So, I’m attempting to create an 18" wide column with a 30" footing. The footing consists of three consecutive discs, each one being 4" smaller in diameter than the one below it.
To do this, I:
- Created a circle with a 15" radius using the Circle tool (15" radius = 30 dia.).
- Then using the push/pull tool I raised the circle to create a 3" high disc.
- Afterwards, I used the Offset Tool to create a second disc 2" smaller on top of the disc I just created and repeated the process outlined above.
- After repeating this process four times I thought I would end up with a column 18" in diameter at the top of my structure. However, this is not the case. Instead I have ended up with a column that is 17 7/8" in diameter.
Not only that, but after closer scrutiny, I discover that the two discs between the base and the column are off too (short by 1/16" each respectively).
I attempted to compensate for this 1/16" deduction by offsetting each subsequent disc by 1 15/16" instead of the 2" offset that I had previously used. However, this had the opposite effect (see screenshot attached: image on the left is the first attempted column and the one on the right is the second).