Arched Jambs for Circle-Top Doors

      Quick tips on fabricating arched door jambs. May 16, 2008

Question
I am making a couple of full circle top cherry doors that are to be pre-hung. I am trying to figure out the best way to build the jambs for these doors. I don't own any steam bending tools - only traditional tools. Is there a way to build these without having to buy anything out of the norm?

Forum Responses
(Solid Wood Machining Forum)
From contributor G:
Laminate the head round the desired radius form (ignoring springback), then make the trim to the same radius as the form, less (or plus) the reveal. Then when you install the jamb, make it to the correct radius by shimming, then the trim should fit with the correct reveal. The door can be made to the true radius of the form less the clearance. Note: trying to allow for springback only makes for more work.



From contributor W:
When we make this type of opening we try to have the door opening framed square at the jobsite taller than the door opening. We then provide the framing that makes the opening round. We attach our jamb to our radiused framing. Then install the jamb and framing prior to wall finishes.


From contributor O:
The way I do them (I'm a moulder operator by trade but I do this too) is to resaw my lumber down to 1/4" and run it through a wide belt (both sides) down to 3/16". I have metal L brackets that I screw into a piece of MDF with my arch laid out. Then it's simple lamination until you get your thickness (with a stop, it's 1.25" - I run it through my M&M moulder to cut the plows). Then it's a matter of clamping the laminated stock down to the L brackets and letting it sit. A little trimming on the tablesaw (careful...), make the plow, do a little angle work to connect the legs, and you've got yourself an arched jam.

Would you like to add information to this article?
Interested in writing or submitting an article?
Have a question about this article?


Have you reviewed the related Knowledge Base areas below?
  • KnowledgeBase: Knowledge Base

  • KnowledgeBase: Architectural Millwork

  • KnowledgeBase: Architectural Millwork: Doors and Windows


    Would you like to add information to this article? ... Click Here

    If you have a question regarding a Knowledge Base article, your best chance at uncovering an answer is to search the entire Knowledge Base for related articles or to post your question at the appropriate WOODWEB Forum. Before posting your message, be sure to
    review our Forum Guidelines.

    Questions entered in the Knowledge Base Article comment form will not generate responses! A list of WOODWEB Forums can be found at WOODWEB's Site Map.

    When you post your question at the Forum, be sure to include references to the Knowledge Base article that inspired your question. The more information you provide with your question, the better your chances are of receiving responses.

    Return to beginning of article.



    Refer a Friend || Read This Important Information || Site Map || Privacy Policy || Site User Agreement

    Letters, questions or comments? E-Mail us and let us know what you think. Be sure to review our Frequently Asked Questions page.

    Contact us to discuss advertising or to report problems with this site.

    To report a problem, send an e-mail to our Webmaster

    Copyright © 1996-2016 - WOODWEB ® Inc.
    All rights reserved. No part of this publication may be reproduced in any manner without permission of the Editor.
    Review WOODWEB's Copyright Policy.

    The editors, writers, and staff at WOODWEB try to promote safe practices. What is safe for one woodworker under certain conditions may not be safe for others in different circumstances. Readers should undertake the use of materials and methods discussed at WOODWEB after considerate evaluation, and at their own risk.

    WOODWEB, Inc.
    335 Bedell Road
    Montrose, PA 18801

    Contact WOODWEB











  • WOODWEB - the leading resource for professional woodworkers


      Home » Knowledge Base » Knowledge Base Article