Dimensioning Sheet Metal Flat Pattern

My boss dimensions from outside the flange walls and thinks.

Dimensioning sheet metal flat pattern.

When producing drawings of sheet metal components i dimension from inside the flange walls. Keep default values in calculator as zero. If the value of sheet metal k factor and bending flange length is known. Dimensions given on a flat pattern are affected by several bending factors like k factor and bend radius during the 3d modeling stage.

Bend allowance ba π 180 r k t a. 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. Use k factor calculator to calculate k factor values. 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.

Flat patterns of all bodies appear at the end of the featuremanager design tree. Enter flange length internal radius and thickness values. Sheet metal flat length can be calculated in the following three simple steps. And also find you fold centers more easily.

This can be a physical drawing or template or a computer model. The flat pattern drawing doesn t always list these factors. Value of bend deduction and flat pattern are shown in result section. Oml outside mold line the intersection of two outside surfaces of a part extended past the bend.

Calculate the value bend allowance for required sheet metal bend by using below formula. Lets go ahead and include all the fastener locations. 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 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. Multibody sheet metal parts. Enter k factor values.