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Rockin

Two Spines

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Hi Al:

I have a blank that has two very equally pronounced spines. A Stress test under a 5 and 10 pound load reveals they are identical. Where should I place the spine and which spine should I use? Should I place the side that has the thicker wall(at the butt) on top? Should I turn it 90 degrees and build it on the side? Is this a desirable characteristic for a blank to have or is this a manufacturing flaw? The blank will be spiral wrapped. Please help. Thanks.

Rockin

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Rockin,

 

If you are using a spine finder tool one of the spines should be more prominent. If you are rolling it to find the spine, where the blank comes to rest when loaded the spine will be on the outside of the curve.

 

Al

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Al:

Thanks for responding so quickly. Maybe my question isn't clear enough. The blank has 2 spines exactly 180 degrees opposite each other and they static test to equal tolerances under a load. Does this make any sense? Thanks.

Rockin

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Hey Rocky,

 

If both spines exhibit the same resistance, take either one. If one is stronger than the other, I would take the stronger one. You are really lucky to have the spines on opposite sides.

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