I am trying to change the radii of the fillets. Minute 8:13. of Tutorial 05a
https://www.youtube.com/watch?v=e6murcd ... 8q&index=4
When I click on the arc itself, it shows 12.70 mm in property view. But as you can see from the screenshot, the arc value is 3.175.
If I select that art and click radius in the constraints tools, it shows a radius of 3.17. If I try to change that to 6.35, this is rejected. The message is "Negative datum values are not valid with the constraint with index 62"
Any help unraveling this would be appreciated (Is this the result of not following bejants advice earlier? I can't see any connection.)
I have just attempted to redo the sketch by following bejants advice:
"With Constraint 43 existing, apply a Horizontal Constraint to the upper horizontal line segment of the inside of the pulley cheek.
Sketcher Solver gives a message that there are now redundant constraints, and instructs us to delete that last constraint we applied, which is Constraint 62.
Instead, scroll down the Combo View window, past the Solver Messages and Edit Controls areas (widgets), to the Constraints widget. From the Constraints widget, select Constraint 43 and press the Delete key on your keyboard to delete it.
Sketcher Solver reports no redundant constraints in the Solver Messages area and also reports that there is 1 DOF remaining.
Now you can set the distance between the inside of the pulley cheeks by selecting one endpoint from each of the horizontal line segments, or instead by selecting the vertical line segment that connects the two horizontal ones, and applying the Vertical Distance Constraint.
Now the Sketch is Fully Constrained."
I removed constraint 43 then attempted both to
a) select the 2 point of the vertical line between the cheeks
AND b) just the line itself, then set a vertical distance constraint of 41.275. Freecad wont let me do it. I think there might already have been a constraint there, that I may have to remove.