Router Forums banner

Roundover with eccentric radius

3K views 11 replies 9 participants last post by  Cherryville Chuck 
#1 ·
Hello,

I'm trying to match the roundover on a baseboard from my old Victorian house. I'm not well-versed in router bit profiles and what I think I'm looking for I've not seen anywhere. Essentially, the profile looks like a roundover, but it's eccentric. Basically, it forms a complex curve where the starting radius is 5/8" and the ending radius is about 13/16". I don't intend to match it exactly, but I can't find anything that might qualify as a round-over with an eccentric / variable radius of any size.

Can anyone suggest what sort of bit profile I might need to accomplish this?
 

Attachments

See less See more
2
#2 ·
#3 ·
It looks to me that the radius may be uniform but there is a flat on the bottom of it past the radius. An ovolo bit like this one can cut that but you might need a straight bit to lengthen the flat part on a second cut. https://www.jccayer.com/1-4-radius-...MI-6z09p-i2QIVh15-Ch0JQg2tEAQYBSABEgI__fD_BwE Ovolo bits come in a variety of sizes. You'll either need to use it in a table with fence or use an edge guide with the router.
 
#4 · (Edited)
#5 ·
I would have thought that the bit suggested by Tom is as close as you're likely to find.
The roundover bit shown but with a smaller bearing (readily available) really as good as it gets and is available in several radii.
 

Attachments

  • Like
Reactions: Herb Stoops
#6 ·
Hey Chuck,
Thanks for posting that bit from J.C. Cayer, they are located less than an hour from me and have all these wonderful tools. I looked through a couple of tools like routers and dust collection and saw both my King router and my King D/C.
I go to Ottawa regularly for business and I will be stopping there for it's on my way. I saw the Bosch and Hitachi routers also. I didn't know about this place, thanks.
Cheers,
Dan
 
#10 ·
It was a lucky accident then Dan. I searched for an ovolo bit and clicked the first one that looked good. Their prices look pretty decent.
 
#7 ·
Yup; I just bought my Bosch plunge base from them. My only caution is that a lot of the catalogue items adon't seem to actually be stocked(?)...they bring it in as they're ordered, or something.
Online Supply does something similar; doesn't really slow the mailorder process down it seems.
 
#11 ·
So I got busy and forgot about this thread until I got an email reminder - I had assumed no one replied... :)
@Danman1957, I hadn't considered a moulding plane, although I do have a pretty complex profile for the casing trim pieces that go around the windows and doors that I'll need to reproduce somehow. Fortunately, I happened to purchase an old Belsaw planer several years ago. A little investigation reveals that the original company still exists and apparently will make custom knives. A set of those for my trim and I should be good for life. :)

To the topic at hand, however, I'll probably rip an 1/8" from the face of the board rather than use a straight bit - I have a small, cheap router table and it's a bear trying to keep control of a large, long piece of wood in that. A careful setup and a single pass on the table saw will handle that flat spot much better, I think.

Otherwise, per the other comments, it looks like I'll just get a 5/8" roundover and make it work. So long as the shoulders are aligned and the roundover profiles are reasonably close to make the coping work, I'll be satisfied.

Thanks!
 
This is an older thread, you may not receive a response, and could be reviving an old thread. Please consider creating a new thread.
Top