Creating Pitch Circle Dimensions

DRAW Reference Manual

Dimensioning : Pitch Circle Dimensions : Creating Pitch Circle Dimensions

Creating Pitch Circle Dimensions

The PDIM position is defined by two p-points, p-lines or positions, for example:


NEW PDIM	Create PDIM
PCEN IDP @	Define centre point as p-point position
PCIRC IDP @	Define circumference point as p-point position
NEW PDIM
PCEN POS @	Define centre point as 3D position
PCIRC IDP @

The PCENTRE command defines or redefines the centre point of a PDIM. For example:


PCEN IDP @	Position centre point on p-point - creates an RPPT
PCEN IDPL @	Position centre point on p-line (start) - creates an RPPT
PCEN IDPD @	Position centre point at a distance along a p-line - creates an RPPT
PCEN POS @	Position centre point at a 3D position - creates an RPOI
PCEN POS IDP @	Position centre point on p-point position - creates an RPOI
PCEN POS IDPL @	Position centre point on p-line (start) position - creates an RPOI
PCEN POS IDPD @	Position centre point at a distance along a p-line - creates an RPOI
PCEN @	Position centre point on a p-point (and set DDEG if possible)

If the existing centre point is the wrong database type, then this command will delete it and create a point of the correct type.

The PCIRCUMFERENCE command defines or redefines the Circumference point of a PDIM:
etc (as for PCEN)


PCIRC IDP @	Position circumference point on p-point - creates an RPPT
PCIRC IDPL @	Position circumference point on p-line (start) - creates an RPPT
PCIRC IDPD @	Position circumference point at a distance along a p-line - creates an RPPT
PCIRC POS @	Position circumference point at a 3D position - creates an RPOI

This creates or redefines the circumference point of the PDIM. As with the PCEN command, an RPPT or RPOI element is created as appropriate. If necessary the existing circumference point is deleted. DDEG normally remains unchanged. However, the command:

will change DDEG so that the dimension line passes through the circumference point.

A PDIM may be defined using two cursor hits. These define the Dimension Points and set DDEG for a PDIM but do not set DTRAD.


Example:
NEW PDIM PCEN IDP @ PCIRC @

Individual RPPT Dimension Points may be redefined using the ON command. Individual RPOI Dimension Points may be modified by the POS command. If a RULE is required to parameterise the 3D position, then this must be set or deleted explicitly at the RPOI.

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