2 eMax questions

[macminn]

We're having a problem every once in a while with pressings coming out very opaque and chalky looking. I'm guessing it's a temp issue. We're using a zubler vario press. Doesn't happen all the time.

Another question is occasionally we get a white spot where the sprue attaches.

Thanks in advance

 

[Gru]

Temp is a good start point. Just a few degrees will change the translucency a noticeable amount. Couldn't guess whether it's the burnout temp or the press temp. Check your sprue size, angle and crown/ ring position for the white spots.

 

[sidesh0wb0b]

pictures?

 

[macminn]

pictures?

I've been too busy to post this, and they didn't keep any I don't think. Will post some next time it happens if I can't find any samples

 

[Zubler USA]

Please post some hi resolution pictures when you have a moment. This will help point out some of the issues you may be having, could also be sprue placement.

 

[macminn]

Here are some pics. The bubble is an anomaly. I haven't seen that before, so am less concerned about that. The pressings are very chalky white. This happens from time to time, can't figure out why. We've had it happen on conventional burnout cycles and quick burnout cycles. We're using Triumph investment.

 

[macminn]

Here are some pics. The bubble is an anomaly. I haven't seen that before, so am less concerned about that. The pressings are very chalky white. This happens from time to time, can't figure out why. We've had it happen on conventional burnout cycles and quick burnout cycles. We're using Triumph investment.

We're going to give Microstar a try. Great support from Chris at Zubler! Thank you!

 

[sidesh0wb0b]

thats def temp
whether it be burnout temp or press temp i cant be certain but i would lean toward press temp being too hot. far too hot.

 

[sidesh0wb0b]

We're going to give Microstar a try. Great support from Chris at Zubler! Thank you!

get ahold of Zubler, there looks to be something off with the pressing parameters. im sure they will get it dialed in for you

 

[Zubler USA]

Our ceramists thinks it was too hot also, however we are unsure of the thermal characteristics of this Triumph investment and would like him to try some known material. He has some Microstar in stock. Since we are familiar with this investment, I asked him to use this investment as I suspect it has a higher thermal mass than this Triumph investment. Although the temperature settings could be adjusted, doing so would suggest the problem was in one place when it may actually be in another. If he has the same results with the Microstar investment, then know we must look more closely at the ovens ( or Pressing).

 

[sidesh0wb0b]

Our ceramists thinks it was too hot also, however we are unsure of the thermal characteristics of this Triumph investment and would like him to try some known material. He has some Microstar in stock. Since we are familiar with this investment, I asked him to use this investment as I suspect it has a higher thermal mass than this Triumph investment. Although the temperature settings could be adjusted, doing so would suggest the problem was in one place when it may actually be in another. If he has the same results with the Microstar investment, then know we must look more closely at the ovens ( or Pressing).

okay chris, keep us posted.
ive used triumph before, its not my fav investment but i never had anything like this happen. i would still lean heavily toward pressing parameters being off. that LD is overfired.

 

[macminn]

Pressed 2 rings yesterday using Microstar, came out better than we've seen for a very long time. Anyone want to buy some Triumph investment?

 

[sidesh0wb0b]

Pressed 2 rings yesterday using Microstar, came out better than we've seen for a very long time. Anyone want to buy some Triumph investment?

well thats excellent news!
post some pics!

 

[Zubler USA]

Guess that was the problem.