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Lab talk, the good, the bad, and the ugly
All Porcelain-Press
E-max LT
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<blockquote data-quote="Dave Smart" data-source="post: 13788" data-attributes="member: 628"><p><strong>e.max under-press or something else??</strong></p><p></p><p>Hi all, I've had a small but frustrating problem when pressing emax in that I get some small areas or craters where the material has a surface void often near the sprue attachment to the pattern. There doesn't seem to be any reaction layer there and there is No shortage of material. I'm using a Gemini 2 pressing furnace which has a "press to finish function" (presses then relaxes and so on until it senses completion) but I still get this showing up on occasion and would like to nail the cause. I've spoken to a couple of reps. and one said maybe too hot and another maybe too cold. I'm working in a range between 910 celcius and 920 . I have had No problems with Zirpress firing at 910c. I'm not sure which would be best: raise the temp., increase the hold time ( now at 28 min. with a 200g ring) or a combination. When i was at the higher temp. range I had a noticeably heavier reaction layer and also had a couple of units "pop" off the sprue before I wished. My average pressing time is about 5 min. from the start of actual pressing.Singles can be 3 min. , multiples 6-8 min. Any and all help with this would be greatly welcomed. Got to love this site!!! </p><p>Thanks, Dave</p></blockquote><p></p>
[QUOTE="Dave Smart, post: 13788, member: 628"] [b]e.max under-press or something else??[/b] Hi all, I've had a small but frustrating problem when pressing emax in that I get some small areas or craters where the material has a surface void often near the sprue attachment to the pattern. There doesn't seem to be any reaction layer there and there is No shortage of material. I'm using a Gemini 2 pressing furnace which has a "press to finish function" (presses then relaxes and so on until it senses completion) but I still get this showing up on occasion and would like to nail the cause. I've spoken to a couple of reps. and one said maybe too hot and another maybe too cold. I'm working in a range between 910 celcius and 920 . I have had No problems with Zirpress firing at 910c. I'm not sure which would be best: raise the temp., increase the hold time ( now at 28 min. with a 200g ring) or a combination. When i was at the higher temp. range I had a noticeably heavier reaction layer and also had a couple of units "pop" off the sprue before I wished. My average pressing time is about 5 min. from the start of actual pressing.Singles can be 3 min. , multiples 6-8 min. Any and all help with this would be greatly welcomed. Got to love this site!!! Thanks, Dave [/QUOTE]
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Lab talk, the good, the bad, and the ugly
All Porcelain-Press
E-max LT
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