I keep tearing the end grain
I searched to see if this has been covered, maybe I'm not good at searching, so I apologize if I'm asking a q already answered many times.
I've been making narrow trays (4.5" wide 21" long) cut and rough sanded to final size. I then round over the edges on the router table. Near the ends it curves in making a cove, then reverses to make the outside of a circle.
I know that I'm going in the right direction, (not climb) but due to the shape of the tray, the grain is cut on part (creating a cove) in what turners call compressing the grain. Then the direction changes, and makes a circular end, so the cutters are pulling the grain apart as they cut. I get a very rough torn grain on those parts. I know many people are successful routing outer curves, but I haven't been able to get results that can be sanded smooth, as some fibers are pulled out and torn off.
I saw another post where someone cutting a circle had torn grain, and it was suggested that he climb cut on part, conventional on other part. The problem I see, is that the feed direction doesn't raise the grain, the direction the bit spins does. On one quarter of the circle, the cutter is pushing into the grain, cutting fibers that are supported by uncut fibers. Next quarter of the circle, the fibers are being pulled up away from the fibers under it, making rough, torn edge. We talk about this a lot in turning, seems to me to be a problem also with routing.
How can I get better results? It seems to me that the only way would be to have another bit spinning opposite, and change part way through the curve. Obviously, that can't be done.
Long way to ask a question, but other discussions I've seen didn't address this. Thanks for reading.
One more thing, the wood is 3/4", I'm putting a 3/8" radius top and bottom, and raising the bit slightly, making 3-4 cuts. I don't think I can be more gentle with it. I'll try to upload a picture, if so you'll see I also use a bowl bit inside, have the same problem with the inside curves.
Nope, can't attach the picture(?)