Cramer
Junior Member
Posts: 129
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Post by Cramer on Jan 20, 2014 16:08:35 GMT -8
Hey Max, I recall it vaguely. That is a batch box though. Does it use the kind of riser I was talking about? Maybe you were going to post the thread and not just the sketchup?
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Cramer
Junior Member
Posts: 129
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Post by Cramer on Jan 19, 2014 17:37:06 GMT -8
Looks like I am going to form my own riser. Just cannot find one with the correct inside diameter and length required. I am ordering 2" Cerablanket and rigidizer. I will coat both sides of the insulation blanket and form 2 half cylinders (6 inch ID, 10 inch OD) and dry them in a vacuum box using a vacuum pump that will pull to 500 microns with fresh oil. The two halves will be encased by a piece of 10 inch duct to hold them firmly together. Anyone see anything wrong with this plan?
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Cramer
Junior Member
Posts: 129
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Post by Cramer on Jan 19, 2014 15:30:12 GMT -8
Wolf, I will sure like to see the finished product!
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Cramer
Junior Member
Posts: 129
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Post by Cramer on Jan 19, 2014 15:08:41 GMT -8
Feed tube way too long. Nice sketchup Max, that could work if there is enough vertical height.
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Cramer
Junior Member
Posts: 129
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Post by Cramer on Jan 19, 2014 7:24:19 GMT -8
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Cramer
Junior Member
Posts: 129
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Post by Cramer on Jan 18, 2014 21:10:45 GMT -8
Mrtraveilingman, the one thing you don't see on youtube is the failures of metal "rockets" that many people have made. People, as a rule do not post their failures. Max is only trying to save you the heartache of putting in valuable time building something that will most assuredly fail. You may think him a bit harsh in the way he says it but that does not discount the truth in his words. If you want to build it with full knowledge that it is expendable and for test purposes (I did one with materials I knew would fail after a few burns so I am the voice of experience here, as is Max) then please do. When you learn what works and what does not then build your more permanent version with the full knowledge that the materials WILL last. I like the idea of the heat exchanger and if you find a way to make it work that would be great. But when you insulate the burn tunnel and the heat riser and you do have a rocket, the metal will without doubt fail.
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Cramer
Junior Member
Posts: 129
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Post by Cramer on Jan 18, 2014 20:43:01 GMT -8
Thanks Donkey. Since the burner is going to be cast it should be no problem to have a smooth transition from square (with a CSA of a 6 in round) to round 6 inch. It will be a tough one to figure out how to incorporate a P-Channel and a trip wire into the round burn tunnel but I am sure that I can figure out just how to do that before the cast.
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Cramer
Junior Member
Posts: 129
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Post by Cramer on Jan 17, 2014 16:06:33 GMT -8
Thanks Trance. I think the burn tunnel will be round out of necessity because of the angled riser. I don't see a good way to have a square or rectangular burn tunnel turn to accept an angled riser. The question is the CSA of a square feed to a round tunnel. 6X6 feed or match the feed CSA to the CSA of the round tunnel?
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Cramer
Junior Member
Posts: 129
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Post by Cramer on Jan 16, 2014 17:46:57 GMT -8
I got mine!
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Cramer
Junior Member
Posts: 129
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Post by Cramer on Jan 16, 2014 16:05:36 GMT -8
Thanks Matt, I have actually been looking at different ways to "skin this cat". (I often wonder how the colloquialisms we use are regarded by our friends across the pond). I was able to speak with someone today who actually knows something. That was refreshing. In case anyone wants to know the technical name for those things you and Peter use they are called "vacuum formed insulating riser sleeve". There are two types of riser sleeve. There is the type you have and an exothermic one which creates heat while also maintaining the temperature of the poured metal resulting in fewer impurities reaching the casting. I don't know if you live in an area where there are foundries but the intended use for these is to insulate a "riser" which is the place where molten metal flows into a mold. The closest foundry to me is around 200 miles away which is the reason they are so difficult to find around here. Interesting stuff.
The helpful person at Joe Moore Company in Raleigh said he could quote one for me but they do not keep them in stock at his place. He asked that I send a "sketch up" file so that he knows exactly what I am looking for and even indicated that they could form the mold and pour and cure the burner and feed for me if I wanted. I know that would probably be costly but I figure it would not hurt to get a quote. He even offered their service to pour and cure my already made mold if I would like them to.
Not really hung up on it but I love researching things I know nothing about.
I will let y'all know about progress as it occurs but it may be a little while as I will need some time off my "regular" job to get it all fleshed out.
Back to the feed tube/burn tunnel question: Should one mold a square feed transitioning to a round tube maintaining the CSA of the tunnel or would it be okay (like square tunnel to round riser) to have a 6x6 feed attached to a 6 inch round tunnel? Never got a definite opinion on this yet and before making the mold it would be good to know. Thanks again!
Cramer
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Cramer
Junior Member
Posts: 129
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Post by Cramer on Jan 16, 2014 3:28:03 GMT -8
Thanks guys! There is a place in Raleigh NC (I called them and they had no idea) I found many refractory pipe insulation (none of their working temperatures were high enough. Maybe my search term was too specific but I have always been able to find whatever I needed near here by using Raleigh as the city in search. I will keep trying Because until I know my riser I can not make the mold.
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Cramer
Junior Member
Posts: 129
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Post by Cramer on Jan 15, 2014 16:08:44 GMT -8
I have seen many times a brick feed and burn tunnel transitioning to a round riser, I just don't ever recall seeing a round burn tunnel and riser and a square feed. I am assuming a 6X6 square FEED transitioning to a 6 round BURN TUNNEL and of course RISER would be okay since the 6X6 feed is not that much different in CSA to the tunnel.
I have been searching all day (on-line) for one of those risers like Matthew has but so far have been unable to find one. Matt, if you see this, could you let me know who your supplier was so that I might find out the manufacturer and see if they have a distributor in my area?
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Cramer
Junior Member
Posts: 129
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Post by Cramer on Jan 14, 2014 18:42:36 GMT -8
Any problem with casting a square feed tube transitioning to a round burn tunnel? The round burn tunnel would best match with the angled riser but a square feed tube would better hold sticks of wood I think. I don't recall ever seeing anyone doing this though so I wonder if there is a reason for it.
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Cramer
Junior Member
Posts: 129
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Post by Cramer on Jan 14, 2014 15:23:01 GMT -8
Got it!
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Cramer
Junior Member
Posts: 129
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Post by Cramer on Jan 14, 2014 3:58:51 GMT -8
So, add O2 then interrupt laminar flow?
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