Week 7 Challenge - Assembly Workbench

AIM

To create assemblies based on the given model drawings.

REPORT

1. Quick return motion mechanism

• Based on the drawings given before creating an assembly, we need to create the parts seperately
• So first we open a new part file and start creating the different parts seperately in different part files.

1. Body 1

• Then after creating the parts we create a new product file.
• We then load all the parts into the new product file using 'existing component option'
• After that we select body 1 and fix it using the fix constraint
• Then we take coincide constraint to coincide body 1 and body2 along the axis.
• Then again we apply coincide contraint to the faces of body 1 and body 2.
• Similarly all the bodies are coincided using coincidence constraint to create the assembly of quick return mechanism.
• We use the explode option finally to check weather if everything is constrained properly

Offset Constraint

The Offset Constraint is used to place selected elements at an offset distance from
each other. It also makes the two planar faces parallel to each other. To invoke this
tool, choose the Offset Constraint button from the Constraints toolbar. After invoking
the tool, you are prompted to select the first geometric element for the Offset constraint.
Select a planar face, circular face, plane, axis, or a point from the geometry area. You are
prompted to select the second geometric element. Select a planar face of another component;
the Constraint Properties dialog box is displayed

. C V Joint

• Based on the drawings given before creating an assembly, we need to create the parts seperately
• So first we open a new part file and start creating the different parts seperately in different part files.

1. Body

After placing the components in the product file, you need to assemble them. By assembling the components, you will constrain the degree of freedom of the components. As mentioned earlier, the components are assembled using the constraints. Constraints help you to precisely place and position the components with respect to the other components and the surroundings in the assembly. If all degrees of freedom of all components of the assembly are restricted, it is called a fully constrained assembly. Else it is called a partially constrained assembly. If some mechanism needs to be created after assembling the components, some degrees of freedom of the assembly needs to be kept free intentionally, so that movements can be achieved in that direction. Various types of constraints available in CATIA are discussed below

Contact Constraint :

The Contact Constraint is applied to make a surface to surface contact between two selected elements from two different components. The elements to be selected can be planes, planar faces, cylindrical faces, spherical faces, conic faces, or circular edges. To invoke this tool, choose the Contact Constraint button from the Constraints toolbar.you are prompted to select the first geometric element of the Contact constraint. Select the element from the first component. Next, you are prompted to select the geometric element to place in contact with the first selection. Select the element from the second component. A Contact constraint will be applied between the two elements and the component will be placed with respect to the constraints after updating. The Contact constraint symbol will be displayed on the assembled components.

Fix Together :

The Fix Together constraint is used to fix the position of the selected components with respect to each other. Once the selected components are fixed together, they can be moved as a single component such that the position of one component with respect to another component remains the same. To invoke this tool, choose the Fix Together button from the Constraints toolbar; the Fix Together dialog box is displayed. Now, select components to be linked. The part number of the selected components are displayed in the Fix Together dialog box.If you want to remove a particular component from the list, click on its part number in the Components selection area. Choose the OK button from the Fix Together dialog box to apply the Fix Together constraint.