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Milling and Grinding Tolerance

In flamecutting and sawcutting of steel plate, we define tolerances for the dimensions of the cut shape or profile. Squareness of the cut is also important. Finishing the surface of the part by milling or grinding brings into play an additional set of definitions, qualities, and tolerances that vary depending on the application. These are most commonly spelled out in one of the following ways:

  • One side
    Clean up only
  • Two side (top & bottom)
    Clean up only
    To finish size
    To finish size, and parallel
    To size, flat, and parallel
  • Four side or Six side
    To finish size, parallel, and perpendicular

It is important to remember that none of these qualities (clean up, finish size, flatness, parallel, perpendicular) is ever assured or implied by another. For example, it is quite possible to produce a part to a finish size and parallel, but not flat. Or to produce one that is to a size, flat, and parallel, but not 100% cleaned-up. Also, each quality requires different steps and has different costs associated with it. The more specified, the higher the grinding costs.

Size tolerances are generally expressed as plus-or-minus (denoted as + / -). Flatness and parallelism tolerances are defined in terms of overall allowance. Thus, a part ground to a dimensional tolerance of +/- 0.003 might have a flat and parallel tolerance of 0.005

 

 

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