cancel
Showing results for 
Search instead for 
Did you mean: 
cancel
Showing results for 
Search instead for 
Did you mean: 

Relation in pattern to increment value for every instance

SOLVED
Alexandrite

Relation in pattern to increment value for every instance

hello

 

i have been using dimension pattern, where in, i have given the increment value for center to center distance as 4. 

i need the distance to keep reducing by 0.1 for every instance , like 

c-c for my first instance is 4 , 2nd should be 3.9 , 3rd is 3.8 .. and so on .. 

how can i achieve this using relation ... 

 

is there any command like "do while", "for" that can be used in creo ... 

Thanks in advance. 

1 ACCEPTED SOLUTION

Accepted Solutions

Re: Relation in pattern to increment value in pattern using relation

One way is to set up an equation for the memb_i value.

 

memb_i = di - 0.1*idx1

View solution in original post

11 REPLIES 11

Re: Relation in pattern to increment value in pattern using relation

Hi,

edit pattern definition and set relations. See following picture taken from CR2.

pattern.png


Martin Hanák

Re: Relation in pattern to increment value in pattern using relation

Hey Martin, 

Thank you for those pics.

I have found out that option to go to relation.

I am not able to successfully create a relation with those variables.

The logic is pretty simple, can do it with a do while command.. 

but i do not know how to establish a realiton in here (creo)... and am not well aware of the syntax... 

can you help me with some examples ...?

Re: Relation in pattern to increment value in pattern using relation

Unfortunately, there is no looping construct available in Creo relations. Do while, for, repeat until are all not implemented. All you have is if-else-endif constructs. The evaluation of relations is done in a sort of single pass way. It parses through them in order and does the calculations you need. I have if-else-else-...endif logical constructs that would be graded very poorly in a class with a more powerful language.

Re: Relation in pattern to increment value in pattern using relation

yes, i agree.. i went through the the available functions.. here ..

http://support.ptc.com/help/creo/creo_optm/usascii/index.html#page/optm%2Foptions_modeler%2Ffund_sev...

 looks like , there is no such function similar to DO WHILE or FOR ... 

 

but if you can find a way to achieve a the result i want with the existing functions ,  kindly help me out... 

 

(more over, this is a PTC community .. .is there a possibility for the PTC developers to look at these conversations.. looks like no body cares.. )

 

Re: Relation in pattern to increment value in pattern using relation

One way is to set up an equation for the memb_i value.

 

memb_i = di - 0.1*idx1

View solution in original post

Re: Relation in pattern to increment value in pattern using relation

Hi,

please investigate attached model created in CR2.


Martin Hanák

Re: Relation in pattern to increment value in pattern using relation

Hi , 

Thank for that equation. 

That seems to work .. 

can you please tell the variable "di" means.. 

 

but, i used the following equation and it worked .. 

memb_i = lead_v - (0.1*idx1)

 

Thanks a lot.. 

 

 

Re: Relation in pattern to increment value in pattern using relation

Hi Mark, 

Thank you for the file , it helped me understand .. 

Thanks a lot...

Re: Relation in pattern to increment value in pattern using relation

The variable di is the initial dimension selected to define the pattern increment. In your case lead_v = di = 4 I just specified the dimension in the equation directly instead of using lead_v.