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With the Allegro PCB Editor SPB16.5 release we've enhanced the existing Allegro drafting dimensioning capabilities, so that when a dimension is created involving one or more design database objects the dimension will subsequently remain internally ‘associated’ with those objects as well. Subsequent editing operations such as the moving of an object can then appropriately and automatically update as required any dimensions that are associated with that object.
Read on for more details …
There's a great movie showing all the details that you can find on Cadence Online Support HERE !
The Allegro PCB Editor dimension environment is entered by selecting Manufacturing — Dimension Environment. While in the dimension environment you have access to the following commands which are available in the RMB pulldown.
Parameters Invokes the Global parameters form Show dimensions Displays information on the dimension including if it is an associated dimension.Align dimensions Aligns dimension text. Select the master and then window select remaining text to align with the master. Lock dimensions Locks the location of the dimension text.Unlock dimensions Unlocks the location of the dimension text.Z-Move dimensions Allows you to move the dimension to an alternate Class/Subclass combination. Allowable class/subclasses Board Geometry/Dimension Board Geometry/Assembly Notes Board Geometry/Any User Defined subclasses Drawing Format/ Any User Defined subclasses Manufacturing/ Any User Defined subclasses Delete dimensions Deletes existing dimension text. Move text Moves dimension text. Change text Allows you to change text strings.Edit Leaders Allows you to edit leader lines such as adding a vertex.
Instance based parameters
Along with the normal global parameters that you can set you can also set instance based parameters. Just as with instance based shape parameters, the text that is highlighted in blue allows for an instance to have a different parameter than the global setting.
In the image below the connectors were dimensioned with the global parameters and then an instance based parameter for the tolerance of +/- .01 IN was applied to the connector on the right.
In this example an instance based dimension that used dual dimension was applied with the secondary dimension being below the primary.
Migration from older releases
When upreving a design the dimensions will remain in a non-associated manner. In order to get the associative behavior, all dimensions, leaders etc. will have to be deleted and added back into the design.
Downreving a design to a previous release
All dimension elements will remain in the design however the association will be removed.
Frequently Asked Questions (FAQ):
How do I delete associative dimensioning? You must use the “delete dimensions” command associated with the dimension edit environment.
What happens if I delete the object the dimension is attached to? The dimension would be deleted as a result.
How do I move dimension leader lines and text? Use the “move text” or “edit leaders” commands associated with the dimension edit environment.
After moving a component in the y-direction, the dimension text does not maintain its former y position. What can be done to maintain the former y location? Consider using the “Lock dimensions” command to lock the text in place prior to moving the component.
What does the color blue represent in the parameter forms? Parameter form changes apply to future dimensions that are added. They do not apply to existing dimensions. Instance Parameter form – changes apply only to the dimension you select in the canvas.
Please share your experiences using this new 16.5 capability.
Jerry "GenPart" Grzenia
Hi Dhamodharan, You might want to contact your local Cadence Customer Support team at http://support.cadence.com. They can assist you with this question.Jerry G.
Hi.. i am new to pcb editor. When i am using the dimension environment , whether i am moving the dimension means can i view the dim text parallely with cursor moving.In OrCAD Layout 16.2, when ever we dimension means, the dimension and text will be mover parallely,but that option is not get enabled in editor.
(Ex:-) If i am select the dimension at particular grid to other grid means, the distance take from particular grid is took as zero distance and from there, the dimension is get is marked. This is been done in layout. But in editor it is not possible.. Any person provide the solution for this problem. Thanks & Regards Dhamodharan
Hey - thanks Rz for posting the workaround and sharing it with the community!
Thanks Jerry - I determined a way to work around "exploding" dimensions by using the "create detail" command. It's not a perfect solution but it's something...
Currently, there is no method of breaking or exploding dimensions into native elements.
Is there any way to "break" a dimension element into it's native line, shape, and text elements so it can be manipulated outside of the dimensioning environment?
We don’t have any method of removing dimension association.
If the board outline is on grid you could select grid points that are close to the corners of the board. In this way the dimensions would be correct for the board outline, but would not be associated.
Could you explain why you don’t want to have the dimensions associative?
How do I de-assoicate the dimension from the board outline? Is there a work around?
I've checked with one of our Allegro Customer Support experts and he indicates that when you delete a dimension it should not delete the others. He asked about the 16.5 HotFix versions you're using. It might be best to file a new Service Request at http://support.cadence.com.
Is it possible to delete a single dimension in 16.5 without deleting all other associative dimensions? For example, I put in the datum 0 on x axis but was not happy where it landed. Instead of stopping dimensioning of all other objects and removing this mess-up first, I finshed dimensioning the rest of the board. Now when I try to delete only the messed up dimesnion, all other dimensions disappear as well.
Yes, in 16.5 Allegro PCB Editor provides associative dimensioning. This means that once an object is dimensioned, if the object is moved the dimension will update to reflect that change.
Prior to 16.5 you would have to manually update the dimension.
Hi, Dimension is defined for PCB length. Is there any way, dimension update automatically, if PCB length is modifed afterwards?
I received the following details from one of our expert Allegro Support AEs:
I have dimension that I need to rotate. How can I accomplish this?
The ‘Align text with dimension line’ setting, either as a General or Instance parameter, can accomplish what you are asking for.
If you have dimensions already added to the design and wish to rotate these to be aligned with the dimension line select
Manufacture > Dimension Environment
Right mouse button “Instance Parameter”
Select, with the left mouse button, the dimension you want to rotate
In the’ Text’ tab of the Dimension Parameters UI select ‘Align text with dimension line’
When datum dimensioning all of the text is place in the same direction. How can I rotate the text 90 degrees so it is in the porper orientation.
I asked one of our Allegro PCB Editor Support AE experts about this. He states - "I don't think this is possible with associative dimensioning although I would think that we should be able to add the dimension text as ‘mirrored' so that when the design is mirrored that the text is ‘correct reading’"