Syntax 7

<syntax_7>::= <plane_def>

     ,MSID=<side_info>

      [,SID=<side_info>]

      [,SI2=<side_info>]

      [,A=<length_A>]

      [,B=<length_B>]

      [,K=<depth>]

      [,C=<length_C>]

      [,D=<length_D>]

      [,R=<radius>]

      [,<position_a>]

      /<position_b>

      [/<position_c>]

      ;

<plane_def>

defines the plane of the bracket. This information is compulsory except when the bracket arm A falls along a shell curve. In that case the bracket plane is supposed to be the same as that of the curve if not otherwise specified.

<plane_def>:= <principal_plane> |

<normal+line> |

<three_points>

<principal_plane>::=X|Y|Z=<coord> (1...25)

<normal+line>::=<line>

In this case the bracket is supposed to be perpendicular to the uv-plane of the current panel along a given line in that plane.

<three points>::= ORI=<coord>,<coord>,<coord>

,UAX=<coord>,<coord>,<coord>

,VAX=<coord>,<coord>,<coord>

When the bracket is defined by this option arbitrary space points in the plane of the bracket can be selected, provided they are not co-linear.

When the bracket is defined by a curve or by three points only one bracket can be generated in one statement, otherwise up to 25.

Examples of plane definitions:

1. X=FR25()29, FR31()35

2. U=FR34, V=1345, T=45

3. X=FR34, Y=1345, XT=FR34+100, YT=1445

4. ORI=FR34,1345,1000, UAX=FR34+100,1445,1000, VAX=FR34,1345,2000

Examples 2), 3) and 4) are supposed to define the same plane. 2) and 4) suppose that the bracket is perpendicular to the current panel.

MSID

Defines the orientation of the material relative to the mold plan of the bracket.

SID

Defines the position of the bracket relative to the element given in <position_a> unless defined by any of the involved elements.

SI2

Defines the position of the bracket relative to the element given in <position_b> unless defined by any of the involved elements. Need never be given if <position_c> is given.

A

Defines the length of the bracket arm A it not otherwise specified. If given (=a) and a<10, A will be set to a*B (where B is the length of arm B, whether explicitly given or calculated).

B

Ditto bracket arm B. If given (=b) and b<10, B will be set to b*A (where A is the length of arm A, whether explicitly given or calculated).

If A and/or B is negative, this should be interpreted as the height of the corresponding toe above the bottom of the bracket (‘perpendicular arm length’).

C

Defines the height of the toe at the end of arm A. In case of connection to profile this height is normally set automatically.

K

See Syntax 2.

D

The same for toe at end of arm B.

R

In certain cases a major (fillet) radius of the free side of the bracket (associated with one of the toes) may be controlled by the user via R. In most cases this radius has a default value set up in the bracket definition.

The bracket position is defined in the following way:

5. The origin of the bracket is supposed to be in the intersection between the element given by <position_a> and <position_b>.

6. The position of bracket arm B is defined by <position_b> and follows always after the first slash.

7. For brackets with two arms the bracket arm A is defined by <position_a>. For brackets with three edges the arm A is defined by <position_c>.

8. For brackets with three edges the position of the edge connecting arm A and arm B is defined by <position_a>.

Examples:

Positioning of bracket with two arms:

Positioning of bracket with three arms:

<position_a>::=

<position_a>

is used to define the position of arm A for brackets with two arms, to define the position of the connection edge for brackets with three edges (see above).

When the panel to be given is the current panel the panel name need not be given.

<position_b>

has the same layout as <position_a> and is used to define the position of bracket arm B.

If bracket arm B has a toe with tight profile connection a profile reference must be included. The complete arm B may fall along a profile section, for example, a flange in the current panel. In the latter case no panel name is required.

<position_c>

is similar to <position_b>. It is used to define the position of bracket arm A for brackets with three edges but may also be used to define the connection /restriction of the bracket arm A for two-arm brackets (see above).

In case arm A of a two-arm bracket should be restricted by a profile section there are two possibilities provided arm A is located along a plane panel. Either the profile reference can be given in <position_a> or in <position_c> (see the example below). (If arm A is located along a shell curve and restricted by a shell profile section the latter option is the only alternative).

Bracket connection with optional alternatives for generation (see below):

Alternative 1:

BRA, ..., 'PAN_A', SL13/ 'PAN_B', ... ;

Alternative 2:

BRA, ..., 'PAN_A'/ 'PAN_B'/ 'PAN_A', SL13, ... ;

(If PAN_A should happen to be the current panel, 'PAN_A' can be left out completely in the statements above).

In the examples below, PAN_A is supposed to be the current panel and thus left out wherever possible.