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Articles by Charles Lewton-Brain

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[243] How jewelers approach working with their material?

This diagram shows how jewelers approach working in the field in terms of how they relate to the material. The approaches chosen will 'filter' the results available, that is that what kind of work you do is partly a reflection of the way you approach working with the material. Traditionally much jewelry has been 'cut and bend'. This diagram allows you to examine how you approach working with metal and then perhaps gives you clues about where you might want to experiment so as to push yourself.... (2003)

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Show me more articles from: [Brain Press Publications]|[Charles Lewton-Brain]

Releated Categories:[Critical Notes]

[54] How to step-roll wire

One requires a taper on the end of the wire to grip it with when placed through a drawplate for drawing. One may obtain this taper in several ways.... (1999)

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Show me more articles from: [Brain Press Publications]|[Charles Lewton-Brain]

Releated Categories:[Bench Tips & Tricks]|[Wire Working]

[11] How you move, sit and stand: Ergonomics

Many craftspeople have posture and body position problems. Ramazzini, the founder of occupational medicine and author of a groundbreaking book on diseases of workers published in 1713 writes rather cruelly (and the man was a great humanitarian in his time) about the effects of working posture and position in regard to cobblers and tailors.... (2000)

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Show me more articles from: [Brain Press Publications]|[Charles Lewton-Brain]

Releated Categories:[Workshop Safety]|[Beginner's Corner]|[Bench Tips & Tricks]

[731] Hydraulic Press Use Safety Notes

Goldsmiths began to use hydraulic presses in small shops in the 1940s in North America. Factories have used hydraulic presses for making blanking out parts and forming pieces for some time, and presses in the 150 to 200 ton range are not unusual in jewelry factories today. These need good machine guarding, maintenance and training for the operators. The smaller shop at the end of the 20th century tends to use slowly operated hydraulic presses in the 12 to 25 ton range for forming operations and some minor blanking, this last often carried out using R.T. or pancake cutting dies. It is the smaller presses I will discuss here... (1999)

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Show me more articles from: [The Jewelry Workshop Safety Report]|[Charles Lewton-Brain]

Releated Categories:[Workshop Safety]

ISBN: 0969851049

[96] Introductory Gemmology - Definitions Concerning Physical Properties of Gemstones

A perfect crystal is bounded by plane faces which meet at angles specific for each kind of material (angle analysis can identify minerals). A crystal may be cleaved in directions related to the external form or to a possible crystal form for the mineral. Sometimes two distinct minerals can have the same chemical composition with their differing properties being due to their different crystal structure. Crystal structure affects mineral properties.... (1997)

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Show me more articles from: [Brain Press Publications]|[Charles Lewton-Brain]

Releated Categories:[Gemology]

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