Category Faceting

TILT LIMITS FOR WINDOWING

By Jim Perkins (with Bruce Harding)
Copyright 2010

I am often asked how to choose good angles for faceting. Some of the answers were published in 19751 and are now available on the Internet at the address provided in the footnote.  One subject is ‘windowing’, which means that light passes directly through the gem without internal reflections; generally when the table is tilted from ‘normal’ (perpendicular) to a line from the viewer’s eye.

This was discussed in the subject article2, which provides charts for common materials. Each of these lists pavilion slopes across the bottom, and the maximum angle of tilt without windowing is listed across the top. Since nothing else matters in the subject of windowing, these data can be listed simply as below:

tilt1

Note that quartz with 43° pavilion mains...

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Splash Guards for FACETRONS

North Coast Lapidary has no vested interest in these. However, we have them on our FACETRONS and we love them. Many of our students have asked where to get them so here is the source:

SPLASH GUARD FOR FACETRONS AVAILABLE FROM:

TERRY F. GUMP
814 CAPITAL STREET
SPENCER, W.VA. 25276

PHONE: 304-927-1143

E-MAIL: terry.f.gump@gmail.com

PRICE: $24.95 + SHIPPING

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Why I recomend FACETRON faceting machines.

For those interested I have written the primary reasons I prefer the FACETRON faceting machine over all others as I am often asked that question. I am also asked if there are any other machines I recommend. The answer to that question is NO. I have owned many different makes of faceting machines through the years. I have given each at least one year of use before I dismissed it. Most of them were good machines but not good enough to remain in my shop. After trying all the rest I returned to what I felt was the best, FACETRON. Unless anyone else has owned them all they simply aren’t experienced enough to know what I know is all I am saying...

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