Snipe Problems on a Through Feed Moulder 2: Top Snipes

      Checklist table of problems and solutions for moulder operators. December 1, 2006

Reprinted with permission from Diehl Machines, www.diehlmachines.com.

Troubleshooting Snipes on a Through Feed Moulder -
Top Snipes
Description
Probable Cause
How to Correct


A snipe on the top of a finished part created by the top spindle and on the leading end of the part.

Too little chipbreaker pressure.

Increase the chipbreaker pressure.

Chipbreaker too far away from the cutterhead.

Slide the chipbreaker toe towards the cutterhead. Be certain the toe does not hit the knife.

Sliver lifting stock.

Clean out the machine.

A snipe on the top of a finished part created by the top spindle and on the trailing end of the part.

Not enough holddown pressure.

Increase the holddown pressure or lock the holddown in place.

Holddown too far away from the cutterhead.

Slide the holddown towards the cutterhead. Be certain the cutterhead knives do not contact the holddown shoe.

Excessive stock removal with top head.

Increase the depth of cut with the first bottom cutterhead and/or the first top cutterhead.

Lower infeed roll too high.

Set the lower infeed roll 1/32" above the infeed table.

Chipbreaker too low.

Set the yield of the chipbreaker at 1/8" to the thinnest stock.

Bottom cutterhead is set lower than the outfeed table.

Check the setting of the cutterhead with the outfeed table with a straightedge.

A snipe on the top of a finished part created by the top spindle and on either or both ends of the part.

The holddown is not parallel with the bed plates.

Use a dial indicator to adjust the holddown shoe.

Stock may be bowed.

Run the stock into the moulder with the bowed face down.

Unsupported pattern on the outfeed table. The pattern rotates to one or both sides.

Place a support on the outfeed table to prevent the part from moving.

Pattern is unsupported by the holddown. The pattern rotates to one or both sides.

Create a special holddown for the part that holds the part down on both sides. Can be a counter-profile holddown.

Long stock is unsupported after leaving the moulder.

Place a table or conveyor under the stock to support it while it is leaving the machine.

Deep snipe from the first bottom cutterhead.

Check the setting of the first bottom cutterhead.

Thin stock.

When running thin stock it is necessary to set the chipbreaker and holddown shoes as close to the cutterhead as possible without hitting the knives. Thin stock finishes better if the ends are kept butted up.

Intermittent feedroll too high or too much pressure (only on machines with two top spindles).

Reduce roll pressure. Set the lower roll at 1/32" above the bed plate.

See other articles in this series at:
Bottom Snipes
Left Side Snipes
Right Side Snipes

Reprinted with permission from Diehl Machines, www.diehlmachines.com.


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: Setup and Maintenance


    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