You selected a difficult board construction considering you say you are new to this, and do not have an easy way to sand the final assembly.
I guess things are only difficult if you know they're supposed to be that way when you start.
Actually, I watched the video in the tutorial section and was inspired.
When you say you can feel the glue joints, do you mean the glue lines are slightly "proud" of the wood.
That's exactly what I am talking about.
You did not say how you sanded. Free hand with sand paper or using sand paper on a block, etc.
I have an older Craftsman belt sander with 36 grit belts I used for the heavy sanding and then I used a palm sander with 120 paper on it to smooth them out. The wood is smooth, just has slightly raised glue lines on them.
The oak and especially the poplar are soft woods. The glue line is going to be much harder than the rest of the board.
This is what I was trying to avoid. I have a couple friends that are chefs and was talking with them about the boards and discussing how to protect their knife edges.
You could try attaching sand paper to a very flat surface, e.g., glass and then moving the board over the paper.
I have a granite slab I use for this purpose. Mine is 12 in x 18 in. I use PSA paper.
Even if you have a flat sanding surface, it is possible the abrasive is just going to remove more of the softer media (the wood) than the glue line. You may end up having to accept this.
That's a great idea. I just don't know if I have anything around here I could use...
Would a jointer help? Or would the glue just dull the blade more than what it's worth?
I have attempted to attach a file of a face grain board I recently made. I think such a design would take you less time and could be done with your present tools easier than end grain.
Your board is beautiful! What did you use for the inlay around the edge?