Rounding the middle of two coves - Router Forums
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post #1 of 16 (permalink) Old 10-07-2018, 07:41 PM Thread Starter
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Default Rounding the middle of two coves

Hi, all. I’ve had limited luck that I cannot faithfully reproduce every time, so I wondered if there was a special double-roundover bit out there that I’m unaware of.

Here’s my desired project: I’m working with a 2x6. I’m using a cove bit on the four long side edges. This leaves a strip down the middle with sharp edges.

I’d like to round the 180 degrees of that middle ridge on each side without the need to flip the board, rounding half of the ridge each time, which has proven nearly impossible.

Is there a concave bit that can round two edges at a time on a strip of about 1/2”?
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post #2 of 16 (permalink) Old 10-07-2018, 07:59 PM
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welcome N/A to router fotums...


I have to admit that I'm having a tough time forming a picture in my mind...
can you submit a cross section of the profile you are trying to make/create???...
even if it's a crude hand drawn...
you can post pictures here from the device you are posting from...

This would have been the week that I'd have finished chewing thru the restraints...
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post #3 of 16 (permalink) Old 10-07-2018, 10:16 PM
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I think if you can find a bullnose bit with the proper radius and long enough, that might do what you want. You’ll need an edge guide to use it.

Someone I consider a master woodworker once told me that a master woodworker is not someone who never makes mistakes. He is someone who is able to cover them up so that no one can tell.
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post #4 of 16 (permalink) Old 10-07-2018, 10:26 PM
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Quote:
Originally Posted by Cherryville Chuck View Post
I think if you can find a bullnose bit with the proper radius and long enough, that might do what you want. You’ll need an edge guide to use it.
I thoughr bullnose too but wasn't sure...

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

Stick....
Forget the primal scream, just ROAR!!!
"SNORK Mountain Congressional Library and Taxidermy”
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post #5 of 16 (permalink) Old 10-07-2018, 10:33 PM
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Table saw for cove cutting. You can control the width/depth by changing the angle the wood crosses the blade. You could use a cove cutting bit for the narrow edges, but really large cove cutters are hard to find and you should use a router table for safety and accuracy. But you won't have control over the arc with that bit, that you will have with the table saw. Here's a video. It isn't really that hard to do on the table saw.

You can use your cove cutting bit to reduce the amount the saw will have to remove. The key is trapping the workpiece between two straight pieces and holding the workpiece down using push blocks. Using 2x6 means you can make a number of test cuts to work out the angle that gives you the right cut. You can also tilt the blade to change the arc. Sanding will likely be needed using this method.


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Last edited by DesertRatTom; 10-07-2018 at 10:36 PM.
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post #6 of 16 (permalink) Old 10-07-2018, 10:43 PM
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If I am imagining the profile right I think an ogee might work.
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post #7 of 16 (permalink) Old 10-07-2018, 10:51 PM
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other variations...

Hemisphere...


Dish/bowl..


Ball..


Halfround..

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

Stick....
Forget the primal scream, just ROAR!!!
"SNORK Mountain Congressional Library and Taxidermy”
Stick486 is online now  
post #8 of 16 (permalink) Old 10-08-2018, 12:20 AM
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I am also not sure I've pictured what you're doing either. It would really help if you drew the profile you are trying to make. doesn't have to be exact, although adding a couple of measurements would be helpful. Draw with a marker so it's dark, take a photo of the drawing and post that. Just store the picture on the device you're using to post with.

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post #9 of 16 (permalink) Old 10-08-2018, 01:18 AM
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Quote:
Originally Posted by DesertRatTom View Post
I am also not sure I've pictured what you're doing either. It would really help if you drew the profile you are trying to make. doesn't have to be exact, although adding a couple of measurements would be helpful. Draw with a marker so it's dark, take a photo of the drawing and post that. Just store the picture on the device you're using to post with.
What he is trying to do is cut a cove down the top and bottom of the edge of a 2X6. This leaves a 1/2" square strip down the center between the two coves and he is inquiring as to what bit he can use to round over the edges of the strip. I think the 1/2" bullnose that Chuck and Stick referred to is what he needs.

A double beading bit might work too.
https://www.amazon.com/Whiteside-Rou.../dp/B000K2C7ZY

Here is one i found for a 1/2" center rib to give it a radius.
https://www.amazon.com/Whiteside-Rou.../dp/B000K2C7ZY


Herb
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Last edited by Herb Stoops; 10-08-2018 at 01:44 AM.
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post #10 of 16 (permalink) Old 10-08-2018, 01:41 AM
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are you trying to make back to back coves???
is cove even the right descriptor here...
more profiles...



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

Stick....
Forget the primal scream, just ROAR!!!
"SNORK Mountain Congressional Library and Taxidermy”
Stick486 is online now  
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