Tru-stone Blue River Agate

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avbill

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Joined
Oct 18, 2007
Messages
1,973
Location
San Bruno, CA, USA.
I turned a blue river agate try-stone two years ago. It made a beautiful electra rollerball pen.

I'm preparing for major show next weekend and going through all my pens. I noticed a irregularity on the surface of the pen I can take my figure nail ad go across the pen lengthwise and feel unevenness. further inspections showed small [tiny] hairline cracks underneath the surface of the Blue-River Agate.

I'm glad I never sold the pen. BUT

Has anyone ever seen this happen before with tru-stone ?
 
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PTsideshow

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Joined
Dec 26, 2011
Messages
1,033
Location
Macomb County Michigan
Can't speak to the problem from experience with tru stone but you may have the results of different expansion rates of the assorted materials. You have a thin layer of resin, the stone material, coloring should pigment should be minimal, glue also should be minimal, the brass tube inside the material. Plus any and repeated heat/cold cycles that the pen may have been exposed to. Sitting in a car hot and cold, the same for the shop.
The material may be turned to thin to be stable? Can't really say but some ideas to think about.
All materials have "Coefficient Of Expansion" and move at differing rates.
:clown:
 

aerosupra

Member
Joined
Feb 27, 2012
Messages
65
Location
Manassas, VA
I cracked tru-stone once when assembling the components...Pressed it together too hard I guess...I also dropped a blank onto my concrete floor and it split in two...

Those are my only negative experiences with tru-stone
 

plantman

Member
Joined
Jan 2, 2012
Messages
3,437
Location
Green Bay, Wi
Can't speak to the problem from experience with tru stone but you may have the results of different expansion rates of the assorted materials. You have a thin layer of resin, the stone material, coloring should pigment should be minimal, glue also should be minimal, the brass tube inside the material. Plus any and repeated heat/cold cycles that the pen may have been exposed to. Sitting in a car hot and cold, the same for the shop.
The material may be turned to thin to be stable? Can't really say but some ideas to think about.
All materials have "Coefficient Of Expansion" and move at differing rates.
:clown:
:eek::eek: PT: I thing you are right on with the diffrent materials expanding in the change in temps. Most metals expand and contract, stone dosn't. Jim S
 
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