When checking the location of several cones in a plate, the engineer asked to reference from a certain cone. After setting the X-Y origin as asked, the output for this datum cone is not 0,0. Anybody have an explanation for this? Thanks, Pete
Using a cone for an origin
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Yep, the order in which you DO the alignment will also have an effect on the results. For example, if you origin XY to the cone THEN level to a plane, it WILL change the location of the cone, if it is NOT 100% perp to the plane.sigpic
Originally posted by AndersII've got one from September 2006 (bug ticket) which has finally been fixed in 2013.
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Sorry, I'll give you more details. All features are measured in DCC. Each cone is theoretically perpendicular to the leveling plane. The alignment is leveled to the plane and rotated using the long side of the part. Each cone is then measured. Prior to outputting the desired measurements, the alignment is reset using the same plane and line with the datum cone as the x-y origin and the leveling plane as the z origin. The x-y output for the datum cone after this re-alignment is 0.001, 0.0001; not 0,0.
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Originally posted by pgardner View PostSorry, I'll give you more details. All features are measured in DCC. Each cone is theoretically perpendicular to the leveling plane. The alignment is leveled to the plane and rotated using the long side of the part. Each cone is then measured. Prior to outputting the desired measurements, the alignment is reset using the same plane and line with the datum cone as the x-y origin and the leveling plane as the z origin. The x-y output for the datum cone after this re-alignment is 0.001, 0.0001; not 0,0.
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Originally posted by pgardner View PostGoodluck, That sort of makes sense to me, but if the x-y output of the cone is at the cone vertex, wouldn't the software use that point for the origin and reset it to 0,0?
I think the problem lies in the alignment. When you do the alignment do you level first and then transfer the axis as Matt sort of suggested?
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Are we positive that the vertex of the cone is where the X/Y/Z point of the cone is located? When you specify the nominals it is not to the vertex...
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cmmguy, I was trying to find that info in the manual, but didn't see anything. As a check, I just set the cone to x-y-z = 0, and when I did that, the graphic display window indicates that the vertex is the x-y-z position. At least the red alignment icon seemed to be where the vertex would be. It definately was not within the measured area of the cone.
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It sounds like when you are reporting the location of the cone, the vertex point is being projected to the Z origin plane and the slight skew of the cone is showing up there. Try constructing a point where the cone and plane intersect and use that point for each cone to do these measurements that you are trying and see if that makes a difference.
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