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Lapidary / Gemstone Community Forum
February 21, 2019, 04:50:50 pm
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Bruce Bars?

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Author Topic: Bruce Bars?  (Read 357 times)
vitzitziltecpatl
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« on: November 22, 2015, 08:31:26 am »

Anyone here ever use Bruce Bars? Would like to hear about what made them useful - or not - compared to other abrasive applications before diamond was widely available.
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lithicbeads
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« Reply #1 on: November 22, 2015, 10:10:43 am »

 Any relation to Nanaimo bars? They are great.
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James D. Farrow
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« Reply #2 on: November 22, 2015, 10:35:26 am »

Did a search in Google and found this:

http://www.gemologyonline.com/Forum/phpBB2/viewtopic.php?f=8&t=19863

Other than that, just patent listings for the company that made them.

James
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James D. Farrow
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lithicbeads
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« Reply #3 on: November 22, 2015, 10:51:43 am »

Bruce Bars were essentially an easy to apply polish or grit. The 1000 grit bruce bar was a good step for problem carvings that did not undercut and could stand the heat of a felt buff. The felt 1000grit bruce bar- felt  combination would often put a great prepolish on difficult stone. Bars such as the cerium or aluminum oxides could be applied to heavy acetate to make an easily recharged faceting polish lap. Diamond seems to have supplanted them which surely has cut down on creativity in solving lapidary polish problems.
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stonemon
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« Reply #4 on: November 22, 2015, 02:08:57 pm »

I remember using Bruce bars in the '70s when I was cabbing...
Dipped the bar in water and held it to the felt wheel on the end of my LU6X as I recall.
Seemed to work fine and produce some quality results.
Have not seen one in 40 years!
Bill 
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vitzitziltecpatl
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« Reply #5 on: November 22, 2015, 08:20:57 pm »

Thanks to all who chipped in here. Am more unfamiliar with Nanaimo bars than with Bruce bars, so samples might be in order... . At least I've seen a Bruce bar.

We got three 100 grits, a 220, a 400, and a 1000 in an old lapidary stash we bought a few years ago. Had no idea they were ever available in anything other that Silicon Carbide.

Thanks so much for the link to the other thread. Robin got a faceting head for her machine from Gearloose. That was a great thread. Now know where to get modern "Bruce" bars.
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lithicbeads
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« Reply #6 on: November 23, 2015, 06:12:48 am »

Nanaimo bars are a candy confection but Nanaimo is close to the heart of many west coast rockhounds for other reasons. The area is host to deposits of truly excellent chrysanthemum stone. I was fishing with the Nanaimo mention hoping that some B.C. rockhounds would chime in but they seem to be rare on any of the forums.
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vitzitziltecpatl
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« Reply #7 on: November 23, 2015, 06:53:18 am »

Yeah, I can only remember a handful of rockhounds from anywhere in Canada on the forums. There is one transplanted Texan up there somewhere... .
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