4. MATERIALES Y METODOS
4.3 EVALUACION CON MARCADORES
Delete all of your dimensions. You are now going to create all the necessary dimensions
General dimension
The dimensions icon can be used to create all four of the preceding dimensions without having to switch icons. CATIA will automatically determine what type of dimension you want to create based upon the elements that you select. You have the option of overriding its choice using the third mouse button. All the options that were discussed earlier are still available if you use the third mouse button.
Select the dimensions icon. It is located under the diameter dimensions icon. It is very similar to the length/distance dimension icon. This one will allow you to create a variety of dimensions.
In the Top view select the top left horizontal line and the horizontal line that is below it. Refer to the diagram below if you need help.
Specify the location of the dimension as shown below.
Double select the dimensions icon. You can double select the icon and it will stay active
until you select the icon again.
In the Top view select the top left horizontal line and locate the dimension up and to the right of the horizontal line.
In the Top view select the large partial circle. It should show a radius dimension. Press the third mouse button. You have the option of specifying a radius or a diameter.
Select the Radius Center option and locate the dimension down and to the right. In the Top view select the full circle. You want this dimension to be a diameter. Press the third mouse button and select the Diameter Center option then locate the dimension down and to the left. You are finished with the Top view. It should appear
In the Right view select the leftmost vertical line. Make sure that it appears as a length
and not as a diameter dimension. It may appear as a diameter because it knows that the line represents a curved surface and it defaults to Diameter Cylinder.
Press the third mouse button and be sure that Length is selected. This will switch the
dimension to a length.
Locate the dimension to the left of the line.
Select the leftmost and the rightmost vertical line and locate the dimension above the part.
Select the rightmost vertical line and locate the dimension to the right of the line. Select the angled line and the top horizontal line and locate the angle dimension above the horizontal line. That finishes your Right view. It should look similar to the diagram
shown below.
Dimensions with Intersection points
You have an option to create your dimensions from intersection points of existing geometry. This option is extremely useful to create a dimension from a theoretical sharp corner of a rounded corner.
Open theDimensions with int points drawing. Select the dimensions icon.
Press the third mouse button and select Intersection point detection. If the option is
already selected then you do not need to select it. You can also select this option from the
Tools Palette. This will allow you to create a dimension from an intersection point of the
existing geometry.
In the Right view select the intersection point as shown below.
Select the line and position the dimension as shown below.
Chamfer
The chamfer dimension is used to dimension chamfers. You have to select the chamfer and then specify the two reference surfaces. These are the surfaces that were trimmed when creating the chamfer. You can select the lines touching the endpoints of the chamfer to define the reference surfaces.
Open theDimensions drawing. You will now investigate some of the other dimension
options.
Select the chamfer dimensions icon. It is located under the dimensions icon. You are going to dimension the chamfer. Some chamfer options appear in the Tools Palette. You may also press the third mouse button to get these options.
Length x Length Length x Angle Angle x Length
Length
You can choose whether you want to measure Length x Length, Length x Angle, Angle x
Length or Length with the chamfer dimension. You can also specify whether it should use
one symbol or two symbols. Examples are shown above. These options can be modified later using the Properties option.
In the Top view select the chamfer on the right. The chamfer dimension appears. This
will occur only if you have the Detect chamfer option turned on in the Tools, Options. If it is not then you must define reference surfaces.
If you want the distance to be measured from a particular side you can either select elements to define the appropriate reference surfaces or you can make sure that you select the chamfer appropriately. The two options shown below appear depending on where you are selecting the chamfer. Once again, these will only appear if you have the Detect chamfer option on.
1 Shows the element that will be dimensioned 2 Shows the first reference element
3 Shows the second reference element
Thread
This will allow you to create thread dimensions on your drawing. You can create the dimension on the top view of the thread as well as the side view of the thread.
Select the thread dimension icon. It is located under the dimensions or chamfer dimensions icon. You are going to put a thread dimension in the Top view.
In the Top view select the thread definition that surround the center hole. This icon
will only allow you to select a thread definition so you do not have to worry about selecting the wrong element. The thread dimension appears similar to the diagram shown below.
Select the thread dimension icon again. This time you are going to select a line that
represents the thread in the Front view.
In the Front view select the right line representing the thread. Once again it will only
allow you to select thread definition elements so you do not have to be too careful. The thread dimensions appear similar to the diagram shown below.
Coordinate
A coordinate dimension is used to display the coordinates of a point location.
Change the properties of the Top view to show 3D points. This will show the points that
were created in the part.
Select the coordinate dimensions icon. It is located under the dimensions or thread dimension icon. Two new icons appear in the Tools Palette. One allows you get the 2D coordinates and the other allows you to get the 3D coordinates. If you create a 2D point you will only be able to get the 2D coordinates for obvious reasons. These options are also available by pressing the third mouse button.
2D coordinates 3D coordinates
Select the 3D coordinate icon in the Tools Palette. This will allow you to get the 3D
coordinates for a point.
In the Top view select the center point of the middle circle. You can now position the
dimension.
Locate the dimension down and to the left of the part. It should appear similar to the
diagram shown below.
The 2D coordinate option is used in the same manner as the 3D option except it will only give the two coordinates.
Hole dimension table
You can generate a hole dimension table and position it within a view. You must select all the holes that you want to include before selecting the icon.
In the Top view select all eleven holes. You can do this by holding down theCtrlkey while selecting.
Select the hole dimension table icon. It is located under the dimensions or coordinate dimensions icon. An Axis System and Table Parameters window appears.
Origin Reference Uses the view origin but you can specify new reference by keying in a value for X and Y or by selecting an element. You can also change the Angle and Flip the directions horizontally or vertically. There is also a toggle to Create Representation of the origin reference or not.
Title Defines the title for the table
Columns Defines the labels that will be used on the holes and in the table. You can use letters, numbers or leave them unlabeled. The ... to the right allows you to specify a starting letter or number for the labeling. Also you can specify whether or not you want the X, Y and Diameter values.
Titles Defines the titles for each column
Table format You can Transpose, Sort or Split
Transpose Transposes the rows and columns
Sort Table Content You can specify which column you want to sort by first, then second and then third. It can either be Ascending or
Descending.
Split Table
Split Criteria Specifies the Max. number of rows or the Max. height before the table is split
Table Position Specifies if the tables are aligned Vertical or
Horizontal after splitting
Options Specifies the Distance between the tables after splitting and whether you want to Duplicate the first
row for each table
Change the Angle to 90 degrees and Flip it vertically. This will change the axis so that
the Y axis points to the left and the X axis point down.
Choose the Label: A, B, C, ... option under Columns. Key Hole Table for the Title.
Turn on the Split Table option and select the ... next to it. The Table Split window
appears.
Turn on the Max. number of rows and key in 7 under Split Criteria, turn on Vertical under Table Position and turn off Duplicate first row under Options and select OK.
You are now ready to create and position your table.
Select OK. Letters appear by each hole labeling them. You need to specify the location for
the table.
Select above the part near the top of the sheet as shown below. The hole dimension
Coordinate dimension table
You can also generate a coordinate dimension table and position it within a view. You should select all the points that you want to include before selecting the icon.
Select all of the geometry in the Top view. You can do this by using the mouse and
dragging a box around the geometry for selection.
Select the coordinate dimension table icon. It is located under the dimensions or hole dimension table icon. An Axis System and Table Parameters window appears. The options are almost identical to the hole dimension table, therefore they will not be discussed here.
You have the option of using a 3D axis system or the 2D reference axis system. If you use the 2D reference axis system then it works the same as the hole dimension table. You can either use the absolute axis system or one that you created in the 3D part.
Change the Axis system to be 3D absolute axis system. This will use that axis to generate
the table.
Key Coordinate Table for the Title and choose the Index: 1, 2, 3, ... option under
Columns, make sure the Split Table option is off.
Position the table to the left of the Hole Table. It should appear similar to the diagram
shown below.
Next you are going to create a string of dimensions using two different methods, cumulated and stacked.
Chained
The chained dimensions icon allows you to specify an element and then you can continue to select other elements and it will create a chain of dimensions with each one based off the second element of the previous one.
Select the chained dimensions icon. It is located under the dimensions or coordinate dimension table icon. This will allow you to specify an element and then specify a second element. Then every selection after that will be based from the previous selection, creating a string of dimensions.
Turn off the Intersection point detection option.
In the Front view select the leftmost vertical line. You can now continue to select other
elements. The dimensions will not actually be created until you select off an element.
Select the five axis lines one after the other. The dimensions should start appearing.
Make sure you select the axis lines and not the hidden lines.
Select off an element. The dimensions are created. It should appear similar to the diagram
shown below. You may have to move the view label down in order to see the dimensions.
Select on the .50 dimension and drag it down. Notice that all of the dimensions move
with it. This is because you create a dimension system and you are in dimension system selection mode. If you wanted to change the properties of the dimensions, you could go to properties and all of the dimensions would change at the same time.
Turn off the dimension system selection mode icon. This will allow you select each dimension separately.
Select on the .50 dimension. Notice just that dimension highlights this time. You are now
going to undo those dimensions and you are going to create them using the cumulated dimensions icon.
Cumulated
The cumulated dimensions icon allows you to specify an element and then you can continue to select other elements and it will create a string of dimensions all based off the first element.
Select the cumulated dimensions icon. It is located under the dimensions or chained dimensions icon. This will allow you to specify an element that will be used as a base and then continue to select additional elements as it creates a string of dimensions.
In the Front view select the leftmost vertical line. You can now continue to select other
elements and it will generate dimensions based off this first element. They will not actually be created until you select off an element.
Select the five axis lines one after the other. The dimensions should start appearing.
Make sure you select the axis lines and not the hidden lines.
Select off an element. The dimensions are created. It should appear similar to the diagram
shown below. You may have to move the view label down in order to see the dimensions.
You are now going to undo those dimensions and you are going to create them using the stacked dimensions icon.
Stacked
The stacked dimensions icon allows you to specify an element and then you can continue to select other elements and it will create a stack of dimensions all based off the first element. This is different from the cumulated style because this will create both extension lines for each dimension and they will stack outwards instead of being all in one line.
Select the stacked dimensions icon. It is located under the dimensions or cumulated dimensions icon.
In the Front view select the leftmost vertical line. You can now continue to select other
elements and it will generate dimensions based off this first element. They will not actually be created until you select off an element.
Select the five axis lines one after the other. The dimensions should start appearing.
Make sure you select the axis lines and not the hidden lines.
Select off an element underneath the part. The dimensions are created. It should appear
similar to the diagram shown below. You may have to move the view label down in order to see the dimensions.
Notice that the stacked dimensions are spaced apart from one another and they all have both extension lines.
Fillet Radius Dimensions
There are times when you create a view from a part that has a fillet but the view cuts the fillet such that the curve is not a true circle so you cannot get the correct fillet radius value. There is an option to get the actual fillet radius.
Open theFillet Radius Dimensions drawing. It contains a single view. Select the dimensions icon and select the curve as shown below.
Change the precision to four decimal places. Notice that the value changes as you move
the dimension along the curve.
Press the third mouse button while on the dimension. Options appear.
Select the Fillet Radius option. Notice that the value stays at .125 no matter where you are
along the curve. This is the radius of the fillet.
Dimensions for curves
There are some options for dimensioning curves that can be done with the dimension icon.
Open theDimensions for curves drawing. You will use this drawing to explore some
of the options for dimensioning curves.
Select the dimensions icon and select the curve on the right. A length dimension
appears.
Press the third mouse button. As you can see you get the same options as if you were
dimensioning a length. You may also dimension the length of the curve or a partial length of the curve.
Select Radius Center. This will allow you to move your mouse along the curve and select
Move your mouse and create a dimension in about the same place as shown below.
Your radius value may differ since the radius changes all along the curve.
Select the dimensions icon again and select the top horizontal line and the curve. A
dimension appears.
Select the force horizontal dimension in view icon in the Tools Palette. This will measure the curve between its highest and lowest point. This option can also be found by pressing the third mouse button and looking under Dimension Representation.
Select the dimensions icon again.
Select the force vertical dimension in view icon in the Tools Palette. You can also choose this option by pressing the third mouse button.
Select the curve at the location shown below and the bottom horizontal line. You
should be able to slide the yellow box to other point locations along the spline. You should also be able to change the Extension Lines Anchor using the third mouse button.
Position the dimension as shown above. You can also dimension the curvilinear length of
the curve.
Select the dimensions icon again and select the projected dimension icon. You can also choose this option by pressing the third mouse button.
Press the third mouse button and choose Curvilinear Length if not already selected.