Hi All,
Apologies in advance, I am not sure if I am posting in the right category.
I am looking for some advice as to how to solve this problem I am experiencing with adding multiple sub-assemblies to an assembly.
Please refer to picture for reference.
I have a master assembly with sub assembly A constrained in the default position in the top level. I have a second sub assembly B fixed in position in the top level assembly aligned with sub assembly A. There is a drive rod ( C) which is constrained as a slider in the top level assembly as is connected at either end to mechanisms within both A and B. The connections to A and B are defined as general coincidental constraint sets additional to the slider contstraint for C. ( Fig 1.) The movement of C actuates mechanisms within A and B (See Fig 2.) to have protusions extend out from A and B. This Assembly works as intended, moving C back and forth (by dragging) lifts and lowers the blocks ( red triangles) smoothly and without any issues.
The blocks have adjustable height ( amount they protrude) and this is controlled in the top level assembly by adding a connection at part level in sub-assembly being a fixed height from the datum plane in the top level. Sub Assembly B also has a part level connection of fixed height to the top level datum plane. ( Fig. 3) Modifying the the position of the the datum plane ( red line) adjusts the block height . This all works as intended.
The problems arise when I add a second sub-assembly B.( Fig.4) It is the sames as B but just rotated 180° to the other output from A. Beacause of the part level constraints to top level constraints in the first Sub assembly B, when constraining the second sub-assembly B it throughs up a dialogue box " This feature has external dependancy created in another location of this assembly, with redefine feature in original or current location as options. Both of these options if executed cause the model to fail. normally by disabling the one or both of the connections of B to the top level datum plane (red line.)
1.PNG
I dont want to create family table members of B and define different constraint sets for each, as I want the model tree and BOM to show the same sub assembly B being used. Also there could be an infinite number sub assembly B connected in line,
I have looked at making sub assembly B flexible, and calling up different part level ptc_constraint_set definitions but this hasnt been succesful in reaching the assembly intent.
Any assistance would be appreciated. Thanks.
Apologies in advance, I am not sure if I am posting in the right category.
I am looking for some advice as to how to solve this problem I am experiencing with adding multiple sub-assemblies to an assembly.
Please refer to picture for reference.
I have a master assembly with sub assembly A constrained in the default position in the top level. I have a second sub assembly B fixed in position in the top level assembly aligned with sub assembly A. There is a drive rod ( C) which is constrained as a slider in the top level assembly as is connected at either end to mechanisms within both A and B. The connections to A and B are defined as general coincidental constraint sets additional to the slider contstraint for C. ( Fig 1.) The movement of C actuates mechanisms within A and B (See Fig 2.) to have protusions extend out from A and B. This Assembly works as intended, moving C back and forth (by dragging) lifts and lowers the blocks ( red triangles) smoothly and without any issues.
The blocks have adjustable height ( amount they protrude) and this is controlled in the top level assembly by adding a connection at part level in sub-assembly being a fixed height from the datum plane in the top level. Sub Assembly B also has a part level connection of fixed height to the top level datum plane. ( Fig. 3) Modifying the the position of the the datum plane ( red line) adjusts the block height . This all works as intended.
The problems arise when I add a second sub-assembly B.( Fig.4) It is the sames as B but just rotated 180° to the other output from A. Beacause of the part level constraints to top level constraints in the first Sub assembly B, when constraining the second sub-assembly B it throughs up a dialogue box " This feature has external dependancy created in another location of this assembly, with redefine feature in original or current location as options. Both of these options if executed cause the model to fail. normally by disabling the one or both of the connections of B to the top level datum plane (red line.)
1.PNG
I dont want to create family table members of B and define different constraint sets for each, as I want the model tree and BOM to show the same sub assembly B being used. Also there could be an infinite number sub assembly B connected in line,
I have looked at making sub assembly B flexible, and calling up different part level ptc_constraint_set definitions but this hasnt been succesful in reaching the assembly intent.
Any assistance would be appreciated. Thanks.
