print attached.
This will probably seem awfully elementary to most of you here, but this is messing with me head.
The primary datum A is a stud cylinder.
The secondary datum B is a plane.
The tertiary datum C is a line.
I've measured all the features, now to what do I 'level', 'rotate' TO and ABOUT? and which features should I use as origins?
It seems yo me that on the drawing, that the basic dimensions are all zeroed and centered on the datum A cylinder. So it would seem to follow that I'd need to level to A and origin on A, right? but the rotate thing has me perplexed. If I level to A, and then try to use B as a rotate, then aren't those basically the same features? I mean if I make cyl A the level to Z plus, then choose B as my rotate feature, it is also a Z plus feature. Can you rotate TO Z plus ABOUT Z plus, after I've already leveled Z plus? That seems illogical. Then C is sitting down there as a Y origin feature, but none of the basic dimensions reference that line.
I am confused. help.
This will probably seem awfully elementary to most of you here, but this is messing with me head.
The primary datum A is a stud cylinder.
The secondary datum B is a plane.
The tertiary datum C is a line.
I've measured all the features, now to what do I 'level', 'rotate' TO and ABOUT? and which features should I use as origins?
It seems yo me that on the drawing, that the basic dimensions are all zeroed and centered on the datum A cylinder. So it would seem to follow that I'd need to level to A and origin on A, right? but the rotate thing has me perplexed. If I level to A, and then try to use B as a rotate, then aren't those basically the same features? I mean if I make cyl A the level to Z plus, then choose B as my rotate feature, it is also a Z plus feature. Can you rotate TO Z plus ABOUT Z plus, after I've already leveled Z plus? That seems illogical. Then C is sitting down there as a Y origin feature, but none of the basic dimensions reference that line.
I am confused. help.
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