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	<title>BritishIdeas &#187; tweaks</title>
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	<link>http://www.britishideas.com</link>
	<description>Interesting Tech Projects</description>
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		<title>CNC Cutting Speeds</title>
		<link>http://www.britishideas.com/2008/09/11/cnc-cutting-speeds/</link>
		<comments>http://www.britishideas.com/2008/09/11/cnc-cutting-speeds/#comments</comments>
		<pubDate>Fri, 12 Sep 2008 04:52:56 +0000</pubDate>
		<dc:creator>Andy</dc:creator>
				<category><![CDATA[CNC]]></category>
		<category><![CDATA[speed]]></category>
		<category><![CDATA[tweaks]]></category>

		<guid isPermaLink="false">http://www.britishideas.com/2008/09/11/cnc-cutting-speeds/</guid>
		<description><![CDATA[I am working on a design that basically involves cutting out a 4&#8243; diameter disk from 1/4&#8243; thick wood, with some shapes pocketed into the surface of the disk. I have been using 10 inches per minute (IPM) to cut through the Poplar and I had no clue if this is average, fast or slow.]]></description>
			<content:encoded><![CDATA[<p>I am working on a design that basically involves cutting out a 4&#8243; diameter disk from 1/4&#8243; thick wood, with some shapes pocketed into the surface of the disk. I have been using 10 inches per minute (IPM) to cut through the Poplar and I had no clue if this is average, fast or slow. What I do know is that it is painful to watch.</p>
<p>At 10 IPM cutting out the design took 67 minutes. That is probably split 60%/40% with the majority on the pocketing. Too long for my liking. I decided to try and reduce the cutting time. First I increased the speed to 30IPM, which is nearly the maximum that my PC can go. Next I reduced the depth of the pockets from 0.15&#8243; to 0.10&#8243;. This saves an extra pass.</p>
<p>The new time to cut? 20 minutes. Less than 1/3 of the original time. But that&#8217;s no good if the result is a ragged mess. Tonight I found out &#8211; there are more burrs on the wood, but the vertical edges look just as good as the ones cut at 10 IPM. So I will likely continue to use 30 IPM in the future.</p>
<p>My next aim is to split the cutting into two parts. The pocketing with a 0.0571&#8243; end mill and the rest with a 1/8&#8243; end mill. This should reduce the time even further.</p>
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