Darryl Keil Last Activity 2026-01-12 8:29 AM
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Kim Carleton Graves

 
Subject : Settle a bet: which way does bending ply bend?
Posted : 2000-10-15 8:37 PM
Post #30812
Hi Darryl,My shopmate, Kirk Schuly, and I have a bet (no money, but probably the winner can claim the other buys lunch) and you've been elected to settle the dispute.For a bent lamination, which way is bending ply supposed to bend? Do you want long grain or short grain on the outside? Long grain seems to gives a stronger panel but you get more springback. Short grain allows for a tighter curve (while still maintaining a balanced panel) and with almost zero springback. Of course, with solid, all plies would run long grain.Thanks, Kim Carleton GravesCarleton Woodworking



 
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TBB

 
Subject : Settle a bet: which way does bending ply bend?
Posted : 2000-10-21 1:25 PM
Post #30822 - In reply to #30812
My $.02 on your bet : bending stock is meant to be bent along the line of the short grain (assuming you are using 4x8's, and not 8x4's) - if you are going to do your laminations along the long grain of bending stock, the curve must be gentle enough to allow you to use less expensive material to build your laminations with, say 1/4" luan or 3/8" MDF, were you to be building up a substrate to be finished with veneeer. I have done much successful work with building large curved panels out of MDF with both Unibond and PVA adhesives.: Hi Darryl,: My shopmate, Kirk Schuly, and I have a bet (no money, but probably the winner can claim the other buys lunch) and you've : been elected to settle the dispute.: For a bent lamination, which way is bending ply supposed to bend? Do you want long grain or short grain on the outside? : Long grain seems to gives a stronger panel but you get more springback. Short grain allows for a tighter curve (while still : maintaining a balanced panel) and with almost zero springback. Of course, with solid, all plies would run long grain.: Thanks, : Kim Carleton Graves: Carleton Woodworking




 
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Darryl Keil

 
Subject : Settle a bet: which way does bending ply bend?
Posted : 2000-10-18 8:29 PM
Post #30815 - In reply to #30812
Dear Kim,Well, that all depends. If it is, lets say a tall quarter column, I would run the majority of the grain up and down, the straight way not over the curve. If, let say, its a long curved wall I would run the majority of the grain over the curve. When I say " the majority of the grain" I mean if using 1/8" bending ply which has two layers going the same way and one going the other. Actually I consider the best way to be, each layer of equal thickness going 90 degrees to the previous one. Unfortunately bending plys dont give you this option.Anyway, I think this means you both have to buy each other a lunch.SincerelyDarryl Keil: Hi Darryl,: My shopmate, Kirk Schuly, and I have a bet (no money, but probably the winner can claim the other buys lunch) and you've : been elected to settle the dispute.: For a bent lamination, which way is bending ply supposed to bend? Do you want long grain or short grain on the outside? : Long grain seems to gives a stronger panel but you get more springback. Short grain allows for a tighter curve (while still : maintaining a balanced panel) and with almost zero springback. Of course, with solid, all plies would run long grain.: Thanks, : Kim Carleton Graves: Carleton Woodworking
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