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Lab talk, the good, the bad, and the ugly
Dental-CAM
Problems milling zirconia inlays/onlays with a Rolland DWX-52dci, chips and more chips
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<blockquote data-quote="CoolHandLuke" data-source="post: 323687" data-attributes="member: 4850"><p>you'll want to doublecheck your sprue patterning, because inlays and onlays have different integral strength than copings and crowns. don't have cantilevers if you can help it, and generally you want a thick margin that you can finish flat with a bur or a diamond-rubber wheel. increase thickness to about 0.3 or more, to reinforce the margin to counteract the erratic table movements in such a small item.</p><p></p><p>turn the spindle speed UP by a maximum of 10% and leave the feed rate alone. alternatively turn the feed rate down a max of 10% and observe the vibration as the machine does its job. if its really vibrating, you'll have to try something else.</p></blockquote><p></p>
[QUOTE="CoolHandLuke, post: 323687, member: 4850"] you'll want to doublecheck your sprue patterning, because inlays and onlays have different integral strength than copings and crowns. don't have cantilevers if you can help it, and generally you want a thick margin that you can finish flat with a bur or a diamond-rubber wheel. increase thickness to about 0.3 or more, to reinforce the margin to counteract the erratic table movements in such a small item. turn the spindle speed UP by a maximum of 10% and leave the feed rate alone. alternatively turn the feed rate down a max of 10% and observe the vibration as the machine does its job. if its really vibrating, you'll have to try something else. [/QUOTE]
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Lab talk, the good, the bad, and the ugly
Dental-CAM
Problems milling zirconia inlays/onlays with a Rolland DWX-52dci, chips and more chips
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