Heel Line In Sheet Metal

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.

Heel line in sheet metal. Any time you hit sheet metal with steel hammer against a steel dolly it stretches. Some of the methods of measuring marking. Fabricating precision sheet metal aircraft parts. 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.

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. A common mistake the length of the throat and heel is radius x 1 57. Laying out the throat and heel. 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.

The best is to use heat a wood hammer and a dolly. Shrinking metal is a special technique and there are many ways to do it. 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. Mark your width of the fittings on both ends and draw a straight line.

Air bending one of the three types of bending for sheet metal where the outside mold line is not pressed against the die. So in a part generated with the sheet metal tools your bend lines are stored in the flat pattern feature remember that this sketch you can show hide and suppress unsuppress to control how when it is displayed. The file is formed of relatively light gauge sheet metal and comprises a main body or box it and a hinged cover ll. Bend line shift bls the distance from the outside mold line to the original bend line on the flat pattern.

This chapter introduces you to basic sheet metal and fiberglass ductwork fabrication. The following illustration shows the equation calculation for determining the bend line to mold allowance when forming sheet metal. You will be introduced to the tools needed to work the sheet metal. This page also includes a link to a on line calculator.

This is a specialty of mine so this section will be fairly extensive. Using wood you eliminate one of those hard points so the metal can move without stretching. Most sheet metal materials will conform to the calculations. This is used to calculate the back stop location when working off of a flat pattern.

For short lines use the steel scale as a guide. Whatever you want to call it.