[Retric]

You messed up at your last step 1 millionth = 1mm, 10 millionth = 0.1mm, 100 millionth = 0.01mm

0.01mm is very difficult when you’re talking large custom objects with complex shapes.

[starkrights]

I think the original commenter is right- correct me if I missed what you’re getting at.

Keeping it all in the same units until the end here:

1 millionth of 1 meter = (1 / 1,000,000)m = (1e-6m)

1 millionth * 100 = 100 millionths => (1e-6m) * 100 = (1e-4m) = 100 millionths

(1e-4m) = .0001m | 1m = 1000mm => .0001m*1000 = .1mm

[Retric]

Ops, 100 ( 1 millionths of a meter) is a much more reasonable tolerance here than 1 / (100 millionth) of a meter.

I am to used to people saying 100 millionth of a meter to mean 10 nm or 0.01 µm which would have looked insane if I had written that.

Aka 100 millionth vs 100 millionths

[dale_glass]

Oh, English fail on my part then. I had assumed that 100 millionths of a metre == 100 * 1/1000000.

[eis]

The german site of the source speaks of 0.1mm so you were correct

   > bei Toleranzen von teilweise nur 0,1 Millimeter

https://www.ipp.mpg.de/de/aktuelles/presse/pi/2020/01_20

[Retric]

No your correct, I just read it wrong. Really needed to pay attention to the s.