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RV-7A Construction Log
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Date:  10-14-2008
Number of Hours:  3.00
Manual Reference:  
Brief Description:  Tank Prep - Joint Plate Dimple Drill Countersink 1

I am done preparing the tanks, but don't have any proseal so while I wait for it to arrive from Van's I prepared the Joint Plate T-423. There is not much about these in the mfg plans, but lots of info on other builders websites. First I decided it was important for the platenuts to be centered on the dimple and hole. So I cut a short screw and used it to screw in a platenut for drilling, countersinking and riveting. But first I dimpled skin rivet holes with #40 and the screw holes with #8. Then I screwed on the plate nut and drilled the rivet holes. I have the new 1097 rivets which have a 3/32 shaft but a very small head. So rather than dimple the rivet holes I countersunk them. It didn't take much. About 12 turns with the deburr tool or countersink bit.
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Cut off screw and platenut for drilling and riveting

Cut off screw and platenut for drilling and riveting

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Drilling rivet holes with platenut securely centered

Drilling rivet holes with platenut securely centered

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Countersinkig rivet holes

Countersinkig rivet holes

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