ONSHAPE TUTORIAL
ONSHAPE TUTORIAL
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Parametric modeling is an advanced 3D design approach used in CAD software like Onshape. It involves creating models by defining and controlling geometric relationships between elements, using parameters such as dimensions, variables, and constraints.
In Onshape, parametric modeling allows designers to create intelligent and flexible designs. By setting up relationships between sketch entities and features, changes to one part of the model automatically propagate throughout the entire design. This ensures design consistency and streamlines the iterative process, enabling designers to explore multiple design variations efficiently.
With Onshape's parametric capabilities, engineers and designers can easily modify the model's dimensions, adjust design parameters, and perform what-if analyses without the need to manually update each component. This approach greatly enhances design productivity, facilitates collaboration, and promotes faster decision-making in various industries, including mechanical engineering, product design, and architecture.
Onshape's parametric modeling empowers users to create and modify designs with precision and efficiency. It enables intelligent design relationships and real-time updates, making it an invaluable tool for professionals seeking to optimize their design workflow and create sophisticated, customizable 3D models.
Orientation Through The View Cube (UCS)
Orientation Through The View Cube (UCS)
If you understand how the standard views of an orthographic projection are developed you are well on your way to understanding the views presented through the view cube, also known as UCS which stands for user coordinate system. When working in 2D projections you develop views that would be as if you are staring directly at a face of your model. The standard views of front, right side, and top, are views you can click on the view cube and your model space will orbit so that you are looking down at that view. You can also click on the corners of the cube so that you are looking at your model in an isometric view.
These views also act as planes that become the surface that you can draw on. They all intersect at the origin point which can also be thought of as the start of the X, Y, Z axis's. One of these planes are where you will begin the first sketch of your drawing.
Steps to Creating a Model
Steps to Creating a Model
To start modeling in 3D you need to start by drawing a sketch in 2D, think of this as drawing one of the orthographic views. Once you have that drawn you begin to put constraints on your drawing. Constraints tie aspects of your drawing to other things. These include things like dimensions and coincident. Constraints define your drawing and allow it to be a parametric model because if everything is linked together with constraints then when you change a value all the others will update to ensure that everything still meets the constraints.
Once you have a completed sketch of one side of a model you can begin to turn it into 3D. To do this you will extrude (press/pull) your sketch to have depth in a perpendicular direction. This turns your sketch into a part model and you can continue you manipulate it by adding more sketches, removing parts of it, combining it with other parts, and adding a material type to name a few. The extrude feature is the first step into true 3D parametric modeling, and the start of 3D engineering design.
Drawing sheets in technical drawings serve as a canvas for presenting detailed designs and vital information. The title block, located in the lower right corner, contains essential details such as the drawing title, number, scale, units, author's name, company information, drawing size, revision history, and date. This centralized section offers quick reference, aids identification, and facilitates communication within the project or organization.
Assembly drawings, in particular, benefit from additional features like exploded views and Bill of Materials (BOM) tables. Exploded views visually demonstrate how individual components come together in the final assembly, providing a clear understanding of the assembly process and spatial relationships. BOM tables offer a comprehensive list of assembly components, including part numbers, descriptions, quantities, and relevant data. This invaluable information streamlines procurement, assembly instructions, and inventory management, ensuring efficient and accurate manufacturing processes. Overall, these assembly drawing sheets, enriched with exploded views and BOM tables, play a crucial role in effective communication, meticulous documentation, and optimized assembly processes in technical design and manufacturing realms.
Part #1 - Clamp Block
Part #1 - Clamp Block
Parts are the end goal in drawing with 3D parametric modeling. They are 3D objects that can stand on their own or become part of a larger model made up of many parts called an assembly. The first part that I want to draw is the Clamp Block.
It is a very simple part that can be drawn with one sketch and two extrudes. So lets begin:
1. Start a new sketch and choose the right plane as the sketch plane. Either click on the right face of the view cube or hit the N key to normalize your view so you are looking flat down onto the right plane.
(Note: By drawing this sketch on the right plane we will be able to draw all aspects of the Clamp Block with out having to draw another sketch. If we started on the front plane we would need to draw a separate sketch to include the hole in the middle.)
2. Draw this sketch with these dimensions and then complete the sketch by hitting the green check mark. (I like to draw with the origin point in the middle of my sketch, it helps me orient things easier when everything is centered on the origin.)
3a. Click extrude and on the left you can click on sketch 1. The entire sketch will extrude **OnShape assumes that you do not want to extrude the hole**. Flip the direction of the extrude and put in the value for its thickness.
3b. Click extrude again but this time only select the center rectangle of our sketch **You need to make the sketch visible again by hitting the eyeball next to sketch 1 on the left, OnShape hides the sketch after using it for a feature**. Make sure add is selected at the top so it doesn't make a new part and enter in the value for the thickness.
Good work team, we now have our first completed part model.
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