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Post by knave on Aug 20, 2020 20:42:45 GMT -5
What is the advantage of using the cardboard between the rocks? On a smaller piece, it seems like it could sag a little bit.
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Post by woodman on Aug 21, 2020 9:04:20 GMT -5
the cardboard gives a place to saw the piece off and I think the glue penetrates and holds better with it. real small pieces I think one could use paper. i don';t think just gluing two rocks togeether without it would work with superglue, but then what do I know. the thin single layer of cardboard worked great with the brazilian agate.
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Fossilman
Cave Dweller 
Member since January 2009
Posts: 20,723 
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Post by Fossilman on Aug 21, 2020 10:27:07 GMT -5
I'm doing Montana moss agate on boards as we speak... Started out with 14, now down to four... I use Elmer's carpenter glue.. Cut my slabs, throw the boards in a bucket of water, let them do their thing, go check the bucket out in a week or so and it's xmas all over again.... Hahahaha
Scrape the boards, let them dry out for future use....
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Post by opalpyrexia on Aug 21, 2020 11:19:59 GMT -5
I had a small piece of Blue Mountain rough about 2x2x1. I glued it to a board 3 times with water glass and waited 24 hours. It should have held but came off the board. Each time I tried something different. The fourth time, I sprayed shout on the face, used the 280 soft wheel, glued and waited 48 hours. It stayed on the board. Some material really soaks up oil including Blue Mountain and Tahoma. Both stink of oil after being slabbed and cleaned with dish soap and water.
Replying with regard to waterglass/sodium silicate solution ...
In addition to oily rough causing adhesion problems, any kind of coating on the wood (paint, varnish, acrylic, oil, ...) will also interfere with waterglass. 1dave had pointed out to me that sodium silicate is the glue that is used in making corrugated cardboard. In addition to a drying process, the immediate action that glues the cardboard corrugations is water absorption. It draws water out of the waterglass, which causes the sodium silicate to precipitate out as a solid or adhesive. In addition to the evaporation that occurs, the wood block provides the same water absorption action to glue rough and heels/end cuts. |
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Post by HankRocks on Aug 21, 2020 12:24:09 GMT -5
I'm doing Montana moss agate on boards as we speak... Started out with 14, now down to four... I use Elmer's carpenter glue.. Cut my slabs, throw the boards in a bucket of water, let them do their thing, go check the bucket out in a week or so and it's xmas all over again.... Hahahaha Scrape the boards, let them dry out for future use.... I use the Indoor rated Carpenter's glue here to glue rocks for the 10 inch saw. Usually have 10 glued rocks in the cutting queue, and 10 in the glue drying queue. The only fail I have had was when I cut the drying time short. Usually let them set at least 5 to 6 days before cutting. The 25 to 30 pieces of 2X4 that have been used 15 to 20 times each, glue, then oil from saw, then water soak for several days. My guess is that if they were buriedi in the ground here in Gulf Coast area they would last for years. Most lumber around here, even the treated variety, will eventually rot with prolonged contact with soil. I have used pieces of 4X4 and 4X6 for gluing bigger rocks for the 24 inch saw. I give them 2 weeks to dry. |
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Post by stephan on Sept 9, 2020 20:29:11 GMT -5
Gorilla glue also works nicely.
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Post by Mel on Oct 15, 2020 13:03:08 GMT -5
New to all of this. I'm running an older 18" Highland Park. I've have a nice little stack of slabs from river rock, but I keep ending up with a couple inch heel. Maybe I'm being too conservative in where I clamp it, or is there a trick in slabbing the last couple inches? A couple have turned out to be pretty jasper-agate, so I'd love to get the last few slabs. Glue the heel to a piece of wood, and slab that way. Some people here have suggested water based adhesive, the local rock guy told me he uses JB Weld. YMMV. Slab until you can slab no more, and toss the leftover in the polisher  |
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Post by Mel on Oct 15, 2020 13:45:43 GMT -5
Oops!
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Post by stardiamond on Oct 15, 2020 18:09:43 GMT -5
I'm more interested in quality than quantity. I frequently slab small rough and heels that produce as little as two slabs and one is on the board. I need to be able to recover it and that involves soaking off.
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Nov 15, 2024 17:44:51 GMT -5
Nov 15, 2024 17:44:51 GMT -5
