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Yet another Thread thread - UTS Implementation

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I just wanted to post a a little helper file for creating internal and external threads based on the Unified Thread Standard (UTS) which covers both English and Metric.

 

I must give high kudos' to Wikipedia.  I borrowed their images and tables for the attached Creo 2.0 full version parametric file.  You will also find a linked link in the site if you turn on annotation.

 

See the relations to drive the pitch and diameter you are interested in.  The file is set up for English but you can change it to metric units, if that is your primary usage.  Most everything that can be driven by relations has been.  Only 3 variables are needed... and TPI (thread per inch) is set to zero if you want to define the pitch directly for metric threads.  See the "IF" statement in Relations.

 

I did have some troubles along the way.  I split up the helical sweep because it -did- fail if I did it in one go although it did not overlap anywhere.  This was customer support's "works as expected" Pro|WorkAround© for helical sweeps that fail otherwise.  This made the file more robust for changing threads on the fly through relations.

 

Of course, I suggest you make a library part of the two sketches in the file and use them liberally.  Otherwise, the file is a nice quick reference for many thread features.  And if you link into Wikipedia, you will find even more excellent information about this standard.

http://en.wikipedia.org/wiki/Unified_Thread_Standard

http://en.wikipedia.org/wiki/ISO_metric_screw_thread

 

Here are some of the highlight images from the file... turn off planes and CS' and turn on Annotation, Axes, and Points. 

The images should be saved in the file so no external reference issues should exist.

 

thread_standard.PNG

 

These are the actual "thread cutters"...

 

thread_standard_closeup.PNG

 

This is the structure of the file...

thread_standard_file.PNG

 

And I love intelligent parametric sketches...  yes, I have the rounding turned off on purpose.

 

thread_standard_section.PNG

 

If you find a serious bug, let me know.  Otherwise, enjoy!


Part template for geting overall dimensions

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If you want to get overall dimensions automaticly into your drawing tables here is a way to do it.

You can make relations in part template or assembly template that will handle asigned dimensions and convert them into parameter that drawing table raports. Any changes on those part dimensions with regen will reflect in raported parameter.

Basicly template has relations in initial relations and post regeneration.(Open template.prt and look in relations)

Combinations of what can parameter("GABARIT") for overall dimensions show with this template are:

AxBxC 

AxB S Sheetmetal Flat

AxB L S Hollow Bar

AxB L Bar

FixL S Pipe

FixL    Circular profile

 

DEC in initial ones defines the how many decimals parameter will have.Just add zeros or remove them.

 

You can always copy those relations in your template and use diffrent name for parameter.

 

Hope someone finds this usefull.

 

Cheers

PTC Greo 3.0 Deutsch

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Kann mir jemand helfen?

Ich habe PTC Creo 3.0 auf meinem Computer installiert. Eine englische Version aber ich brauche deutsche.

Wie kann ich denn bitte die Sprache von Englisch auf Deutsch umstellen? Oder muss ich schon während der Installation Deutsche wählen?

"Compressed" Fastener library

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Since Creo Parametric comes by default without fastener or standard parts library most of us had to download/make those by our self. Major problem is that you have to download different part for different standard and size so in the end you end up with huge pile of files. And every time you start new assembly you have to add those parts in given folder or use link to library via search.pro/config.pro. Last few years I`ve made lets say "compressed" fastener library made up of only 3 files/parts. Basicly you have screw,nut and washer part and each one is actualy one big family of parts.

So now you can just copy these 3 in working folder and you are done.

 

Supported standards and dimensions of fasteners are given in PDF file.

All fasteners are given with cosmetic thread by default but real thread can be turned on by unsuppresing "NAVOJ"(Bolt) or "FIZICKI NAVOJ"(Nut) in model tree.

 

Unfortunately I was too lazy to translate features or parameters from Serbian to English but then again I would have to do it every time I update these parts and enlarge family tables. Also versions of these fasteners I use myself have more standards(Luftnormen for example) in them  but i can`t give those.

 

Hope you find these usefull...

 

More standards have been added and some corrections of mistakes found in prior version.

 

 

 

6.7.2014 Update

 

I enlarged library last time for Creo 2.0 version. On 3.0 fasteners come by default so its a bit redundant except for maybe illustrations because of 3D thread.

 

 

 

4.8.2014 Update

 

Countersink bolts/screws had incorrect lenghts - corrected now. Placement interface works now for CS bolts and normal ones fine.

 

17.12.2014 Update

 

Corrected lenght for DIN97.

Creating Static Manikins

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Have you ever need a larger population of manikins for a scene?

 

I downloaded DAZ Studio 4.7 Pro Beta which is free at the moment.

 

It is very much like Poser and has some very sophisticated capabilities for a free offering.

Of course, a lot of it is a teaser, but what you get is fully functional.

 

What I found useful is the ability to make some pretty realistic manikins with expressions and gestures with a relatively intelligent interface. 

You can pose them and morph them; dress them and manage them in countless ways.

 

And the great thing is, you can export them to an object file format and control how it scales and how how many features it creates in an intelligent manner!

 

Once you bring this into Creo, you have to save out each facet feature you want to assign a different color to.  You re-assemble your object in an assembly all using the default origin.  Now you have a color assigned to what DAZ 3D considers unique surfaces.

 

No texture mapping or color assignments come across in .obj files... and Creo won't let you do anything with facet files other than assign an overall color

 

But, you can open the file, be it a person or a full scene, and you can save out many copies to be re-assembled.  I included the child's head as a sample.

 

I included the model as it came in from the .obj format (childs_head.prt) and I turned off the cornea (needs to be translucent).

You can save this model as a .wrl (VRML) file and your new color assignment will remain, even if you import this as a new .prt file.  Unfortunately, transparency won't and that is why the cornea is hidden.

 

Anyway, if you've been searching for a nice manikin generation tool, this might not be th eonly one, but it is an option and for now, it's free.

If you have another candidate tool to do this or some tips for preserving colors, or even texture maps with the import, that would be excellent!

 

manikin_adds.PNG

 

Edit: due to my serious lack of artistry to create flesh tones on the fly, please find attached a color pallete based on this swatch:

http://m9.i.pbase.com/o2/50/88850/1/105147199.kNJ7Zwz1.Bruce_Beard_Skin_Color_Chart.jpg

How add default bend radius?

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Hello everyone!

 

I am beginner hear so pleas be patient with me.

 

I would like to have set defaulty bend radius taken from my bend table. In previous ProE it was BY PARAMETER. In Creo2.0 option does not appear.

 

Pleas help!

Change Formats in old drawings!

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Hallo!

 

I have to change my formats in to new version.

What is the quickest way to change it in all my old drawings? Now I have to open each one and change format.

 

 

Is there better way?

How to save an animation to a PDF file


Creo Parametric Rants & Die-Hard Users

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It will give you a more accurate insight into my ranting if I prologue this with the fact that Pro/E-Creo Parametric is the only PTC product I am addressing in this writing.  I don’t use Windchill or any other data management program with Pro/E-Creo.

 

I have used Pro/E since the early 90’s.  At the time it was so far ahead of AutoCad that there was no comparison.  Suddenly I was able to model and update drawings for pressure vessels and structures, calculate minimum thicknesses, accurately detail and dynamically (“parametrically”) represent geometry.  The amount of fabrication time and errors this saved is almost immeasurable.  For years, I found the challenge of fulfilling client’s design challenges easier with Pro/E than with anything else available in the CAD market.  I have even obtained patent’s based on designs with 3D geometry developed in Pro/E that (at the time) no other modeling program was capable of (except by archaic triangulation methods that were not as accurate as they needed to be).

 

As challenges increased (as they inevitably do) I was always running into limitations.  But I could always discuss issues with a US based knowledgeable PTC user/engineer and develop a process or number of steps to get to a workable solution.  This has changed.  This has been my first level of disillusionment  and my primary concern with PTC.  Although the Knowledge Base access and Help files have improved, other CAD providers have left Creo Parametric in the dust with their truly dynamic hint and usage pop-ups and windows, and complete and illustrative explanations of how to use each capability.

 

In college I took a class in Assembly Language Programming.  In terms of computer programs, I could eventually accomplish anything.  It was not intuitive, nor elegant, but it could always (one way or another) get the job done.  For years, Pro/E was the “Assembler Language Programming” of CAD… not intuitive, nor elegant, but it could always (with a little finesse) get the job done, and usually better than anything else.  Just as Assembler Language Programming has given way to many more intuitive and easier to implement methods of programming, Pro/E has been challenged by other more intuitive and (questionably ) capable CAD packages. The field of various 3D kernels (the 3D component underlying all CAD programs) has expanded and somewhat equalized, and each has their benefits (usually accuracy, methodology, and implementation)…and limitations (usually error recovery).  The real issue is the rate by which a design challenge can be met.  The real implementation of meeting that challenge is in the intuitive and efficient (efficient in this case means the clear knowledge of how accurate and appropriate the result is) interface of the user with the software.  If the software you are using does not have an intuitive, practical, efficient and useable interface…then you must customize it.

 

For as long as there have been computers with QWERTY keyboards for an interface, there has been an inherent limitation to interfacing with software.  The QWERTY key layout was supposedly developed specifically to slow down the typing process to account for the limitations in mechanical typewriters.  The Dvorak Simplified keyboard layout can potentially be much more efficient, quicker, and reduce strain.  Yet we are virtually stuck with the QWERTY keyboard – being supplied with every new computer.  Early word processors, spreadsheets, and CAD programs had various means (e.g. function keys F1-F12) of accessing menus (access to the series of steps needed to accomplish any given task).  Microsoft, as well as others, resorted to the “Ribbon” to provide a reasonable and more intuitive interface with word processing and spreadsheets.  For these programs, the Ribbon has served adequately…if not well.  It was inevitable that CAD programs would resort to the same attempt at an intuitive interface.  We are virtually stuck with the Ribbon interface, just like the arguably archaic QWERTY keyboard.

 

Well, you can customize your keyboard (if you really want to), and guess what, you can customize your interface with CAD software as well.  But doing this does not mean customizing (only) the Ribbon.  Macros bypass most of the need for Ribbons in CAD software.  In the case of Pro/E-Creo, the tool to do this is Mapkeys.  Getting proficient at creating Mapkeys is a skill, and is unfortunately underutilized by most.  My rule is…if I find myself doing the same series of steps 3 times each time I get into Creo…create a Mapkey.  Mapkeys are also the foundation of customizing the Ribbon.  For a series of steps I use once-in-a-while (assign a material, change number of decimal points, change between fractional and decimal dimensions, etc.) – create a button in the Ribbon to execute a Mapkey.  For a series of steps that I use frequently (view shaded, view hidden, etc.) – create a Mapkey for two or three button keyboard execution.  For those steps that I perform repeatedly (turn datum on or off, points on or off, change view orientation, save file, etc.) – create mapkeys that are triggered by a button on my multi-button mouse.  This is how you tap into the functionality of interfacing with your CAD software…and into real gains in productivity…by customizing the interface to be intuitive for YOU.

 

If you are going to complain about the Ribbon interface, and you have not really tried Mapkeys, you might as well go get a job that does not involve Pro/E-Creo.  You can complain about the trials of implementing mapkeys (and the lack of support for continuity of mapkeys between version upgrades).  But once you have properly incorporated Mapkeys into your routine use of Pro/E-Creo, the irritations of the Ribbon interface become inconsequential and not worth mentioning.

 

Yes…Mapkeys are the path to intuitive productivity in any version of Pro/E-Creo…but they are not without their quirks.  I have a list of over 100 Mapkeys .  I had occasion years ago to attend a presentation by James Heppelmann – who stated at the time that the transition from Wildfire to Creo was designed to be seamless and trouble-free.  I wanted to stand up and tell him it wasn’t quite so.  I had just spent over two (unanticipated) weeks re-creating about half of the Mapkeys I had developed and used for the previous two years.  They had become ‘functionless” as a result of the changes in some of the Mapkey commands.  Seamless…and trouble-free…bull----!  But once I had re-created and edited my collection of mapkeys, productivity was in fact, even better than before.

 

The path to increased productivity is not always without its hurdles.  There was a similar hurdle in transitioning from Creo 1 to Creo 2.  Sometimes it is best to get into Pro/E-Creo, execute the steps you want in your Mapkey, then exit the program.  Locate and extract the desired steps from the trail file and edit them into a Mapkey.  Even a “normally” created Mapkey will often have unnecessary commands – which can be edited out to speed it up.  And why (in this world, in its current level of technology) would anyone put Mapkeys (macros) in the same file that now contains hundreds of configuration setting? – Here’s a legitimate item to add to the list of “MOST ANNOYING THINGS WITH CREO”

 

Mapkey implementation needs work, but regardless of the irritations – it’s worth it.  Once you embrace this approach, for the first few days you will create 1 to 5 macros a day, then 1 to 5 macros a month, then 1 to 5 macros a year.  If I spend a whole day on one Mapkey (creating, editing, testing, refining), if well implemented, it always reaps benefits in the time it saves in the future (at least till the next version upgrade).  You will usually use a few minutes each time you create a Mapkey that will save you accumulated weeks over-all.  There are a few series of steps that are difficult to Mapkey, and even a few that are impossible.  My approach has always been to assume that it can be done until I prove that it can’t (as opposed to assuming it’s just too difficult to try).

 

So as I read (almost every day) the entries in MOST ANNOYING THINGS WITH CREO concerning the Ribbon and some other dysfunctional areas of Pro/E-Creo, I always fight the urge to respond with “either go use the other software – or create yourself a Mapkey!”

 

3D modeling can be the backbone of any project.  I have never seen the failure of a project (a client design challenge) based on too much accurate 3D modeling.  I have witnessed many times, broken (and failed) projects, as a result of inadequate or inaccurate 3D modeling.  However, the necessity of 3D modeling is no longer limited to geometry.  Customize your start part and start assemblies with the parameters you know you will need (remember I’m not using Windchill).  Create parameters that have an origin date, revision and revision date, drawing note(s), etc., that you will use at any stage (design, refinement, detailing, identification, fabrication, destination, etc.).

 

The curve is less and less diverse in terms of ease and accuracy of 3D model geometry among the various CAD packages.  Now that the challenges of 3D geometry has seemingly been met, everyone is addressing the fact that they already knew…there is a lot more than geometry that needs to be incorporated into the model.  Thus the attention has shifted…from the geometry of the 3D model…to all the information that can be incorporated into, and extracted from it.  There have been databases since before the inception of the electronic computer.  Nowadays 3D models are what relate all that numerical data to the real world (until the 80’s it was either the scale model or prototype).  They are what eventually becomes tangible and physically functional.  Much has been created in recent years that could not before, because it has been able to imagined, and then created with a mathematical model inside the computer.

 

PTC was once the most powerful and capable (compared to anything else) 3D modeler (let alone parametric) available (it possibly still is – it just lacks a competitive innovative interface).  Now that there has been a shift towards managing all the related data (PTC’s Windchill wishes to be the best example) there seems to be less motivation to further develop a truly innovative and intuitive interface for 3D modeling, or even to address issues with the existing interface and capabilities.  The number of entries and subjects under just one discussion “MOST ANNOYING THINGS WITH CREO “ reveals this.

 

It used to be that our sales people would impress clients with the fact that we use Pro-Engineer (and not even mention that we also use Autocad, SolidWorks, and Tekla).  Now, SolidWorks is mentioned – mostly because everyone at least knows of it.  We seldom mention that we use Creo – because we have to further explain that Creo used to be Pro/E…and what was Pro/E? – compared to Solidworks?

 

For us die-hards… I will continue to use Creo, endure the taunts of SolidWorks users, continue to refine my Mapkeys, and resist the urge to respond to many “MOST ANNOYING THINGS WITH CREO “ entries with “either go use the other software – or create yourself a Mapkey!”.

 

I finally quit submitting anything to PTC’s “Product Ideas”.  What’s the point when it takes years for PTC to even indicate if it is something they will or will not consider…how long should one be hopeful, or finally know that you will always have to do a “workaround”.  I subscribe to PTC Technical Support Subscriptions.  It is often a source of hints, cures and techniques to deal with software quirks, and sometimes to find helpful but otherwise “hidden” config.pro options.   It has also become a discouragement that as a line item in some articles addressing submitted issues, under “Resolution” there is the entry “Kindly log an idea at Product Ideas @ PTC Community”.  Why would you log an idea if it takes over a year to know if it is ever going to be considered (let alone knowing if it is not going to be considered, or when it might be available if it is).

 

In the early years, PTC seemed anxious to jump on and implement any reasonable ideas – it kept them ahead of their competitors.  Now it seems more important to PTC to simply offer workarounds, and submitted “Product Ideas” must apparently win a popularity contest (rather than be considered on merits as a productivity enhancement or practical aid).

 

There are also some very legitimate issues brought up in “MOST ANNOYING THINGS WITH CREO “.  For these issues, and the many good points suggested under “Product Ideas” that have been there for years without any indication from PTC as to their possible dispositions, I pray that PTC will not completely lose touch with the foundation that enabled them the opportunity for their clients to have a need for Windchill.  Creo is still at the top in the list under Product Families on PTC’s website, but it seems to have taken a back seat in terms of client fulfillment.

 

Respectfully,

 

Aaron Daniel

Differential Drive for Micro-Manipulators

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This is a quick rendering of a differential screw mechanism.

 

This is a M10x0.45 screw driven against a M8x0.4 thread.

This makes for 0.05mm motion/revolution.

 

Great for micro-manipulation projects.

 

 

Here's a little different perspective:

 

Simulated Fluid Flow for Presentations

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Have you ever needed to create a presentation where you wanted to show fluid flow ?

 

Here is an interesting technique using mechanism to create a fluid flow simulation.

 

The idea is simple enough; create a basic "swirl" geometry...

 

FluidFlow_element.PNG

This is a simple helical sweep following whatever shape you want the fluid to follow.  In my case, a simple conic.

 

Save a copy of your "vane" using the Mirror Part option.

 

I used an assembly to pattern the single vain. 

For some reason, patterning failed within the part file, so to simplify the overhead I made this assembly and one like it with the mirrored vane.

 

FluidFlow_asm.PNG

 

In the next-level assembly, both the original and the mirror version are assembled on top of each other.

In the Mechanism application, you can use either a motor or a gear connection to rotate these assemblies in opposite directions.

 

 

 

FluidFlow_mechanism.PNG

I also applied a glass appearance.  This makes for a profound effect when you use the Shade with Reflections for your annotation.

Just remember that transparency can add a huge overhead to your graphics processing.  The above image has transparency disabled in Options.

 

Here is the mechanism animation comparing use of lower quality graphics in Shaded mode and HQ settings and Shaded with Reflection selected:

 

 

Flow rates are easily managed with Mechanism and volumes can be simulated with the initial geometry.

 

Remember to use HD setting in YouTube.

 

Enjoy!

How to Make Splines.docx

Creo 2.0 Sheetmetal - Simplified Reps for flat pattern drawings

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The flat pattern feature is persistent about being the last feature in a model tree.  There is a way around this using simplified reps.  This work-around is specifically geared toward maintaining a master rep as you default assembly part where the sheetmetal part remains in the formed condition by default.

 

This technique uses the bend back feature -after- the flat pattern.  It is a similar method to using unbend and bend back but it was requested to study this option using the flat pattern feature.

 

This is not a good technique for forms.  You will note in the video that the flatten forms option is specifically not selected.  Note that forms can be flattened as a separate operation, but in a simple technique where the master rep should be the master part, this is not as simple as defined in this document or this video.

 

Please feel free to add comments and further the discussion.

 

And I apologize for the video quality overall.  It is the best I can do with the tools at hand.

 

The video aims to:

  • show how to add a bend back feature after the flat pattern feature using simplified reps
  • show how to make a drawing with both types of views using the simplified rep
  • show how to toggle the two states using the display state (all) feature
  • show how the default assembled model is the as-fabricated part.

 

Improve performance showing axes on large drawings by showing only the axes of the top model

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There is a new config option is available:

 

show_axes_by_view_scope

 

With that option selecting axes in the datum tab of the "Show Model Annotiations" dialog (see below) can be configured to show only the axes of the top model, not all the axes of the e.g. 50000 submodels.

  • all_sub_models (the default value)
    • All axes of all submodels are shown which is slow for comprehensive models
    • This is the default behavior in the datum tab in the Show Model Annotation dialog and leads to not responding sessions
    • Example of time consuming display of a lot of axes with that config setting:



  • top_model_only
    • Only the axes of the top model are shown (which is fast)
    • This setting prevents not responding sessions on large drawings

 

 


 

This implements the idea 1314 with the solution suggestion "Idea A" described here:

Keep Creo Elements/Pro responsive when "Show Model Annotiations" for all datum features is selected on a comprehensive drawing view

 

There is still Idea B to improve the performance keeping the actual default behaviour:

 

Implement a stop button, to cancel that action if Creo Elements/Pro does not respond in that situation. Try to use the existing stop button which can be used e.g. during model retrieval.

 


 

Tested with Creo Elements/Pro 5.0 M230

How to upload Creo (or other) files

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Click Use advanced editor link (top right corner of Reply window).

 

Then click Attach link (bottom right corner of Reply window).

 

Select the file.

 

Scroll down to the bottom of the web page.


Click Add Reply button.


Equations for Curves (and more)

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I wish I had found a list like this a few years ago.  I've searched the web and compiled the following list for your enjoyment.  Many are probably considered basic with a few very cool, complex curves thrown in.  The list is divided into the coordinate systems that you will have to choose when creating the datum curve.

 

To initiate the command that will allow you to try these, go to Insert>Model Datum>Curve>From Equation. 

 

After the Equations section see the section title Links to find PlanetPTC discussions and videos that have demonstrated and, in some cases, explained the curve from equation command in more detail with ways to incorporate relations and parameters.

 

Attached is a Creo Elements/Pro 5.0 part file with all of the equations included.

 

In the comments, please share any equations or links that you know.  Other suggestions are welcome, too.

EQUATIONS

 

Cartesian Coordinates:  x, y, & z

The z variable is not necessary, but when used will give the curve that extra dimension. If in doubt, try z = t*10.

Sine

Cartesian coordinates

x = 50 * t

y = 10 * sin (t * 360)

Rhodonea

Cartesian coordinates

theta = t * 360 * 4

x = 25 + (10-6) * cos (theta) +10 * cos ((10/6-1) * theta)

y = 25 + (10-6) * sin (theta) - 6 * sin ((10/6-1) * theta)

Involute

Cartesian coordinates

r = 1

ang = 360 * t

s = 2 * pi * r * t

x0 = s * cos (ang)

y0 = s * sin (ang)

x = x0 + s * sin (ang)

y = y0-s * cos (ang)

Logarithmic

Cartesian coordinates

z = 0

x = 10 * t

y = log (10 * t +0.0001)

Double Arc Epicycloid

Cartesian coordinate

l = 2.5

b = 2.5

x = 3 * b * cos (t * 360) + l * cos (3 * t * 360)

Y = 3 * b * sin (t * 360) + l * sin (3 * t * 360)

Star Southbound

Cartesian coordinate

a = 5

x = a * (cos (t * 360)) ^ 3

y = a * (sin (t * 360)) ^ 3

Leaf

Cartesian coordinates

a = 10

x = 3 * a * t / (1 + (t ^ 3))

y = 3 * a * (t ^ 2) / (1 + (t ^ 3))

Helix

Cartesian coordinates

x = 4 * cos (t * (5 * 360))

y = 4 * sin (t * (5 * 360))

z = 10 * t

Parabolic

Cartesian coordinates

x = (4 * t)

y = (3 * t) + (5 * t ^ 2)

z = 0

Eliptical Helix

Cartesian coordinates

X = 4 * cos (t * 3 * 360)

y = 2 * sin (t * 3 * 360)

z = 5

Disc Spiral 1

Cartesian coordinates

/* Inner Diameter

d = 10

/* Pitch

p = 5

/* Revolutions

r = 5

/* Height; use 0 for a 2D curve

h = 0

x = ((d/2 + p * r * t) * cos ((r * t) * 360))

y = ((d / 2 + p * r * t) * sin ((r * t) * 360))

z = t * h

Butterfly

a=cos(t*360)

b=sin(t*360)

c=cos(4*t*360)

d=(sin((1/12)*t*360))^5

x=b*(exp(a)-2*c+d)

y=a*(exp(a)-2*c+d)

Fish

a = cos (t * 360)

b = sin (t * 360)

/* As "c" increases the fish gets fatter until it transforms into a figure 8.

c = 10

x = (C*a-20*((b)^2)/1.5)

y = c * a * b

Cappa

/* "c" is a scaling variable

c=20

/* Revolutions

r=1

/* Height

h=0

x=c*cos(t*r*360)*sin(t*r*360)

y=c*cos(t*r*360)

z=t*h

Star

/* "a" & "b" are scaling variables

a=2

b=2

/* If, r=2/3 ----> astroid

/* If, r=2 ----> ellipse; when a=b, its a circle

/* r cannot equal 1

r=2/3

x=a*(cos(t*360))^(2/r)

y=b*(sin(t*360))^(2/r)

z=0

Bicorn

/* "c" is a scaling variable.

c=5

a=cos(t*360)

b=sin(t*360)

x=c*a

y=c*(a^2)*(2+a)/(3+b^2)

Talbots

/* "c" is a scaling variable.

c=10

a=cos(t*360)

b=sin(t*360)

x=C*a*(1+exp(2)*(b^2))

y=C*b*(1+exp(2)*(b^2))

 

 

 

Cylindrical Coordinates:  r, theta, & z

Spiral

Cylindrical coordinates

r = t

theta = 10 + t * (20 * 360)

z = t * 3

Circle Spiral Column

Cylindrical coordinates

theta = t * 360

r = 10 +10 * sin (6 * theta)

z = 2 * sin (6 * theta)

Helical Wave

Cylindrical coordinates

r = 5

theta = t * 3600

z = (sin (3.5 * theta-90)) +24 * t

Basket

Cylindrical coordinates

r = 5 + 0.3 * sin (t * 180) + t

theta = t * 360 * 30

z = t * 5

Disc Spiral 2

 

Cylindrical coordinates

R = 50 + t * (120)

Theta = t * 360 * 5

Z = 0

Apple

Cylindrical coordinates

a = 10

r = a * (1 + cos (theta))

theta = t * 360

 

 

Spherical Coordinates:  rho, theta, & phi

Butterfly Ball

Spherical coordinates

rho = 8 * t

theta = 360 * t * 4

phi = -360 * t * 8

Spherical Helix

Spherical coordinates

rho = 4

theta = t * 180

phi = t * 360 * 20

UFO

Spherical coordinates

rho = 20 * t ^ 2

theta = 60 * log (30) * t

phi = 7200 * t

Unnamed

Spherical coordinates

rho = 200 * t

theta = 900 * t

phi = t * 90 * 10

 
 

 

 

 

LINKS

Peruse the links for more equations and explanations as to how they work.

 

Web Links

 

  1. Involute Gears
  2. Power Tools: Curves by Equation
    1. This gives details about using Pro/E dimension references in the equation to give it a parametric touch.

 

Links to curve-from-equation Discussions on PlanetPTC:

 

  1. Curve from Equation Sample for Newbies
  2. Capto
  3. How to Create a Curve from the Equation? Does Anybody Know?
  4. Datum Curve from Equation Driven by Parameters
  5. Constant Force Spring Model
  6. Involute Helical Gear Geometry

 

Links for related PlanetPTC content:

If you think curves from equations are cool, then the following is right up your alley.  These delve into the use of variable section sweep and the trajpar variable.


 

  1. From E-learning with Vladimir Palffy
    1. http://communities.ptc.com/blogs/vpalffy/2011/02/09/user-defined-springs
    2. http://communities.ptc.com/blogs/vpalffy/2011/11/27/sweep-and-trajpar
  2. Fun with Helical Sweeps and Trajpar
  3. Conch Shell in Creo Parametric
  4. How to Create Twisted Wires

 

Using Creo View models in PowerPoint

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The attached document guides how to embed a Creo View control object to a PowerPoint presentation. This way you can view, rotate and use other Creo View functionalities on a 3D model in a PowerPoint presentation.

Free Download (PTC-Creo) doesn`t work

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Hello!

 

When i want to download the 30 days free Version of PTC Creo, everytime the field with "no Connection with the Server" appears on the Desktop.

I have deactivated the anti virus software and i have opened all ports.

 

Can anybody help me?

 

best regards

Max

Did you know how to show hidden KEs inside the sketcher?:

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When in sktech mode, you are not able to make hidden elements like sketches with the normal rightclick visible. it is deactivated.

BUT, when you include this in your shortcut bar, you can make all that stuff visible without leaving the sketcher!

 

HINTx.jpg

Did you know: You can move this toolbar in Creo 3.0?

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Just try to drag and drop.

Sometimes it is over stuff you want to select or in other cases you need it closer to the 3D-Model

didyouknow1.jpg

 

Now it moves:

didyoulknow2.jpg

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