Scaling a sketch maintaining dimensions and constraints

[greenwoods1462]

Hello,

I am trying to scale the attached sketch.   I want to reduce by 50%.   But when I am in sketch and use the modify>scale, I lose the dimensions.  Is there a way that I can use the scale function at the same time automatically scale the dimensions.   So in this case my dimensions would reduce by 50%.

This is the profile of the tyre on a railway locomotive and I want to scale to lots of different sizes.

[jeff_strater]

yes and no.  Yes, you can get your sketch into a state where you can have dimensions that can be evaluated to represent different scales.  The usual method is to set a user parameter, called, say "scale".  Then, each dimension would have an equation that expresses its value as a factor of that scale.  Usually, this is pretty simple, say just a multiplication by "scale", for a length dimension.

But, no, in that there is no magic here.  As you have seen, the scale sketch command removes dimensions.  You will have to set up the sketch to be scalable yourself.

[jhackney1972]

Take a look at the Screencast.  I did not mention it but do not forget to return to the selection filters and check Select All when you are finished.  @jeff_strater method will make it easier in the long run because you will have a lot less picks and clicks if you have a lot of wheel sizes.

[jeff_strater]

I'm not sure that this gets you exactly what you need, but it's a start.  I just prepended "scale *" to each dimension (not the angle - that stays constant) in the sketch.