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Lab talk, the good, the bad, and the ugly
Equipment
What features would you like in a burnout oven?
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<blockquote data-quote="dfshorn1" data-source="post: 29328" data-attributes="member: 2975"><p><strong><img src="/forums/images/smilies/test/burnout.gif" class="smilie" loading="lazy" alt="Burnout" title="Burnout Burnout" data-shortname="Burnout" /> oven features - Reply</strong></p><p></p><p>To all who have sent me ideas for the new burn-out oven; I thank you for your input. I would like to address these and let you know what I am intending for my first go around.</p><p>Here are the main ideas mentioned:</p><p> 1.Exhaust filter/ venting system</p><p>As I have mentioned eariler, the external exhaust filter is an expensive add on that was never popular with the Jelenko/ Jelrus burnout ovens because of the added expense compared to venting. I have venting system that is purchased seperately and can be connected to 2 burnout ovens. It has a cup device that sits ontop of the chimney and uses a small electric fan to draw out the gases. This is a low cfm fan, about 60cfm, and has a cooler air intermixer to cool down the exhaust an not damage the fan. The fan will run only when either of the ovens are running a cycle, otherwise it is turned off.</p><p></p><p> 2. Power recovery both during a cycle and in standby -</p><p>The current board design will recover from a power failure during a cycle. I am working on the software changes needed to have it recover while on a timed start. As this requires a real time clock and battery backup.</p><p></p><p> 3. Door type -</p><p>I believe the door will be a swing down type but am still looking at other methods. The reason why I lean towards a swing down door is: One, this is most cost effective way to build and still provide the left or right versatility. Two, Guillotine type doors are notorious for being knocked out of alignment and for wearing the inside insulation on the upper or leading edge of both the door and the chamber thus causing heat to leak from the top. These issues do not exist with a swing down door.</p><p></p><p> 4. Muffle type - hot and cold spots, convection fan -</p><p>This is a subject that is not discussed much. Hot and cold spots are as much a technical issue in burnout ovens as they are in a porcelain furnace. They are just gotten around more easily. However, I have chosen a muffle assembly that is similar to the old Ney 2000 burnout ovens. That is where the similarity ends. The coils wrap around the sides and the back giving 270 degree heat pattern. In other industries, this same muffle is used at heat rates to 100 degrees F p/m. I plan to limit it to 72 degrees F / 50 C thus extending its life by many years. The operating wattage is 1700 watts. While this size wattage is normally for a large oven, I have an inbetween size that has a slightly larger foot print than the medium ovens but has 2/3 more capacity.</p><p></p><p> 5. Preprogramming different investment materials -</p><p>I do not intend to have any preprogramming offered. There are sooo many different types of invest out there and than every tech has his or her variation to the best heating cycle not to mention the differences in ovens.</p><p></p><p>Full retail for all of this is set to be about $1200.</p><p></p><p>I welcome any questions or comments you may have and again, thanks for those already received.</p><p></p><p>Daniel</p></blockquote><p></p>
[QUOTE="dfshorn1, post: 29328, member: 2975"] [b]Burnout oven features - Reply[/b] To all who have sent me ideas for the new burn-out oven; I thank you for your input. I would like to address these and let you know what I am intending for my first go around. Here are the main ideas mentioned: 1.Exhaust filter/ venting system As I have mentioned eariler, the external exhaust filter is an expensive add on that was never popular with the Jelenko/ Jelrus burnout ovens because of the added expense compared to venting. I have venting system that is purchased seperately and can be connected to 2 burnout ovens. It has a cup device that sits ontop of the chimney and uses a small electric fan to draw out the gases. This is a low cfm fan, about 60cfm, and has a cooler air intermixer to cool down the exhaust an not damage the fan. The fan will run only when either of the ovens are running a cycle, otherwise it is turned off. 2. Power recovery both during a cycle and in standby - The current board design will recover from a power failure during a cycle. I am working on the software changes needed to have it recover while on a timed start. As this requires a real time clock and battery backup. 3. Door type - I believe the door will be a swing down type but am still looking at other methods. The reason why I lean towards a swing down door is: One, this is most cost effective way to build and still provide the left or right versatility. Two, Guillotine type doors are notorious for being knocked out of alignment and for wearing the inside insulation on the upper or leading edge of both the door and the chamber thus causing heat to leak from the top. These issues do not exist with a swing down door. 4. Muffle type - hot and cold spots, convection fan - This is a subject that is not discussed much. Hot and cold spots are as much a technical issue in burnout ovens as they are in a porcelain furnace. They are just gotten around more easily. However, I have chosen a muffle assembly that is similar to the old Ney 2000 burnout ovens. That is where the similarity ends. The coils wrap around the sides and the back giving 270 degree heat pattern. In other industries, this same muffle is used at heat rates to 100 degrees F p/m. I plan to limit it to 72 degrees F / 50 C thus extending its life by many years. The operating wattage is 1700 watts. While this size wattage is normally for a large oven, I have an inbetween size that has a slightly larger foot print than the medium ovens but has 2/3 more capacity. 5. Preprogramming different investment materials - I do not intend to have any preprogramming offered. There are sooo many different types of invest out there and than every tech has his or her variation to the best heating cycle not to mention the differences in ovens. Full retail for all of this is set to be about $1200. I welcome any questions or comments you may have and again, thanks for those already received. Daniel [/QUOTE]
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What features would you like in a burnout oven?
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