Heel Line In Sheet Metal

Most sheet metal materials will conform to the calculations.

Heel line in sheet metal. Air bending one of the three types of bending for sheet metal where the outside mold line is not pressed against the die. This chapter introduces you to basic sheet metal and fiberglass ductwork fabrication. Any time you hit sheet metal with steel hammer against a steel dolly it stretches. Laying out the throat and heel.

Fabricating precision sheet metal aircraft parts. The following illustration shows the equation calculation for determining the bend line to mold allowance when forming sheet metal. Body ii in this instance is formed from a sheet metal blank which is bent to provide a bottom l2 and upstanding front and rear walls l3 4 respectively. Some of the methods of measuring marking.

Bend line shift bls the distance from the outside mold line to the original bend line on the flat pattern. Point to draw the line tilting the tool slightly in the direction of movement figure 13 1. You may be thinking that a preceptor pup is a rag and tube airplane and the sheet metal work makes up a very small portion of the airplane but when you take that innocent piece of sheet metal and try to put a bend in it things can get complicated in a hurry. The file is formed of relatively light gauge sheet metal and comprises a main body or box it and a hinged cover ll.

Shrinking metal is a special technique and there are many ways to do it. You will be introduced to the tools needed to work the sheet metal. Whatever you want to call it. This is a specialty of mine so this section will be fairly extensive.

Fhe ends of the box are closed off by separate end panels 5 which are spot welded or otherwise secured to walls 3 and i4. Commonly used equipment include box and pan brakes brake presses and other specialized machine presses typical products that are made like this are boxes such as electrical enclosures and rectangular ductwork. For short lines use the steel scale as a guide. This is used to calculate the back stop location when working off of a flat pattern.

Bending is a manufacturing process that produces a v shape u shape or channel shape along a straight axis in ductile materials most commonly sheet metal. Using wood you eliminate one of those hard points so the metal can move without stretching. To think about bending a sheet of metal that has appreciable thickness focus on an imaginary central sheet the so called neutral line or neutral axis within the thickness. A common mistake the length of the throat and heel is radius x 1 57.

Laying out the heel and throat is pretty basic however you must take the length of your flat cheek pattern and not the length of the offset pattern. This page also includes a link to a on line calculator.