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Old 06-05-2018, 07:41 PM
BTromblay BTromblay is offline
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Default Beech Debonair access panels.

Hi,

A sheet metal project for a 1960 Beechcraft Debonair. The panels are spar inspection plates that mount under the pilot and co-pilot seats. The originals were bent up, cracked and damaged from years of abuse. Not a structural component, but critical as they keep debris out of the retractable landing gear system.
20160708_155012.jpg

Both panels made out of .040" 5052-H32 aluminum.
20160709_115847.jpg
20160709_120737.jpg

It's a deep draw, about 3 inches in the deep end of the pool.

I wish I had taken more photos of the form process, but I do have a couple. I had pre-stretched the area with the Pullmax, using a urethane dock bumper and a delrin lower doming die.
20170201_192513.jpg

Once I had the general shape, I wheeled out the dish area with the E-wheel. To finish the corners, I made a 3"dia ball roller for the English wheel. I have one of Peter Tommasini english wheels and I love it. One great feature is, I can adapt the machine for many different ideas. The ball bearing allows you to roll in any direction and great for finish work.
20170201_192617.jpg
20170201_192939.jpg

The ball bearing idea is from Cass Nawrocki Book "Any impossibility in shaping metal". If you don't have the book, get one, it's a great reference to have in your shop. I have a nice planishing hammer now, which I didn't have when I formed these panels. A P hammer, would have made the corners easier, but the ball and wheel worked fine as well.

To finish the panels, once the dish area was formed and wheeled out, I tipped the edge in a bead roller and trimmed to size. I don't have any photos of that process. I can post more pictures of the urethane die in the pullmax and the 3" dia ball for the e-wheel if anyone is interested.

Thanks for looking,

Bill
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  #2  
Old 06-05-2018, 08:49 PM
Onemorehammer Onemorehammer is offline
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Nice work Bill, Thanks for sharing your process, Dan
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Old 06-06-2018, 01:02 AM
longyard longyard is offline
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Really nice photos and explanation. Thanks Bill
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Old 06-06-2018, 06:05 AM
skintkarter skintkarter is offline
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Wow! Thanks for posting Bill. Really like the ball bearing idea. Does this just sit in a cup somehow?
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Old 06-06-2018, 07:08 AM
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Steve Hamilton Steve Hamilton is offline
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Hi Bill

Clean results, thanks for sharing the process

Steve
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Old 06-06-2018, 08:40 AM
Marc Bourget Marc Bourget is online now
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More pictures, please?


What, you couldn't find replacements at your corner Beechcraft Store? hahahaha!
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