You mean that the blade in LUT part is too small compared to the real part? If so (after you re-check again your measurements!), here is a method that should get the job done:
- Enlarge the part (with rotation center set to origin) till its outside goes well inside outer rim. Use edger2 to get the unmatched outer line of blade shape.
- Do the same, this time shrinking inside inner rim. Get inner line
- use Coverer between these lines to build a blade.
- compute intersection lines with Isecalc between blades and rims.
- Enlarge the part (with rotation center set to origin) till its outside goes well inside outer rim. Use edger2 to get the unmatched outer line of blade shape.
- Do the same, this time shrinking inside inner rim. Get inner line
- use Coverer between these lines to build a blade.
- compute intersection lines with Isecalc between blades and rims.