Avoiding tear-in when trimming edges

      How to prevent splintering when trimming veneered edges with a router. June 20, 2001

I applied lacewood veneer to Baltic birch panels and then trimmed the overlap with a router bit. This caused some small splintering on the sides of the panel, across the grain. How can I trim so as to prevent this splitting?

Forum Responses
The type of bit used could have caused this splitting. In some cases, a spiral arbor bit will cause split when a straight arbor bit will not. Ask the supplier that sold you the router some questions. The tool of choice for trimming edges of veneered panels is a router.

Locke Wilde, forum technical advisor

Also look at the direction of the cut. If you feed with the grain, you will get less tear-out than feeding against the grain. Like a chisel or a plane, with the grain for finish cuts is better on lumber, as there is less risk for pull-out and splitting.

I would guess that you used a water-based adhesive (PVA). PVA glues can loosen up and lose their strength when exposed to high temperatures. The heat from the router bit probably loosened the glue, and the veneer was torn during trimming because there was far less bond strength.

One thing that may help you in the future when trimming veneer overhang flush to your core panel is to use a laminate trimming router, and on the end grain sides, run the router in the 'climb-cut' direction. And as always, trim these sides first before the long grain sides. Climb-cutting with a larger router can sometimes be more difficult to control, but with the smaller laminate trimmer, it's a piece of cake.

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: Veneer

  • KnowledgeBase: Veneer: Machinery

  • KnowledgeBase: Veneer: Techniques

  • KnowledgeBase: Knowledge Base

    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 © 1996-2021 - 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