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added ikea lack concrete slab stuff; removed keybase txt

Thomas Buck před 4 roky
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28 změnil soubory, kde provedl 73 přidání a 65 odebrání
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input/projects/3d-printing/ikea-lack.md Zobrazit soubor

@@ -12,3 +12,76 @@ flattr: true
12 12
 
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 **More content coming soon!**
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+### Concrete slab for noise and vibration dampening
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+
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+Unfortunately, because the Ikea Lack tables are very lightweight and also hollow, they tend to amplify the sound coming from the 3D printers on them.
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+But there is an easy solution to this: vibration dampening by increasing the mass.
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+This can be achieved for example by simply creating a large concrete slab.
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+In my case, it weighs about 17kg.
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+
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+First, build a simple wooden frame to contain the wet concrete.
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+I've used cheap 40x15x1000mm wood pieces and cut them to 555mm, screwing them together in the corners.
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+For the surface below the frame, I've used an old cardboard box.
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+I've "sealed" the surfaces of the cardboard and the wood pieces with clear flex-o-tape, to avoid the water wicking out of the concrete too fast, and to be able to remove the pieces easily later-on.
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+
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+<div class="lightgallery">
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+    <a href="img/ikea_lack_concrete_1.jpg">
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+        <img src="img/ikea_lack_concrete_1_small.jpg" alt="Simple wooden frame">
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+    </a>
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+    <a href="img/ikea_lack_concrete_2.jpg">
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+        <img src="img/ikea_lack_concrete_2_small.jpg" alt="Screwed together in the corners">
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+    </a>
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+    <a href="img/ikea_lack_concrete_3.jpg">
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+        <img src="img/ikea_lack_concrete_3_small.jpg" alt="Added some tape to seal the surface">
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+    </a>
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+</div>
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+
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+Then I've simply hand-mixed about one half of a 35kg bag of cement/sand mixture with 2l of clear tap-water.
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+The resulting sludge can then be filled into the frame.
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+Apply some vibrations to the edges of the frame using a hammer, and using your hand on top of the concrete, to get most of the bubbles out of the mixture and get it to settle properly.
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+You should then use a piece of wood to really get the surface flat.
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+
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+Also, be careful: avoid contact of the concrete with your skin, it burns after a while!
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+
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+<div class="lightgallery">
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+    <a href="img/ikea_lack_concrete_4.jpg">
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+        <img src="img/ikea_lack_concrete_4_small.jpg" alt="Mixing the concrete">
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+    </a>
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+    <a href="img/ikea_lack_concrete_5.jpg">
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+        <img src="img/ikea_lack_concrete_5_small.jpg" alt="Final consistency">
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+    </a>
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+    <a href="img/ikea_lack_concrete_6.jpg">
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+        <img src="img/ikea_lack_concrete_6_small.jpg" alt="Filling the frame">
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+    </a>
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+    <a href="img/ikea_lack_concrete_7.jpg">
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+        <img src="img/ikea_lack_concrete_7_small.jpg" alt="In my first attempt, I just tried to form the surface by hand. It worked, but is not perfect.">
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+    </a>
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+    <a href="img/ikea_lack_concrete_8.jpg">
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+        <img src="img/ikea_lack_concrete_8_small.jpg" alt="Closing it up for 24h">
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+    </a>
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+    <a href="img/ikea_lack_concrete_9.jpg">
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+        <img src="img/ikea_lack_concrete_9_small.jpg" alt="Side-view">
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+    </a>
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+</div>
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+
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+After about 24h, the frame can already be removed.
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+Because of the large surface area and the low volume of our piece, it get's hard quite quickly.
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+And also, we're not using it for large static loads, so we don't have to wait the full 28-days specified by the manufacturer.
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+The small parts at the edges where the concrete slightly got under the frame can just be broken off by hand.
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+
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+<div class="lightgallery">
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+    <a href="img/ikea_lack_concrete_10.jpg">
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+        <img src="img/ikea_lack_concrete_10_small.jpg" alt="After 24h, one side removed">
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+    </a>
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+    <a href="img/ikea_lack_concrete_11.jpg">
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+        <img src="img/ikea_lack_concrete_11_small.jpg" alt="The small parts at the edge can just be broken off easily by hand">
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+    </a>
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+    <a href="img/ikea_lack_concrete_12.jpg">
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+        <img src="img/ikea_lack_concrete_12_small.jpg" alt="Final result, left view">
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+    </a>
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+    <a href="img/ikea_lack_concrete_13.jpg">
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+        <img src="img/ikea_lack_concrete_13_small.jpg" alt="Final result, right view">
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+    </a>
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+</div>
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+
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+And it works perfectly, the noise of the printer is greatly reduced!

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static/keybase.txt Zobrazit soubor

@@ -1,65 +0,0 @@
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-
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-View my publicly-auditable identity here: https://keybase.io/xythobuz
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-
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-==================================================================
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-

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