How To Determine Radius of a Rail and Stile Profile - Router Forums
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post #1 of 47 (permalink) Old 06-21-2015, 03:10 PM Thread Starter
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Default How To Determine Radius of a Rail and Stile Profile

I'm trying to duplicate the roundover profile of the rail and stile on a furniture drawer front. I did not make the furniture. I laid a straight edge from the shoulder (fillet?) to the edge of the roundover and extended a perpendicular line from the edge of the roundover to the straight edge. Is this intersection the radius?
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post #2 of 47 (permalink) Old 06-21-2015, 03:41 PM
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Originally Posted by JIMMIEM View Post
I'm trying to duplicate the roundover profile of the rail and stile on a furniture drawer front. I did not make the furniture. I laid a straight edge from the shoulder (fillet?) to the edge of the roundover and extended a perpendicular line from the edge of the roundover to the straight edge. Is this intersection the radius?
I honestly did not understand what you said...

lay the straight edge on the face of the drawer....
measure from the bottom of the straight edge down to where the RO begins...
that number should be the size of the RO if the RO is a true quarter round......

unless....

bear in mind that you have true radius as in a real curve, thumb nail radii/profile and finger nail radii/profile that are more like sweeps than curves...
some of these can be very deceptive because only a portion of a roundover bit was used...
to really match what you have is to use radius gauges... 5/6 bucks a set...
they come in SAE and Metric.. look like a set of feeler gauges and have concave and convex gauges/blades...



or.....


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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Last edited by Stick486; 06-21-2015 at 03:44 PM.
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post #3 of 47 (permalink) Old 06-21-2015, 05:50 PM Thread Starter
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Default Drawer Pictures

Pictures are attached. The rails. stiles, and center are 1/2 inch thick and glued to a backer piece.
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Last edited by JIMMIEM; 06-21-2015 at 05:52 PM. Reason: Adsd info
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post #4 of 47 (permalink) Old 06-21-2015, 07:22 PM
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Boy that is a tough one. You might get one of those profile gauges that has the small pins that move when you press it up against the profile and then shows both the male and female cross sectional pattern of the profile. If you don't already have one they are in most tool catalogs,like Lee Valley. Not very expensive but not used too often. I think Rockler and WoodCraft have them too.

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post #5 of 47 (permalink) Old 06-21-2015, 07:38 PM Thread Starter
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Good suggestion. I happen to have one. I'll give it a try. Thank You.
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post #6 of 47 (permalink) Old 06-22-2015, 09:04 AM
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And practice on scrap until you get it 'right'.

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post #7 of 47 (permalink) Old 06-22-2015, 09:15 AM Thread Starter
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I will do that. My problem is I only have standard profile roundover bits. If it's not one that I have then I'll have to keep buying until I get the right one. I'll be working on pecan/hickory which I understand require good sharp bits. I usually buy Infinity bits which aren't cheap.
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post #8 of 47 (permalink) Old 06-22-2015, 09:31 AM
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I agree with Stick486, but the models of gauges he shows are pretty limited and difficult to get into some places. You can buy sets that have individual pieces with multi male and female radii of the same length. You can also make your own one-off gauge by drilling a hole in something and sawing out a section of the edge of the hole. If you start with a 1/2'' hole you will soon see if you need bigger or smaller than the 1/4 radius it gives.
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post #9 of 47 (permalink) Old 06-22-2015, 09:35 AM
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take a piece of tablet card board and scribe it to fit your profile...
compare the cut profile to a circle of known size or the profiles of the RO bits you have...
consult on line router bit catalogs for addition 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 TaxidermyĒ
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post #10 of 47 (permalink) Old 06-22-2015, 10:28 AM Thread Starter
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I'll do that. My wife thinks the wood is pecan. Would you agree?
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