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Lab talk, the good, the bad, and the ugly
Zirconium
Cracks in CAD/CAM Zirconium coping Bridges
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<blockquote data-quote="Gabriel" data-source="post: 163802" data-attributes="member: 8853"><p>If you say that all of the problems started a month ago, did you happen to have any serious crash during milling? I'm asking because it is possible that one of your axis ballscrews got damaged... I'm not sure what milling machine you are using, but the ballscrews can get damaged if the liniar rails or liniar ballbearings are not allowed to slide smoothly for any reason which could be due to poor maintenance as CoolHandLuke mentioned. If you used your machine for 5 years, in my opinion you should perform maintenance at least once a year. Depending on the machine the maintenance can be more or less of a headache, but lubrication is essential if you want to keep your machine out of trouble. Also, zirconia powder really does get through the smallest crack. So you could find it has made its way to the ballscrews and rails. Grease and zirconia powder mixed together will result in a very sticky and thick paste which will add a lot of stress on the motors that drive the axis up and down.</p><p>Try cleaning your machine really well and inspect the state of the mechanical moving parts to ensure they are still in good shape, check that the threads are still continuous. If there are any chipped edges, then the movement will suffer when the ballscrew reaches that certain area. This would mean enough disturbance in the movement as to create vibration, and we all know that vibration will cause cracks in zirconia.</p></blockquote><p></p>
[QUOTE="Gabriel, post: 163802, member: 8853"] If you say that all of the problems started a month ago, did you happen to have any serious crash during milling? I'm asking because it is possible that one of your axis ballscrews got damaged... I'm not sure what milling machine you are using, but the ballscrews can get damaged if the liniar rails or liniar ballbearings are not allowed to slide smoothly for any reason which could be due to poor maintenance as CoolHandLuke mentioned. If you used your machine for 5 years, in my opinion you should perform maintenance at least once a year. Depending on the machine the maintenance can be more or less of a headache, but lubrication is essential if you want to keep your machine out of trouble. Also, zirconia powder really does get through the smallest crack. So you could find it has made its way to the ballscrews and rails. Grease and zirconia powder mixed together will result in a very sticky and thick paste which will add a lot of stress on the motors that drive the axis up and down. Try cleaning your machine really well and inspect the state of the mechanical moving parts to ensure they are still in good shape, check that the threads are still continuous. If there are any chipped edges, then the movement will suffer when the ballscrew reaches that certain area. This would mean enough disturbance in the movement as to create vibration, and we all know that vibration will cause cracks in zirconia. [/QUOTE]
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Lab talk, the good, the bad, and the ugly
Zirconium
Cracks in CAD/CAM Zirconium coping Bridges
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