But, passing in front and then behind the hub improves the cranking illusion.Ī solution to the problem is to replace the knob at the top of the stroke with a second identical knob that can be set Back of the hub for the downstroke. One way to fix the problem is to remove the parts of the sharpener that cause the problem. The issue is that the knob can’t be in front of the hub and, at the same time, behind it. The knob should pass in front of the “hub” that connects the crank to the sharpener on the upstrokes and behind it on the downstrokes. Here’s the animation with the rest of the sharpener:Ĭlose observers will note that there is something not quite right about this animation. Even primitive tools like copy and paste are not implemented for effects in the Animation Pane. This might make the Animation Painter more useful, too. PowerPoint animation does not providing a way to “group” a series of effects and treat the group as a single effect (so that Repeat could be applied, for example). Here’s the animation pane (the timing is faster): As a result, I had to repeatedly manually apply and align the Collapse/Stretch animations on the timeline. It’s easy enough to repeat a single effect by setting the Repeat effect option but there is no convenient way to repeat a series of effects. Next, I want to repeat this sequence a few times. The duration shown includes both parts of the path.Īlso, you may have noticed that I added a small gray rectangle to the knob this hides the effect of the difference between the motion path length and the Stretch/Collapse lengths (you can see the discrepancy in the first version of the animation above). The motion path has Auto-reverse set so that the knob will return to the bottom position. The second animation shows the knob aligned with the crank parts. The knob tracks along using a motion path. The higher part then Collapses downward followed by the Stretch downward of the lower part.
The lower part of the crank Collapses upward, immediately followed by a Stretch upward of the higher part of the crank. Here’s the animation to simulate the cranking action the animation is purposely/temporarily slow: The dotted rectangle temporarily shows the pencil location. I added some highlights/shadows to the basic drawing and then added the fill colors: If you use an electric sharpener, a sound effect would add some interest.Īs usual, I made the sharpener using an image and overlaying standard shapes.
This may be an anachronistic device for some of you but it’s a more interesting animation than the electric type. The message here is “getting started” but it could be “make your point” or “stay sharp.” Here’s a PowerPoint animation of a hand-cranked pencil sharpener:
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