Whenever I use a round-over bit on my router I end up with a small edge
where the roundover bit ends. I have tried to adjust the router height
so that you can't see this and even though I can get it close it's
always there. I am cutting dozens and dozens of pieces and end up
having to sand each of them after using the router.........a major
Does anyone have any suggestions for me?
Typically I have had this problem also, but I find the amount of
sanding minimal. You might find roundover bit that would reduce this
to almost a nonexistant problem, but with a good bit, I would think the
amount of effort to clean up this line not to be a concern. I would be
interested in other woodworker's reaction to this this perceived
Perhaps your workpiece is not as flat as you might think it is. IOW both
opposite faces must be in the same plane.
If sanding and scraping ain't your game then try a dish bit, basically a
wide, planing router bit.
Will a dish bit do the same thing as a roundover bit? Sorry John I am
a complete novice! I build fishing lures and wouldn't mind the sanding
but when you have literally hundreds to work with it becomes very
I have tried adjusting the height dave but can't ever seem to get it to
go away "completely". I am using hard maple so the sanding part is
I have tried a flat file to sand them, sandpaper, a drum sander on my
drill press, a belt sander, they all work but the amount of time needed
to correct the problem is considerable and it really wears me down
after doing 30 of them.
After seeing others' responses I think perhaps I misunderstood your
original question. Sorry. The only other suggestion I might make then
would be that perhaps a slightly thinner workpiece might help. If you
can post a photo or drawing of the problem you'd likely get definitive
I agree with Dave. The bearing is slightly narrow or (I have had two
roundover bits like this) the cove of the bit is less then 90 degrees.
They both went in the garbage. I stick to higher-end router bits now.
Is your roundover bit is actually that and not a bead bit? If so, your
bearing is too small. You can fix that by using a fence. If the "edge"
is on the side of the board rather than the edge your depth setting is
The other possibility is that you are trying to round over *both* edges
to form a half round. If that is the case, you'll get a slightly
asymetrical shape with the "edge" you refer to. That is because when
you do the second edge the bearing is riding on an area that was cut
when you did the first edge - it is inset slightly. The easy cure is to
use a fence. A less easy one is to add a piece of fiberboard or such on
top and use a top bearing bit running on it.
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I get this all the time. You can't rely on eyeballing the bit height.
Simply retract the bit, bit by bit (!?) until the edge disappears.
Remember, if you're not practicing on scrap, you're practicing on your
On 30 Dec 2005 18:31:12 -0800, email@example.com wrote:
1. Your bit might not be sharp ..you ARE routing hard maple! Also,
there are good bits and cheap bits.
2. Some might not agree, but I have occasionally [carefully!] started
from the end, routing in the backward direction for a VERY short
distance, then going to the beginning and routing upto that point.
I had this problem also. I always got this router edge when I attempted
to round over a corner.
I went to rocklers or maybe it was woodcraft and told them the problem I
was having. It's been a while but what I had been sold before was a
beading bit not a round over bit. When I got a round over bit the edge
IF you are talking about the top of the bit at the widest part of the cut,
you need to raise the bit so that it does not cut as deep. Yes the round
over will not be complete but minor sanding corrects that. That sanding is
much easier than having to take out a ridge caused by cutting too deep.
If you are talking about the round over near the bottom at the bearing, get
a new and or better bit.
Yes. Sounds to me that the bearing has worn and is no longer terminating
at the same edge as the cutter. IOW.. the bearing isn't keeping the
cutting radius away from your work-piece adequately.
Put a little filament tape over the bearing (increasing its diameter)
and test at slow speed if you can. The worse thing that will happen that
the piece of tape will fly off, but by that time, you'll have confirmed
Sometimes there is a little flange washer between the bearing and the
cutter creating a line.
The other possibility, already mentioned by other crew members, is that
you're riding the bearing on a surface which has already been rounded
over, allowing the cutter to go too deep.
BTW.. does that line show up when rounding over a large piece of wood?
Like a piece of 2 x 2?
A great many of the responders didn't seem to not have read the orriginal
post. He said that he had reduced the problem by adjusting the HEIGHT of the
bit. It would appear that the problem is not on the side. The bearing would
not have anything to do with it. The solution is simple. If it is cutting to
deep, back it off.
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