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Report the distance between two faces

Question asked by Edmond Husseini on Mar 10, 2009
Latest reply on Mar 11, 2009 by Edmond Husseini

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Hi,

I have an assembly on which I have run a Motion Analysis, and I have attached the ZIP file to this post. I am having trouble plotting the distance between two faces as a function of time and I was hoping one of you could help me a little...

If you go into Motion Study 1 and take a Section View using the Front Plane then you will be able to see the two faces in question. I have added two screenshots to make it a little clearer.

The maximum distance apart these two faces go is roughly 90mm, and the minimum is 0mmm when they are in contact. As such the plot should be a graph going from 0mm to 90mm...

Can anyone show me how to accomplish this?

How would one plot the closing speed between these two faces?

Any help is much appreciated!

Edmond Husseini Mar 11, 2009 10:57 AM

Correct Answer

Yeah selecting a circular edge does give the correct result as well, its a convenient workaround. Thanks for your assistance...

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Ian Hogg

Mar 10, 2009 4:57 PM

Hi Edmond,

Create a plot
Select "Displacement, Velocities, Acceleration"
Select "Linear Displacement"
Select "X component"
Seclect the 2 Faces you want to measure between.
The chart will show the distance in the global x-axis direction (which is the direction of movement you have).

The sign convention is based on the order you pick the two faces.

Let me know if you're still having trouble.

Cheers,

Ian

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Edmond Husseini Mar 11, 2009 9:06 AM

Hi Ian,

I tried doing that, and I have attached the resultant plot to this post. The amplitude is correct, roughly 90 mm. It is however offset by a value of -7 mm i.e. the graph goes from -7 mm to 84 mm instead of from 0 mm to 90 mm...

Surely the distance between two faces that are 'in contact' can not be less than 0 mm?

This is becoming frustrating.. something that should be so simple to do is delaying my work.

What am I doing wrong?

Edmond

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Screenshot 3.JPG193.6 KB

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Edmond Husseini Mar 11, 2009 9:51 AM

I have tried placing sketch points at the centre of the two circular faces between which I want to measure the relative distance, and this does give me a correct result graph.

I think what was happening before is that SolidWorks was measuring and reporting the relative distance between the two origins of the bodies, not the relative distance between the actual faces.

Is SolidWorks not able to plot the relative distance between two faces even though they're parallel?

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Ian Hogg

@ Edmond Husseini on Mar 11, 2009 10:40 AM

Hi Edmond,

I see what you mean. That is a incorrect, and I consider it a bug.
When selecting the face it should find the centerpoint on the face and utilize that. It does not appear to be doing that for some reason. Even if the points lie anywhere on the plane of the 2 faces, it should give you the correct result (for you assembly anyway)

Since your dealing with cylindrical faces, just use the circular edges. That avoids the need of putting sketch points on the geometry. I did this and it is providing the correct result.

I'll get the issue logged on the face selection.

Cheers,

Ian

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Edmond Husseini Mar 11, 2009 10:57 AM

Yeah selecting a circular edge does give the correct result as well, its a convenient workaround. Thanks for your assistance...

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5 Replies

Ian Hogg Mar 10, 2009 4:57 PM
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Hi Edmond,

Create a plot
Select "Displacement, Velocities, Acceleration"
Select "Linear Displacement"
Select "X component"
Seclect the 2 Faces you want to measure between.
The chart will show the distance in the global x-axis direction (which is the direction of movement you have).

The sign convention is based on the order you pick the two faces.

Let me know if you're still having trouble.

Cheers,

Ian
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Edmond Husseini Mar 11, 2009 9:06 AM
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Correct Answer
Hi Ian,

I tried doing that, and I have attached the resultant plot to this post. The amplitude is correct, roughly 90 mm. It is however offset by a value of -7 mm i.e. the graph goes from -7 mm to 84 mm instead of from 0 mm to 90 mm...

Surely the distance between two faces that are 'in contact' can not be less than 0 mm?

This is becoming frustrating.. something that should be so simple to do is delaying my work.

What am I doing wrong?

Edmond
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- Screenshot 3.JPG193.6 KB
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Edmond Husseini Mar 11, 2009 9:51 AM
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I have tried placing sketch points at the centre of the two circular faces between which I want to measure the relative distance, and this does give me a correct result graph.

I think what was happening before is that SolidWorks was measuring and reporting the relative distance between the two origins of the bodies, not the relative distance between the actual faces.

Is SolidWorks not able to plot the relative distance between two faces even though they're parallel?
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- Ian Hogg @ Edmond Husseini on Mar 11, 2009 10:40 AM
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  Hi Edmond,
  
  I see what you mean. That is a incorrect, and I consider it a bug.
  When selecting the face it should find the centerpoint on the face and utilize that. It does not appear to be doing that for some reason. Even if the points lie anywhere on the plane of the 2 faces, it should give you the correct result (for you assembly anyway)
  
  Since your dealing with cylindrical faces, just use the circular edges. That avoids the need of putting sketch points on the geometry. I did this and it is providing the correct result.
  
  I'll get the issue logged on the face selection.
  
  Cheers,
  
  Ian
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Edmond Husseini Mar 11, 2009 10:57 AM
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Yeah selecting a circular edge does give the correct result as well, its a convenient workaround. Thanks for your assistance...
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Report the distance between two faces

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