andy & Harman articles a complete ambit of karat gold alloys in abounding forms, including casting grain, strip, wire, tubing, circles and blanks. These alloys are connected to accommodated the best burdensome requirements, and are anxiously bogus so that compositions and characteristics do not alter from adjustment to order.
Full karat gold alloys
Handy % Harman’s abounding karat gold alloys are supplied in the afterward karat designations: 10, 14, 18 and 23%. Yellow colors are accessible in the aloft karat groups, while white, red and blooming golds are accessible in 10, 14 and 18 karats. Their accomplished gold agreeable ranges from about 41% to 99%.
Casting grain
Handy & Harman karat gold casting atom is bogus in karat designations of 10, 14 and 18. Their gold agreeable ranges from about 41% to 75%, and accomplished argent agreeable from 5 % to 35 %.
Strip
Handy & Harman’s karat gold band is supplied in a array alignment from .004" to .250," and widths of ?" to 6."
"Rolled square" and annular wire
Handy & Harman’s "rolled square" gold affairs are supplied in diameters alignment from .125" to .375." Annular affairs are accessible in diameters of .007" to .125."
Circles
Handy & Harman’s circles (discs) are accessible in diameters alignment from ½" to 6," and from .007" to .100" in thickness.
Blanks (rectangular)
Handy & Harman’s ellipsoidal blanks are supplied in a array alignment from .007" to .150," and from ½" to 6" in width.
Karat gold tubing
Karat gold tubing is acclimated in a advanced array of applications, including bells bands, bracelets, clasps, beads, flutes and bandage earrings. The bank array will alter from .070" to .005," depending aloft the accurate application. Outside bore has a ambit of 1 inch to .040," afresh depending aloft end use. Generally, four alloys are frequently acclimated in tubing; Yellow #2, Yellow #29, Yellow #515, and White #60. The Yellow #2 and #29 are accomplished general-purpose alloys. Yellow #515 is acclimated in attenuate bank applications, both for abridgement and to acquiesce best acerbity for a affection product. The canal industry has historically acclimated 9K, 10K, 14K and 18K red golds. Tubing, like all comminute products, is accessible in tempers alignment from Dead Soft to Hard as Drawn.
Ordering tubing
When acclimation tubing, the afterward advice charge be provided for alert and authentic commitment of materials.
l. Outside bore and tolerances.
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2. Inside diameter.
3. Bank array and tolerances.
4. Length, or by coil.
5. Temper.
Calculating weights
Handy & Harman has devised a simple blueprint that will acquiesce you to apperceive the weight of your tubing order: Outside bore x 3.1416 x bank array X breadth (inches) X body = weight in troy ounces.
Casting karat golds
Investment casting is an age-old art, about as age-old as the Metal Age itself, which began with the melting of chestnut in assorted genitalia of the Near East, in about 4000 BC. The aqueous chestnut was casting in open, multi-compartmented, re-usable molds. The aboriginal assembly of ovens, molds and crucibles adapted the accumulated abilities of clay- and metalworkers. These workers apparent that a wax archetypal anchored in adobe would aftermath a atrium back the adobe was broiled and acrimonious and the broiled wax ran out. The atrium could again be abounding with aqueous metal to accommodate a metal replica of the aboriginal wax model. This "lost wax" action has remained accepted for 6000 years, and has formed the base of avant-garde in- accoutrement casting, which sometimes uses anew developed materials, such as plastics, instead of wax.
Today, through the advances in the metallurgical sciences, the development of specialty alloys and adult casting equipment, the action is a science in its own right.
Compared to duke crafting or die striking, casting has the afterward advantages: greater abandon of design, college candor of reproduction (especially of accomplished details), adeptness to undercut, college strength, more good ascendancy of color, and lower assembly costs.
Investment casting can be acclimated for about all gold alloys and about every anatomy of gold adornment manufacture.
Successful casting involves three factors: 1) the able architecture of the article, 2) selecting the best adapted admixture and, 3) application the adapted casting technique.
The architect charge accede not alone the artful appearance and blush of the accomplished piece, but additionally how the commodity is to be made, so that the aqueous metal will ample the cast properly, and will air-conditioned with a minimum of porosity and stress.
