assembly features

[swhits]

hello,
I am working an assmebly with quite a lot of ADF's on it, when I "tweek" the features the next higher assembly's relationships fail, I am not changing the hole or reinserting them but changing the dimension values for the features, have any of you ran into this? I was under the impression that the relationship would stay as long as the feature was not "new". Also is there a way to change the "persicion on relationships ie. from 5 to 2 decimal places.

 

[donyoung]

Hi,

AFAIK, changing the dimension of a Hole-Feature (not cutout) will create
a new hole feature (which is transparent to the user) and thus the relation
will fail because of the new geometric object (the circle that makes up the
base profile for the hole).

dy

 

[fredericmenage]

Hi,

I don't know why your relationship fails... For the number of decimals, you can increase it when in the asm file by going to the menu File/File properties : 'Units' tab, by increasing the precision.

Fred

 

[fredericmenage]

Hi again,

Sorry, to change the precision, it's not with the File properties as I thought... In fact, you need to check what is the dimension style used by default when you create a dimension in a sketch (see style at top left). Then, go to the menu Format/Style/dimension, choose te correct style, click 'modify', go to the 'units' tab, increase the number of decimals in the round-off, click 'OK' and 'apply'.

Fred

 

[beachcomber]

Don't forget that the rounding-off precision you see is purely for display only.
The actual dimension needs to be exact.
I've seen users fall foul of this many times when assembly relationships fail - the dimension says, for example, 27.25 but really it's 27.251347 etc.
This can occur especially with angles, which tend to have a coarser round-off set in dimensioning styles.

bc

 

[fwc]

swhits

Did you tweek the hole size, depth or position?

fwc