Dimensioning Sheet Metal Flat Pattern

The flat pattern drawing doesn t always list these factors.

Dimensioning sheet metal flat pattern.

Lets go ahead and include all the fastener locations. Sheet metal flat length can be calculated in the following three simple steps. If the value of sheet metal k factor and bending flange length is known. When considering sheet metal thickness a single sheet with punches holes is a good rule of thumb.

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. When producing drawings of sheet metal components i dimension from inside the flange walls. The flat pattern drawing doesn t always list these factors. Dimensions given on a flat pattern are affected by several bending factors like k factor and bend radius during the 3d modeling stage.

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. 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. Enter k factor values.

Bend allowance ba π 180 r k t a. My boss dimensions from outside the flange walls and thinks. The sketch and locating dimensions are retained. Oml outside mold line the intersection of two outside surfaces of a part extended past the bend.

Enter flange length internal radius and thickness values. Calculate the value bend allowance for required sheet metal bend by using below formula. Use k factor calculator to calculate k factor values. Flat pattern terminology iml oml c l radius flat pattern the outline definition of the part in it s flat state before forming.

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. Keep default values in calculator as zero. Multibody sheet metal parts.