Solidify modifier even problem

HI
I DONT KNOW IF THIS WAS POSTED BEFORE, THE AMOUNT OF THREADS TOO BIG TO FIND.

i made half of a circle in a certain shape

then extruded allong z axis.

i added a solidify modifier…

but i does’nt thickens it evenly.


i tried checking the boexs inside the modifier options like even thickness.
anyone know what might be the problem?
http://misc.cgcookie.netdna-cdn.com//pencil.png

Select All -> Ctrl+N

thank you

but why were their normals different?
i want to understand this.
i have adjusted all vertices - and their normals are fine. yet only these three are different.only the three at the center(which was a single edge that i subdivided) had outline normals.
i understand this thing generally, but what made these three change? because of the subdivide?
can you help me understand or give a good link about this?

I believe you started with a circle. Once you create faces from a circle the direction of the normals could be either in or out. Not sure why, but just remember to always recalculate normals afters extruding a circle.

Thanks alot!