Madhu454
Mechanical
- May 13, 2011
- 129
Hi All,
This is a very basic question, but just wanted to know all of your opinion on this.
Please see the attached drawing, the hole is located with only two datums. Like other cases it does not consider the bottom surface which is perpendicular to the hole axis.
I know this won't control the perpendicularity of the hole axis wrt to bottom surafce. Also this wont create a DRF.
1) Does this is legal representation in ASME Std??
2) Does it is always required to have 3 mutually perpendicular planes to establish a origion for measurement (Like DRF). if my functionality does not demands for perpendicularity of the hole can I use only 2 datums.?
3) In ISO std it is allowed to mention only 2 datums as shown in the drawing. but not sure wheter it is allowed in ASME, I have not seen new std ASME- 2009.
Could yu please clear this doubt?
This is a very basic question, but just wanted to know all of your opinion on this.
Please see the attached drawing, the hole is located with only two datums. Like other cases it does not consider the bottom surface which is perpendicular to the hole axis.
I know this won't control the perpendicularity of the hole axis wrt to bottom surafce. Also this wont create a DRF.
1) Does this is legal representation in ASME Std??
2) Does it is always required to have 3 mutually perpendicular planes to establish a origion for measurement (Like DRF). if my functionality does not demands for perpendicularity of the hole can I use only 2 datums.?
3) In ISO std it is allowed to mention only 2 datums as shown in the drawing. but not sure wheter it is allowed in ASME, I have not seen new std ASME- 2009.
Could yu please clear this doubt?