1-take it back to the original place does it still do the same thing or it cures it?Hi Everyone,
I recently moved my lab to another location and my sintering furnace has been acting up. All the margins on my crowns are being overbaked which make the margins come out white. I have using calibration rings to figure out true temps. The first calibration ring told me my temp is over 18 degrees C tooo hot. So I adjusted accordingly. Put some crowns in overnight and still white margins but not as bad. I decided to bake another calibration ring and this time it measured 9 degrees too hot. I adjusted accordingly and this time the crowns in overnight and they came out perfect the way it was before I moved. I thought everything was fixed and back to normal so I ran crowns through the 3rd night but the over baking issue came back. It wasn't bad as the first and second time but still noticeable. Luckily the crowns are still useable. I was wondering if anyone has had this kind of issue before. I ordered more rings to try to calibrate again but I am hoping I could get some more insight and solutions.
Furnace: Mihm Vogt Ht-S Speed
Zirconia: Origin Beyond Plus
Ive tried evaluating with the disks but I've found that they are of poor quality and not exactly round. To use a micrometer and measure gives false readings because it has different sizes as you progress around the perimeter the fired sample with the micrometer.Hi Everyone,
I recently moved my lab to another location and my sintering furnace has been acting up. All the margins on my crowns are being overbaked which make the margins come out white. I have using calibration rings to figure out true temps. The first calibration ring told me my temp is over 18 degrees C tooo hot. So I adjusted accordingly. Put some crowns in overnight and still white margins but not as bad. I decided to bake another calibration ring and this time it measured 9 degrees too hot. I adjusted accordingly and this time the crowns in overnight and they came out perfect the way it was before I moved. I thought everything was fixed and back to normal so I ran crowns through the 3rd night but the over baking issue came back. It wasn't bad as the first and second time but still noticeable. Luckily the crowns are still useable. I was wondering if anyone has had this kind of issue before. I ordered more rings to try to calibrate again but I am hoping I could get some more insight and solutions.
Furnace: Mihm Vogt Ht-S Speed
Zirconia: Origin Beyond Plus
I dunno which calibration test piece this is, but generally speaking, this is why the manufacturers specify a place to measure from consistently- it controls for the fact that the press dies they make the calibration discs/rings from are not perfectly round. The manufacturers verify accuracy specifically for the areas you're told to measure from, but not necessarily elsewhere. On the Temptabs we use, you measure parallel to the flattened edge of the disc, while the Ferro PTCR rings specify measurement between the two Ts on either side of the ring.Ive tried evaluating with the disks but I've found that they are of poor quality and not exactly round. To use a micrometer and measure gives false readings because it has different sizes as you progress around the perimeter the fired sample with the micrometer.
