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Thread: suggestions for a door that warps??

  1. #1
    Join Date
    Feb 2017
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    Default suggestions for a door that warps??

    I built a oil barrel arch last year and it worked great, but this year I made some changes such as put it in a building, took the glass out of the door and insulated the entire door, painted it black. This year during our first boil, we had it really boiling and the door warped so bad it was a struggle to close it each time. The bottom warped out 3/4". When we closed it the latch would just grab and then as we pushed the latch down it would bend the door back in. I would have thought that putting insulation on the whole door would have been the right idea, but maybe i'm missing something. It warped some last year too, but never this much. I attached a picture of how it is insulated now, vs last year with the glass. It has AUF too. Any thoughts would be greatly appreciated. Thanks
    Attached Images Attached Images
    2016-two straws stuck in tree by the kids-1 pint syrup
    2017-40 taps 8 gal. syrup
    2018-70 taps...19 gal syrup
    2019-90 taps....18.5 gal syrup
    2020- 100 taps....25 gal syrup.....new oil barrel arch
    2021- 85 taps....unknown season

  2. #2
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    Oneida NY
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    A couple of questions, is that door a pre-made cast door, or one you made out of mild steel? How much of an air inlet do you have, it looks like just a real small round one. How full do you put the wood?
    The wood should be split wrist size, and only filled to about 6" below the pan. Then it should have an air inlet of about the same sq. inches as the stack. I don't know how insulating the door made it warp worse but somehow it must have held or directed the heat to the door.
    That being said, It's likely not a problem, the warp is letting more air in for a hotter burn. Just make sure hot coals can fall out and light something near by and cause some extra excitement.
    Dave Klish about 400 taps, down from much more. Retired from collecting and boiling in 2021. Mostly because of a bad hip.
    2012 Mahindra 36 HP 4x4/ loader/cab/heat/AC:-)
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  3. #3
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    Feb 2017
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    Wisconsin
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    The door is a homemade door from mild steel with an angle iron frame and a plate steel face. The draft that you see is small but I also have a squirrel cage fan forced draft that is plumbed in the bottom. I was running close to 20 GPH when it was warped up so bad. We burn seasoned pine, split wrist size. we have a timer set to fire the stove every 6 minutes and fill the firebox to the top of the door. There is no question it is burning hot, maybe too hot I guess. Do you think its possible that the heat is following the bolts that hold the insulation on back to the door and are doing something goofy that way. Last year we had round stock welded inside the frame to hold the insulation in so no heat could get transferred to the door except by the glass. Maybe by having the cutout for the glass it provided enough relief that the door could move w/o warping, now being solid it has to warp since there's not room in the middle to move????? What do you think.
    2016-two straws stuck in tree by the kids-1 pint syrup
    2017-40 taps 8 gal. syrup
    2018-70 taps...19 gal syrup
    2019-90 taps....18.5 gal syrup
    2020- 100 taps....25 gal syrup.....new oil barrel arch
    2021- 85 taps....unknown season

  4. #4
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    MA
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    Is it possible that it's the front of the arch that is warping rather than the door?
    60ish taps on buckets
    D&G Sportsman 18x63
    Turbo RB15 RO Bucket
    Stihl 044 and 026

  5. #5
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    Mar 2017
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    Oakville, ON
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    When you heat a piece of steel with that surface area it is going to warp as the steel has to expand somewhere. When the glass was there only the width of the frame had to expand and that was likely mostly absorbed by the fit of the glass. Dont think you'll get a solid steel door to not warp. Cast iron has a lower coefficient of expansion so might be an option.
    2021 - 84 taps, 50L from 2100L
    2020 - 100 taps on buckets, 21L syrup from 2700L so far (FEB 26-Mar 13) and then the pandemic hit! End of our season!
    2019 - 62 taps on buckets, 95L syrop from 3215L sap
    2018 - 62 taps, collecting by hand, 90L syrop from 3200L sap
    2017 - Lapierre Waterloo Small mini pro with 40 taps
    2014 - 2016 40 taps making one or two batches on a 2x6 flat pan over an open arch as it would have been done in 1900

  6. #6
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    Feb 2017
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    Wisconsin
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    So maybe my best bet would be to cut a large rectangle out and then rather than replace it with glass replace it with a floating piece of steel. Then insulate the whole door, but this would allow it to act similar to a wooden cabinet door with the panel floating free inside the frame. Then the main piece of steel will still have room to shrink and grow without warping the door. What do you think?
    2016-two straws stuck in tree by the kids-1 pint syrup
    2017-40 taps 8 gal. syrup
    2018-70 taps...19 gal syrup
    2019-90 taps....18.5 gal syrup
    2020- 100 taps....25 gal syrup.....new oil barrel arch
    2021- 85 taps....unknown season

  7. #7
    Join Date
    Jan 2017
    Location
    Williston, VT
    Posts
    322

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    Weld some 1x1 angle on to stiffen the door in the direction it wants to bend. It would be a diagonal and make it symmetric with another brace to the other corners.
    Last edited by TapTapTap; 03-06-2021 at 06:30 AM.
    Ken & Sherry
    Williston, VT

    2017 - 13 gallons on 65 taps (12 buckets, rest 3/16), 2x4 flat bottom, modified cargo box sugarhouse
    2018 - 90 gallons on 418 taps (gravity lines), Leader 30"x10' Vortex Arch & Max Raised Flue with Rev Syrup Pan, New Sugarhouse
    2019 - Burned through alot more money: heated kitchen, 2x2,000 and 375 gal ss sap tanks, CDL1200 RO, Bauch Vac Pump, More taps, etc., etc., etc.
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  8. #8
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    Mar 2015
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    Esko,MN
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    I use mild steel 3/16" thick, welded some regular nuts on the door then cut and screwed some threaded rod into the nuts. I then put 4" of insulation blanket on the door and used stainless fender washers and nuts to hold the blanket No warping after four years.
    Chad

    2014: 12 taps, 5 gal buckets
    2015: 15 taps on bags
    2016: 150 taps: 100 on bags, 50 on 3/16" natural vac, 2x8 AUF/AOF Homebuilt Arch, 2x8 SL Drop Flu & Auto Draw, SL Propane Canner/Bottler
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    2020: 175 taps
    2021: 300 taps, homemade RO and releaser

  9. #9
    Join Date
    Feb 2017
    Location
    Wisconsin
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    39

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    Thanks for the replies. I will try the angle iron diagonally first and see how that goes. I dont have the space in my firebox for 4" thick insulation but i can see that this would work too. I won't have a chance to make the change for a week yet so ill try to hold the boil a little cooler till then so i dont do permanent damage. Thanks again.
    2016-two straws stuck in tree by the kids-1 pint syrup
    2017-40 taps 8 gal. syrup
    2018-70 taps...19 gal syrup
    2019-90 taps....18.5 gal syrup
    2020- 100 taps....25 gal syrup.....new oil barrel arch
    2021- 85 taps....unknown season

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