dimensioning rules for drafting
There should not be multiple forms of the same measurement .
Place the dimension to show the Shape and form of the object.
Dimensions should be placed clearly between veiws especialy if it applies to both views.
Allways use the centerline symbol or note to show symatry. Do not assume it is semetrical.
The dimensions should be horizontal or vertical if possible.
Crossing demension lines should be avoided when possible.