Dimensioning Sheet Metal Flat Pattern

The flat pattern drawing doesn t always list these factors.

Dimensioning sheet metal flat pattern.

Calculate the value bend allowance for required sheet metal bend by using below formula. This can be a physical drawing or template or a computer model. My boss dimensions from outside the flange walls and thinks. Here are the steps to be followed to calculate sheet metal flat length.

Multibody sheet metal parts. 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. 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. Sheet metal flat length can be calculated in the following three simple steps.

Flat pattern terminology iml oml c l radius flat pattern the outline definition of the part in it s flat state before forming. Value of bend deduction and flat pattern are shown in result section. Bend allowance ba π 180 r k t a. 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. When considering sheet metal thickness a single sheet with punches holes is a good rule of thumb. The flat pattern drawing doesn t always list these factors. And also find you fold centers more easily.

The sketch and locating dimensions are retained. Enter flange length internal radius and thickness values. Enter k factor values. Flat patterns of all bodies appear at the end of the featuremanager design tree.

Oml outside mold line the intersection of two outside surfaces of a part extended past the bend. If the value of sheet metal k factor and bending flange length is known. 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.