungsten Heavy Alloy bucking bars are resulting in a bucking bar of the same weight but half the size. Bucking bars are used in rivet setting to upset the shank of the rivet. Tungsten Heavy Alloy bucking bars reduce the recoil when reflecting the impact back to the rivet shaft.

In normal use, bucking bars experience considerable stress. Bucking bars are designed to provide a heavy and hard surface to support the rivet when the rivet gun delivers its impulse force. If the metal alloy is too soft, the bucking bar will wear quickly or not provide the necessary assembly support. Alternatively, if the metal alloy is too hard and brittle, the bucking bar will fracture easily. Our tungsten metal alloys are designed especially for bucking bar applications.




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Prices for tungsten concentrates produced by mines and the intermediate tungsten powers made by the secondary processors are quoted in metric tonne units (mtu). An mtu is made up of 10kg of WO3, as contained within the particular material in question, concentrates or APT (this relationship conveniently lead to the fact that a 1% resource grade is equal to 1 mtu). The two materials for which prices are quoted widely and reported in mtu of WO3 are listed as following:

1.tungsten trioxide, WO3, (containing 79.3% tungsten metal), as the critical constituent in the minerals in mine concentrates

2.ammonium paratungstate, APT, the main secondary downstream product made from concentrates.

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Scheelite often occurs in tin-bearing veins and is always found in association with gold. Fine crystals have been obtained from Caldbeck Fells in Cumbria, Zinnwald/Cínovec and Elbogen in Bohemia, Guttannen in Switzerland elsewhere. At Trumbull in Connecticut and Kimpu-san in Japan large crystals of scheelite completely altered to wolframite have been found: people from Japan have been called “reinite.”

Scheelite was first described in 1781 for an occurrence in Mount Bispbergs klack, Dalarna, Sweden, and named for Carl Wilhelm Scheele. Because of its unusual heaviness, it had been given the name tungsten by the Swedes, meaning “heavy stone.” The name was later used to describe the metal, while the ore itself was given the name scheelite.


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Scheelite is a calcium tungstate mineral with the chemical formula CaWO4. It is an important ore of tungsten.Here are some descriptions about the Tungsten Scheelite.

Tungsten's crystals are in the tetragonal crystal system, appearing as dipyramidal pseudo-octahedra.There are some colors included,such as orange,yellow,brownish green and pinkish and colorless.Scheelite possesses distinct cleavage and its fracture may be subconchoidal to uneven. Its specific gravity is high at 5.9–6.1 and its hardness is low at 4.5–5.Aside from pseudo-octahedra, scheelite is thought to be columnar, granular, tabular or massive in its habit. Scheelite's refractive index  are both moderately high. These factors contribute to scheelite's high lustre and perceptible "fire", getting close to that of diamond.

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