WHAT IS ACCUMULATIVE AND NON ACCUMULATIVE?
The precision drawing have non accumulative,
Are you talking about tolerances on a drawing?
Many times there are tolerance accumulations in a drawing as the result of chains of dimensions as in a hole pattern – e.g each hole being 25mm +/-0.1mm apart.
If you there were 21 holes and each hole were 25.05 mm apart by the end of the change that last hole would be 2.00 farther from the staring point than it should be. The tolerances have accumulated. It is possible that the parts will not fit together.
In a non-accumulative situation that last hole should be 500 mm +/-0.10 mm from the first one.
Niel Leon
Engineering.com
