3D model-control drawing

Group,

I've posted this to the Solidworks group, and no one seems to want to touch
it.

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Hi group,

I have a question for the plastics oriented people in the group.

For years, we've been doing business with a select few local mold houses. We
know these vendors real well, and they know what we expect from them. What
we usually do is supply them with a 3D model and a control drawing that
shows critical dimensions and tolerances. This arrangement has worked out
pretty well, in most cases.

We now find ourselves in a client driven situation where we need to specify
an overall tolerance, relative to the model, for those features that aren't
specified in the control document. The parts may be freeform shapes and
would require a 3 axis CMM to measure.

Have any of you had to deal with a similar problem ?? If so, how did you
solve it ?

Regards

Mark

 

I had to deal with this situation, but from the other side. I worked for the tool shop. We were supplied a chart with about 100 points listed each with its own tolerance. It gave the x,y,z relative to the parts coordinate system. The part file we were supplied had those Datum points in it. We were required to provide with the tool a check fixture. With the check fixture we supplied back to the customer a new chart with the points dimensioned back to a 0 on the check fixture. I forget what the name of the machine that was used to check all the points but it apparently could do it quickly and all the operator had to do was to hit a start button and it would do the rest.

John