*UPDATE: For those interested in how I achieved the design, skip to 'CONSTRUCTION'.
I've constructed the following circular cutting board out of hexagonal sections of plywood and I'm trying to get the smoothest possible sides. As you can see based on this design, the grain is in all different directions.
I've tried straight flush trim bits but they result in a lot of tear out. I've also tried making a jig which allows me to rotate the piece so the side brushes past a belt sander but I end up with flat spots. I was thinking about spiral up/down cut bits or compression bits but my understanding is they focus creating a smooth edge as opposed to solving the problem of cleanly cutting through wood where the grain goes in all directions like in my case.
What are some recommendations?
CONSTRUCTION
I copied someone's design from TikTok. I used baltic birch plywood and cut pieces on a 60 degree angle using the table saw:
I then glued sets of 3 pieces together to form hexagonal rods:
I then cut the rods into pieces:
And glued the pieces together to form a board:
I then glued all the pieces together to create a large enough form from which I could get a circle of the desired diameter. Due to sloppiness in cutting the hexagonal rods I had pieces of varying heights and required planing:
I then made a very basic planing jig and used a router with a surfacing bit:
...which resulted in a board of uniform thickness from which I cut a rough circle with the bandsaw using a templating router bit and a template which I double-sided taped to the cutting board:
Resulting in:
As the previous process resulted in a lot of tearout (due to my poor gluing and wood grain going in many directions) I made a simple jig to rotate the board against the belt sander to try and further smooth the edges. This process left flat spots because I used a sanding cylinder with WAY too large a diameter:
And that's when I posted this question.