Fitting for side channel blower

[annoyed]

My first drawing whit 0 conflicts!

Took 2 hours, to figure out what dimensions and constants can /can’t use.

Sadly after Pad, errors populated.. but I'll remember time when there aren't any!

[chrisb]

If you can't get it sorted, ask in the Help forum.

[bejant]

My first drawing whit 0 conflicts!

Your screen grab shows that you still have Conflicting Constraints in your Sketch, so you should fix that. Your 83 mm, 32 mm, and 76,16 mm Constraints conflict with one another, you only need two of these three Constraints (I used 83 mm and 32 mm, while the blue Constraint doesn't control the geometry and instead is driven by the geometry). You can make your Sketch much simpler by applying Constraints a bit differently:

20190915a.png (44.21 KiB) Viewed 2870 times

20190915-annoyed.FCStd

(13.9 KiB) Downloaded 69 times

OS: Ubuntu 18.04.3 LTS (ubuntu:GNOME/ubuntu)
Word size of OS: 64-bit
Word size of FreeCAD: 64-bit
Version: 0.19. (dated 2019-08-21)
Build type: Release
Python version: 3.6.8
Qt version: 5.9.5
Coin version: 4.0.0a
OCC version: 7.3.0
Locale: English/UnitedStates (en_US)

[annoyed]

Absolutely Right, that result calculator also say.. but.. ...I start construct that whit circles, ( it came first on my mind ) so that leads some quite interesting trigonometry...

Source: https://postimg.cc/D8fnCTSG

[Shalmeneser]

Absolutely Right, that result calculator also say.. but.. ...I start construct that whit circles, ( it came first on my mind ) so that leads some quite interesting trigonometry...

82.9 < 83 because 82,9 is not a diameter !