Stretch/Trim Functions in PDMS Equipment Modelling
One of the important activities of the PDMS designer is to keep the Equipment updated as per the latest revision of the Equipment drawing. There are many instances in which the dimensions of the equipment get revised & the equipment modelled in PDMS has to be updated as per these changes. The model can be updated using the different functions available under the modify tab.
As shown in the above menu there are many options available for the modification of the equipment. Of the many function available we will discuss about the Stretch/Trim function.
Stretch/Trim – enables a primitive to be stretched (lengthened) or trimmed (shortened) by moving one, or more of the primitives P-points. The P-points must be on the ‘end(s)’ of the primitive. The sub-menu contains a variety of stretch/trim options:
All Sides… – displays the Stretch/Trim All Sides form:
The form displays the primitive Type. The CE button makes the CE the subject of the operation and updates the primitive Type if necessary.
Entering a Value in the text box and clicking the Apply button will stretch all external P-points by the entered amount.
Note: A +ve value will stretch the primitive and a –ve value will trim the primitive.
ID P-Point… – displays the Stretch/Trim P-Point form:
The form displays the primitive Type. The CE button makes the CE the subject of the operation and updates the primitive Type if necessary.
Entering a Value in the text box and clicking the Apply button prompts for the identification of a P-point on the primitive. The identified P-point is stretched/trimmed by the entered amount.
Note: A +ve values stretch the primitive, –ve values trim the primitive.
To P-Point – enables a selected P-point on a primitive to be stretched or trimmed to the appropriate co-ordinate of a P-point on another Design element. The User is first prompted to select the P-point to be moved from the CE and, when selected, prompted to select the P-point to stretch/trim to. The first P-point will be stretched/trimmed to the plane of the second P-point.
To Pline – enables a selected P-point on a primitive to be stretched or trimmed to the appropriate co-ordinate of a Pline on a SCTN or GENSEC element. The User is first prompted to select the P-point to be moved from the CE and, when selected, prompted to select the Pline to stretch/trim to. The selected P-point will be stretched/trimmed to the plane of the Pline.
Clearance to P-Point… – displays the Stretch/Trim Clearance to P-Point form:
The form displays the primitive Type. The CE button makes the CE the subject of the operation and updates the primitive Type if necessary.
Entering a Value in the text box and clicking the Apply button first prompts the User to select the P-point to be moved on the CE and, when selected, prompts for the identification of a P-point to stretch/trim to. The first P-point is stretched/trimmed to a plane the specified distance from the second P-point.
Note: A +ve or –ve value determines which side of the target P-point the first P-point will be moved to.
Clearance to Pline – displays the Stretch/Trim Clearance to Pline form. The form displays the primitive Type. The CE button makes the CE the subject of the operation and updates the primitive Type, if necessary.
Entering a Value in the text box and clicking the Apply button first prompts the User to select the P-point to be moved on the CE and, when selected, prompts for the identification of a Pline to stretch/trim to. The P-point is stretched/trimmed to a plane the specified distance from the selected Pline.
Note: A +ve or –ve value determines which side of the target Pline the first P-point will be moved to.
For all of the above options, a confirmation message is displayed. The User can revert the primitive to its original size by clicking Yes, or keep the new primitive size by clicking No.
Note: If two end p-points on the same primitive are selected, the distance between the two points will become zero. These options cannot be used to invert a primitive.
