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How to best duplicate a routed profile?

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Forum topic by Dangerous1 posted 04-20-2021 12:07 PM 321 views 0 times favorited 9 replies Add to Favorites Watch
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Dangerous1

4 posts in 25 days


04-20-2021 12:07 PM

Topic tags/keywords: edge routing question

Hello! I need to duplicate a simple drawer front. What is the most efficient process to determine which combination of bits and depth settings to use?
Thank you!


9 replies so far

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DevinT

801 posts in 51 days


#1 posted 04-20-2021 01:11 PM

A picture of what you are trying to copy would be very helpful. The steps required to match, for example, a Roman or Grecian ogee profile would be different than a roundover/chamfer.

However, if this is a vintage piece of furniture, there is a very real chance that the profile was created with a combination plane. If that is the case, you’re going to have to go to Lee Valley to get the router bits they sell for replicating different combinations. If this ends-up being the case, you’re going to have to know about cyma recta and cyma reversa curves that compose different profiles. For example, both a roman ogee and grecian ogee are comprised of different curves (called cyma) to provide different styles—if you can identify the coves and rounds, the next step is to use a set of Verniers (calipers) to define the height/depth of each curve.

The likelihood that you will need to design your own router bit is extremely low and unlikely.

If you can’t find a single bit or combination of bits from Lee Valley to replicate the molding, there is always the route of getting a combination plane and setting it for an exact match. That may actually be an easier (albeit expensive) approach.

-- Devin, SF, CA

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Dangerous1

4 posts in 25 days


#2 posted 04-20-2021 03:38 PM

Thank you for the thoughtful reply. Fortunately, for me at this point in my woodworking, this is not a complicated profile.
It involves a 20 degree bevel to the back which I’ll probably do on the table saw. When there are a just a couple curves and round overs involved is there standard procedure for how to order the cuts or is it a trial/error/refine process? Or a top to bottom or deepest to shallower cut order? I’m willing (and likely!) to do the former, but I’d prefer not to reinvent the wheel if there’s already a straightforward process.

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John Smith

2925 posts in 1247 days


#3 posted 04-20-2021 03:46 PM

D1 – welcome to the forum.
as indicated, a sketch or drawing of what you want to accomplish
will get you the most accurate suggestions.
also – what kind of volume are you talking about ?

-- there is no educational alternative to having a front row seat in the School of Hard Knocks. --

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Dangerous1

4 posts in 25 days


#4 posted 04-20-2021 04:45 PM


I did say simple, right? None of my bits has a matching curve although making my life easier and actually going buy one isn’t out of the question—-but I only need it for 5 drawer fronts. If I can get close enough I’m not above reworking the existing ones to match.
If I can do this, I do have another more complicated project to move on to.

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Loren

11193 posts in 4732 days


#5 posted 04-20-2021 04:52 PM

I think you’ll want something similar to this or MLCS #7854.

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DevinT

801 posts in 51 days


#6 posted 04-20-2021 04:58 PM

This can be made with an ogee raised panel bit (bottom curve) plus a dovetail bit (top chamfer) and a roundover bit to blend the two surfaces.

-- Devin, SF, CA

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DevinT

801 posts in 51 days


#7 posted 04-20-2021 05:00 PM

Example roman ogee panel bit

-- Devin, SF, CA

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DevinT

801 posts in 51 days


#8 posted 04-20-2021 05:02 PM

Actually, I think Loren’s is a closer fit and would be more efficient.

Nice find Loren

-- Devin, SF, CA

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Dangerous1

4 posts in 25 days


#9 posted 04-20-2021 06:49 PM

Thank you both! Devin, I’ll give your suggestion a shot and if I can’t pull it off, I’ll certainly follow Loren’s advice and actually buy the tool I need.
I appreciate your responses.
(PS – I really hate this style of drawer front, but until I have the time and skills to change them all to something else, this will improve the current situation.)
Cheers

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