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This task shows you how to create the thread
dimensions. |
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Open the
thread.CATDrawing document. |
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Click Thread Dimension
in the Dimensioning toolbar (Dimensions
sub-toolbar).
The Tools Palette is displayed, to let you select the
dimension representation.
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Select the thread to be dimensioned in the front
view.
In this case click on the thread diameter, and
the dimension is created.
Depending on whether the thread has been automatically
or manually created and/or standard has been specified in your 3D
document, you will have following cases:
Automatically created 3D Thread without
a standard |
Automatically created 3D Thread
with a
standard |
Created 2D Thread with
no association to 3D Thread |
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Right-click the dimension and select Dimension1.object > Dimension
Representation > Force Horizontal Dimension in View,
the dimension appears as:

(or Force Vertical Dimension in View).

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Click Thread Dimension
again.
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In the section view B-B, select one of the two lines
representing the thread to be dimensioned.
Two thread dimensions appear, representing the thread
diameter as well as the thread depth.
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The dimensions are created as feature
dimensions. If the Activate analysis display mode check box
is selected in the Tools > Options > Mechanical Design > Drafting >
Dimension tab, Analysis Display Mode area, these dimensions are displayed using
the color defined for Technological feature dimensions
in the Types and colors dialog box (click the Types and
colors... button in the Analysis Display Mode area).
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In the top view, you can modify the orientation of threads dimensions.
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If the thread diameter dimension is created from a 3D thread
and this 3D thread has a standard, the value of the dimension is the
description of this 3D thread and the prefix of the dimension cannot be
defined.
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If the thread diameter dimension is created from a 3D thread
and this 3D thread has a no standard, the value of the dimension is the 3D
thread diameter value and a diameter symbol is set as a prefix on
the dimension. In this case, this prefix can be edited.
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If the 3D thread has a standard description, the value of the
associated thread diameter dimension is always the Thread
Description (Hole Definition dialog box, Thread
Definition field) as of the 3D thread. The dimension value cannot
display the diameter of the 3D thread in the side view as well as in the top view (except if
you add a fake value).
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Thread dimensions created on top views are technological
features, so they cannot be re-routed.
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Thread dimension on top view remains associative to 3D
thread even though 2D thread is deleted.
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Be aware that clearing the Thread check box in the
Properties dialog box (available via Edit > Properties)
of the view will make the thread dimension lose its associativity. It will appear
as being not up-to-date using the color defined for Not up-to-date
dimensions in the Types and colors dialog box).
Subsequently re-selecting the Thread option from the
Properties dialog box will not make the thread dimension associative
again and it will still appear as being not up-to-date. You will need to
re-create the dimension. |
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Thread dimensions based on top views
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Thread dimension properties based on top views can
be created either automatically or manually depending on
whether a thread dimension and/or a standard have been
specified in your 3D document. Refer to Creating
Threaded Holes to know more about specifying
threads in 3D holes.
The following table summarizes information about
thread dimensions computing based on top views:
No
thread in the 3D
document |
A Standard Thread
type has been defined in
3D document - The thread
dimension is
created interactively
from a 2D thread, which
does not point to a 3D
thread. |
Dimension creation |
- The
dimension value
is set according
to the diameter
of the 2D
thread.
- The
key M
is set as a
prefix on the
dimension.
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Dimension update
behavior |
- Only
the dimension
value is
updated.
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Modification of
dimension properties |
- All
dimension
modifications
are kept.
- The
M prefix can
be removed or
replaced by any
other prefix.
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Standard Thread type
defined in 3D document |
A Standard Thread type
has been defined in 3D
document - The Thread
option is selected so a
2D thread is
automatically generated
or is created from
a 2D thread, which points
a 3D thread. |
Dimension creation |
- The
dimension value
is the
description of
the 3D thread. .
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Dimension update
behavior |
- If
the 3D standard
is
changed, this
change is taken
into account
when updating
the dimension.
- If
the 3D standard
is removed, the
value of the
dimension is the
thread diameter
and a diameter
prefix is added.
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Modification of
dimension properties |
- All
dimension
modifications
are kept when
the 3D
dimensions are
updated.
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Standard Thread type not
defined in 3D document |
A Standard Thread
type has not been
defined in 3D document -
The Thread option is
selected so a 2D thread
is automatically
generated or is
created from a 2D thread,
which points a 3D thread. |
Dimension creation |
- The
dimension value
is set according
to 3D diameter.
- The
diameter symbol
is set as a
prefix on the
dimension.
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Dimension update
behavior |
- Only the
dimension value
is updated.
- If a
3D standard is
added to the 3D
thread, the
value of the
dimension is the
thread
description.
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Modification of
dimension properties |
- All
dimension
modifications
are kept when
updating the
dimension.
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If the Thread option is not selected in 3D, a 2D thread
can be added manually. The thread dimension is not
directly linked to 3D. |
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Thread dimensions based on side views
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Thread dimension properties based on side views can be
created either automatically or manually depending on
whether a thread dimension and/or a standard have been
specified in your 3D document. Refer to Creating
Threaded Holes to know more about specifying threads
in 3D holes.
The following table summarizes information about thread
diameter dimensions computing based on side views:
No
thread in the 3D
document |
A Standard Thread
type has been defined in
3D document - The thread
dimension is
created interactively
from a 2D thread, which
does not point a 3D
thread. |
Dimension creation |
- The
dimension value
is set according
to distance
between the
lines.
- The
key M
is set as a
prefix on the
dimension
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Dimension update
behavior |
- Only
the dimension
value is
updated.
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Modification of
dimension properties |
- All
dimension
modifications
are kept.
- The
M prefix can
be removed or
replaced by an
other.
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Standard Thread type
defined in 3D document |
A Standard Thread type
has been defined in 3D
document - The Thread
option is checked so a
2D thread is
automatically generated
or is created from
a 2D thread which points
a 3D thread |
Dimension creation |
- The
dimension value
is the
description of
the 3D thread. .
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Dimension update
behavior |
- If
the 3D standard
is
changed, this
change is taken
into account
when updating
the dimension.
- If
the 3D standard
is removed, the
value of the
dimension is the
thread diameter
and a diameter
prefix is added.
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Modification of
dimension properties |
- All
dimension
modifications
are kept when
the 3D
dimensions are
updated.
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Standard Thread type Not
defined in 3D document |
A Standard Thread
type has not been
defined in 3D document -
The Thread option is
checked so a 2D thread
is automatically
generated or is
created from a 2D thread
which points a 3D thread |
Dimension creation |
- The
dimension value
is set according
to 3D diameter.
- The
diameter symbol
is set as a
prefix on the
dimension.
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Dimension update
behavior |
- Only the
dimension value
is updated.
- If a
3D standard is
added to the 3D
thread, the
value of the
dimension is the
thread
description.
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Modification of
dimension properties |
- All
dimension
modifications
are kept when
updating the
dimension.
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- In pre-R18 documents, during the creation of thread
dimensions, NO_DESC_IN_DRAFTING AND
DESC_IN_DRAFTING keys defined in 3D standards determined the dimension
type created.
- There is no change in the behavior when updating pre-R18 thread
dimensions.
- Thread depth dimensions behave as diameter dimensions.
However, they have no prefix and their value is the thread depth
value defined in 3D.
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Threaded hole dimensions behavior with Standard specified
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When the standard is specified:
Top View behavior |
Side View behavior |
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Threaded hole dimensions behavior with No Standard specified
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When no standard is specified:
Top View behavior |
Side View behavior |
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