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The Play button is grayed out when values less than 1.000 are entered in "End" box of the the Drive Contraint dialog (see screen shots in attachments).
I can't see any reason for this. Same behavior in 2013.
I just want to drive the movement less than an inch at a slow rate which you can do with the play button.
Is this a bug?
Gary
IV2014 SP1
It's to do with the 'Increment' setting...
With your current settings it will be outside the driven range on it's first step.
"Travel 0.218 inches with a step increment of 1.00 inches"
try changing the increment setting to be "Number of steps" and increase that value until you get the fidelity? that you require