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RV-7A Construction Log
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Date:  8-19-2008
Number of Hours:  2.00
Manual Reference:  
Brief Description:  Spar - Countersink holes for #8 bolt for Platenuts

I had to depart from using Van's method to countersink. They state to use the platenut as the guide for the countersink pilot. But I found there to be too much play and the bit chattered and ruined the countersink. So I used an angle of aluminum as a back plate and that made smooth countersinks.
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Chattered using Van's instructions

Chattered using Van's instructions

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Used Aluminum back plate

Used Aluminum back plate

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Smooth using aluminum back plate

Smooth using aluminum back plate

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