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/diy/ - Do It Yourself

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2789211 No.2789211 [Reply] [Original]

for leatherwork, you need a very dense material to tool (draw) and stamp on. We all have little granite slabs. I make luggage and messenger bags almost exclusively so that little slab is just top small. 2x3x8 slabs of granite are reterdedly expensive.

here are a few factors I'm considering.

1, my house doesn't have a concrete foundation so reverberation will just always be an issue. I want to get as much force transferred onto what I'm working on as possible.

2, I have read that a work bench the size I'm going to make will weigh 100s of lbs.

3, even the best concrete tables eventually Crack, sometimes within a year.

what are your thoughts

>> No.2789234
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What kind of house do you live in? One of the american ones where the floor is held up by vertical studs standing on concrete? Can you go into the garage where you have a solid floor? You could get rid of the vibrations with enough mass but then again im not sure how much your floor would carry.

Yes it will be slightly heavy, one cubic meter of concrete weighs roughly 2.2 tons. So if your table plate is 1m by 0.6m and 4cm thick just this element would weigh like 50 kilos, my advice would then be to only make it 2cm thick thats 25 kilos.

I have never heard about a concrete table until i saw some concrete furniture at an artsy furniture shop, but as long as you reinforce it properly it should not be a problem. However i would recomment that you buy concrete fibers that you mix in with the concrete instead of using rebar, it is more uniform that way and you save work and can properly pour it and it should not be a problem

If really ALL you neeet is a concrete surface then just get a wooden workbench, carve out an area on it as big as you want but at least 2cm deep then out a concrete slab in. In this case i think you could also use ceramic tiles they are even harder than concrete, these tables used to be popular here in germany and even kitchen worksurfaces wete made like this, picrelated

>t master bricklayer/concrete builder

>> No.2789235

>he wants an 8ft long slab of granite for leatherworking

bitch, get real. total overkill.

>> No.2789430

I'm interested in Sand lime / lime silicate bricks, I think their due for bringing back. Have you worked with them much? Any significant cons you've experienced if so?

>> No.2789687

I make luggage, anon. The main body panel can be very large, sometimes up to 4 or 5 feet, depending on some boring things. my current work bench is a desk only 69 inches wide. I have a dream.

>> No.2789689

do you mean that primitive method where you throw lime in a fire to cook up, then make a slake pit?

>> No.2789691

I'm thinking of that, but instead of carving out all of that wood, I'll just make a mould on the top, then add concrete.

Got any tips for getting rid of bubbles? I don't think I need one of those industrial 3ft concrete vibrators. I've seen youtubers have success just using a little clit vibrator instead but their moulds were smaller.

>> No.2789694

Pour some concrete and put a big granite bathroom tile over it. If you’re going for big impacts, put a sheet of steel instead. Put it on top of the poured concrete with the fasteners already in so you know exactly where to drill the anchors. Metal fencing panel als rebar, even if it cracks it’ll still be held together by the steel top and rebar

Put something not round in a drill and spin it while holding it against the mould

>> No.2789743

I've used a sawzall/reciprocating saw with no blade installed to vibrate small concrete formwork.

>> No.2789806

Naw, it's slaked lime mixed with sand, pressed into brick shape then autoclaved to cure. From what I understand, in the autoclave the sand and lime form calcium silicate hydrates, which is essentially cement. I've read it can still breath, my assumption is that it's between cement and plaster in it's breathability. I've also read it doesn't require sharp sand, which if true, opens additional options for sourcing it's primary ingredient.

>> No.2790163

>what are your thoughts
You already figured it'll be heavy, so how do plan to move it to it's final destination?

>> No.2790459

Child abuse

>> No.2792129

>2x3x8 slabs of granite are reterdedly expensive.

Not if they're a tombstone that wasn't paid for. Visit your local monument shop and ask about the size you need. They may have a damaged granite stone in their scrap pile too.

>> No.2794143

Yeah i know them, for a leatherworking bench idk about their cons their surface does sand a little bit though i think that stops after a while. For bzilding they are arguably slightly worse (or rather different) than your standard clay ceramic brick though you can use them interchangeably (slightly worse thermal insulation but better soundproofness). Here in germany they are mainly used in exposed brick walls because of their nice smooth and white surfaces. Their main selling point nowadays is that they soak up CO2 from the air (as lime does because you burned out the CO2 during burning and it wants to bind as much of it as it has lost during burning to revert back to CaCo3) CaCo3 is also the base of cement though burnt above sinter temperature 1450° C which makes stones melt. Cement would also like to soak up as much co2 as it lost during burning but we cannot let that happen otherwise the rebar steel is going to rust. Makd no mistake the lime used in creating them is still burnt lime.

>> No.2794146

Hit the mold with a hammer repeatly if you followed my advice and did not use rebar, also bear in mind how concrete works, any leftover water that fails to bind to the cement will leave it eventually leaving you with holes in your surface. The ideal ratio of water to concrete is somewhere aroun 0.45 to 0.6, i recommend to go for .45 and also leave it in the coverage for maybe like a week, the official number is 28 days left in coversfe but noone does that. Additionally you could let it cure under water since that pretty much unlocks the maximim hardness for concrete (this is how cement probes for testing are cured)

>> No.2794147

>sharp sand
Sharp sand is the undesireable sand, made by glaciers who crushed every pebble at its THICKEST point, easily reproduceable by something called a "einschwingiger Backenbrecher" in german. Round sand on the other hand is the rarer one everyone needs, made by rivers banging pebbles on one another breakinh them at their WEAKEST point meaning the grain structure of anything made by this material will be homougenously stable. Also the round shape makes it bind into the grain structure more easily, sharp stuff increases your binder needs.
"Breathability" is kind of a meme and the long and winded formulas we had to learn could be replaced with common sense, especially in the way this type of brick is used. Main thing to understand is that your house breathes and sweats through its windows.

>> No.2794157

Also sorry for my late response, i genuinely thought this thread was gonna die within a minute of me posting, kek. They tend to do that.

>> No.2795005

Sry my bad The ideal ratio of CEMENT to water is 0.45 to 0.60

>> No.2795074

Could you instead just have a table made of wood with steel sheet glued to the top of it?

>> No.2795077

>even the best concrete tables eventually Crack
proof you're are doing it wrong

also the heavier your slab the more stable it is for hitting on, in other words the heavier the less it moves when stamped ergo cleaner stamp. there is a limit to which this matters but you will see better results than a skinny little granite bit used like a cutting board.

>> No.2795079

you get several buddies to lift it with you. it's how my brother blew out his back- flipping his concrete island into place.

>> No.2795081

>sheet steel
this isn't welding you fucking retard. pounding shit on a stainless table would be fucking loud as hell and about as awful a solid surface as possible. you should shut your fucking mouth if you can't understand such a basic concept instead of trying to give advice on /diy/.

>> No.2795090

A wood bench with a bonded steel top is not the same as a steel bench. The wood deadens the sound a lot. I can't say how it compares to a concrete bench top since I've never had one, but it's not all that much louder to hammer on than a plain old wood bench top.

Also you should really talk to someone about your anger issues.

>> No.2795172

>Also you should really talk to someone about your anger issues.
He would but no one will talk to him due to his anger issues.

>> No.2795737

Whats a concrete island?

>> No.2795739

Sorry i didnt sage i just forgot to delete it afterr sageing some jewish fag on pol
Hahahah that is topkek
Yes that is true but i figured he needs a concrete one because of vibrations? I dont really know what exactly the Anforderung to his endeavour are

>> No.2795824
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Get a big ass used surface plate on fb. You won't have any issues with vibrations, kek.

>> No.2795869

>must pick up, will not deliver
>will not help load, bring your own equipment

>> No.2795880

A couple buddies and a case of beer and you can load that thing into the back of your Ranger ez.

>> No.2796142

Awww someone missed nap time.
If you use proper admixtures/plasticizers, fibers, and get your mix dialed in, you can absolutely make concrete that won’t crack and be unbelievably strong and resilient. It’s not granite, granted (tee hee), but GFRC is pretty damn strong.
I get all my admixtures and fibers from below. You can also find other companies for similar products.

>> No.2796146

I should add that yes I’m aware “all concrete cracks”. The cracks don’t spread and their hairline and on the edges if they appear at all. It almost acts like epoxy if done correctly.

>> No.2796179

I don't get why people do this to their kids. mean-spirited pranks that they 100% know are going to make their kid cry, betraying their child's complete trust in them for a laugh then posting it online for updoots.
the kid's not going to understand the joke, and even if they eventually find it funny they're never going to forget the betrayal they felt upon taking off the blindfold and believing wholeheartedly that their parents made them put their finger in a dog's ass.

truly millennials inherited their parents' narcissism and sociopathy. I guess it's up to the zoomers to break the cycle now.

>> No.2796188

"All concrete cracks" i have never heard that and im a master steel concrete builder, are you sure this isn just some kind of salesman trope like "breakfast ist the most important meal of the day" pushed by lazy cement manufacturers?

>> No.2796581

Don’t know just always heard that and people here tend to get argumentative.