Machining Allowances for Steel - AS1182 - Standard Straightness Tolerance for Metal and Steel Bars

Our topic for today involves some of the things that can affect your manufacturing plan for any given steel part. Machining allowances for steel bars and mechanical tubing.....Aerospace standard AS 1182
Full Transcript: www.michlinmetals.com/standar...
Most raw steel products are permitted to have limited surface imperfections from the manufacturing processes at the mill. The allowable depth of these imperfections is restricted to the depth of the machining allowance. Hot working and thermal treatments can also result in a decarburized surface. While allowable in the raw material, we don't want these imperfections in our finished parts.
The machining allowance establishes the amount of stock to be removed from the surface of the mill material to assure any surface flaws or decarb present will also be removed.
We need to emphasize " removed from the surface"..... other factors can make this more complicated than it would seem to be.

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