Reply by splintergroup

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Posted on Dear plywood manufacturers,

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4135 posts in 2140 days

#1 posted 09-25-2020 03:35 PM

Even in “the good old days” when things were more consistent, I always got all the required plywood from the same batch and then sized my grooves appropriately. Royal PITA, but not much else that can be done. Alternatively, a small rabbet can be cut on the back side (router table) such that the portion that slips into the groove is of consistent thickness.

Each method either requires a lot of pre-planning or wastes a lot of time and opens up other avenues of aggravation 8^)

For tooling, I’ve also given up on getting the proper fit with one pass and instead size my cutters a tad under the minimum thickness needed (then make two passes).

My guess for the whole situation is as follows:
Ply manufactures make 3/4” (0.75”) plywood.
Router bit cabal makes 0.750” dado bits.
Ply mfg, makes undersized by 1/32”
Router bit cabal makes 1/32” undersized cutters
Ply mfd. laughs and makes random thickness sheets.
Router bit cabal makes variable diameter bit with bright anodizing and calls it a “system” for only $200
Ply Mfg. make thickness vary over entire sheet.

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