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Thread: tolerances, machining and cost

  1. #1
    Associate Engineer
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    Question tolerances, machining and cost

    Guys,
    I make a bar to have clearance fit into a slot. The bar is X+0/-.0010" (eg: 1.0000 +0/-.0010" , which give a tolerance of .0010"). Now, the slot size is either (a) X+.0010/+.0002" (tol= .0008") or (b) X+.0010/+.0005" (tol=.0005").
    Q: which tolerance fit best, easier machining process and cost effective?TQ

  2. #2
    Administrator Kelly Bramble's Avatar
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    The variation of + or - is meaningless, we can rewrite a tolerance variation anyway we choose relative to the nominal size.

    What matters is the total tolerance variation relative to the material, size, target manufacturing process, and associated target costing. Your tolerances specified are achievable and fit is determined by the clearance of the completed parts.

    See: https://www.engineersedge.com/general_tolerances.htm
    Tell me and I forget. Teach me and I remember. Involve me and I learn.

  3. #3
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    Here you can find an exceptional tolerance value.
    https://www.engineersedge.com/iso_tolerance.htm

  4. #4
    Administrator Kelly Bramble's Avatar
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    Quote Originally Posted by ridvansteel View Post
    Here you can find an exceptional tolerance value.
    https://www.engineersedge.com/iso_tolerance.htm
    And even better https://www.engineersedge.com/calcul...tolerances.htm
    Tell me and I forget. Teach me and I remember. Involve me and I learn.

  5. #5
    Associate Engineer
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    Cool

    thanks guys,

    I need to explain to some guys here at my place that X+.0010/+.0005inch is tighter than X+.0010/+.0002inch as the former tolerance is .0005" and the later is .0008" This means that the later dimension is preferable by machinist.
    Am I suggest the correct statement?
    Last edited by Ayien; 01-18-2018 at 10:03 PM.

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