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Cimatron
Cimatron Arc Planes
The circular motion block does not explicitly state the arc axis vector (orientation). It is implied by the arc plane, as represented in system variable ARC_PLN.
GPP2 receives the arc plane information from the Cimatron toolpath expressed in the procedure UCS. GPP2 translates it to the REF UCS. GPP2 assumes that the planes defined in Cimatron are the normal planes (coming from above) and not the reverse planes. Therefore, the toolpath arc plane is interpreted as follows:
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Toolpath Arc Plane |
Plane |
Arc Axis (in Proc UCS) |
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ARC_PLN = 1 |
X-Y plane |
Z axis (0,0,1) |
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ARC_PLN = 2 |
Z-X plane |
Y axis (0,1,0) |
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ARC_PLN = 3 |
Y-Z plane |
Z axis (1,0,0) |
The arc axis is rotated to convert it to the REF UCS, and a new ARC_PLN value is calculated and presented to the EX2 program. The same values are used.
In the EX2 program, the same values are used for both the major plane and the reverse plane. Only the arc direction is reversed.
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