Forums
New posts
Search forums
What's new
New posts
Latest activity
Articles
Members
Current visitors
Log in
Register
What's new
Search
Search
Search titles only
New posts
Search forums
Menu
Log in
Register
Install the app
Install
Forums
Lab talk, the good, the bad, and the ugly
All Porcelain-Press
investment for emax
JavaScript is disabled. For a better experience, please enable JavaScript in your browser before proceeding.
You are using an out of date browser. It may not display this or other websites correctly.
You should upgrade or use an
alternative browser
.
Reply to thread
Message
<blockquote data-quote="Zubler USA" data-source="post: 227442" data-attributes="member: 6881"><p>Each investment is different to a certain degree. Many share similar components, thus similar issues. Our instructions specifically say not to use a pressure pot. In every lab that I have tried to solve cracking issues in, never once did I introduce a pressure pot. It was usually mix speed/time and bench set time/procedure. Some times people spruing too close to the wall was a factor, sometimes people putting rings in burnout ovens right next to the heating elements and over filling the burnout oven. There are other factors also, I saw a technician wet model trimming rings right before he put them in a burnout oven. He wondered why the bottom half of the ring cracked during the pressing cycle. I saw some technician running their rings under water right before they put them into the burnout oven, which is ironic, considering the benchset is supposed to be about getting rid of moisture. Debubblizers keep investment from setting up and cause fining, Vaseline keeps investment from setting up and causes exploding rings or cracking. Some people will swear by their debubblizer, others never use it. Vaseline make it easier to remove ring formers, but is often overused and actually ruins ring formers. I have seen others trying to mix too much investment at one time and it would start setting up when they pouring their last ring. But mostly...mixing speed/time and bench set. The faster you mix, the hotter your rings get and more efficient your bench set gets. But some investment materials require a slower mix, thus a longer bench set. I am certain there could be more ways to crack rings I haven't mentioned brought into the discussion, but those are the most common.</p><p></p><p>Get rid of all your extra accoutrements and follow the instructions.</p><p>Process Consistency & Patience my friends...</p></blockquote><p></p>
[QUOTE="Zubler USA, post: 227442, member: 6881"] Each investment is different to a certain degree. Many share similar components, thus similar issues. Our instructions specifically say not to use a pressure pot. In every lab that I have tried to solve cracking issues in, never once did I introduce a pressure pot. It was usually mix speed/time and bench set time/procedure. Some times people spruing too close to the wall was a factor, sometimes people putting rings in burnout ovens right next to the heating elements and over filling the burnout oven. There are other factors also, I saw a technician wet model trimming rings right before he put them in a burnout oven. He wondered why the bottom half of the ring cracked during the pressing cycle. I saw some technician running their rings under water right before they put them into the burnout oven, which is ironic, considering the benchset is supposed to be about getting rid of moisture. Debubblizers keep investment from setting up and cause fining, Vaseline keeps investment from setting up and causes exploding rings or cracking. Some people will swear by their debubblizer, others never use it. Vaseline make it easier to remove ring formers, but is often overused and actually ruins ring formers. I have seen others trying to mix too much investment at one time and it would start setting up when they pouring their last ring. But mostly...mixing speed/time and bench set. The faster you mix, the hotter your rings get and more efficient your bench set gets. But some investment materials require a slower mix, thus a longer bench set. I am certain there could be more ways to crack rings I haven't mentioned brought into the discussion, but those are the most common. Get rid of all your extra accoutrements and follow the instructions. Process Consistency & Patience my friends... [/QUOTE]
Insert quotes…
Verification
Who do we work for?
Post reply
Forums
Lab talk, the good, the bad, and the ugly
All Porcelain-Press
investment for emax
Top
Bottom