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Re: [hobbicast] Re: Fan-blown 3/8" funnel burner update

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  • michael.a.porter@comcast.net
    Carlos, I will be finishing up two different construction schemes on the 3/8 size burner over Thanksgiving weekend, and presenting one of them to the group
    Message 1 of 17 , Nov 21, 2012
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      Carlos,
      I will be finishing up two different construction schemes on the 3/8" size burner over Thanksgiving weekend, and presenting one of them to the group for construction early next week.
      Mikey

      ----- Original Message -----
      From: Carlos Contreras <maximo64@...>
      To: hobbicast@yahoogroups.com
      Sent: Tue, 20 Nov 2012 22:29:11 -0000 (UTC)
      Subject: Re: [hobbicast] Re: Fan-blown 3/8" funnel burner update













      Dear Michael,





      Many thanks for your answer, hoppe other members are happy with this project that you are handling it will be a fantastic inprovement in the Hobby cast devices I think. specialy if melt iron will be no more difficult.





      all the best




      ________________________________


      De: "michael.a.porter@..." <michael.a.porter@...>


      Para: hobbicast@yahoogroups.com


      Enviado: Martes, 20 de noviembre, 2012 10:51:47


      Asunto: Re: [hobbicast] Re: Fan-blown 3/8" funnel burner update








      Carlos,


      I've already built and tested this burner in 1/4" size. It is now attached to a coffee-can furnace in Portland. I'm nearly finished with two different 3/8" models, and expect them to run exactly the same as the smaller size. These burners are both naturally aspirated and fan blown; they will run in either mode. When naturally aspirated, they run just as well as my high speed tube burner series, which is no surprise, as miniature burners (3/8" and smaller) of all types have an excess of potential that must be tamed a bit. Unfortunately, so far this burner series is just as much work to construct as my tube burner designs :-(



      So, if these linear burners run so hot already, why put a blower on them? The answer is MORE. A burner's total potential is limited by its nozzle diameter (a flame can be fine tuned just so much before you blow it right off the nozzle's end), but the excess air provided by a blower can be matched to a larger nozzle, thereby allowing a great increase in turn-down range. Or to put this another way, by building two different nozzle sizes instead of one, it's like have two different burner sizes available in one burner, with perfect flame performance available throughout a very wide heating range. Since, I've already found two different burner sizes to be handy on furnaces; ex, 1/4" and 3/8" for collee-can furnaces; 3/8" and 1/2" got two-gallon furnaces; 1/2" and 3/4" for five-gallon furnace size.



      Note: This burner series has no resemblance in its flame output to ducted fan-blown burner systems previously used by hobbyists to build their heating equipment; for practical purposes, such systems can be described as employing the equipment interior as the burner, which always amounts to very inefficient flame use.



      Soooo...do we finally have the perfect burner at last? No; these burners are going to be somewhat superior in casting furnaces, but can't be employed at all in much other equipment (ex. most tube forges).



      ----- Original Message -----


      From: Carlos Contreras <mailto:maximo64%40yahoo.com.mx>


      To: mailto:hobbicast%40yahoogroups.com


      Sent: Tue, 20 Nov 2012 00:49:23 -0000 (UTC)


      Subject: Re: [hobbicast] Re: Fan-blown 3/8" funnel burner update



      Hi everybody,



      finaly did you builkd the 3/8 burner.? or what is the status on this good project for every hwo want melt iron in small quantity.



      all the best thabks in advance for your comments



      ________________________________



      De: "mailto:michael.a.porter%40comcast.net" target=_blank>mailto:michael.a.porter%40comcast.net" <mailto:michael.a.porter%40comcast.net>



      Para: mailto:hobbicast%40yahoogroups.com



      Enviado: Domingo, 21 de octubre, 2012 15:23:23



      Asunto: Re: [hobbicast] Re: Fan-blown 3/8" funnel burner update



      Five and twelve volt blower fan cases are made of ABS plastic, so securing them to hand made metal forms before attachment to metal funnel shapes isn't going to improve their strength at all. So, why not use ABS rated glue and plastic to attach the blowers? On top of other factors, both short and full length hip-flask funnels have protruding rims at their large ends, which will allow a glue/plastic paste mixture to be painted over the funnel rim, so as to form a convenient air tight ring from plastic disk edge, to curve over and around the metal rim. Homemade ABS pastes can even be cold cast if desired (gentle hint; wax mold).



      You can make your own ABS adhesive paste by melting down ABS shavings and small chunks in acetone, which is the solvent used in the commercial products. ABS adhesives and cements are available at local hardware stores and online:



      Eplastics.com sells a number of different ABS adhesives and cements with different consistencies, along with dispensers, at reasonable prices: http://www.eplastics.com/Plastic/ABS-Glue" target=_blank>http://www.eplastics.com/Plastic/ABS-Glue



      Fast-setting, medium viscosity ABS cement: globalindustrial.com/p/plumbing/plumbing-chemicals-compunds/cements-and-sealants/abs-cement-low-voc-for-abs-pipe-fittings-1-qt?utm_source=google_pr&utm_medium=cpc&utm_campaign=Cements-Sealants-google_pr&infoParam.campaignId=T9F&gclid=CIa8z6nqkrMCFSmCQgod0yoAGg" target=_blank>http://www.globalindustrial.com/p/plumbing/plumbing-chemicals-compunds/cements-and-sealants/abs-cement-low-voc-for-abs-pipe-fittings-1-qt?utm_source=google_pr&utm_medium=cpc&utm_campaign=Cements-Sealants-google_pr&infoParam.campaignId=T9F&gclid=CIa8z6nqkrMCFSmCQgod0yoAGg



      Fast-setting, medium viscosity ABS cement: pexsupply.com/Hercules-60513-1-2-pt-Medium-Body-Fast-Set-ABS-Cement-Black?gclid=CMTsvJvrkrMCFYaDQgodEE8ACA" target=_blank>http://www.pexsupply.com/Hercules-60513-1-2-pt-Medium-Body-Fast-Set-ABS-Cement-Black?gclid=CMTsvJvrkrMCFYaDQgodEE8ACA



      Note: Acetone is quite volatile, even when mixed with plastic; keep container of paste covered when not in use.



      Warning: Acetone is highly flammable; it is also a skin and eye (contact) irritant, toxic if ingested, or inhaled for long. Repeated or prolonged exposure to acetone can produce central nervous system and organ damage; carefully read and follow the manufacturer’s printed instructions, to be found on every container.



      ----- Original Message -----



      From: michael a porter <mailto:michael.a.porter%40comcast.net>



      To: mailto:hobbicast%40yahoogroups.com



      Sent: Sun, 21 Oct 2012 13:57:02 -0000 (UTC)



      Subject: Re: [hobbicast] Re: Fan-blown 3/8" funnel burner update



      I've been considering various ways to attach plastic blower fans to metal funnel shapes. Dan proposed anchoring screws between hip-flask cups and Sparkfun blowers more dependably in the thin plastic walls of the blowers by using ABS rated glue. Tick-tock, a day went by and suddenly I saw the obvious.



      The blowers are plastic, and securing them to hand made metal forms before attachment to funnel shapes isn't going to improve their strength at all. So, why not use ABS rated glue and plastic to attach the blowers? On top of other factors, both kinds of hip-flask funnel have protruding rims at their large ends, which will allow a glue/plastic paste mixture to be painted over the funnel rim, to form a convenient air tight ring from plastic disk edge, to curve over and around the metal rim.



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