hexagon logo

Guidance Appreciated on True Position

I have two large bores with 6 intersecting slots at different levels in each bore, and each slot is at a different angle. Both bores have threads and undercuts so I can only create a cylinder on a small area. I created the slots as 3D features to get accurate readings at the individual angles.

I need to check the true position for the slot, bore, and datum A. Datum A is a plane parallel to the cylinder, and perpendicular to the slots.

I was told I must create a new origin point and alignment for each true position feature by a veteran inspector at our company. He is very wise when it comes to inspection, but has basic computer skills. I was hoping I could get some guidance on what the best way would be to complete this inspection. All advice is appreciated.
  • I have two large bores with 6 intersecting slots at different levels in each bore, and each slot is at a different angle. Both bores have threads and undercuts so I can only create a cylinder on a small area. I created the slots as 3D features to get accurate readings at the individual angles.

    I need to check the true position for the slot, bore, and datum A. Datum A is a plane parallel to the cylinder, and perpendicular to the slots.

    I was told I must create a new origin point and alignment for each true position feature by a veteran inspector at our company. He is very wise when it comes to inspection, but has basic computer skills. I was hoping I could get some guidance on what the best way would be to complete this inspection. All advice is appreciated.


    "I must create a new origin point and alignment for each true position feature"

    It will help if you show us what the specification is. Do all of the features have different origins?
  • This image shows two of the slots at 33° angles. I have the part leveled to ZPLUS on the face of the bores XPLUS is from left to right. I tried creating a new alignment in the middle of the bore on Z level to the nominal of the slot location and created a true position dimension from the slot to J and A at that alignment.

    The results indicated the true position was indeed good, but the numbers displayed for the X and Y did not seem related to the drawing. I know that part I have is good because it is a “Golden Part” provided by our customer.

    Attached Files
  • Non-radial tolerance zone as well, which indicates that the angle should be the deciding factor for the result...
  • You might get more replies in the CMM sub forum.
  • Thank you for your help, I didn't realize which forum I posted this in!