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vdevan1-Visitor
1-Visitor
July 28, 2018
Question

let weak dimension modify automatically

  • July 28, 2018
  • 1 reply
  • 5066 views

i have faced this problem often.. (and an annoying thing in Creo).. 

lets say i have a simple sketch as shown in the attachment, 

i have given the overall dimension is 120mm , now when i tried to change the overall dimension to 130mm , it won't change... 

i will have to delete the dimension (120) drag the curve to nearest point to 130 and then if i give the 130 dimension .. it will work .. 

is there way ti disable to weak dimensions from governing the curve and let it change automatically when i give a dimension .... ?

 

thanks in advance.... 

 

1 reply

KenFarley
KenFarley21-Topaz II
21-Topaz II
July 28, 2018

Creo needs the geometry to be fully defined. Thus, though you explicitly defined the overall height, and the radius of the arc at the top, you didn't give it enough. It "guesses" and puts the weak dimension you see. You try to increase the overall height to a value greater than the sum of the weak "side length" and the radius, so rightly enough the modification fails.

Why don't you just put another dimension in that defines the height from the center of the arc to the top of your sketch? Isn't that what you are looking for in the end, anyway?

V
vdevan1-VisitorAuthor
1-Visitor
July 30, 2018

as you have said it , creo "guesses" and puts the weak dimensions, and stubborn not to change when i wanted it to change unless i drag it.

as you have suggested, i could add the dimension from the center of the arc, but i do not want to control with that dimension, i want to control with overall height.. 

its a simple sketch here, but it puts me under tremendous stress when the sketch gets complicated ...

 

thanks anyway for your time .. 

HamsterNL
HamsterNL18-Opal
18-Opal
July 30, 2018

You will have to take a step back, and look at the design intent of your sketch.

 

Yes, you like to control the overall height, but as Ken states, you will have to put a couple more dimensions (or other constaints) into your sketch. You could for example add the width of your curve, that will get rid of the dimension to the center of your arc.

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