Establishing -F- datum - need advice

T

Tami_

#1
#1
Having some disagreements on how to establish this -F- datum on a machining print. The circle through the hole is determined by the location of two other boltholes on this casting. Question is: Two lines on the outside of boss (cast surface) establish a center point between them and place it on the circle through the bolthole (even if it doesn't line up with the actual bolthole??).

Any help would be appreciated. This datum is used in true positioning so it needs to be correct!
 

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#2
#2
You cannot reduce the geometry of two parallel lines down to a point. What do you know about the application? How does the part align in the next operation / assembly? I assume datum F is a clocking feature. You need to know the degree of engagement into the next operation / assembly to determine where in the drafted surface to establish the datum (all of which must be done RFS). Seeing more of the datum structure and positional callouts would be helpful in answering your question.
 
T

Tami_

#3
#3
Thx for the input. I agree with you which is the dilemma I am in. Think we found a solution. IMO this print and the associated callouts were poorly done.
 
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