This week’s Did You Know, provided by our Director of Product Management Paul Sagar, teaches users how to create helical sweeps for springs using the sweep tool in PTC Creo Parametric. With this tool and its dashboard interface, creating springs is quick and easy. Paul shows us how to do so in three easy steps:
Step 1: Start Sketching the Spring’s Profile
The helical sweep tool is located in the Shapes group of the modeling tab, under the Sweep Type drop down.
The sweep type drop down menu
After the helical sweep dashboard opens, go into the References tab and click Define to begin sketching the profile of the spring.
In this example, we’re going to sketch the spring’s profile on the FRONT datum plane in a 2D orientation.
Step 2: Define Spring Properties
First, define the spring center line. This will be the center axis of the spring (the axis of revolution).
Defining the axis of revolution on the center line
Next, add a vertical line to the left of the center line to represent the profile of the spring. This will be the diameter of the spring defined through the center of the spring’s wire. Complete the profile sketch.
Now define the Helix section by choosing Create or Edit Sweep Section in the dashboard.
The diameter of the wire will be sketched at the start point of the profile, using a circle. But you can use any shape you need.
Step 3: Add Relations
The helical sweep dashboard makes it easy to edit the pitch value of the spring, or toggle the spring from a right hand to left hand turn. The finished helical sweep will be seen dynamically on the screen. Complete the feature.
To finish the spring however, we want to make sure the spring maintains six coils no matter how much it’s expanded or compressed. To do this, we’ll need to add a relation to the part.
Adding relations to ensure this spring has six coils
This relation will be used to control the spring’s pitch as it expands and contracts. Go to the Tools tab and open the Relations Dialog box. We can see that the height of the spring is D1, the pitch is D2, and the diameter is D0. We need to write a relation that says the pitch equals the height of the profile divided by 6. This will ensure that the spring always has 6 coils.
Now we can test it by editing the height dimension to compress and expand the spring.
The final product: We can continue to compress and expand the spring without changing the number of coils
For more in-depth product feature explanations, visit our Tech Tipsarea.
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In case you missed it, here are our recent Did You Know posts: