Creating Pitch Circle Dimensions
- Last UpdatedDec 08, 2025
- 2 minute read
The PDIM position is defined by two p-points, p-lines or positions, for example:
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NEW PDIM |
Create PDIM |
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PCEN IDP @ |
Define center point as p-point position |
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PCIRC IDP @ |
Define circumference point as p-point position |
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NEW PDIM |
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PCEN POS @ |
Define center point as 3D position |
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PCIRC IDP @ |
The PCENTRE command defines or redefines the center point of a PDIM. For example:
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PCEN IDP @ |
Position center point on p-point - creates an RPPT |
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PCEN IDPL @ |
Position center point on p-line (start) - creates an RPPT |
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PCEN IDPD @ |
Position center point at a distance along a p-line - creates an RPPT |
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PCEN POS @ |
Position center point at a 3D position - creates an RPOI |
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PCEN POS IDP @ |
Position center point on p-point position - creates an RPOI |
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PCEN POS IDPL @ |
Position center point on p-line (start) position - creates an RPOI |
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PCEN POS IDPD @ |
Position center point at a distance along a p-line - creates an RPOI |
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PCEN @ |
Position center point on a p-point (and set DDEG if possible) |
If the existing center 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)
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PCIRC IDP @ |
Position circumference point on p-point - creates an RPPT |
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PCIRC IDPL @ |
Position circumference point on p-line (start) - creates an RPPT |
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PCIRC IDPD @ |
Position circumference point at a distance along a p-line - creates an RPPT |
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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:
DDEG TRUE
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.
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Example: |
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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 parameterize the 3D position, then this must be set or deleted explicitly at the RPOI.