What am I doing wrong, or is there something else? - Router Forums
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post #1 of 21 (permalink) Old 05-23-2017, 05:10 PM Thread Starter
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Default What am I doing wrong, or is there something else?

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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post #2 of 21 (permalink) Old 05-23-2017, 05:24 PM
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Originally Posted by collinb View Post
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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Collin brand new cheap can be part of your problem. I had that happen to me about two weeks ago. Another thing is use another piece of wood right behind the piece your routing. That should solve the problem.
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post #3 of 21 (permalink) Old 05-23-2017, 05:25 PM
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RT???
bearing guided???
freehand??

This would have been the week that I'd have finished chewing thru the restraints...
If only new layers hadn't been added....

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post #4 of 21 (permalink) Old 05-23-2017, 05:35 PM
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@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.

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post #5 of 21 (permalink) Old 05-23-2017, 05:56 PM Thread Starter
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@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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post #6 of 21 (permalink) Old 05-23-2017, 07:59 PM
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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.

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post #7 of 21 (permalink) Old 05-24-2017, 09:08 AM Thread Starter
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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.
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post #8 of 21 (permalink) Old 05-24-2017, 09:11 AM
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Are you using the fence on the RT or are you freehanding on the RT...?

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post #9 of 21 (permalink) Old 05-24-2017, 09:14 AM
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Did the grain have a swirl pattern where it tore out? I've seen wood that close to a large knot do similar to that before.
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post #10 of 21 (permalink) Old 05-24-2017, 09:18 AM Thread Starter
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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.
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