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Lab talk, the good, the bad, and the ugly
Dental-CAD
What are your parameters on 3Shape Full Contour Crown.
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<blockquote data-quote="CoolHandLuke" data-source="post: 343906" data-attributes="member: 4850"><p>right on, the extra diameter (or radius in this case) affords your mill 2 things: some tool runout/deflection space, and debris evacuation space.</p><p></p><p>in order to Mill a hole you must move in a spiral, down to the apex of the hole. with an end mill you must NOT move straight down like a drill would. this would make the tool flute clog with material bind up the tool, and break it. this is not 100% true for all materials, but for milling where large cuts are required, or where cutter fluid must get to the tip of the tool to cool it, this is true (i.e. titanium, cocr, polycarbonate and acetal)</p><p></p><p>with zirconia there is a LOT of loose debris though, so the extra radius for chip evac is 100% needed.</p></blockquote><p></p>
[QUOTE="CoolHandLuke, post: 343906, member: 4850"] right on, the extra diameter (or radius in this case) affords your mill 2 things: some tool runout/deflection space, and debris evacuation space. in order to Mill a hole you must move in a spiral, down to the apex of the hole. with an end mill you must NOT move straight down like a drill would. this would make the tool flute clog with material bind up the tool, and break it. this is not 100% true for all materials, but for milling where large cuts are required, or where cutter fluid must get to the tip of the tool to cool it, this is true (i.e. titanium, cocr, polycarbonate and acetal) with zirconia there is a LOT of loose debris though, so the extra radius for chip evac is 100% needed. [/QUOTE]
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Lab talk, the good, the bad, and the ugly
Dental-CAD
What are your parameters on 3Shape Full Contour Crown.
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