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True position using z axis and angle

I am measuring this part right now this is a cylinder about 3 inches tall. The od is dat-b. The top plane is dat-a and dat-c is a slot in the center of the part. The part has 4 counter bore holes along the side of it every 90 degrees. Here is a picture of what the result looks like, and i know its wrong.
Do i need the od dat to be a cylinder or a circle?
Does it matter if its a constructed cyl or an auto cyl?
My dat c is a constructed width, should it be the line instead?

I added two pictures if that helps

please help!!

Parents
  • Why wouldn't you use Xact measure and no datum's?


    You will find that some of us simply don't trust the Demon to calculate accordingly, so instead I for instance Align my part to the FCF every time. The are maybe a few instances when I use a Datums in my TP, although I still don't trust the result very much, is when there is a modifier to a Secondary or tertiary datum.
Reply
  • Why wouldn't you use Xact measure and no datum's?


    You will find that some of us simply don't trust the Demon to calculate accordingly, so instead I for instance Align my part to the FCF every time. The are maybe a few instances when I use a Datums in my TP, although I still don't trust the result very much, is when there is a modifier to a Secondary or tertiary datum.
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