CBJ Skills and Expertise 4

Question 1

A jeweler notices porosity in a cast piece that has been returned for polishing. What manufacturing stage most likely caused this defect?

Accepted Answer

Insufficient burnout time in the kiln causing gas entrapment during casting

Answer

Insufficient burnout leaves wax or binder residue that vaporizes during casting, trapping gas bubbles and causing porosity in the metal.

Question 2

Which type of saw blade is most appropriate for piercing an intricate filigree pattern in thin sheet metal?

Accepted Answer

A fine blade (size 4/0 or 6/0) for tight curves and detail

Answer

Fine saw blades (4/0 or 6/0) allow the jeweler to navigate tight curves and intricate details in filigree work without tearing the metal.

Question 3

When soldering a finding (such as a bail) onto a completed piece, which solder grade should be used?

Accepted Answer

A lower-temperature solder than that used in prior joins to protect existing seams

Answer

Using a lower-temperature solder for subsequent joins prevents the heat from re-flowing previously made solder connections.

Question 4

What is the function of a ring mandrel in bench jewelry work?

Accepted Answer

Measuring and shaping rings to a specific size

Answer

A ring mandrel provides a tapered, graduated form for sizing, rounding, and hammering rings to specific diameter measurements.

Question 5

In bead setting (grain setting), what tool is used to raise the small bead of metal that secures the stone?

Accepted Answer

A beading tool (cup bur)

Answer

A beading tool, also called a cup bur, is pressed onto the raised metal chip and rotated to form a smooth, round bead that holds the stone.

(CBJ) Certified Bench Jeweler Practice Test