<< Click to Display Table of Contents >> Navigation: MechDesigner Reference & User Interface > FAQs and 'How do I...?' > Part Editor: FAQs and How to...? > How do I edit the Length of a Part? 
To edit the length of a Part is one of the most fundamental actions you must do to model kinematicchains.
You must use the PartEditor to edit a Part.
Key Learnings
•Edit a Part in the PartEditor.
•You cannot edit a dimension if Add Dimension is active.
•You MUST cancel (deselect) Add Dimension before you can edit a Dimension.
•Doubleclick the arrowhead or extension line of a dimension to open the Dimension dialog.
•Nothing will happen if you doubleclick the dimension value (the number itself).
Start the PartEditor. See here: How to start the PartEditor For example: STEP 1: DoubleClick the PartOutline of the Part you want to edit 

You are now using the PartEditor. To edit a dimension: STEP 2: DoubleClick the arrowhead of the dimension 

STEP 3: Enter a new dimension in the Dimension dialogbox •You can type in a new dimension in the box You must use the ENTER key to confirm the new dimension before you use the 'OK' button.  or  •Use the spinbox tool 

OR
STEP 3: Rightclick the Dimension Value and select 'Round' The Dimension changes to the nearest value that is exactly divisible by the 'SpinIncrement'. In this example, the SpinIncrement = 10. Thus the new dimension will round to become 130. 

OR STEP 3: Enter an equation into the data box. Use the Enter key to apply the equation. •Simple Arithmetic: +, –, *, ∕ •Powers: ^, Sqrt() •Trigonometric: Angle in Radians oSin(), Cos(), Tan(), oSihn, Cosh, Tansh oArcSin(), ArcCos(), ArcTan2( ; ) 