disscussion carried over from the blog site regarding my problem with forming my flaperon spars.I will get some pics of the spars and my bending brake

Views: 1043

Reply to This

Replies to This Discussion

Hi Dwayne,
The problem is that the bending brake opens up in the middle. You wil see that most bending brakes have an arrangement too put pressure on the middle of the break (see the picture).

See also http://www.ch601.org/tools/brake_plans.htm
Here is another link to make a simple, cheap but good working brake: http://www.ch601.org/tools/bendbrake/brakeplans.pdf
I made a bending brake like that but I replaced the steel angle wit aluminum ones because the steel ones at the local shop were not straight enough.

The bolts you see all along the upper angle keep it firmly to the base. There must be enough distance between the bolts and the edge to allow room for the flanges of the spar.
Remove some bolts if you want to bend larger pieces.

When I wanted to bend 0,032 sheets I had to replace the piano hinge with an array of stronger hinges.

The bending of the 0.040 angles for the fuselage was done by a friend of mine at a metal workshop.
I found bending the biggest problem to overcome for plans builders. The good thing about plans building a Zenair plane is that you have always the otion of buying those parts individually from them.
Hope this will be of some help.
Hi Henri
I agree with what your saying,I thought that on my first one the brake form may have moved.I used four c-clamps in the middle and four woodworking clamps towards the edge and I sucked them down as tight as possible.On my later bends I flipped the blank over to counter the roll as it was shipped to me rolled and the last three spars where nice and straight.Thats the only difference between the first and consecutive spars.I think the first one slipped in the middle,causing the bow.
By the way,nice brake.I have the prints for the one from Mark T. but I would have to get some one to weld it and haven't looked into what that would cost me.I ran into the same problem with steel angle as well,couldn't find a straight enough piece,never thought about aluminum angle.
Thanks for your thoughts on this matter
Dwayne
Attachments:

RSS

New from Zenith:

Zenith Planes For Sale 
 

Classified listing for buying or selling your Zenith building or flying related stuff...

                                                     

Weather Maps


Custom Instrument Panels
for your Zenith
:

Custom instrument panels are now available directly from Zenith Aircraft Company exclusively for Zenith builders and owners. Pre-cut panel, power distribution panel, Approach Fast Stack harnesses, Dynon and Garmin avionics, and more.


Custom Upholstery Kits for your Zenith Aircraft:

Zenith Vinyl Upholstery Kits


Zenith Apparel from EAA:


Zenair Floats


Flying On Your Own Wings:
A Complete Guide to Understanding Light Airplane Design, by Chris Heintz


Builder & Pilot Supplies:

How to videos from HomebuiltHELP.com

Developed specifically for Zenith builders (by a builder) these videos on DVD are a great help in building your own kit plane by providing practical hands-on construction information. Visit HomebuiltHelp.com for the latest DVD titles.

Aircraft Insurance:

 
 

West Coast USA:

Transition Training:

Pro Builder Assistance
 

Pro Builder Assistance

Aircraft Spruce & Specialty for all your building and pilot supplies!

© 2019   Created by Zenith.Aero.   Powered by

Badges  |  Report an Issue  |  Terms of Service