Dave Bishop

I would like to reproduce the "cyma recta" profile as part of a built-up crown molding, but cannot find anyone who sells such a bit. The "cyma recta" is essentially a shallow Roman ogee profile. For an example, see FWW #166, p. 74 (Dec. 2003). Has anyone got any suggestions?

I have thought of trying to combine a 3/8" radius roundover and a 3/8" radius cove, but I would need to run my stock at 30° to vertical for the roundover, and even then I would cut out more than I need (bit would engage entire 90° face while need only 60° of a cut. Thanks for any thoughts.

Advertising

__________________
This advertising will not be shown in this way to registered members.
Register your free account today and become a member on Router Forums

bobj3

Hi Dave

They make just about all the molding bits for the router

Here are just some of them, the one I like best is the 1st. one on the list.


http://cgi.ebay.com/1-PC-1-2-Shank-R...742.m153.l1262

http://cgi.ebay.com/2-pc-1-2-Shank-R...742.m153.l1262


http://cgi.ebay.com/1-PC-1-2-SH-2-5-...742.m153.l1262

http://cgi.ebay.com/1-pc-1-2-Shank-S...742.m153.l1262

http://cgi.ebay.com/2-pc-1-2-SH-2-5-...742.m153.l1262

http://cgi.ebay.com/1-pc-1-2-Shamk-R...742.m153.l1262

http://cgi.ebay.com/1-PC-1-2-SH-Base...742.m153.l1262

http://stores.ebay.com/Super-Carbide-Tools


http://en.wikipedia.org/wiki/Molding_%28decorative%29

===========

__________________
Workshop Projects
Router Tables plans FREE, plus more
http://www.absolutelyfreeplans.com/W...p_projects.htm

RW Router Tip Archive
www.routerworkshop.com/router_tip_glossary.html

Floating Mortise & Tenon: A strong and Silent Joint

Dave Bishop

Thanks for the suggestions, but none of these bits will do the job for me. I am not looking to make a one-piece traditional crown, but want the cyma recta profile as part of a built-up crown like the one I referenced in FWW.

Dr.Zook

Welcome to the forums Dave. Do you live in Ohio?

__________________
Dave
the "Doctor"

In woodworking there is no scrap, only firewood.

bobj3

Hi Dave

Please,,, How about a snapshot of
" see FWW #166, p. 74 (Dec. 2003) " that one is 5 years old and I don't have it any more ..




========

__________________
Workshop Projects
Router Tables plans FREE, plus more
http://www.absolutelyfreeplans.com/W...p_projects.htm

RW Router Tip Archive
www.routerworkshop.com/router_tip_glossary.html

Floating Mortise & Tenon: A strong and Silent Joint

Hamlin

I think I'm missing something here. If I'm understanding the "definition" correctly, all you need is a cove and round-over. You can make a "bevel" fence to get the "degree" that you're after. Again, I might be misunderstanding.

http://rds.yahoo.com/_ylt=A0geu7Orl.....org/wiki/Cyma

Bevel fence: http://www.routerworkshop.com/bevelfence.html

__________________
Ken

(On temporary leave of abscense)

"A VETERAN"
"Wether active duty, retired, national guard or reserve - is someone who, at one point in their life, wrote a blank check made payable to "The United States of America", for an amount of "up to and including my life". That is HONOR, and there are way too many people in this country who no longer understand it." -Author Unknown

Dave Bishop

Hamlin and others,

I have decided to try a "bevel fence", which I understand is an angled fence (in my case, I need 30° off of vertical, angled toward the bit). I will need to take the bearings off my bits so they clear the workpiece, for in each case, the cove and roundover bits are designed to take a 90° bite while I need only 60°. Because of this, the roundover bit will make a little notch where I don't need it, but it will be hidden when I stack the various profiles. I'll let you know how this works out. Thanks for your suggestions.

karateed

Hey Dave,

How about posting a few pics of your results?

Ed......:-)

Charles M

Dave,

Will any of these help?:

http://www.freudtools.com/p-187-wide...ng-system.aspx
http://www.freudtools.com/p-111-crown-molding-bits.aspx

__________________
Charles M
Freud America, Inc.

Dave Bishop

To review, I was trying to make a "cyma recta" profile, a sort of flattened Roman ogee, as part of a built-up crown molding. While several of you have asked me to post pictures, I have tried this evening, but nothing happens when I push the "upload" button, even after several minutes of waiting. I have sent a note to the webmaster asking what to try next. Any thoughts from those of you who have uploaded images?

I am happy to report that I was more successful in the shop than at the keyboard. I built a 30° fence of MDF and was able to complete my prototype molding in three steps: (1) run 1/2" thick stock past a 3/8" roundover bit (bearing removed) using the 30° fence; (2) run stock past a 3/8" cove bit (bearing removed) using standard fence and stock flat on table, leaving a tiny step where the profiles met, for fear of overcutting it; and (3) a little hand sanding with 220 to remove the step.

I know this means little without photos, and I will post them if/when I solve that problem. Thanks to all for your suggestions. This is my first thread on this forum, and I already have the impression that it is one of the friendliest forums out there!