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GENEVA Mechanism

Forum|Forum|12 years ago
June 11, 2014
6 replies
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I want to make "GENEVA Mechanism" in Creo 2.0... so plz help me which type of constrain i use for that...????

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Mechanism Design

Best answer by dbodar

Its done by CAM Mechanism....

In that you must have to define the LIFTOFF...

Value of Liftoff is 0.10

if I take 0.5 than interset are occured. Video Link : 5026

J

jsarkar

1-Visitor

Welcome to this forum,

slot follower mechansim can be appliead definitely by predifing the motion curve and point. I am trying to explore the other methods, please let us know if you can explore new method too. Its a nice mechansim.

Regards,

Jayanta Sarkar

T

TomD.inPDX

17-Peridot

I am wondering if you have to mimic this action with a custom servo motor profile.

D

dbodar

AuthorAnswer

1-Visitor

Its done by CAM Mechanism....

In that you must have to define the LIFTOFF...

Value of Liftoff is 0.10

if I take 0.5 than interset are occured. Video Link : 5026

T

TomD.inPDX

17-Peridot

Nice solution!

How did you figure out the cam profile?

D

dbodar

Author

1-Visitor

If I used 3D contact

than prob occured as shown in video

in this i done dynamic analysis

Video Link : 5031

L

LndoVnBtchmrk

12-Amethyst

Here's a different approach. I did what Tom suggested and used a servo for drive and driven wheels. The driven wheel's motion is defined by tabular data, but it's very accurate.

Always wanted to model a spherical geneva drive. Fun stuff.

Video Link : 5028

T

TomD.inPDX

17-Peridot

Beautiful, Andrew!

D

dbodar

Author

1-Visitor

Can give me to dimension of sperical gevena drive...

or any internet link for dimension...???

T

TomD.inPDX

17-Peridot

Any size you want. A little thought will tell you want has to be done to make the geometry.

Essentially, it is a conical boss (optional) and a pin at 45 degrees from the boss. So the slot has to be 45 degrees vertically as well.

Andrew, can you post the graph for the servo definition you used?

L

LndoVnBtchmrk

12-Amethyst

Models are attached. The data points for the 1st and second driven wheels are attached also.

Here's a segment of the first driven wheel's servo motor profile. The drive wheel just has a constant velocity of 360 deg./sec.

I half derived the equation of motion for the driven wheel, but the third dimension really complicated it. I ended up just indexing the drive wheel and measured the angles directly.