Blanks for Curved Mouldings

      Two ways to make curved blanks for machining into radiused moulding. May 5, 2007

I am making curved trim. I have made my blanks from MDF and solid wood. How do most of you glue the ends of stock together to make curved moulding? I have used scarf joints with a lot of success. I have also glued strips together. Both are very time consuming. I know some finger joint the ends. How do most people make blanks for curved moulding?

Forum Responses
(Architectural Woodworking Forum)
From contributor B:
An old timer that I used for my radius work for years always gave me segments which were fitted on the job, butt joint with biscuits. Paint grade was poplar; stain grade was out of the same wide board, if possible. I would prefer that the stock be pre-glued and then moulded since the joint is perfect, but he would not do this. Others I have used since, cut out MDF blanks in one piece on a CNC machine. Solid wood is glued up as wide boards (or precut to rough shape) with butt joints and biscuits, then the radius is cut with the CNC or band saw. The placement of the biscuit is critical. I am not a fan of FJ since it is visible down the road and unacceptable for stain grade. Laminations are too time consuming and not acceptable for stain grade to me. The joints have to be made somewhere. It's just a matter of who gets paid for them. I think it is a better job when done in the shop.

From contributor L:
We make a lot of curved casing. We give a choice of laminated strips or finger joined. The strips are made on a straight line rip saw and come off the saw clean enough to glue. Each board is V-marked on the face prior to ripping, so if the strips get mixed, they can be put back in order. We have a slotted holder on a cart so the strips are kept in order. Glue up is done using 3/4" steel banding on an adjustable steel jig frame. Very good tight glue lines result in a molding that most can't tell from solid. Finger joined arches are made from one wide board, miter cut, run with a miter carrier on a shaper for the fingers, then the rough curved shape is cut on the bandsaw, leaving clamping ears. By keeping the parts in order and paying some attention to figure, it looks much like a solid board. Final sizing of the blank can be done with the band saw and edge sander or on the CNC router. We use the same molder knives for the straight moldings as the arch shaper so the match is very good. Most installers use a decorative corner block between the curved molding and the straight. If the pattern will hold a Lamello, I like to do that.

Photo is of our arch molding shaper.

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: Custom Millwork

  • KnowledgeBase: Architectural Millwork: Moldings

    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 © 1996-2020 - 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