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Thread: Plywood carcase with permanent shelf

  1. #1
    Join Date
    Dec 2006
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    Palm Beach Gardens, Florida
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    Plywood carcase with permanent shelf

    If I were to build a plywood carcase for a builtin cabinet with a face frame and wanted to have a permanent shelf in the center of this box what joint should I use for the plywood shelf? This cabinet will hold fairly heavy items for storage.

    Just a simple dado?

    Would adding a front edge add to the strength of the shelf? FWW magazine had an article about this, trying to locate the article now. Found it (M A R C H / A P R I L 2 0 0 7 page 39) but is mainly for solid wood shelving.

    Rough dimensions are 45"h x 30"w x 28"d.
    Regards,
    Bill Antonacchio

  2. #2
    Join Date
    Oct 2006
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    ozarks
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    what other aspects of the cabinet will support the shelf bill? if you`re going to use a faceframe and a back then setting a single piece of 3/4 into a dado will be strong so long as it`s not over 32" in width..be sure to glue the dados, faceframe and back to the shelf and you should be fine.....if you`re doing anything other than what i just discribed please post more details.
    [SIZE="1"] associated with several importers and manufacturers.[/SIZE]

  3. #3
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    Dec 2006
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    Palm Beach Gardens, Florida
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    Thanks Tod.

    Yes, I will use a face frame. Since you mention it, I thought I would used biscuits to attach the faceframe to the plywood edges of the box. That should be OK, right.

    For the back, HD has some thin luan sheeting that I was intending to rabbet into the back. Pin and glue this to the carcase.

    Does that sound strong enough?
    Regards,
    Bill Antonacchio

  4. #4
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    biscuits are fine for the faceframe to shelf joint but so is plain ol` glue .....the joint between the faceframe rail and styles is what`s going to make or break the strength of the shelf..for major weight,(over 150#) i`d either half lap or mortise-n-tennon that and the top-n-bottom corner joints.
    here are a coupla ways to do the shelf/faceframe joint that are stronger than biscuits

    Attachment 12734
    [SIZE="1"] associated with several importers and manufacturers.[/SIZE]

  5. #5
    Join Date
    Dec 2006
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    Palm Beach Gardens, Florida
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    Thanks again Tod,

    I see what you are saying, I think... Instead of attaching a wide edge to the shelf your sketch shows a cleat attached to the faceframe rail that the shelf can then be glued and screwed into, right? Or, in the second drawing I would have to figure out how to rabbet the rail before making up the face frame or having to do a blind rabbet after the fac3eframe is together?

    BTW I didn't intend to use biscuits to attach the shelf to the faceframe, just to attach the faceframe to the carcase (or plywood box edges) if I have my lingo correct!
    Regards,
    Bill Antonacchio

  6. #6
    Join Date
    Nov 2006
    Location
    Southern Louisiana
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    bill,

    in my experience, what you are planning to do is plenty good enough. if it makes you feel better you could always add a cleat at the back of the shelf as well.

    chris

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