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Lab talk, the good, the bad, and the ugly
All Porcelain-Press
ips e.max ivoclar
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<blockquote data-quote="sixonice" data-source="post: 3210" data-attributes="member: 2"><p>I can chime in with some help here also. Short pressings are either caused by 1 of 2 things: spruing technique AND/OR temperature. e.max has some specific spruing guidelines. If you have the e.max Press user manual, there are some great pictures of correct spruing. Pressings should be angled out at 40 degree angles, sprued to the long axis of the tooth and sprue and wax-up should be NO taller than 16mm. Ivoclar sells these sprue guides which are fool proof. They have one for the 100 gram & another for the 200 gram ring. They are only like 8 or 9 bucks and will really help you position the sprues & wax-ups correctly. The burn-out temperature should be 1562 fahrenheit. Sometimes labs increase temps up to 1600 F. If your burn-out oven is a long walk from the press that could be a problem also. Your ring may be cooling down too much on the way over. You may want to move the press a bit closer to the burn-out oven. Let us know how you make out in the future. I would like to help you overcome your issues.</p></blockquote><p></p>
[QUOTE="sixonice, post: 3210, member: 2"] I can chime in with some help here also. Short pressings are either caused by 1 of 2 things: spruing technique AND/OR temperature. e.max has some specific spruing guidelines. If you have the e.max Press user manual, there are some great pictures of correct spruing. Pressings should be angled out at 40 degree angles, sprued to the long axis of the tooth and sprue and wax-up should be NO taller than 16mm. Ivoclar sells these sprue guides which are fool proof. They have one for the 100 gram & another for the 200 gram ring. They are only like 8 or 9 bucks and will really help you position the sprues & wax-ups correctly. The burn-out temperature should be 1562 fahrenheit. Sometimes labs increase temps up to 1600 F. If your burn-out oven is a long walk from the press that could be a problem also. Your ring may be cooling down too much on the way over. You may want to move the press a bit closer to the burn-out oven. Let us know how you make out in the future. I would like to help you overcome your issues. [/QUOTE]
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Lab talk, the good, the bad, and the ugly
All Porcelain-Press
ips e.max ivoclar
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