DaSalo
Mechanical
- Apr 27, 2010
- 213
Hello,
My question is about best practices for calling out the location of tooling balls and other types of precision reference features on tooling prints. I am responsible for a lot of the tooling inspection that we do and we have a fairly standardized approach to inspecting tooling. In my opinion, our inspection method is not really being captured in the way our prints are currently being dimensioned. Currently very little GD&T is being used on our prints. Attached is a drawing of a very typical baseplate assembly that locates the fixture to a round and diamond pin that are part of a standardized table on a lot of our machines. My intent is this:
1)In addition to the bottom surface, datum A, The two bushings, datums B and C, are the functional locating features. The tooling balls are used for construction purposes and for establishing program zero. The front edge of the base plate (datum D) is also used for program orientation.
2)I want the CMM inspector to orient to datum A, pick up the center of the datum B bushing, and then check the position of the datum C bushing from datum B. Next the inspector should orient one of the machine axes along a line connecting the datum B and C bushings and verify the angularity of the front edge of the baseplate (datum D). Finally, the inspector should orient one of the machine axes along the front edge of the baseplate, set X,Y zero to the center of the datum B bushing, and verify the positions of the tooling balls. The remainder of the functional dimensions of the fixture will be dimensioned from the toolingballs.
So my queston is: Does the way that I have drawn this make sense to any one else given my intent? Is there a better way or a more common way to address this type of situation?
Thanks in advance for any help and advice.
-DaSalo
My question is about best practices for calling out the location of tooling balls and other types of precision reference features on tooling prints. I am responsible for a lot of the tooling inspection that we do and we have a fairly standardized approach to inspecting tooling. In my opinion, our inspection method is not really being captured in the way our prints are currently being dimensioned. Currently very little GD&T is being used on our prints. Attached is a drawing of a very typical baseplate assembly that locates the fixture to a round and diamond pin that are part of a standardized table on a lot of our machines. My intent is this:
1)In addition to the bottom surface, datum A, The two bushings, datums B and C, are the functional locating features. The tooling balls are used for construction purposes and for establishing program zero. The front edge of the base plate (datum D) is also used for program orientation.
2)I want the CMM inspector to orient to datum A, pick up the center of the datum B bushing, and then check the position of the datum C bushing from datum B. Next the inspector should orient one of the machine axes along a line connecting the datum B and C bushings and verify the angularity of the front edge of the baseplate (datum D). Finally, the inspector should orient one of the machine axes along the front edge of the baseplate, set X,Y zero to the center of the datum B bushing, and verify the positions of the tooling balls. The remainder of the functional dimensions of the fixture will be dimensioned from the toolingballs.
So my queston is: Does the way that I have drawn this make sense to any one else given my intent? Is there a better way or a more common way to address this type of situation?
Thanks in advance for any help and advice.
-DaSalo
