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Lab talk, the good, the bad, and the ugly
Dental-CAM
Zirkonzahn is it capable of milling metal?
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<blockquote data-quote="brayks" data-source="post: 158139" data-attributes="member: 11275"><p>Sure. Also, below is a "brief" comparison of the Versamill's spindle compared to a "typical" AC spindle that might be found in dental applications.</p><p><img src="http://www.axsysdental.com//images/VersaMILL Features/AC-DCspindleCompare2.jpg" alt="" class="fr-fic fr-dii fr-draggable " style="" /> </p><p>A quick analysis of these graphs shows a typical Brand “X” AC Spindle (1.8kW),characteristically has high torque in the low rpm range. However this range is of no real concern or use to us as we require the spindle to operate at high rpm.</p><p></p><p>The graphs also show the Versamill’s 3kW DC Spindle, in the normal operating rage for our applications, to be 2 to 3 times more powerful than the AC Spindle. For example:</p><p style="margin-left: 20px">At 0-45,000rpm (which is actually quite sufficient) the DC spindle provides a constant torque of 65Ncm while the AC spindle provides significantly lower toque levels which decrease in value from approximately 58Ncm @ 30,000rpm to only 29Ncm @ 45,000rpm (the most useful speed range) - at MAXIMUM rating. Further The AC spindle torque drops to a mere 9Ncm just over 40,000rpm S1 – continuous duty rating.</p> <p style="margin-left: 20px"></p><p>To achieve shorter cycle times for dental restoration manufacturing we require high torque at high spindle speeds (S1 continuous duty ratings). Most (if not all) AC spindles we have seen in "small footprint" CNC machines do not perform at a level to meet our requirements in “hard milling” applications.</p><p></p><p>Of course specifications/curves change from manufacturer to manufacturer and model to model however this is what to characteristically expect.</p><p></p><p>Be very cautious of spindles running at a torque/power level above its S1 rating. Doing so will surely result in high spindle mortality rates.</p><p></p><p>Sorry for the babble; just one guys opinion…</p><p></p><p>Some “interesting” reading (maybe)?: <a href="http://www.walkermachinery.net/fw/main/the-great-spindle-debate-1608.html" target="_blank"><u>http://www.walkermachinery.net/fw/main/the-great-spindle-debate-1608.html</u></a></p></blockquote><p></p>
[QUOTE="brayks, post: 158139, member: 11275"] Sure. Also, below is a "brief" comparison of the Versamill's spindle compared to a "typical" AC spindle that might be found in dental applications. [IMG]http://www.axsysdental.com//images/VersaMILL Features/AC-DCspindleCompare2.jpg[/IMG] A quick analysis of these graphs shows a typical Brand “X” AC Spindle (1.8kW),characteristically has high torque in the low rpm range. However this range is of no real concern or use to us as we require the spindle to operate at high rpm. The graphs also show the Versamill’s 3kW DC Spindle, in the normal operating rage for our applications, to be 2 to 3 times more powerful than the AC Spindle. For example: [INDENT]At 0-45,000rpm (which is actually quite sufficient) the DC spindle provides a constant torque of 65Ncm while the AC spindle provides significantly lower toque levels which decrease in value from approximately 58Ncm @ 30,000rpm to only 29Ncm @ 45,000rpm (the most useful speed range) - at MAXIMUM rating. Further The AC spindle torque drops to a mere 9Ncm just over 40,000rpm S1 – continuous duty rating. [/INDENT] To achieve shorter cycle times for dental restoration manufacturing we require high torque at high spindle speeds (S1 continuous duty ratings). Most (if not all) AC spindles we have seen in "small footprint" CNC machines do not perform at a level to meet our requirements in “hard milling” applications. Of course specifications/curves change from manufacturer to manufacturer and model to model however this is what to characteristically expect. Be very cautious of spindles running at a torque/power level above its S1 rating. Doing so will surely result in high spindle mortality rates. Sorry for the babble; just one guys opinion… Some “interesting” reading (maybe)?: [URL='http://www.walkermachinery.net/fw/main/the-great-spindle-debate-1608.html'][U]http://www.walkermachinery.net/fw/main/the-great-spindle-debate-1608.html[/U][/URL] [/QUOTE]
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Lab talk, the good, the bad, and the ugly
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Zirkonzahn is it capable of milling metal?
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