Dear Creo users,
While doing some complicated sketch don't you think there is a need of linear and circular pattern options in creo sketch? Its true pattern option is given in solid modelling and we can pattern a feature or group of features. In solid works users can pattern inside sketch mode. in creo 3.0 and 4.0 is there any updates on sketch pattern? I am using creo 2.0.
There is no pattern function inside sketcher in Core 3.0. As far as I know, the workaround is to make a sketch, and than pattern the whole sketch. As a previous SolidWorks user, I find this very annoying.
in Creo 3.0 and 4.0 you also cannot pattern geometry in Sketcher mode.
when do you want to pattern inside a sketch? Seems like you would create an unnecessary complicated sketch? Please enlighten me!
This is PTC's strategy to keep sketch as simple as possible, so no linear or circular pattern. Also there is no need to do so. I have used CATIA sketcher, NX sketcher and Solidworks as well, but honestly speaking Creo sketcher is the fastest.
If you need to use linear or circular pattern, you probably want to have a 2D sketch, and Creo is not meant for this purpose.
Complex sketches is one of Creo's strong points. And I love them. But Sketch patterns were not a concept for early developers and today, there is no push to add it. This would be a serious re-write. Not to mention that the SW version is far from robust. PTC doesn't do anything unless they have the opportunity to make it 10x what SW would have.
What I really miss is "midplane"... just as a matter of convenience. That may have other implications to incorporate.
I am probably not expereinced enough Creo user to give a credible opinion on this, but after more than a year of 10 hours per day in Creo, i still find sketching bad. Offset and project sketch specially. The contour is never ever whole, always space -red dots- between lines. Sometimes even on very simple geometry.
when you offset, do you use "single" , "chain" or "loop"?
When using chain or loop, you shouldnt get any "space " between your offsetted lines . (but yes, it can happen)
I like the complex sketches, too. With some reservations. I've had some devastating failures where the a sketch that I got too ambitious with suddenly went "unstable". Usually this happens with geometry where I have a lot of arcs in a profile with fillets on those arcs, etc. Creo gives me the opportunity to automatically "fix" the sketch, but the fixing seems to be more in the line of how a veterinarian will "fix" your dog. It deletes all the dimensions and leaves me with a random-ish assortment of abstract artwork.
I've learned, through a lot of negative consequences, to not try to be so fancy with my sketches, and maybe break them up into multiple simpler sketches.
Kenneth, have you tried tightening up your precision?
Most work well for me by default at the scale I work.
Could sketcher be improved? Sure!
Will it be improved? Doubtful.
Yes, I've tightened up precision, etc. The trouble seems to be a persistent one with Creo where it seems to get "confused" about tangent arcs and which "side" of them it needs to "keep". Similar to the unpleasant results one gets if they pattern something circularly and attempt to go beyond 180 degrees. Works for a pattern around an axis, but don't bet on it if you want to use a dimension to do it.
Antonius Dirriwachter In creo 4, there is an option for creating a datum midplane (if that´s what you meant by "midplane" , or maybe you were talking about something in sketcher thats missing?)
Any incorporation of a midplane modifier is exiting! Looking forward to it.
Hi all , Don't you think that this sketch can be better drawn by using sketch pattern option if it is in Creo sketch?
I have seen an option called copy and paste special in creo sketch. In this option have anyone tried to rotate a copy of sketch at a specified angle?
Thanks for all your replies. Any other suggestions or discussions will be helpful.
Is there any portion in this community or ways to request or connect PTC Developers about some enhancement that creo users like to request?
Maybe it's a matter of preference or just the way I learned to use ProE but I wouldn't include all that detail in a single sketch feature. Not that it necessarily is but I think I would find it easier to create the ears and the associated holes as their own features or group of features and pattern that. You also lose the advantages a feature pattern can offer although you do have other options you could use for those.
That sketch would be way to fragile. Patterns in sketches are very fragile and limited in SW.
I could easily constrain that part in one sketch without having to go back and try to clean up a messy merge of a pattern in the sketch.
However, I too would use about 4 features patterned in the conventional sense. 2-3 minutes tops... single sketch method, maybe 5.
Sustainability; Multi-feature will win the error search much easier. Feature patterns are easily edited where sketch patterns in SW are not.
I would never try to model that part using just one sketch/extrude.
Like Antonius, I would create about 4 (patterned) features. With the holes in a feature pattern, you will gain the advantage of using a Ref Pattern for your bolts (for example)
See attached file (created in PRO/E WildFire 4)
Regenerate part to determine the number of inner and outer holes.
"SHIFT" will shift the pattern of the outer holes.
Uploaded an improved version...you can now also enter 0 holes 🙂
that sketch will become too complicated,difficult to manage and slow down the computer.
Easier method to simply make a single feature and pattern.
Making sketch simple comes under best practices.
Would not recommend using the pattern tool within Solidworks sketch also..simply because making a fully defined sketch as i want will be time consuming.
You can join PTC technical committee for modelling to give your recommendation.
I use sketches as calculators...
Yes they can be very complex but not for the obvious reasons.
This sketch is very hard to sustain , but it is exactly what it needs to be.
(stellar dodecahedron with the center at the origin and a specific size)
his one sketch governs the entire design with one dimension.
The other two dimensions help is visually manageable.
I wouldn't do it any other way.
As a work-around you could pattern the sketch feature. After that you could create another sketch referencing the patterned sketches.
I often use streamlined "skeleton" sketches that I then reference in a final sketch. This allows me to lock down and simplify the most important relations and then the more intricate details of the final sketch are kept separate. as a simple example, you might have a complex polygon that you want to have radii on. it is much easier to sketch the radii-less polygon and then in a subsequent sketch use edge, pick the loop - and add a bunch of fillets to the sketch.
you might think, well why not keep it simple and in one sketch? actually it's not as simple to have in one sketch. if it fails - you can see where it fails. and for my example, the dragging the radius bigger or smaller doesn't affect the shape of the polygon, etc.
when I need a sketch to have a pattern, I often will create the prototype shape, then pattern it, then create the final sketch and just use edge -> loop.
if you don't like to see separate sketches, then group them.
it works, it works well, and it's just the way this software works. I personally wouldn't mind if there was a way to create patterned sketch features within a sketch. however it would just be a novelty to me. after 20+ years using pro|E / Creo, I can confirm - simple sketches are more robust. and more complex sketches are more robust when broken up into multiple steps.
The attached video shows this 2-sketch method. it's for a complex polygon and a simple radius. if you included the radius in the original sketch dragging would be horribly unwieldy. Anyway - the same concept works for patterns.
So to sum up I conclude that if we pattern in sketch mode
1) Sketch will be unstable and there will be no associativity or connection between sketch pattern members like in feature pattern
2) It will be very difficult to increase the no. of pattern, angle or spacing members after sketch pattern as there are no connection between pattern members.
But for information, I would like to say that in Autocad 2013 to 2017 Autodesk have introduced a property called array associativity. If you select the members after array the array will be selected as a group. You can also explode it and make separate anytime you want. Though I am aware that autocad is primarily a 2d drafting software and nothing comparable to feature-based, parametric 3D CAD software like PTC Creo but if this feature can be applied in creo sketch then one can easily get a feature pattern like sketch-pattern.
What do you think?
I am interested to know what other Creo users think about this.
What about fully defining the complex sketch?How will creo define how to dimension it?
Anyways if you have current maintenance for Creo you can put up this in PRODUCT IDEA.
from my point of view, discussions similar to this one are "academic", only (unfortunately). I think it is better to accept current functionality of software (not only Creo), if someone use it to earn someone's living. I agree with you that any software can be improved, but it is not possible to fulfil every user wish .
Your summation is correct for SolidWorks, yes. Since the feature doesn't exist in Creo, there can be no conclusion other that the fact that if PTC were to build the code for this feature, it wouldn't have those limitations. Maybe a few bugs, but you will find that PTC does a much better job of defining new functionality than SolidWorks. SolidWorks was created in large part by users' -demands- and therefore you have some half baked solutions. In SolidWorks, try patterning your first extrude in the sketch where it creates more than one solid... it can't. Exactly where you would like use it. Sketch patterned features must be a single closed sketch or it has to merge with something if it creates multiple solids. How dumb is that!