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Lab talk, the good, the bad, and the ugly
All Porcelain-Press
Zubler updates...
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<blockquote data-quote="user name" data-source="post: 87207" data-attributes="member: 1719"><p>The ingot doesnt actually get that hot. They calculate the temp. in the muffle based on the assumtion that you are using an investment like microstar or 144, and a disposable plunger because of what they call the thermal mass...if you used speed and an alox plunger you have two different materials to heat up that arent equally conductive. They run the heat up to get everything heated to the proper press temp quickly. If your thermocouple shows 910, the inside of your ring would be considerably less. That means the press will take longer. The idea is to heat the INSIDE of the ring to the desired temp (910) and then wham-o, shove the ingot in and get it out of the press. </p><p></p><p>So..it doesnt get the ingot any hotter. Its much like cooking. The oven temp isnt the goal. You use a meat thermometer to determine when its done.</p></blockquote><p></p>
[QUOTE="user name, post: 87207, member: 1719"] The ingot doesnt actually get that hot. They calculate the temp. in the muffle based on the assumtion that you are using an investment like microstar or 144, and a disposable plunger because of what they call the thermal mass...if you used speed and an alox plunger you have two different materials to heat up that arent equally conductive. They run the heat up to get everything heated to the proper press temp quickly. If your thermocouple shows 910, the inside of your ring would be considerably less. That means the press will take longer. The idea is to heat the INSIDE of the ring to the desired temp (910) and then wham-o, shove the ingot in and get it out of the press. So..it doesnt get the ingot any hotter. Its much like cooking. The oven temp isnt the goal. You use a meat thermometer to determine when its done. [/QUOTE]
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Lab talk, the good, the bad, and the ugly
All Porcelain-Press
Zubler updates...
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