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Lab talk, the good, the bad, and the ugly
Zirconium
Why did this zirconia fracture? Pics included
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<blockquote data-quote="CoolHandLuke" data-source="post: 200437" data-attributes="member: 4850"><p>marcus</p><p></p><p>think of it this way, the big support is a giant heat-sink like in a computer. you want it to take some heat to help the bridge stay consistent at every point of the process, but in this case it is acting like an actual heat sink, sucking all the thermal energy out of the bridge because there is a lot of contact (sprues) between your bridge and the support bar</p><p></p><p>fewer sprues is the first thing, i'd reduce it down to about 5. one on each end and three at even spacing between them.</p><p></p><p>i'm not sure if your mill is a 5axis mill, but you can use 5-axis undercut milling in your template by adding "< UNDERCUT10/10/10 >" with no space. paste it in your Internal finishing stage (between the words INTERNAL FINISHING and < SPIRAL ... > ) , and it will calculate each internal intaglio surface with +/- 10 degrees of 5-axis continuous finishing. this takes a lot longer to do but will let you get a slightly shallower puck. maybe -2 or 3 mils.</p><p></p><p>check it in the simulation before you mill it and make sure its not tilted too far that the undercut can't reach.</p></blockquote><p></p>
[QUOTE="CoolHandLuke, post: 200437, member: 4850"] marcus think of it this way, the big support is a giant heat-sink like in a computer. you want it to take some heat to help the bridge stay consistent at every point of the process, but in this case it is acting like an actual heat sink, sucking all the thermal energy out of the bridge because there is a lot of contact (sprues) between your bridge and the support bar fewer sprues is the first thing, i'd reduce it down to about 5. one on each end and three at even spacing between them. i'm not sure if your mill is a 5axis mill, but you can use 5-axis undercut milling in your template by adding "< UNDERCUT10/10/10 >" with no space. paste it in your Internal finishing stage (between the words INTERNAL FINISHING and < SPIRAL ... > ) , and it will calculate each internal intaglio surface with +/- 10 degrees of 5-axis continuous finishing. this takes a lot longer to do but will let you get a slightly shallower puck. maybe -2 or 3 mils. check it in the simulation before you mill it and make sure its not tilted too far that the undercut can't reach. [/QUOTE]
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Lab talk, the good, the bad, and the ugly
Zirconium
Why did this zirconia fracture? Pics included
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