Here is what made this part bend: You start with a flat sheet of metal cut out the notches, corner pieces etc. Just visualize what that part would look like if it was flattened out.
You will notice a couple of small holes on the flat area, web of the part. These are tooling holes. You would place the part on your wooden forming blocks on these pins. This is done so that you can make a bunch off similar parts.
Another wooden block is clamped on top of the pins. The "flanges" are sticking out. These are bent down, or hammered down. This bending, either in an expensive press or with a hammer, stretches the flange. This now longer flange is what curves the part.
Now you can shorten that flange by putting a crimp, or flute, in it. This gathers the metal and shortens the flange.
Simply put the web of the part on a flat piece of material, get down at eye level and put your fluting pliers in the middle of the holes and crimp it until the part lays flat.
Sometimes a couple of small flutes are better then one large one. Make sure none of the flutes will interfere with subsequent dimpling. Too much fluting will shorten the flange and cause the part to curve the other way!
This is one of what I call satisfying jobs in the project. You get to make something "right" with a little squeeze and a look!
Tom Martin RV1 pilot 4.6hours!
CPL & IFR rated
EVO F1 Rocket 1000 hours,
2010 SARL Rocket 100 race, average
speed of 238.6 knots/274.6mph
RV4, RV7, RV10, two HRIIs and five F1 Rockets
RV14 Tail dragger
St.Thomas, Ontario Canada, CYQS
Last edited by Tom Martin : 03-28-2017 at 07:06 AM.