Allowing for Expansion in Door Panels
Tips on sizing raised door panels to allow for wood movement. February 26, 2007
I am starting to build raised panel doors using standard cope and stick router bits that cut a 7/16" cope and panel groove. I cut my raised panels so that there is a 1/4" space for expansion at each stile. My question - what is the maximum width I could make the raised panel and not have the door fail due to expansion exceeding 1/2' across the width of the panel?
From the original questioner:
I gave incorrect dimensions above - my panels allow for 1/8" movement on each side for a total expansion of 1/4" across the panel. I am looking to find out what the largest width panel I can make without exceeding 1/4" total expansion.
From contributor J:
Check out the lumber/timber calculators on the main page of this site. Red oak will move as much as 1/4" per foot of width with changes in humidity. I'd say if you use this as a measuring device, you'll be in good shape. My shaper cutters cut a 3/8" groove and I try to keep everything under 16". I have not had a problem in hundreds of doors.
From Gene Wengert, forum technical advisor:
In the extreme, you might see an increase of 7% MC from when the panel is manufactured. Use this value with the calculators here.
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: Cabinetmaking: Cabinet Door Construction
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.
335 Bedell Road
Montrose, PA 18801
Copyright © 1996-2019 - WOODWEB ® Inc.