| Main Spar |
| November 7, 2007 |
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| Last time I was still updrilling holes to #21. Part way through I thought I better make sure I have an adequate way to dimple the Top Web for the #21 size hole. So before I finished updrilling, I decided to do some dimpling with practice pieces. |
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| WITHOUT dimpling, I drilled a #21 hole and placed a rivet in some scrap aluminum, the same size as the Top Web. |
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| Next I placed a countersink in some .125" aluminum. You can see some practice dimples I had already made earlier in the evening next to the rivet. |
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| Placed rivet into both pieces. |
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| Gave the rivet some VERY LIGHT shots with the rivet gun... no backing to the rivet at this point. Our goal is JUST to make a dimple in the Top Web using the rivet as our dimpler. |
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| This method produces a nice solid dimple ( you can see on the Left). The rivet is still sitting up (Proud) some, but after riveting, it should sit down flush. |
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| After making sure we had a way to dimple #21 holes, we finished updrilling the rest of the holes. Did I mention there are A LOT OF HOLES? |