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Recent content by engAlright

  1. engAlright

    Cons of zero tolerancing at MMC

    In some applications you may require a very close fit with a pin, but the location of the pin is not critical (or at least less critical). In that case for ease of manufacture you may apply a loose positional tolerance with tight control on the hole diameter. It doesn't make sense to impose...
  2. engAlright

    Countersunk Holes and Implied 90

    Well seems like I'm in the minority...consensus seems to be that showing the angle is the way to go. It still seems weird to show a 90° angle dimension on a drawing but I understand that the tendency will be to assume the Engineer has forgotten to add a dimension, rather than assuming an implied...
  3. engAlright

    Countersunk Holes and Implied 90

    Thanks for the responses everyone. I appreciate the recommendation to add the 90° angle for clarity, but that could be said about any 90° angle on a drawing. There are many instances where geometry lines or centrelines do not intersect but an implied 90 applies: see Fig. 7-21 of the 2018...
  4. engAlright

    Countersunk Holes and Implied 90

    Section 1.8.12 of Y14.5-2009 indicates that for countersunk holes "...the diameter and included angle of the countersink are specified.". In the corresponding figure 1-39 the countersink feature is shown dimensioned with a 90° angle. Why is an angle dimension required when the included angle...
  5. engAlright

    Cylindrical Feature with Inclined Datum

    Thanks chez311 that explains it very well. As you mention I think the caveat is if the surface is at a relatively small angle it might not do a good enough job of constraining the rotation, depending on your requirements.
  6. engAlright

    Cylindrical Feature with Inclined Datum

    Hi All, Let's say I have a round bar with Datum A defined as the center axis. Then I cut the bar at an angle, and make this angled surface datum B (inclined datum). Do Datums A and B comprise a fully constrained datum reference frame for additional features, or is a tertiary datum required? In...
  7. engAlright

    Assembly Dimension - reference dimension with tolerance or dimension with tolerance

    Using surface roughness symbols you can specify "material removal prohibited" (circle inside a vee). Wouldn't hurt to add a note to reinforce the point. I don't think you could expect a manufacturer/assembler to make the correct assumption. As others have mentioned though I would consider why...
  8. engAlright

    how to align two holes colinear with each other

    Ah ha seems I grabbed on to OP's "collinear" description incorrectly. pmarc's covered it in regards to positional tolerances...if the tight requirement between the two holes was strictly to have their axes parallel then a parallelism refinement could be applied on the composite positional tolerance.
  9. engAlright

    how to align two holes colinear with each other

    Per Y14.5-2009 you can use the "Continuous Feature" symbol to control both holes together as a single feature. In this case the coaxiality of the two holes is controlled within the limits of size.
  10. engAlright

    Masked Area Location using Geometric Controls

    Why wouldn't a positional tolerance apply? Y14.5-2018 lists "a circular element" as a type of regular feature of size (3.35.2).
  11. engAlright

    Clocked angular dimensions

    In the case of 4 holes equally spaced about a center axis can you not just draw centerlines between each of the two sets of holes? This invokes the implied basic 90° angle between all the holes (Y14.5-2009, 2.1.1.3). Add a basic diameter for the bolt circle and you are done. Sure basic angles...
  12. engAlright

    PDM enterprise....I'm starting to hyperventilate

    We have been running Enterprise for nearly 2 years and we are very happy with it. Your installation is about the size (9 swx users) where you will see some real benefits with Enterprise over PDMWorks Workgroup. The UI in enterprise is very easy to learn (integrated with expolorer)which, with...
  13. engAlright

    Software Opengl Setting

    I've seen this setting turn itself on when running SW on an "inferior" video card, however if you're getting it on an FX3500 it's likely a driver issue as sbaugh indicates. When reinstalling check to make sure you have the driver approved for use with SW (not the latest driver)...
  14. engAlright

    +/+ tolerances?

    I am also curious as to how this +/+ dim works...how can you have a nominal dim that falls outside of the tolerance range?
  15. engAlright

    To CSWP or not to CSWP...

    The new CSWP program sounds interesting...I am a sys admin and past attempts to convince management that we need some of our design engineers to become CSWP's have been fruitless. The hefty price tag (though it's cheaper at SW-World) and time required to train and take the exam outweighed the...
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