You can do it by using the constructed line feature.
Measure the 2 circles.
Open the constructed Line feature
Select the 2 circles
Click on the Offset Radio Button this un-greys the Offsets Button.
Click in Offsets button.
Click on the first offset and enter the circle Radius
Click on second offset and enter that circle Radius
Click on the OK button this will close the offset box but leave the constructed box open
Click on Create button This will create the tangent line to the fixed values to ensure the offset values are correct for each run
you need to change the data in the EDIT WINDOW.
In the edit window find the offset line and replace the Fixed values with as example CIR1.R.MEAS,CIR2.R.MEAS
If the tangent line is not on the correct side of circle you can change that by example CIR1.R.MEAS*-1
You can do it by using the constructed line feature.
Measure the 2 circles.
Open the constructed Line feature
Select the 2 circles
Click on the Offset Radio Button this un-greys the Offsets Button.
Click in Offsets button.
Click on the first offset and enter the circle Radius
Click on second offset and enter that circle Radius
Click on the OK button this will close the offset box but leave the constructed box open
Click on Create button This will create the tangent line to the fixed values to ensure the offset values are correct for each run
you need to change the data in the EDIT WINDOW.
In the edit window find the offset line and replace the Fixed values with as example CIR1.R.MEAS,CIR2.R.MEAS
If the tangent line is not on the correct side of circle you can change that by example CIR1.R.MEAS*-1