adding pattern feature with correct spacing

[trenthoskings]

The Inventor 2013 file i attached has the EOP rolled up because it is a large size (not many features)...can this be modelled so the part is not so large?

How do i add the pattern also between the diamond pattern in which there will be a half diamond at each end with full diamonds between

What is the way to work out the patterns so that between the diamonds there is same size gap all around the roller?

Regards

Trent

[JDMather]

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@trenthoskings wrote:

What is the way to work out the patterns so that between the diamonds there is same size gap all around the roller?

Regards

Trent

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This will be a function of the circumference of the cylinder.  Can the diameter of the cylinder or size of the diamonds change to make perfect (which one is the controlling parameter)?

[trenthoskings]

Hi

I would like the diameter of the cyclinder to be 162mm and the diamonds size can be changed to make the pattern perfect

Thanks

trent

[rdyson]

Ignoring that you want Ø162mm and your model is Ø200mm, the image shows one way to space the diamonds equally radially:

[trenthoskings]

Hi rdyson

Yes 162mm is the correct value not 200mm after a re-think

Would you have a clearer picture please?

Thanks

[rdyson]

copy image to a new tab, click to enlarge

[trenthoskings]

That is much better....thank you

[trenthoskings]

What caused the file to be so large...would it have been the Emboss feature?

If yes would there be a way to make the part with diamond patterns which would be a smaller file size?

Thank you

Trent

[graemev]

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@trenthoskings wrote:

How do i add the pattern also between the diamond pattern in which there will be a half diamond at each end with full diamonds between

Regards

Trent

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Roll up the EOP marker just above the Circular Pattern.  Create a workplane using the X-Y plane and X-axis as reference geometry and an angle value of 180°/(circular pattern quantity) - "180deg / d26" in your case.  Create a parallel offset workplane just like you did for the first set of diamonds.  Sketch and emboss as before, being sure to reuse existing parameters to keep the diamonds consistent with the first set no matter how they may change.  Roll down the EOP and edit the Circular Pattern feature set to include the second set of diamonds just created.

[graemev]

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@trenthoskings wrote:

What caused the file to be so large...would it have been the Emboss feature?

If yes would there be a way to make the part with diamond patterns which would be a smaller file size?

Thank you

Trent

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I can't speak to embossing generating a larger file size, but you could have done the following as an alternate:

Sketch the diamonds on the X-Y plane.  Extrude beyond the desired final size.  Pattern as needed.  (Include the extra diamonds as mentioned previously, if so desired.) Sketch on the end of the cylinder: a circle of the intended over all outside diameter.  (Parametric linking to your cylinder OD would be a good idea here.)  Extrude-Intersect-All to cut away the excess.

[trenthoskings]

Thanks...you have lost me with the 180°/(circular pattern quantity) - "180deg / d26"...the rest i can do but this part here not sure

[trenthoskings]

instead of adding diamond shapes would also the gaps between the diamond have also worked.Extrude cut out diagonal lines and pattern and then do the same  extrude cut in the opposite direction and pattern giving then diamonds shapes as well

[graemev]

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@trenthoskings wrote:

Thanks...you have lost me with the 180°/(circular pattern quantity) - "180deg / d26"...the rest i can do but this part here not sure

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You're looking to make another set of diamond shapes inbetween the existing rows - half the angle between the rows: 360° divided by the number of rows in the circular pattern, divided by 2.  If you use this equation for setting the angle of the workplane, you can change the number of rows in the circular pattern and the second set of diamonds updates to suit.

[graemev]

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@trenthoskings wrote:

instead of adding diamond shapes would also the gaps between the diamond have also worked.Extrude cut out diagonal lines and pattern and then do the same  extrude cut in the opposite direction and pattern giving then diamonds shapes as well

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Yes, or you could do a pair helical cuts from the end of the cylinder, one right-hand, one left-hand.

There are many ways to skin that cat.

[johnsonshiue]

Regarding why the file is large, it is mainly due to Emboss Wrap to Face. There was an issue in the way the feature was computed before R2015 leading the behavior. If you recreate the feature in R2015, the file size will be greatly reduced (1.2MB vs 7.5MB).

Thanks!

[trenthoskings]

2014 part attached...surely there is a simpler way to create this pattern.If so could someone please post so i can see how it is done

Thanks

[JDMather]

There is a much easier way. 

I will post my solution when I get a chance.

[JDMather]

Open the attached file.

Drag the red End of Part marker down step-by-step to see how I built the model.

[trenthoskings]

Thanks JD

I see how you created,,,very good

One question 

If i change the diameter and width of the roller how do you calculate the correct number of occurrences and diamond sizes so they fit exactly as you have done.

Example: Dia = 160 & Width = 300

Dp ypu use a formula or technique so all diamonds are the same size and equal distances between each diamond

Thanks

[JDMather]

I did not use a formula.

I had intended to tie it all up parametrically - but ran out of time.