Craftsman's Cribsheet No. 78: Straightness of Cold Finished Steel Bars
The straightness of cold finished steel bars, and all other barstock for our machines, is of critical importance.
The straightness of cold finished steel bars, and all other barstock for our machines, is of critical importance. The controlling standard is ASTM A 108, Table A1.4. However, the standard errs in claiming the tolerances are measured by placing the bars on a level table and the depth of the arc then measured with a feeler gage and straight edge. While that will give a value for the maximum departure from straightness, it does not actually describe the true geometric relationship.
All Craftsman’s Cribsheets are available for viewing and download at short.productionmachining.com/cribsheets.
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