How model with measurements

As per diagram i have model. I want to make the handle of 180mm as mark in red. Its an Olympic weight plate.

I have tried so far.
weight plate.blend (819.4 KB)

Any suggestion or help how it works.

Are you sure that’s not a typo and meant to mean a 183cm (6 ft) bar?

Look at this for more of a scientific method…to early in the morning for me to get my head around but see if that works for you.

https://www.dummies.com/education/math/geometry/how-to-determine-the-length-of-an-arc-2/

Or you can try array an object around it by that certain distance and it should give the the start and stop. Just a thought. :slight_smile:

olympic weight plate.blend (889.7 KB)

I tried this but still not confidence