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  • Users: TopPocket
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  1. TopPocket

    Defining Datum as Section of Surface

    Hi, First up I'm an ISO guy. I have a shaft and I want it's axis to define my datum A. The caveat is that I only want a section of the surface be used to define the datum - the first 110mm from on end. see this image: So I've got two locations defined already, K and L for another feature. I...
  2. TopPocket

    Dimensioning a Ruler

    Hi, So I've found one of those "sounds simple at first" problems. I have a part with a laser marked scale, imagine a glorified ruler. I need to specify the tolerance of the laser marks, specifically three things: - Absolute position of each mark from end face - Line Spacing between adjacent...
  3. TopPocket

    Is there a modifier to make an ISO Datum be defined like an ASME Datum?

    I work in ISO but am making a part I wish to inspect with a gauge. I want to describe the primary datum plane, and I want it to match the simulated datum plane of the gauge. So the granite table top so to speak. However, I believe that in ISO a datum would be defined by the derived median...
  4. TopPocket

    Line Profile of Bent Bar to be inspected with Envelope Gauge

    Hi, I'm an ISO guy. So I have a part which is basically an Ø8 mm bar bent into an "S" shape. All the bends are in the same plane so it should lie flat on its side. To inspect it I'm going to create and envelope gauge to put it in. So to link the part with the gauge I'm going to define the axis...
  5. TopPocket

    Correctly using Position with Shadowgraph Inspection

    Hi so I have some parts I wish to define. ISO please. The requirement is that the surface of them must fit within a volume defined by a datum axis. I figured as MMR must be used I will have to use Position rather than Runout or Concentricity. Now to inspect these I will use a Shadowgraph...
  6. TopPocket

    Perpendicularity is Perplexing

    Perpendicularity (or Axial Runout) is one of those that seems intuitive at first but actually isn't quite what you think on closer inspection. For this I'll be considering perpendicularity of a face and have my ISO hat on. As an attribute inspection it's fine, the face is either completely...
  7. TopPocket

    Aligning a dimension to a datum axis?

    Here's another one that looks simple but is actually not. I thought the best way to describe what I want to do was to sketch a wonky drawing of my requirement: So Datum A is defined as the axis of the small diameter. Datum B is then to be perpendicular to Datum A (if required). Then I wish...
  8. TopPocket

    Straightness per Unit Length, within Bound Section of Shaft

    Hi, I have a shaft (Ø10 mm, 210 mm long) I want to be straight. It passes through a 92 mm long bore. The worst case stack up shows the different in diameters to be 0.013 mm. For simplicity I assumed constant curvature of any bending so I could apply this as a simple straightness (to axis) to...
  9. TopPocket

    Sketch Dimension Style Change

    Hi, So I've been putting up with this for a while but it's annoying me now and noone seems to know how to change it. So when I'm in a sketch I'd like my dimensions to look like this: But for some reason they always default to this (which imo just looks messy and gets confusing): Where do I...
  10. TopPocket

    2 Datum Features 1 Datum - Dimensioning an irregular feature of size

    Hia, So I wish to define an irregular feature of size - the 0.6/0.7 dimension in the pocket: So I want to measure a line between the two aligned faces and then measure the distance to a point on the top face. I feel doing a x2 0.7/0.6 would suggest I want 2 measurements from each of the...
  11. TopPocket

    How is secondary Datum "Anchored" to Primary Datum?

    Hi, this is an offshoot question from my previous thread but it's quite general so more likely to have an answer. When defining datums like in the drawing below I understand Datum B to be created as a virtual axis, perfectly perpendicular to Datum A (unlike the datum feature). However I am...
  12. TopPocket

    How to define limits on hole position and diameter as worst case orientation of mating part

    Hi, I've been trying to figure out how to correctly define a hole in relation to a face but all the literature seems to be for fixed gauge pins. This isn't what I want though, I'll try explain... The hole is perpendicular to the face (which is our datum feature). The hole is there to guide a...

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