I have made a shell plate layout of a bulk storage tank by un-wrapping the tank shell.

The tank diameter is 67083 mm

I need to dimension the angular positions of items on this layout.

I have made a dimension style which converts lengths to angles with a length factor of 360/circumference.

The accuracy of this is not good enough 360° ends up being 360.233°.

I have tried the same thing in Rhino 5 and the angle comes out perfectly.

Can I change the accuracy that Rhino 6 uses to calculate these things?

Version 6 SR7

(6.7.18190.21071, 9/07/2018)

Commercial

# Can I change the length factor accuracy in dimension styles

**Whitebait**#1

**pascal**(Pascal Golay) #2

Hello - here I see, for example-

500 radius -> 3142.593 circ -> factor = 0.114592

I get 360 for the overall length of the unrolled edge rounded to 2 places… slightly under if rounded farther out - is that the difference, rounding, in your example?

-Pascal

**Whitebait**#3

Hi Pascal

My tank is 21353 mm diameter and the circumference is 67083 mm.

360° / 67083 = 0.005366486 °/mm

When I enter 0.005366486, Rhino 6 appears to round this to 0.00537 °/mm

67083 x 0.00537 = 360.24° so there is a 0.24° error.

That is 67083 / 360 x 0.24 = 44.6 mm error.