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Thread: will knots in wood mess up planer blades?

  1. #1
    Join Date
    Feb 2008
    Location
    Topeka, Kansas
    Posts
    311

    will knots in wood mess up planer blades?

    knots in wood seem to really nick the blades when im hand planing, i was wondering if they have the same effect on planer blades as im thinking about getting one but dont want to have to replace blades all the time

  2. #2
    Join Date
    Mar 2003
    Location
    SE PA - Central Bucks County
    Posts
    42,347
    Yes, knots can damage jointer/planer knives the same as they can with hand planes. Take very light cuts to minimize this and be prepared to shift one or two of the knives laterally after milling the knotty lumber to keep from marking future wood while the knives are still serviceable.
    --

    The most expensive tool is the one you buy "cheaply" and often...

  3. #3
    Join Date
    Apr 2007
    Location
    Stephenville, TX
    Posts
    914
    Mike, power planing knots is an issue for both machine and lumber. Knots are usually very hard and can cause issues with knives, as Jim said. Also, and I'm thinking mainly about aromatic cedar here as I plane a good bit of it, the grain change around the knots can cause a lot of tearout. And with knots a planer knife will occasionally pull one loose and that can cause havoc, from jamming in the planer to the point where you have to tear it down partially to get the knot out to bending or knocking something out of alignment.

    In knotty wood take very shallow cuts and be prepared nonetheless to deal with some "knotty" problems.
    And now for something completely different....

  4. #4
    Join Date
    Sep 2005
    Location
    Placitas, NM in the foothills of the Sandia Mountain.
    Posts
    527
    Yeppers. I've had the darn things "explode" in the planer - quite a racket even with ear protection.

    I will knock or drill most knots out now and fill with epoxy after milling, then clean with a scraper and sandpaper.

  5. #5
    Join Date
    Feb 2008
    Location
    Topeka, Kansas
    Posts
    311
    thanks guys. i made a somewhat similar post in the hand tools section about my knot problem with hand planes, i was hoping it wasnt as big a problem with the machine planers

    ok cutting them out sounds like a good alternative, what type of epoxy would i use to fill the holes? is there a specific wood epoxy? sorry if thats a dumb question ive never used epoxy before or paid much attention to it at stores

  6. #6
    Join Date
    Feb 2008
    Location
    Topeka, Kansas
    Posts
    311
    well i got some epoxy and i drilled out the knots with a forstner bit and put the epoxy in the hole and it looks like poo

    not sure what your supposed to do with the epoxy but it just turned into a big mess.

    oh also the epoxy i got came in a little twin tube thing with a plunger where you press the plunger and the two ingriediants shoot out and you mix them together but i used about 1/2 the tube on 2 holes so im thinking i got the wrong stuff anyways

  7. #7
    Join Date
    Jun 2007
    Location
    Wichita, Kansas
    Posts
    1,795
    Quote Originally Posted by Mike Gager View Post
    ...ok cutting them out sounds like a good alternative, what type of epoxy would i use to fill the holes? is there a specific wood epoxy?...
    There are a number of products on the market that are designed for repair of rotted/decayed wood. One of those is the first thing I'd think about. Do a Google Search for "epoxy wood repair" and you should get a number of references.
    Tom Veatch
    Wichita, KS
    USA

  8. #8
    Join Date
    Feb 2008
    Location
    Topeka, Kansas
    Posts
    311
    thanks tom, will do

    also good to see another kansas woodworker on the board!

  9. #9
    Join Date
    Apr 2008
    Location
    East Virginia
    Posts
    453
    Get yourself a gallon- or 3-gallon kit from West System or Raka.

    The stuff has a shelf life of decades, but believe me, once you know how, you'll use it up.

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