ME10 does a very good job of managing fundamental geometric accuracy. Under normal conditions it works to 13 decimal places! On the other hand an ME10 user can be very poor in exploiting this! Errors can be made in selecting the points for a rotation; values can be obtained manually with a calculator or the cursor can merely catch the wrong points. It is not uncommon that errors of 0.001mm occur.

Accuracy Advisor looks at the length of lines and the radius/diameter of circles, arcs and fillets. The user can define to which level of accuracy (precision) these elements should be compared. The most important feature though is the ability to analyse a dimension's displayed value against the geometry it describes. It is this difference which gives the "error". If a dimension shows 32.76 but the geometry measures 32.7610867856 then the error is 0.0010867856mm.

Accuracy Advisor deals with three levels of accuracy: GOOD, OK and BAD. The table below illustrates how it decides which level an element should be given.

The same principle of accuracy is applied to lengths/dimensions of fractional inches. Accuracy Advisor automatically calculates the nearest real fraction and compares it to the given value.*

*) Does not apply to version 1.x

**) Note: Some geometry with "rational" lengths may be classified as "OK" when they are actually "GOOD".