Scaling by percentage

Rhino Rhino for Windows
1

I have a question. When I scale my ring that is 17.45 mm Diameter by 5% it makes it 18.32 mm Diameter. I am using the 3d Scale command at ‘0’ and using 1.05 as the scale factor. This doesn’t seem right to me.

Any one know what I am doing wrong?

Thanks

2

Hi there,

I think you will find that 17.45 increased by 5% is 18.32 (rounded).
:smile:

-Rupert

3

Google agrees with your answer.
17.45*1.05

Mark.

4

So in making a ring and scaling it by 5% is normal in jewelry. Seems like too much for shrinkage to me.

5

Hmmm… if it seems too much, use a smaller number :ø)
I don’t know anything about jewelry but the first few hits tell me to get closer to 3%

http://www.artistryofgold.com/AOGmoldShrinkage.php
http://benchpeg.com/toolkit/the-jewellers-toolkit-factsheet-06-lost-wax-casting.pdf

6

Some more interesting info here.
Shrinkage in rings