In the past a job as mechanical designer was a little bit of more hard work to do becasue products were first drawn by hand using large sheets of paper and many hours to put all the technical and geometrical specification on it which then had to be used in production. Today things are completelly different. Many CAD platforms are available which not only make the designer’s work faster but it even create a lot of enthusiasm for young engineers which are attracted by the software interface and how intereactive and full of satisfaction this work is.
Every company worldwide involved in mechanical product development use at least 1 CAD platform to develop new products. Depending on the specific of the designed products and the software licence price companies choose to develop their products with such CAD softwares. One of the most frequent used is without a doubt the poverful CATIA V5-V6 from Dassault Systemes. But it’s just a matter of prefference becasue it’s amost impossible to evaluate and say exactly which CAD software is the best.
You can achieve extraordinary results with all. Only the interface and workflow is different. So with this post I am going to start sharing about the design power of the remarcable CREO Parametric 6.0 from Parametric Technology Corporation (PTC).
This is a very basic exercise but essential, very often used in complex part design process. Let’s see how it works.
Obviously whenever you want to creat a part like in any other CAD software, in Creo too, you start by clicking the “New” icon and in the dialog box tick the option for “Part”, name your file and click OK.
Creo will put you in Model Mode where you have all the necessary ribbons and oprions to create a new part. In this example I show you the option “Extrude”.
In the Shapes ribbon click on “Extrude” Icon and Creo will guide you in the Extrude mode where you can define the extrusion parameters. So just click the placement tab and follow the steps as shown:
Creo will then put your screen in Sketch mode. It can often happen that the view is not parallel to the screen, so in the View ribbon click the Sketch View icon.
Then click the “Rectangle” icon and draw a shape as shown. Creo will automatically generate weak dimensions in blue color which can always be addjusted afterwards.
Once the rectangle is ready, yo can either modify the dimensions individually by dirrectly clicking on the dimension value and type the value you want (or you can use the “Modify” icon which gives you a fine-tune control option as well).
Or you can select all the dimensions and then click on modify icon and you can fine-tune your design as you wish.
For example entry the dimensions as shown. If your rectangle is not really centered versus the reference axis you can easily do this by creating a “Centerline” and put everything related to it. So create one verical and one horizontal center line and make your rectangle symmetric to the horizontal centerline. To do that, just click 2 end points of a vertical line and then click in “Symmetric” icon. Creo will adjust your rectangle accordingly.
From here you’ll continue with the sketch definition. Draw a “Circle” approximativelly as show and modify its diameter as shown. (at Ø60mm)
As long as you don’t see a full section as Creo by default puts it pink colored, when you only see a wireframe, that means your sketch is incomplete therefore you can not use it to generate a part. You must continue the dress-up. Because you circle makes the sketch undefined you click the “Delete Segment” icon and clean it up as shown.
Your final sketch must look like this:
A very useful option after the sketch is clearly defined is to lock all the functional dimensions, in order to prevent their modification by mistake. For this do a Left click on the dimension and use the “Toggle Lock” icon to lock (or unlock) its value.
Before to exit the Sketch mode is always useful to check your work one more time, so click on “Feature Requirements” icon as shown and Creo will tell you if everything is OK or not. If your sketch is appropiate all the Requrements in the dialog box will be ticked with a green sign; Click “Close” and click OK to exit the Sketch mode.
STEP 7 :
After sketch definition Creo will put you back in Extude Mode, where you can still adjust the rest of parameteres, in this case the length of your part. Type for example 117mm and click OK.
This is your Extruded part.
In case you want to modifiy something later, you can always to this. As the Extrude is added in the specification tree, left click on it and then click on the “Edit Dimensions” icon and Creo will allow you to adjust the part as you wish.
To close the file you’ve just created, you have to option to “Close” as displayed, but in this case your part is just not displayed but it still in session. To close it completelly and remove it from your working session you must click on “Erase Not Displayed” option from Manage Session and click OK. Like that your part is completelly closed.
A video with this exercise is available on my YouTube channel embedded as follows: