[collinb]

Building 3 corner shelves. Giving each a profile.
The first two went fine. But the third .... The bit grabs and tears it up.
(Doing three passes to try to avoid the problems associated with hogging out too much.)

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[collinb]

@collinb

Collin - can you give us more detail as to how you are doing this - ie: router table, fence, starter pin, are you doing a climb cut? It looks like there is a ridge in the middle of the profile - is that correct? More details would certainly give the folks here more to work with.

Router table. Bit is a Craftsman 25474, carbide with bearing. The edge curve is intentional.

So far what I have gathered is that I was going against the grain. But the other two came out perfectly cut.

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[collinb]

I can't find any reference for the bit you mentioned - perhaps it's old?? However I'll presume that it has a bearing at the top. You said you made three passes so, are you using a fence? Is the tear out at the end that went through first?

Still assuming here - if you are not using a fence, is it possible that the corner of the board hit the bit and caused the tear out - did you feel the grab or just see it?

So if that board is ruined, try flipping it over and send the other end through first and see if you get a smoother cut.

Typo. It's # 25454 cove and bead.

It happened two times on the same board.
After the first time I trimmed the bad part off with the band saw and tried it again with less angle. In neither case did the bit hit the end of the board.

What I think happened -- the larger boards had enough grain in both directions that I was going off the end grain toward the grain so there was nothing loose to grab. Like going around a circle on a larger piece of wood. This problem was on the smallest of the three so there was nothing like the end grain starting point to physically absorb board's stress.

Looks like the best solution will be to make the third, smaller shelf a large shelf then trim it down after the rest is done.

 

[collinb]

No knots.
Bit has a bearing so freehand on the end curve. A fence would get in the way. But on the straight face of the shelf I like to keep the fence close just for the extra support.

 

[collinb]

So tonight I picked up another piece of wood just to get the process going again. Restlessness.
This piece worked just fine, like the first two.

And wife has been using Golden Pecan stain on oak around the house so she tried it on the poplar. Looks good and will be a suitable tone match with other things in the house
(As much as possible I eliminated the green parts of the poplar.) So don't just paint poplar.

The Craftsman bit remains sharp. I do wonder who's product they private labeled. It's not a bad unit , not like the stuff from HD.

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[collinb]

I'm not a fan of poplar in general b/c of how easily it dents. But these will be out of the way and not hit. Plus polycoat protection.

The tear-out was at the beginning of the cut.

It seemed to be just this piece. Replacing it solved the problem.

 

[collinb]

Next time I do this, backer board it is.

To get rid of poplar green
(1) I was amazed to find one piece with no green in it for the replacement unit.

But for the other two
(2) I ripped the boards to remove all or most of it and re-joined them.