Win a copy of The Prairie Homestead Cookbook this week in the Cooking Forum forum!
  • Post Reply Bookmark Topic Watch Topic
  • New Topic
permaculture forums growies critters building homesteading energy monies kitchen purity ungarbage community wilderness fiber arts art permaculture artisans regional education skip experiences global resources the cider press projects digital market permies.com private forums all forums
this forum made possible by our volunteer staff, including ...
master stewards:
  • Nicole Alderman
  • r ranson
  • Anne Miller
  • Pearl Sutton
  • James Freyr
  • Mike Haasl
  • paul wheaton
  • Dave Burton
stewards:
  • Joylynn Hardesty
  • Jocelyn Campbell
  • Joseph Lofthouse
garden masters:
gardeners:
  • Carla Burke
  • Steve Thorn
  • Eric Hanson

Making a mold for the core

 
pollinator
Posts: 407
72
food preservation cooking homestead
  • Mark post as helpful
  • send pies
  • Quote
  • Report post to moderator

I want to make a mold for making rocket oven cores with air crete for Peter's  Van design.


I am curious where I can find more information about the molds made that have been tested.


I am trying to think thru the best way of making this, as a plywood form or if there is a better material / method.

Mart
core177-3part.jpg
[Thumbnail for core177-3part.jpg]
 
gardener
Posts: 2422
Location: latitude 47 N.W. montana zone 6A
351
cat pig rocket stoves
  • Mark post as helpful
  • send pies
  • Quote
  • Report post to moderator
Hi Mart;   I used 1/2" plywood on my core. I have seen plenty of photos of people using osb  board.  Its removable, so what ever you have on hand that is strong enough should be fine.
 
Mart Hale
pollinator
Posts: 407
72
food preservation cooking homestead
  • Mark post as helpful
  • send pies
  • Quote
  • Report post to moderator
Thanks for the reply.

I think then starting with a rectangular box then cutting a foam filler to go inside would do the trick?

As I look at this, I am wondering about doing multiple pours to get the shape.     Hmm perhaps putting the rectangular box on end might be better.

 
pioneer
Posts: 215
Location: The Arkansas Ozarks
25
cat dog forest garden rabbit building solar rocket stoves woodworking wood heat homestead
  • Likes 1
  • Mark post as helpful
  • send pies
  • Quote
  • Report post to moderator
Hi Mart,

I am just curious what you are going to do to the aircrete so that it will survive the 2000+ deg F temperatures in parts of the stove.  I have looked at using aircrete in some concetual designs but have not yet overcome that obstacle.  Thanks.
 
Mart Hale
pollinator
Posts: 407
72
food preservation cooking homestead
  • Mark post as helpful
  • send pies
  • Quote
  • Report post to moderator

Ralph Kettell wrote:Hi Mart,

I am just curious what you are going to do to the aircrete so that it will survive the 2000+ deg F temperatures in parts of the stove.  I have looked at using aircrete in some concetual designs but have not yet overcome that obstacle.  Thanks.





I have 3 options as I look at, my first is to use ceramic fiber for both the chimney and the interior, I have found I can mold the ceramic fiber when combined with sodium silicate and water and it holds its form.

The second is to make the form to use firebrick inside the mold, using the mold so that the interior is firebrick the outer shell is aircrete.


The third is I have bought a refractory mix from "The Honey Do carpenter" off Etsy that he has found to work with his rocket stoves.


I have bought extra material, and my initial results with the ceramic fiber shows me that  my first plan should work just fine,     I do not plan on putting this in my home, but for an outside oven use so  I am prepared if this does not work, but all of my research tells me that I am moving in the right direction.      

I think I will make a few chimneys with the different mixtures and test them, I let the results direct my path.


Cheers,

Mart
 
Ralph Kettell
pioneer
Posts: 215
Location: The Arkansas Ozarks
25
cat dog forest garden rabbit building solar rocket stoves woodworking wood heat homestead
  • Mark post as helpful
  • send pies
  • Quote
  • Report post to moderator
Hi Mart,

Did you buy a foam mate from him? Are you going to support his kickstarter?  We should probably take this private.  I had some ideas and I wanted to run something pay him as an additional business op and he never even emailed me back.
 
gardener
Posts: 655
Location: +52° 1' 47.40", +4° 22' 57.80"
75
woodworking rocket stoves wood heat
  • Likes 1
  • Mark post as helpful
  • send pies
  • Quote
  • Report post to moderator

Mart Hale wrote:
I want to make a mold for making rocket oven cores with air crete for Peter's  Van design.
I am curious where I can find more information about the molds made that have been tested.


Hi Mart,
All my casted experiments were done in a coated plywood or white melamine MDF box. All the sculpting was done with extruded polystyrene foam, made to size and shape with a table saw and smoothed by hand.

The foam parts were glued into place using double-sided adhesive tape, the kind that is used for fixing carpet edges to the floor. Any crack was sealed using acrylate sealant so no cement water leaked behind the foam parts. In fact, the pictured core is done like that.
 
Mart Hale
pollinator
Posts: 407
72
food preservation cooking homestead
  • Mark post as helpful
  • send pies
  • Quote
  • Report post to moderator

Peter van den Berg wrote:

Mart Hale wrote:
I want to make a mold for making rocket oven cores with air crete for Peter's  Van design.
I am curious where I can find more information about the molds made that have been tested.


Hi Mart,
All my casted experiments were done in a coated plywood or white melamine MDF box. All the sculpting was done with extruded polystyrene foam, made to size and shape with a table saw and smoothed by hand.

The foam parts were glued into place using double-sided adhesive tape, the kind that is used for fixing carpet edges to the floor. Any crack was sealed using acrylate sealant so no cement water leaked behind the foam parts. In fact, the pictured core is done like that.



Thank you Peter!

 
Mart Hale
pollinator
Posts: 407
72
food preservation cooking homestead
  • Mark post as helpful
  • send pies
  • Quote
  • Report post to moderator

Ralph Kettell wrote:Hi Mart,

Did you buy a foam mate from him? Are you going to support his kickstarter?  We should probably take this private.  I had some ideas and I wanted to run something pay him as an additional business op and he never even emailed me back.




I bought his plans for his small foam mate which I am up-scaling to be a larger one.

Feel free to private message me.

What I am doing is highly experimental, so I hate anyone to follow in my untested footsteps ;-)       In the tech industry we called this bleeding edge technology as you often made mistakes
along the way.
 
Without subsidies, chem-ag food costs four times more than organic. Or this tiny ad:
holiday shopping for 2019
https://permies.com/t/128446/holiday-shopping
  • Post Reply Bookmark Topic Watch Topic
  • New Topic
Boost this thread!