Dimensioning Sheet Metal Flat Pattern

Enter flange length internal radius and thickness values.

Dimensioning sheet metal flat pattern.

Flat patterns of all bodies appear at the end of the featuremanager design tree. Multibody sheet metal parts. Keep default values in calculator as zero. This can be a physical drawing or template or a computer model.

Here are the steps to be followed to calculate sheet metal flat length. Bend allowance ba π 180 r k t a. When producing drawings of sheet metal components i dimension from inside the flange walls. Lets go ahead and include all the fastener locations.

Sheet metal flat length can be calculated in the following three simple steps. Oml outside mold line the intersection of two outside surfaces of a part extended past the bend. Value of bend deduction and flat pattern are shown in result section. The sketch and locating dimensions are retained.

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. Use k factor calculator to calculate k factor values. The flat pattern drawing doesn t always list these factors. And also find you fold centers more easily.

Dimensions given on a flat pattern are affected by several bending factors like k factor and bend radius during the 3d modeling stage. When considering sheet metal thickness a single sheet with punches holes is a good rule of thumb. Flat pattern terminology iml oml c l radius flat pattern the outline definition of the part in it s flat state before forming. The flat pattern drawing doesn t always list these factors.

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. 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. Calculate the value bend allowance for required sheet metal bend by using below formula.