Knife Griding for Cross-Grain Cuts
A quick tip on tuning up cutterheads for clean machining on cross-grain cuts. March 26, 2013
I'm considering the installation of a mist-lubricator on a custom molding machine. I discovered some time ago that simply spraying a little mineral spirits on the wood yields smoother cuts, especially on short or cross-grain. Unfortunately, much of my required profile cutting runs directly against the grain. This is a standard metalworking practice but what about an application for wood?
(Solid Wood Machining Forum)
From contributor D:
It works well for horizontal bandsaws as you can mist the blade just before it passes through the stock, but I would think maybe not so much for a paddle wheel type configured cutter. Some metalworking cutters have coolant/cutting fluid pumped from the inside of the cutter so the centrifugal force splays it outward.
I too have to deal with cuts against the grain, hogging off lots of stock at a time. What has helped the most is adapting corrugated hogger technology to standard cutterheads. That tiny sine wave grind, like a steak knife, works absolute wonders cutting across the grain. It doesn't make sense, but it works - very little force on the part, quiet, and almost no tearout. In a four-knife cutter, a finishing knife following a hogging knife works well. I even had a few sets of three knife heads where the hills and valleys of the sine wave were staggered on two heads, followed by a finisher. These cut 2 inch tenons and copes in 2 1/4" thick stock in one pass on a part on a CNC machine. I used to have to swing around and hit it four times before getting to the full edge depth because the part would come loose.
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
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.