Deleted
Deleted Member
Member since January 1970
Posts: 0
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Post by Deleted on Apr 21, 2018 10:33:32 GMT -5
We have a lot of end pieces. We want to glue them to 2/4"s so we can slab the ends. What kind of glue should be used to do this? I want glue that will hold and that will let go when finished. Also need to know how to separate the 2x4 and the last slab. Thanks. Have been a Water Glass user since day 1. only lost one or 2 so far .until the last batch. I glued up 20 or so rocks,let them sit for 3 days. the first 3 i cut fell off after 1,or less slabs. so i am thinking of why all of a sudden they are falling off? does the stuff go bad? |
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Post by 1dave on Apr 21, 2018 12:19:18 GMT -5
I haven't done a lot of slabbing yet. What I have done, I've done mostly by hand. Is there an advantage to gluing over using a slab grabber? It seems like gluing is sort of a pain if a slab grabber works just as well. It gets expensive when you cut off a slice of slab grabber. |
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quartz
Cave Dweller 
breakin' rocks in the hot sun
Member since February 2010
Posts: 3,359
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Post by quartz on Apr 21, 2018 12:42:20 GMT -5
Some say waterglass goes bad, but what I have was found at sales several years ago, probably easily 20 years old as I've had it for about 15. I am careful about clean rocks and 2x4's, and a good solid set of the rock on the board.
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Deleted
Deleted Member
Member since January 1970
Posts: 0
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Post by Deleted on Apr 21, 2018 13:17:46 GMT -5
Some say waterglass goes bad, but what I have was found at sales several years ago, probably easily 20 years old as I've had it for about 15. I am careful about clean rocks and 2x4's, and a good solid set of the rock on the board. i know,careful,me to it is very upsetting,3 rocks in a row! i do not want to chance it again i will remove all the rocks from their boards(soak) dry and re glue with new glue |
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Post by Peruano on Apr 21, 2018 20:36:55 GMT -5
The only times I've had carpenter's glue fail to hold a rock on the stub were: 1. When the glue was not dry before it was subjected to freezing or close to freezing temperatures.
2. When I used too little glue for the size or weight of the rock; and 3. Possibly when the rock or wooden stub had oil residue that prevented the glue from grabbing.
I always saw a new (fresh/oil free) surface on the stub (even tho the rest of the stub retains some oil residue from previous use), and I always allow the glue to dry overnight. I saw off the rock end slab (with a hacksaw) so that the water soak only has 1/4 to 1/2" of wood to penetrate to begin releasing the glue. Nearly always a 24 hr soak is plenty and often only an hour or two will do it.
I know other things will work but carpenter's glue seems as cheap and easy as anything and is readily available to everyone.
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Fossilman
Cave Dweller
Member since January 2009
Posts: 20,723 
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Post by Fossilman on Apr 22, 2018 8:45:18 GMT -5
I use carpenters glue...Let them set for a week, than start cutting away... When finished to the last cut on the board, I just throw it in a bucket of water and let the water dissolve the glue on the boards.. Sometimes it takes a week or more....
I have about 20 rocks that are ready for the boards now...
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Post by woodman on Apr 22, 2018 9:14:53 GMT -5
I Just use some cardboard and superglue and glue the end to a fresh cut piece in the saw. that way the cats are parallel to the last cut. both pices have to be degreased and clean. Problaly would not use this method when using water to cool. cardboard may melt, but work good with oil.
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cigarboxrock
starting to shine!
Member since December 2017
Posts: 25
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Post by cigarboxrock on May 6, 2018 9:52:51 GMT -5
Here at CigarBoxRock machine shop we use JB weld. A lot of folks do not think they want to deal with trying to remove rock after cutting.but not an issue.
Since most all of our test cutting is wet testing expensive 20 to 36 inch saws with 6 to 8 pound chunks we can not risk slightest risk of failure and it never has. Last slice just cut through JB weld joint.
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mikeinsjc
spending too much on rocks
Member since June 2010
Posts: 329
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Post by mikeinsjc on May 8, 2018 16:49:33 GMT -5
I use gorilla glue. I cut a block of 4x6 and glue rock to three sides. The last cut is right next to the block and sometimes is half rock and half wood. There is no waste and no soaking to remove the last piece. I wipe the slabs with acetone prior to applying the glue, and wire-brush the wood block. I have never had a piece come loose.
As a previous post mentioned, gorilla glue expands. I will sometimes glue a rock that is not even close to flat on a block, and my last cut is mostly glue. I do this to Montana Moss agates quite often as there are some nice patterns and you want no waste.
I have never used a grabber before. I have had rocks come loose in the vice before (twice) trashing a 24" blade each time. The grabber seems a marginal device to me. Why risk destroying a blade? Anytime you find yourself thinking "that should hold", find another way to hold the rock.
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Post by stardiamond on May 13, 2018 18:31:19 GMT -5
Another vote for waterglass. Rock never came off the board and soaks off.
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hh5
starting to spend too much on rocks
Member since January 2012
Posts: 136
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Post by hh5 on Jun 7, 2018 20:13:54 GMT -5
I also use waterglass (sodium Silicate) and have only had 1 rock come off.
The one that came off was due to me reusing a 2x4 that had not completely dried out
after using it a few weeks earlier. I now have a bucket sitting out in the sun with dried out 2x4s and make
sure I don't reuse one that has recently been used.
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Fossilman
Cave Dweller
Member since January 2009
Posts: 20,723
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Post by Fossilman on Jun 8, 2018 9:51:40 GMT -5
Just finished 22 2x4 boards with material on them, glued with Carpenters glue... Only lost one, that fell off...Pretty good odds and the glue is inexpensive..
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