I have a 4 hole bolt pattern which is the customer mounting feature. They want a (4X) true position on these holes to an ABC alignment, so that was easy enough. They also want a (4X) True Position to A, which is the plane in which they lie in. I just contstucted a feature set and did a true position as a pattern. Is this correct? There is a dimension option for position between, but I don't completely understand how that works. Any help or clarification on this is greatly appreciated.
Relative Position Question
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We build oil pumps for almost all automotive manufacturers. The guys at GM do in fact view this as perpendicularity. Our engineers here that drew the print, say the callout is the position of the holes relative to each other. They have a True Position of .4 to A,B,C and a True Position of .2 to A.The reason everyone doesn't succeed is because a method has not yet been devised where a person can sit down and slide uphill
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I think once it becomes a group of holes that it becomes a relative, if it is for a single hole, it is perp. By only including the A for the group, that means that the group itself can float side-to-side as well as rotationally AS LONG AS the individual TP is in spec, the pattern can move a little bit, how much depends on the individual TP and the group relationship.
I would use those 4 holes in a 2-D best-fit, trans & rotate alignment, then TP them to that.sigpic
Originally posted by AndersII've got one from September 2006 (bug ticket) which has finally been fixed in 2013.
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Originally posted by Stephen Andrews View PostThat sounds good Matt. By creating a feature set, and then doing true position as a set, am I only getting the origin of the pattern relative to current alignment?sigpic
Originally posted by AndersII've got one from September 2006 (bug ticket) which has finally been fixed in 2013.
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Your right Matt. I am currently doing feature set, I just wanted to be able to explain the numbers for position I am getting now. I plan to change to the best fit alignment using the 4 holes, and doing true position from that alignment. I need to be able to explain the diffrent in before/after numbers to make sure everyone is on the same page.The reason everyone doesn't succeed is because a method has not yet been devised where a person can sit down and slide uphill
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Sorry for the late response...got tied up out on the floor. I appreciate all your help and insight. I am going to try this tomorrow if I get the chance and do some more studying on this. Thanks again.The reason everyone doesn't succeed is because a method has not yet been devised where a person can sit down and slide uphill
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Reference ASME Y-14.5 2009
section 7.5.1 Composite Positional Tolerancing.
Perp to -A- while maintaining postional location referenced in upper frame.
B&S CHAMELEON/PCDMIS CAD++ V2011
There are no bugs, only "UNDOCUMENTED ENHANCEMENTS!"
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Originally posted by dph51 View PostReference ASME Y-14.5 2009
section 7.5.1 Composite Positional Tolerancing.
Perp to -A- while maintaining postional location referenced in upper frame.
In fact, both are required in both frames.
The upper frame requires locational adherence to the datums referenced in a cylindrical zone.
The bottom frame requires locational adherence (in this case) of the holes to each other in a smaller cylindrical zone.Lately, it occurs to me
What a long, strange trip it's been.
2017 R1 (Offline programming)
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Originally posted by John Riggins View PostThe above makes it sound like one frame requires positional location and the other requires orientation (perpendicularity).
In fact, both are required in both frames.
The upper frame requires locational adherence to the datums referenced in a cylindrical zone.
The bottom frame requires locational adherence (in this case) of the holes to each other in a smaller cylindrical zone.
a better explanation. Thank you John.
B&S CHAMELEON/PCDMIS CAD++ V2011
There are no bugs, only "UNDOCUMENTED ENHANCEMENTS!"
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