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Post by orrum on Jul 2, 2015 7:41:59 GMT -5
Off on another hare brained journey. So yall glue boards to rocks with wood glue to slab and then to get them apart you soak it in water.
I want to glue several rocks together, using flat sawed surface cleaned very well. Then slab saw them crossways and then get them back apart by hopefully soaking in water.
The pieces will be a inch to inch and a half across and about a quarter inch thick. Therefore the final glued surface will be a inch or more wide after sawing. Will it soak apart and if so how long?
To be fair what I am attempting is a hot pot holder with a parquet(is that the proper term?) chopped up look but with a specific color pattern. After ungluing the pieces I will arrange them on a sturdy base snd glue down by 330 epoxy and then use painters tape around as a dam and pour it full to cover and fill my cracks with polyurethane I want a very close fit but also have tiny spaces between pieces of rock that will fill like groat with polyurethane, think giant intarsia.
Or it could be a planter stand or a place to set a cold pitcher of tea etc.
Thanks I love yall brains!
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Post by orrum on Jul 2, 2015 7:44:53 GMT -5
On the list of new threads there is a open book pic beside my title, what is that about?
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Fossilman
Cave Dweller
Member since January 2009
Posts: 20,711
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Post by Fossilman on Jul 2, 2015 9:32:49 GMT -5
Some of my glued rocks take a bit over a week to soak off the wood! If I was in a hurry on the rock,I just cut the wood off the rock with the saw.....Sand off the little bit of wood that is left!! I have had some that took two weeks to soak off too......
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Post by stardiamond on Jul 2, 2015 9:48:26 GMT -5
I switched from wood glue to sodium silicate. It dries faster and I was hoping that it would dissolve faster in water. I haven't been patient enough to find out.
Many years ago I made a chess board in wood shop. I was told to glue together strips of light and dark wood, cross cut the strips and then glue them staggering the strips to get the checkerboard effect. I've been thinking about doing something like this with slabs and epoxy.
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Post by woodman on Jul 2, 2015 17:42:18 GMT -5
I would use super glue, heat or cold will break the bond. Heat does work better tho. I got an old oven in the shop to cook out oil and to break glue bonds.
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Post by orrum on Jul 2, 2015 18:03:36 GMT -5
Wow it takes a while to soak off doesn't it. I am afraid to use super glue because they will break when I try to separate the stones!
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Post by woodman on Jul 2, 2015 20:39:51 GMT -5
Wow it takes a while to soak off doesn't it. I am afraid to use super glue because they will break when I try to separate the stones! Try it on something of no value and when you are ready to seperate, put it in and oven about 250 degrees. I am not sure of the precise debonding temp tho, It may be lower.
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Post by orrum on Jul 2, 2015 21:49:41 GMT -5
Ok gonna try the oven 2moro on some super glue scraps!
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Post by orrum on Jul 3, 2015 10:06:57 GMT -5
Ok Woodman I just glued two tegg slices together with super glue!
Gonna let em dry all day and nite. Then tomoro I will bake them at 250 and see how we do! Bet my kitchen is gonna stink. If this works I will get a toaster oven at a flea market or somewhere and put it in the rockshop.
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Post by woodman on Jul 3, 2015 16:19:26 GMT -5
100% initial bond strength at 140 F (60 C) 75% at 176 F (80 C) 25% at 212 F (100 C).
Our CA glue will melt at 330 F and start to soften before that.
I found this info on one brand of superglue. I think they all are similar.
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Post by Peruano on Jul 3, 2015 17:16:58 GMT -5
Walmart superglue releases easier than other brands. Get the yellow and black tubes (4 or 5 per packet). Just a bit of heat releases from a nail when used to dob. If I were to try gluing rocks temporarily with wood glue, I'd use thick layers rather than thin. My experience on getting slabs off of wood stubs is that those that have only a thin layer of glue don't allow the water to penetrate and soften as much as thicker layers of glue. Just an observation. Water will cause wood glue to release, but heat and cold help speed things. Freezing in the winter seems to speed up the water soak process. I doubt that 250 would be needed to soften the super glue. Tom
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Post by orrum on Jul 3, 2015 17:45:45 GMT -5
Hey thanks Tom!
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Post by Rockoonz on Jul 4, 2015 1:02:35 GMT -5
Can't you just stack the slabs and just clamp them all together with the saw vice to cut them?
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Post by orrum on Jul 4, 2015 8:38:56 GMT -5
They need to be trim sawed after the slab saw to get the angles I need. Then edges ground to do the fine adjustment before getting them unglued.
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Post by orrum on Jul 4, 2015 8:41:30 GMT -5
Got the tegg slices in the oven on a pizza pan baking b at 250 degrees. Can't wait to see if the super glue let's go!
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Fossilman
Cave Dweller
Member since January 2009
Posts: 20,711
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Post by Fossilman on Jul 4, 2015 8:56:01 GMT -5
Did ya' add cheese and pepperoni?? LOL Hope this works for ya'-thumbs up
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Post by orrum on Jul 4, 2015 9:56:13 GMT -5
Success!!!! The tegg slices came apart fairly easy. I took them out and held them with a oven mitt. Then used a butter knife to insert an wiggle here and there snd.... they separated!!!
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Post by woodman on Jul 4, 2015 10:14:48 GMT -5
Success!!!! The tegg slices came apart fairly easy. I took them out and held them with a oven mitt. Then used a butter knife to insert an wiggle here and there snd.... they separated!!! i would let them cool down in the oven, not impotant with this test. i cracked , small checks, in a oiece of hubard basin wood. i think the rapid cooling was the problem. when i let them cool in the oven no problems. glad it works for you.
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Post by phil on Jul 4, 2015 10:28:52 GMT -5
Next time use cardboard in those glue joints. Allows the water to easily penetrate and soften the glue. Only takes a couple days rather then weeks. Use the kind you find in the back of a tablet, not cardboard boxes- they're too flimsy.
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Post by orrum on Jul 4, 2015 13:07:54 GMT -5
Well dan I just glued them! Thanks Phil next time I will use cardboard. We called that paste board when I was growing up. Like in shoe boxes, used it b4 for putting in your shoes when a hole wore thru to protect your socks. Hey I grew up poor! LOL
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