DIY fireplace/oven





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  1. #1
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    Default DIY fireplace/oven

    Now that “Winter is Coming” I want to build my own fireplace with secondary combustion and glass door. Will 3CR12 be the best choice? , 5mm thick? Also have the number of the glass place that will make and temper the glass front. Anyone done this before? Why buy if you can make it yourself?

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  3. #2
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    Default Re: DIY fireplace/oven

    Hi

    I am in the process of making a masonry heater using the picture below. I started last winter and didn't finish and froze by butt off, so I'm finishing before this winter.
    This design has a re-circulation chamber so cleaner burn and less bad stuff into the atmosphere, but there are as many variations as there are nations on earth.
    This is more efficient than cast iron heaters simply because they have more mass, they take a long time to heat up but will radiate heat for many hours.
    Apologies if I say things you already know.

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    There is an inner part and an outer part. The inner part must be built on a layer of sand so it can expand and contract. The must be a gap between the inner and
    outer part as not to cause cracking in the outer part.

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    The brick laying is not the best as it's not my thing, metal fab is. The saw was a gift from a friend and now hangs in my workshop because my wife doesn't want it hanging above the fire place as per my suggestion.

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    I am making small steel doors for the openings on the side, these openings are for cleaning the flues.

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    I welded railway cleats (I don't know the proper name) together to make the T brackets to hold the sleeper.

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    I used 4mm mild steel plate for the door.

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    I got the glass from an old oven but I think you can use that glass for 3D printer beds www.3Dprintingstore.co.za .

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    I will put flexible fire cement between the metal parts and brickwork to create a seal.

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    Clearance must be left for the door to expand.

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    The wall at the back of the masonry heater divides the lounge and kitchen and is sort of central in my house, and should keep it warm.

    I don't know the answers to your questions but I hope this helps for something.

    Will post progress and again after first fire and let you know the results.
    Last edited by moseswal; 2019/04/05 at 11:50 PM. Reason: grammer

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  5. #3
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    Default Re: DIY fireplace/oven

    Hi

    Today I started with the bottom part of the chimney. This will sit on top of the brick work.

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  7. #4
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    Default Re: DIY fireplace/oven

    Did you use firebricks or clay bricks ?

  8. #5
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    Default Re: DIY fireplace/oven

    How do you achieve the inner part on sand? This looks ideal for the Karoo.

  9. #6
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    Default Re: DIY fireplace/oven

    Clay bricks, I figured it will be OK because the bricks are fired at a high temperature.

  10. #7
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    Default Re: DIY fireplace/oven

    I put a thin layer of sand on the slab and built on top of it.

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  12. #8
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    Default Re: DIY fireplace/oven

    Wow, I think you are too humble - that is a work of engineering proportion and very well finished off!
    Congratulations!
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  14. #9
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    Default Re: DIY fireplace/oven

    Hi

    Thanks Johan

    See the second part of the chimney tacked up.
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  15. #10
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    Default Re: DIY fireplace/oven

    To answer the OP's question, 3CR12 does not like heat. I guess it is still better than mild steel. I have a braai pan I've used for about 15 years made from 1.2 mm 304 stainless. I'd be inclined to use 1.6mm 304 grade stainless steel rather than 3.0mm 3CR12. I'm talking from my personal observations.

    That said I've also been looking at videos of the german/swiss/austrian "kachelofen" construction. Many of these have side benches built onto them. You can get them locally made for you at some 100k a pop. They have special bricks and cement with which to build these with. One point I've noted about these constructions is that they draw air from outside.

    https://www.youtube.com/watch?v=kPbprpfQGVY

    Note how after building the oven that he lights a smoke and checks the draw. It's very important that these fireplaces draw properly or you can release too much CO2 into the room. That could be a reason for drawing from outside - I'm not sure.

    The outer skin of these ovens are usually glazed ceramic tiles.








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  17. #11
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    Default Re: DIY fireplace/oven

    I seem welded the flues and made the damper.
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    I turned the bushes on the lathe. This one has a blind hole and is sealed.
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    I welded in a bar that stops the damper at 100% closed position.
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    The bar stops the damper at the 100% open position.
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    This section slips into the bottom section.
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    Last edited by moseswal; 2019/04/29 at 04:48 PM.

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  19. #12
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    Default Re: DIY fireplace/oven

    Ash box

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    Cutting the plates

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  20. #13
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    Default Re: DIY fireplace/oven

    Chimney top that will protrude through the roof. The flange is to bolt a tornado type cowl to it. That should help create a negative pressure in the flues that will be helpful for cold starts.
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    Getting ready to spray.
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  21. #14
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    Default Re: DIY fireplace/oven

    The ash box
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    Fitting the chimney
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    Mocking up the tornado
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  23. #15
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    Default Re: DIY fireplace/oven

    Looking good .Is this a one of or have you done a couple ?

  24. #16
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    Default Re: DIY fireplace/oven

    are you going to fit a door with a glass on that fireplace?

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  25. #17
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    Default Re: DIY fireplace/oven

    Hi

    This is the first one.
    There is a glass in the door.

  26. #18
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    Default Re: DIY fireplace/oven

    I installed the top part of the chimney, I need to seal it where it meets the roof.

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    I started making the horizontal flue doors.

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  27. #19
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    Default Re: DIY fireplace/oven

    More progress on the doors

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  29. #20
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    Default Re: DIY fireplace/oven

    Damn you are good with steel.


    Your build looks good

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