Reply by Woodknack

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Posted on Good wood for wood geared clock?

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12778 posts in 2744 days

#1 posted 08-12-2016 06:01 AM

Baltic birch plywood for the gears. The torque on some of the gears is tremendous
- johnstoneb

If there is enough shear to break solid wood then commercial plywood is the last thing you want to use as it is weak in shear along the plys. That’s why turners don’t use it for faceplates or it will delaminate. And why OSB is recommended as better for sheathing than ply. And why OSB is used in engineered wood i-beams instead of plywood. Tremendous torque in a plywood gear would delaminate the plies. I’m not saying plywood wouldn’t work or isn’t ideal but stability, not strength, would be the reason for choosing it. I like the idea of segmented rings for gears, or a homemade plywood.

-- Rick M,

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