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Durbal.Andrew.H10-Marble
10-Marble
September 10, 2013
Solved

Simultaneous Mechanism Motion

  • September 10, 2013
  • 2 replies
  • 4920 views

Hi All,

 

Have a blade assembly where I want to be able to rotate the 6 blades about their own axis at the same time and by the same amount with one motor.

 

Is this possible or any ideas welcome.

 

Example attached.


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Best answer by TomD.inPDX

I have connected all the blades with gears.

1st I added the rotation constraint to each blade to manage synchronicity.

2nd, I had to reverse several axis rotations; this requires you to edit definition of the assembly constraint "pin" and select the group rather than individual contraints. Now you can flip the axis rotation.

The master "blade" has the axis reversed from the others. This is so they move in the same direction. I opted to drive all 5 blades from the 1st assembled blade.

I did not apply a motor. You don't really need one. But you can make a "dial" or even a "slider" feature to manage the blade angles. See the little meter tutorial. Of course, a relation at this or another level can drive this. Just connect a relation to the rotation feature in 1st blade. Or drive the 1st blade as a motor with any motor profile.

The attached file is Creo 2.0 full version.

2 replies

T
TomD.inPDX17-Peridot
17-Peridot
September 10, 2013

You can make generic gear connections to the other blades.

T
TomD.inPDX17-PeridotAnswer
17-Peridot
September 10, 2013

I have connected all the blades with gears.

1st I added the rotation constraint to each blade to manage synchronicity.

2nd, I had to reverse several axis rotations; this requires you to edit definition of the assembly constraint "pin" and select the group rather than individual contraints. Now you can flip the axis rotation.

The master "blade" has the axis reversed from the others. This is so they move in the same direction. I opted to drive all 5 blades from the 1st assembled blade.

I did not apply a motor. You don't really need one. But you can make a "dial" or even a "slider" feature to manage the blade angles. See the little meter tutorial. Of course, a relation at this or another level can drive this. Just connect a relation to the rotation feature in 1st blade. Or drive the 1st blade as a motor with any motor profile.

The attached file is Creo 2.0 full version.

J
JoshuaHouser16-Pearl
16-Pearl
September 10, 2013

My eyes get so confused with all the motion, I can't even hardly tell which direction they're moving!

Video Link : 4335

D
Durbal.Andrew.H10-MarbleAuthor
10-Marble
September 11, 2013

Cheers Antonius, Perfect. Did not realise the user-defined properties of the gear connection being set to 1 to 1 would do this and flipping the directions of the gear connectors to make them line up.

Does take a little while to get your eyes and head round them moving in the same direction.

T
TomD.inPDX17-Peridot
17-Peridot
September 11, 2013

Nice work on the blade by the way. Is that an engineered profile?

If you "unground" the shaft and add a different ground feature (a fixed shaft for instance), you could easily automate a presentation profile by making the hub a motor and one of the blades a motor.

You might also enjoy this resource:

http://www.sharptechdesign.com/Tutorials/Mechanism_WF2/MDX_WF2_TOC.htm

I also like this motor profile for acceleration/hold/decelleration:

cos_power_motor_curve.JPG

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