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	<title>Comments on: One-way turn of the screw</title>
	<atom:link href="http://architectures.danlockton.co.uk/2008/05/26/one-way-turn-of-the-screw/feed/" rel="self" type="application/rss+xml" />
	<link>http://architectures.danlockton.co.uk/2008/05/26/one-way-turn-of-the-screw/</link>
	<description>Using design to influence behaviour</description>
	<lastBuildDate>Mon, 15 Mar 2010 15:13:05 +0000</lastBuildDate>
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		<title>By: moz</title>
		<link>http://architectures.danlockton.co.uk/2008/05/26/one-way-turn-of-the-screw/comment-page-1/#comment-198680</link>
		<dc:creator>moz</dc:creator>
		<pubDate>Fri, 30 May 2008 07:25:20 +0000</pubDate>
		<guid isPermaLink="false">http://architectures.danlockton.co.uk/?p=299#comment-198680</guid>
		<description>CNC = computer numerical control. Broadly, any computer controlled cutting machine (lathes, laser cutters etc). Not uncommonly costing more than $100k/tonne to buy.</description>
		<content:encoded><![CDATA[<p>CNC = computer numerical control. Broadly, any computer controlled cutting machine (lathes, laser cutters etc). Not uncommonly costing more than $100k/tonne to buy.</p>
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		<title>By: None of 3</title>
		<link>http://architectures.danlockton.co.uk/2008/05/26/one-way-turn-of-the-screw/comment-page-1/#comment-198459</link>
		<dc:creator>None of 3</dc:creator>
		<pubDate>Thu, 29 May 2008 15:42:35 +0000</pubDate>
		<guid isPermaLink="false">http://architectures.danlockton.co.uk/?p=299#comment-198459</guid>
		<description>&quot;CNC&quot; machine?</description>
		<content:encoded><![CDATA[<p>&#8220;CNC&#8221; machine?</p>
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		<title>By: Moz</title>
		<link>http://architectures.danlockton.co.uk/2008/05/26/one-way-turn-of-the-screw/comment-page-1/#comment-198128</link>
		<dc:creator>Moz</dc:creator>
		<pubDate>Wed, 28 May 2008 07:47:16 +0000</pubDate>
		<guid isPermaLink="false">http://architectures.danlockton.co.uk/?p=299#comment-198128</guid>
		<description>Many manufactured objects simply practice security through obscurity - it&#039;s not at all obvious how to open them up without damaging them.

One you haven&#039;t mentioned is glue. Quite a few things have a cover glued on that must be removed before the fasteners can be removed. At times this is as simple as putting holes under the stick-on rubber feet under something, but some cameras also do this with their rubber-like grips. Evn if it&#039;s easy enough to remove the glue, generally it&#039;s impossible to glue it back in place because it deforms when removed.

A surprising number of bigger things are welded into place. At one extreme are things like railway lines and many bridges - you can remove them, but only by cutting them up. But on a more &quot;only done to make removal harder&quot; level it&#039;s not uncommon to see guard rails and so on welded in place simply to stop people unbolting them and removing the guarded object. Or an expensive CNC machine with a nice solid protective frame around it to stop people driving forklifts into it, that also &quot;just happens&quot; to stop the machine being easily dismantled and loaded onto a truck without first cutting the frame away.</description>
		<content:encoded><![CDATA[<p>Many manufactured objects simply practice security through obscurity &#8211; it&#8217;s not at all obvious how to open them up without damaging them.</p>
<p>One you haven&#8217;t mentioned is glue. Quite a few things have a cover glued on that must be removed before the fasteners can be removed. At times this is as simple as putting holes under the stick-on rubber feet under something, but some cameras also do this with their rubber-like grips. Evn if it&#8217;s easy enough to remove the glue, generally it&#8217;s impossible to glue it back in place because it deforms when removed.</p>
<p>A surprising number of bigger things are welded into place. At one extreme are things like railway lines and many bridges &#8211; you can remove them, but only by cutting them up. But on a more &#8220;only done to make removal harder&#8221; level it&#8217;s not uncommon to see guard rails and so on welded in place simply to stop people unbolting them and removing the guarded object. Or an expensive CNC machine with a nice solid protective frame around it to stop people driving forklifts into it, that also &#8220;just happens&#8221; to stop the machine being easily dismantled and loaded onto a truck without first cutting the frame away.</p>
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	<item>
		<title>By: Niet- und nagelfest &#171; m.arschflugkoerper</title>
		<link>http://architectures.danlockton.co.uk/2008/05/26/one-way-turn-of-the-screw/comment-page-1/#comment-197632</link>
		<dc:creator>Niet- und nagelfest &#171; m.arschflugkoerper</dc:creator>
		<pubDate>Mon, 26 May 2008 13:38:54 +0000</pubDate>
		<guid isPermaLink="false">http://architectures.danlockton.co.uk/?p=299#comment-197632</guid>
		<description>[...] Konzept der Idiotensicherheit treibt manchmal gar wunderliche Blüten.    Dieser Eintrag wurde von Mark am 26 Mai, 2008 um 15:38  [...]</description>
		<content:encoded><![CDATA[<p>[...] Konzept der Idiotensicherheit treibt manchmal gar wunderliche Blüten.    Dieser Eintrag wurde von Mark am 26 Mai, 2008 um 15:38  [...]</p>
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		<title>By: Crosbie Fitch</title>
		<link>http://architectures.danlockton.co.uk/2008/05/26/one-way-turn-of-the-screw/comment-page-1/#comment-197573</link>
		<dc:creator>Crosbie Fitch</dc:creator>
		<pubDate>Mon, 26 May 2008 08:51:14 +0000</pubDate>
		<guid isPermaLink="false">http://architectures.danlockton.co.uk/?p=299#comment-197573</guid>
		<description>Some bolts (posidrive, philips, hex) can also be drilled to remove the drive pattern. And then they can have a groove &lt;a href=&quot;http://en.wikipedia.org/wiki/Dremel&quot; rel=&quot;nofollow&quot;&gt;dremelled&lt;/a&gt; back in (for screwdriver).

There are probably some fasteners based on the fish hook mechanism, i.e. easy to get in, but not easy to get out. Cactus thorns, bee stings, arrows, rivets, cavity wall anchors, etc.

One-way fasteners can also be incorporated into the design of larger structures. There are plenty of snap shut plastic cases of non-user serviceable electronic equipment. These either require special tools to prise apart, pressure in precisely the right places, or are not expected to be opened without irreversible damage to the case (either cheaply replaced - or not).

The simple cable tie is one of the cheapest instances of irreversible fastening. There are also the metal customs fasteners with malleable seals - you can break them, but then you can&#039;t refasten them unless you can reproduce the seal. Some food containers also need to be opened with significant force but not closed without it being obvious.

Don&#039;t forget the sand released one-time doors of pyramids, etc.</description>
		<content:encoded><![CDATA[<p>Some bolts (posidrive, philips, hex) can also be drilled to remove the drive pattern. And then they can have a groove <a href="http://en.wikipedia.org/wiki/Dremel" rel="nofollow">dremelled</a> back in (for screwdriver).</p>
<p>There are probably some fasteners based on the fish hook mechanism, i.e. easy to get in, but not easy to get out. Cactus thorns, bee stings, arrows, rivets, cavity wall anchors, etc.</p>
<p>One-way fasteners can also be incorporated into the design of larger structures. There are plenty of snap shut plastic cases of non-user serviceable electronic equipment. These either require special tools to prise apart, pressure in precisely the right places, or are not expected to be opened without irreversible damage to the case (either cheaply replaced &#8211; or not).</p>
<p>The simple cable tie is one of the cheapest instances of irreversible fastening. There are also the metal customs fasteners with malleable seals &#8211; you can break them, but then you can&#8217;t refasten them unless you can reproduce the seal. Some food containers also need to be opened with significant force but not closed without it being obvious.</p>
<p>Don&#8217;t forget the sand released one-time doors of pyramids, etc.</p>
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