can you choose what memebers to constrain to inventor

Inventor Tutorial #2: Assemblies and Labeling Parts

This week, we will review how to utilize individual parts to create an assembly. The process itself is not very difficult, but if it is not washed properly, it can cause quite a headache. Since we volition later utilise the blitheness option within Inventor itself, it is especially important that students are comfortable with assemblies.

Hither are the main points you should probably note:

To open up an assembly, open up a "Standard.iam" file

In the "Assembly Panel", choose "Identify Component" and observe your role click to place one

It is generally good to "Footing" your principal component (the one where nigh of your constraints will be fabricated)

Yous can "Ground" an object by right clicking on the part and selecting the grounded selection

If yous await at the role on the "Model Toolbar", yous volition run across a pushpin next to this object

A "Grounded" object will not move – constrained objects will move with respect to this one

Information technology is recommended to place components and constrain them one at a time

In that location are three general categories of constraints – we are just really concerned with:

Assembly – basic constraint used to constrain objects to proper orientation with respect to one another past using surfaces, edges, planes, points and axes.

Motility – used for components such as meshing gears or rack and pinions

Inside the Associates constraints tab, in that location are 4 types of constraints:

Mate

ƒUsed to orient chosen FLAT faces of objects in desired manner

Note: to fully constrain an object and then that information technology doesn't motion using the mate selection, you will have to constrain it 3 times

1 constraint each for the x, y, and z planes

Meet BELOW "Constraint Tips" for an instance of using the mate selection

Bending

Used to specify the bending human relationship between two planes/surfaces

Similar to the mate option, except your offsets are at present in angle degrees

SEE BELOW "Constraint Tips" (towards the end of the tutorial)

Tangent

ƒUsed to orient Circular face with Flat or Round face

Insert

ƒUsed to insert a Round object into another Circular object

Offsets are used to specify the altitude or angle betwixt the two surfaces you are constraining

For Mate, Tangent, and Insert

The commencement will motion the objects so that they are the specified distance autonomously (default unit of measurement in inches)

Note: you tin input a negative offset to move the object in the opposite management

For Angle

The offset will angle your objects so that their planes are the specified degrees apart from each other

Check for problematic constraints by going to modeling toolbar and changing from "Assembly view" to "Modeling view" and look for it under the relationships folder

It is easiest to just cheque the constraints and you can by and large see what the consequence is

If not, right click and use Inventor help

The motility constraints are slightly more complicated – there are two options:

2 round objects – gears and pulley systems

Different arroyo with circles and gears:

With circles, y'all select the contact surface of the objects and the ratio is automatically calculated using the diameters

With gears, you lot select the hole of the gear and then enter the ratio of teeth

A round and a flat object – rack and pinion systems

Select the edge of the round object to highlight the rotational axis

Select the REAR EDGE of the flat object

ƒEnter the distance that the linear object moves for each round object revolution (circumference!)

Fantabulous resource to explain this: http://united states.autodesk.com/adsk/servlet/item?siteID=123112&id=3028036

Multiple assemblies can be combined to grade a more complete assembly

Once an assembly is consummate, it tin then be inserted onto a cartoon file

Use "Drawing Notation Panel" to add balloons and parts listing – line up balloons!

Constraint Tips (using the Mate and Bending Constraints)

Constraining your parts can make all the difference when yous are preparing for your presentation and construction your animations. Because of the difficulty in doing these constraints, here are a few tips and solutions to problems you lot may face up

When doing constraints, you ofttimes need to consider each dimension that is a cistron, i.e./ you will often need 3 constraints to embrace your x-y-z axis.

So with that out of the way, lets look at some role configurations and decide how to constrain them:

Offset by opening upward the constraint window in Inventor. Observe the Part constraint window appears. On it are the constraint types, the directionality of the constraints, and the value of deviation of that constraint type.

1. Putting the peg/axle in the hole

a. Then we start with our parts. As you can encounter, there is a rod and a hole. Lets put the rod in the pigsty.

i. To get-go, lets select our constraint window. And then we volition select our constraint type (MATE equally always).

2. Now lets select the geometry of the part were going to mate. Because we desire to mate the axis or middle of this cylinder with the axis of the box, motion the curser over the part until the dashed line appears.

iii. Next, lets select the hole where we are putting the part.

1. Note, if the curser is not in the correct place, yous will be mating to the border of the hole. If the holes are of unequal size, this can create bug

2. Equally before, movement the curser to the inside of the pigsty until the dashed line appears. Press enter to confirm the constraint.

b. So the rod is constrained inside the rod but as you tin run across it nonetheless slides in and out, and then lets put on the adjacent constraint. Decision-making the depth of the rod in the hole.

i. To first, lets select our constraint window. And so nosotros will select our constraint type (MATE equally always).

ii. Now lets select the faces that we will exist constraining. Because of the nature of this constraint, there are several options available

1. The more robust choice is to apply the top surfaces of the rod and the hole or parallel flat plain (i.e. the box top). Also note that you can alter the directions of the selected faces, likewise equally control the separation between the 2 plains.

2. The limited option is to mate the border of the rod with the edge of the hole. Again this tin can create issues if the holes are of unequal size.

c. Congratulations, the part is sufficiently mated

two. Putting the apartment part on the other flat part.

a. And then as mentioned before, a fully constrained object is bound in 3 dimensions. So lets outset by constraining the cube to the board of the plank.

i. Every bit before, lets open up the constraint window and select mate.

ii. Oftentimes, you lot will need to pan or rotate your view to see the surface of interest. Lets turn the part to select the bottom of the cube.

three. Rotating the view, we can encounter the elevation of the lath we wish to constrain to. By having a 0 commencement, the cube will now be bound to the acme surface of the lath. Moving like a computer mouse on a desk-bound, the cube tin notwithstanding move forward/back and side to side, but it can no longer move upward off the board (Z-axis).

b. Side by side, lets put the 2d bound on the cube so that is cannot motion in the Y-centrality.

i. As before, enter the constraint window, select constraint and select the surfaces of interest.

two. This time, notation that the directionality has been undated. This becomes of import with more circuitous geometries.

c. With the constraint approved, you tin can run into that the block is constrained in 2 of 3 directions and can only motion in the x direction. Applying the concluding constraint fully bonds the object.

i. Repeating the same procedure every bit earlier.

3. Having the rotating tank caput

a. Quite often, y'all will have 1 part rotating in relation to some other. Weather information technology is a gear or an axle, having constraints easy to manipulate will ensure that when it comes fourth dimension to breathing things are easy to work.

b. Before nosotros start, because of the requirements of blitheness, some pre-processing may be required

i. First, the point of rotation should exist defined. Because the cube will exist rotating about that fundamental axis, lets set up the function.

ane. Observe that the origin of the part is not along the point of rotation. Moving the sketch to move the origins location on the surface.

2. Repeating this on all directions, we tin control the position of the origin. As you can meet, the origin is now set along the centrality of rotation, every bit well as it is set up to the elevation of the cube for easy access.

ii. Now notation that there is no axis or rod set on the flat board. Considering we want the block to rotate, an like shooting fish in a barrel style to do this is to artificially put a cylinder for rotation.

ane. Extruding the region creates an axis that we can rotate virtually. To go on things looking prissy, the extrusion tin can be on such small calibration that it is nearly invisible, 0.01in. I have highlighted the regions so that you may find them.

c. So lets make out assemble

i. Repeat the normal constraint steps. Lock the hole to the cylinder;

lock the cube face to the board face.

ii. For the final footstep, we will use the bending constraint. Much like the mate constraint we select the faces of interest and gear up some displacement value. However, unlike mate where the displacement is a altitude, here the displacement is an angle. This will be very helpful when information technology comes to animation equally we can comment the angle to change, this rotating the part.