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ptc-21510621-Visitor
1-Visitor
April 14, 2011
Question

ISO Standard Fits and Tolerances

  • April 14, 2011
  • 1 reply
  • 17371 views

Hello all,

We have recently decided to use ISO Standard Fits for hole/shaft dimensions, such as a hole dimension 40H8. This has created confusion with some of our vendors. Also, for example, when +/+ (or -/-) tolerances are used for a hole on a drawing, the hole in the solid model is now outside the actual tolerance range. This could be problematic if a vendor typically makes parts based on the solid model, and uses the drawing to verify the part.

My solution is to show both the ISO tolerance callout (ie H8), as well adding the actual tolerance in parentheses, such as 40H8 (40.039/40.000).

Any ideas on how to do this in WF 5? The problem is getting the parentheses into the callout.

Thanks,

Andri


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1 reply

S
s.iyer1-Visitor
1-Visitor
April 15, 2011

To get a similar effect, set the following...

Config.pro options:

tol_display --> yes

tol_mode --> Nominal

Tolerance_Class --> medium

Tolerance_Standard --> ISO

-----------

File --> Properties --> Change Tolerance --> Retrive Tolerance --> Hole "H", Shaft "j" and "g" [Alternatively you may retrive commonly used tolerance Grades in you START.prt]

------------

Config.dtl option:

tol_display: YES

Tolerance mode: LIMITS to get the upper and lower limits as shown for 60 H7 and Tolerance model Plus/minus to get the result as shown for 80 j7.

******************

As for the vendor using the solid model for reference, you may choose to use DIMBOUND. Dimbound binds the size to either the upper limit or the lower limit or at the Central portion. e.g. For 60 H7, if you bind the geometry to the Central, it would bind the geometry to 60.015 and not 60; meaning your measured diameter would be 60.015 which is the average of 60.000 and 60.030.

Capture.PNG

    P
    ptc-21510621-VisitorAuthor
    1-Visitor
    April 15, 2011

    SCIYER26,

    the outline you described is exactly what I was looking for. I was not aware of ISO Tolerance tables built into ProE. However, I'm still not getting the results shown in your drawing. I have set all the config.pro and config.dtl options, and I can retrieve the H tolerance (For WF5, it's File-->Tolerance Standard-->Tol Tables-->Retrive--> Hole "H". At this point, I regenerate, but nothing happens to my dimensions. Is there an additional step I am missing here? How do I apply the H7 tolerance to a specific dimension?

    Also, you talked about DIMBOUND. Is that a config.pro option? How do I use it?

    Thanks for your help so far,

    Andri

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