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RV-7 Construction Log
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Date:  5-5-2013
Number of Hours:  5.80
Manual Reference:  p 8-2
Brief Description:  2 - F-704 Center Section Bulkhead

While letting the primer on the firewall parts cure one more day, got started on the F-704 Center Section Bulkhead.

I started by enlarging the holes for snap bushings. Two of the holes in each of the center section webs, and the one in each of of the four uprights had pilot holes, so they went quickly. The two closest to the centerline of the webs, however, had to be laid out. I took plenty of time laying these out and checking multiple times before committing drill to metal. I definitely do NOT want to screw these up. After drilling with a unibit, I primed the bare aluminum in the 12 holes with my regular duplicolor primer and a cotton swab (photo 1).

I then aligned and final drilled the uprights to the center section webs. On the first one I tapped the bolts in for alignment from behind. This was a mistake, as it took quite a while to work the bolts back out. For all the rest, I put them in from the web side just far enough to align the uprights.

After drilling and deburring the uprights, I located and clamped the F-704G shear bars in place and drilled their rivet holes. The 704 bulkhead assembly was too large and awkard to mount in the drill press, so I used a square to make sure the hole gets drilled square to the bar (photo 2). Worked perfectly!

I finished up the evening by drilling and deburring the F-633 control column per plans and instructions (photo 3).
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I primed the edges of the snap bushing holes.

I primed the edges of the snap bushing holes.

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Left shear bar clamped in place, ready to drill.

Left shear bar clamped in place, ready to drill.

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F-633 control column mount clamped and ready to drill.

F-633 control column mount clamped and ready to drill.

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