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Library > Casting > Casting Troubleshooting
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[961] Causes and Prevention of Defects in Wrought Alloys
Much of the recent literature on defects that occur in jewellery manufacture is focused on those occurring in lost wax investment casting. However, defects can also occur during casting of ingot and its fabrication into sheet, tube, wire and rod as well as their onward fabrication into jewellery components by processes such as stamping and forging. These defects, along with their causes and prevention, are briefly reviewed in this article, although those defects occurring in the die-striking of findings are described elsewhere in this issue.... (2002)
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Show me more articles from: [The World Gold Council]|[Mark F. Grimwade]
Releated Categories: [Jewelry Mass Production]|[Metallurgy]|[Casting Troubleshooting]


[653] Characterization and Correction of Casting Defects
Platinum casting defects are often very difficult to characterize due to the intrinsic complexity of the investment casting process. All defects will fall into one or more of the established seven categories of casting defects. The proper identification of a particular defect is the prerequisite to correcting and controlling the quality of platinum castings. It is contended that a system of defect identification should be based solely upon morphological criteria with no prior assumptions relating to the cause of the defect. The nature of a casting defect can only be determined by correctly categorizing the shape, appearance, location and dimensions of the defect. The importance of a controlled and comprehensive defect analysis program is advanced. Once appropriately classified, the possible causes can be examined and the corrective action can be taken..... (2005)
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Show me more articles from: [Platinum Guild International]|[Timothy L. Donohue and Dr. Helmut F. Frye, Ph.D.]
Releated Categories: [Platinum Casting]|[Casting Troubleshooting]


[201] Finding Flaws - Identifying and preventing wax defects
Manufacturer spend much time and money diagnosing defects that are believed to originate in the casting process, but actually occur during waxing. Many companies run in circles, changing this gate/sprue, that metal, these temperatures, and screaming at suppliers to try to fix the 'mystery' problem. While these areas certainly can be the source of problems, many defects are misdiagnosed as casting defects, and thousands, perhaps millions, of dollars are wasted in search of non-existent flaws in the casting process.... (2003)
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Show me more articles from: [MJSA Journal]|[J. Tyler Teague]
Releated Categories: [Casting Troubleshooting]|[Wax Working]|[Jewelry Mass Production]


[235] Five Steps for Successful Investing
A good practice for preventing investment blowout is to measure the height of the trees before investing. The maximum tree height should be between 0.5 inch and (for larger trees with more metal) 0.75 inch shorter than the fill level of the flask. It's also important to leave a 0.125 inch gap between the top of the investment and the top of the flask if you are using benchtop vacuum casting with a solid flask.... (2003)
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Show me more articles from: [MJSA Journal]|[Gregg Todd and Greg Gilman]
Releated Categories: [Lost Wax Casting]|[Casting Troubleshooting]


[1037] How Jewel-Craft discovered the root of a casting problem by going backward
A design riddled with undercuts and sharp little details just screams casting nightmare the moment the CAD file shows up. But sometimes even the most straightforward looking designs can cause real headaches for the caster. Take for example this three-stone palladium ring design that recently arrived at Jewel-Craft in Erlanger, Kentucky, for casting. It´s a bit unusual, particularly the center setting, which features eight prongs and a raised lip of metal where the stone sits. However, nothing about the design caused alarm.... (2012)
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Show me more articles from: [MJSA Journal]|[Tina Wojtkielo Snyder]
Releated Categories: [CAD/CAM]|[Casting Troubleshooting]


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