3/16 bend radius?

The good news is that I now have access to *two* brand-new CNC-controlled bending brakes, and have the training to use them.

The bad news is that the smallest bend radius in the tooling set is 3/16" (4.8 mm).

Since I am building from plans, can I substitute this bend radius? Are there any parts in the Cruzer that will suffer from fit and/or performance?

Thanks all.

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Permalink Reply by Earnest Fontenot on November 20, 2019 at 4:00pm

Brian,

Look at FAA publication AC 43.13-1B, page 4-14.
The table gives bend radii for different alloys in terms of sheet thickness.

Earnie

Permalink Reply by Damon Brantley on November 22, 2019 at 11:23am

If you find you can not substitute the bend radius, you may be able to use 3D printed dies. It is not common yet, but from articles I have seen it appears to work for short runs.

Permalink Reply by Russell Johnson on November 22, 2019 at 11:59am

something you might try, using a piece of light alum angle extrusion, use a router to get the radius you want, tape it to the 3/16" die using double sided tape. It would be best to polish the face of the angle after routing and coat the bending surface with a lubricant to keep the bending die and the alum sheet from galling.

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