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Alignment of Gear part

atul01011992
Daer all,

I am new guy for this user forum, currently I am using PC-DMIS in Camio 8.3. (Nikon Make)
Recently, I found a problem with a alignment issue for my product. It is about a alignment of [A-B I C I D-E ] of part. Please refer to attached file for details. In that A & B are the circles through which we are going to construct a 3S line as a primary datum, then moving ahead C is plane as a secondary datum and lastly D & E are tooth width, from which we need to construct a line through theirs mid points. As in that I don't understand how to do alignment of this part ?
Because there are 2 lines and 1 plane. and mostly unluckily axis of 3D line and Plane is same. Its conflicts my alignment. CAMIO is not allowing to add 2 line 1 plane alignment anyway.

Any help would be greatly appreciated.


Thank you in advance. Slight smile

Best Regards,​​​​​​​
Atul N
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  • Well, if the DRF states [A-B | C | D-E ] then A-B is primary datum, C secondary and D-E tertiary. Comparing this to the plane-line-point (3-2-1) method, datum C can't be used as rotation (which the secondary datum should control) as it clashes with the primary datum and D-E is a bad choice as a point, these two should swap places in the DRF?

    I feel (from the posts above) that simply disregarding the order of the datums in the DRF is okay, like "these are your datums, use them as you wish"?

    It's my first day back from vacation, so I might be a little more thickheaded than usual...
  • in reply to vpt.se
    It's not a case of "these are your datums, use them as you wish".

    It's a case of these are your datums, use them in the order given, but they only control what they CAN and they MAY.


    Example, a plane as a primary datum can control 2 rotational DOF and one translation. (for simplicity lets say rx and ry and tz.) Note, it doesn't control tx or ty because it can't!

    A cylinder used as the primary datum can control two rotational DOF and two translations (rx, ry, tx and ty). It doesn't control tz because it can't!

    I used to struggle with datum systems in general before I read about CAN-MAY-MUST.
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  • in reply to vpt.se
    It's not a case of "these are your datums, use them as you wish".

    It's a case of these are your datums, use them in the order given, but they only control what they CAN and they MAY.


    Example, a plane as a primary datum can control 2 rotational DOF and one translation. (for simplicity lets say rx and ry and tz.) Note, it doesn't control tx or ty because it can't!

    A cylinder used as the primary datum can control two rotational DOF and two translations (rx, ry, tx and ty). It doesn't control tz because it can't!

    I used to struggle with datum systems in general before I read about CAN-MAY-MUST.
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