Tolerances | Machining
Allowances for Machining
When regular quality alloy or special quality carbon hot rolled steel bars are to be machined, experience has shown that it is advisable for the purchaser to make adequate allowances for surface finishing and specify hot rolled orthermally treated sizes accordingly.
Such allowances require consideration of the manufacturing practice utilized to remove the surface metal, as well as the bar size, length, straightness,size tolerance, and out-of-round tolerance.
Bars should be straightened before machining. The following table contains recommended minimum machining allowance, per side, for steel bars.