Hook Angle for Large Radius Cutters

      To cut the right profile, very large cutters need special attention to hook angle. September 10, 2007

Question
I make log cabin parts on a Pinero moulder and cut very deep and wide radii on the faces of the logs. I have problems getting knives that will cut the correct radius I want. My current knife manufacturer makes me the knives and a sharpening template. Both the knife and the template look right but don't cut correctly. Does anyone know how to fix this?

Forum Responses
(Solid Wood Machining Forum)
From contributor T:
The problem you are having is due to a lack of compensation for hook angle. In profiles that are very deep, the hook angle in your head can distort the profile depth. To remedy this problem the knives must be ground to a compensated profile based on the hook angle of your knife head and the cutting diameter. This will make the knives appear to have a much deeper profile ground in them but when they are run, they will cut the intended profile.



From Dave Rankin, forum technical advisor:
I agree with contributor T; the knives should be ground in a cutter head the same diameter and hook angle as you are using in order to maintain the exact profile. Another to talk to your grinderman about is the condition of his machine. There are problems on grinders than can also cause profile distortion.


From contributor A:
I agree with the above. Most likely it is just a hook angle thing. Sometimes it may be a good idea to have your cutter head checked for hook angle. I've had guys that think they had a 12* hook, but when they send me an image of their head, it turns out to be 20*. All you should have to do is put your head, hole down, on a piece of paper and trace around it. Fax it to your grinderman, so you guys can both be sure you're on the same page.


From contributor R:
I agree with all of the above. Imagine that, everybody agrees with each other. Good luck.

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: Solid Wood Machining

  • KnowledgeBase: Solid Wood Machining: Tool Grinding


    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 © 1996-2017 - 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