[TheForge] Precision Forging

Thu Jun 6 04:29:02 2002

Father always said to subtract the thickness of the metal for each 90* of
bend.

This usually works pretty well . . . . . . more or less. <grin> Soooooo I
fudge by starting at one end, setting the length of the straight by how I
clamp it in the vise and proceed to the end, then trim any excess.

Frosty
------------------------
If it ain't forged
it ain't real.
Wrought iron is.
The FrostWorks

----- Original Message -----
From: "Bob Rackers" <[email protected]>
To: "TheForge" <[email protected]>
Sent: Monday, June 03, 2002 12:17 PM
Subject: [TheForge] Precision Forging

> I'm curious to hear how everyone calculates the amount of material (i.e.
> length) required when the piece will have at least one bend.
>
> I figure there are four types of bends, and each requires a different
> calculation.
>
> Assuming a 90 degree bend, you could have
>  A. Radius inside the bend / Radius outside the bend
>  B. Radius inside the bend / Square corner outside the bend
>  C. Square corner outside the bend / Radius inside the bend
>  D. Square corner inside / Square corner outside
>  E. Long radius (many times the thickness of the material, e.g. a 10"
radius
> made from 1/2" rod)
>
> Assume making something with the following shape and dimensions from 1/2"
> square.
> If the lengths of the horizontal portions (left to right) are respectively
3",
> 6", and 3", and the two verticals are both 2", (in other words, the
portion
> UNDER the middle horizontal line is 2")....
>  1. What is the total length of the item (horizontal distance S to E)?
>  2. For each of the above types of bends A - D (ignore E), how much
material
> length is required?
>            ____________
> S______|                 |______E
>
> The straight portions are easy enough to add, but I'm curious how everyone
> calculates the required bending allowances for the different types of
bends.
>
> Please show your work. :-)
>
> Bob
>
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