Dimensioning Sheet Metal Flat Pattern

When producing drawings of sheet metal components i dimension from inside the flange walls.

Dimensioning sheet metal flat pattern.

Bend allowance ba π 180 r k t a. Flat patterns of all bodies appear at the end of the featuremanager design tree. Use k factor calculator to calculate k factor values. Generally capabilities of of 0 9mm 20mm in thickness are able to be manufactured from sheet 3mm or plate 3mm but this tolerance depends mainly on the part.

Enter flange length internal radius and thickness values. Enter k factor values. Calculate the value bend allowance for required sheet metal bend by using below formula. Value of bend deduction and flat pattern are shown in result section.

The flat pattern drawing doesn t always list these factors. I think this is the better way because you can acquire your cutting length without a flat pattern by adding the inside lengths fold allowance. Lets go ahead and include all the fastener locations. Dimensions given on a flat pattern are affected by several bending factors like k factor and bend radius during the 3d modeling stage.

Keep default values in calculator as zero. Flat pattern terminology iml oml c l radius flat pattern the outline definition of the part in it s flat state before forming. Here are the steps to be followed to calculate sheet metal flat length. The sketch and locating dimensions are retained.

This can be a physical drawing or template or a computer model. Sheet metal flat length can be calculated in the following three simple steps. When you expand the representation of a body in the cut list the body s flat pattern appears at the end of its feature list. If the value of sheet metal k factor and bending flange length is known.

Oml outside mold line the intersection of two outside surfaces of a part extended past the bend. Multibody sheet metal parts. The flat pattern drawing doesn t always list these factors.