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Beam (shelf) deflection

kmealy
kmealy
in General Woodworking

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The strength of a beam is proportional to the cube (third power) of its height.

 

image.png.48611d2a91cff3f6b940384778b453cd.png

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    Part of the "magic" is then knowing the anticipated loads, and the strength and deflection characteristics of the material.  Especially with wood, this can be difficult to pin down because the material can vary even within the same tree.

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    for 3/4" ply, 24" span is my max.  for like book shelves.

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    22 hours ago, DAB said:

    for 3/4" ply, 24" span is my max.  for like book shelves.

    Hey DAB, good to see you checking in again. Hope all is well?

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    On 9/19/2025 at 1:41 PM, Grandpadave52 said:

    Hey DAB, good to see you checking in again. Hope all is well?

    doing fine.

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