rounding length values 1

[abeschneider]

Guys,
I know there have been a couple threads discussing how to deal with the round function in Catia, but I'm confused how to effectively use it.

Let's say I have a value: "length" = 50.225mm

How do I round this to:

(a) no significant digits (ie: 50mm)
(b) 1 significant digit (ie: 50.2mm)
(c) 2 significant digits (ie: 50.23mm)

I haven't been able to figure out the combination of code to get Catia to do this for me yet; I'd really appreciate it if someone can help on this.

Thanks

 

[jackk]

Are you asking about parameters? or drawing dimensions? or something else?

 

[looslib]

Rounding of dimensions on a drawing is in ASME Y14.5-1994, 1.6.4, which references ANSI/IEEE 268.

Basically dimesnions are rounded to even numbers, so your 50.225 would be 50.22 as 2 significant digits.

The explainations is that by always going to even numbers, it reduces tolerance build-up, as some numbers go up and some go down.



"Wildfires are dangerous, hard to control, and economically catastrophic."

Ben Loosli
Sr IS Technologist
L-3 Communications

 

[abeschneider]

I should've been more clear in my question: I'm referring to parameters.

My example of "length" = 50.225mm was an example of a parameter in Part Design.

Being able to use Round with length parameters could enable some powerful knowledge-based part design functionality.

 

[abeschneider]

bump

 

[Akesson]

Hi,

try this

if "Lenght" is a lenght paramater and the value is 50.225mm
the round() command needs a real paramater as input. By divide 1mm you convert the lenght to a real.

a) (round("Lenght"/1mm))*1mm should give 50mm
b) (round("Lenght" /1mm*10))*1mm/10 should give 50.2mm
c) (round("Lenght" /1mm*100))*1mm/100 should give 50.23mm

 

[abeschneider]

Akesson,

Thank you very much! Your suggestion worked perfectly. I gave you a star in return

 

[itsmyjob]

this remind me something :

I just used search "round" and found Eng-Tips : 124350

Eric N.
indocti discant et ament meminisse periti ​

 

[abeschneider]

round and round we go