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Thread: Jointer H E L P!!

  1. #1
    Join Date
    Dec 2006
    Location
    Livermore CA (SF Bay Area)
    Posts
    51

    Jointer H E L P!!

    OK, I have done it again. I started to edge joint two boards, about 2 feet long and 6 inches wide, 1/2 inch thick.

    Started with the outfeed table at an equal height as the knives (as determined by taking an 1/8 inch off a soft piece of redwood and raising the outfeed table to match). I believe my infeed and outfeed tables are coplanar (as measured with zero cut and using an expensive straightedge across both tables. Pressure on the infeed until there is sufficient wood on the outfeed and transfer the downward pressure to the outfeed.

    I marked the length of the edge with chalk so I would know when the entire edge was jointed. It took many passes at 1/32 per pass.

    OK, get ready to laugh.....

    I now have a board that is 6 inches wide at one end and 4 1/2 inches wide at the other end!

    What in heaven's name am I doing wrong?

    Thanks! This just ain't right....

    Warren

  2. #2
    Join Date
    Dec 2006
    Location
    Nova Scotia's beautiful south shore
    Posts
    443
    I'm not sure if I have an accurate picture of your setup, so let me tell you what I think you said.

    You have your infeed and outfeed tables at the same height and your cutter running 1/32 above the height of both tables.

    Am I close?

    I'll wait here
    All the best,
    Ian G

    **Now holding auditions for a catchy new signature**

  3. #3
    Join Date
    Dec 2006
    Location
    Livermore CA (SF Bay Area)
    Posts
    51
    Nope. It isn't surprising that I didn't make myself clear. The outfeed table is even with the knives at tdc. The infeed table is set for 1/32.

    They are only equal when I ran the infeed table up to zero, rotated the knives out of the picture and measured the parallelism of the two tables in relationship to each other.

    That better?

  4. #4
    Join Date
    Dec 2006
    Location
    Nova Scotia's beautiful south shore
    Posts
    443
    Quote Originally Posted by Warren White View Post

    That better?
    Well, yes and no. Your setup sounds fine - at least that that's the way I do it.

    If you got a taper then the problem must be technique. It sounds as if you might have had a hollow (concavity) on the edge. (this would work better with diagrams) Depends on the length of the piece realitive to the jointer also.

    I started to explain what might have happened, but I'll skip to the last scene. If there's a hollow, spot plane the two ends alternately until you get a continuous cut the length of the board. If there's a belly (convexity) spot plane the middle only (or wherever the belly is) until you get a continuous cut the length of the board.

    This requires you to hold the board more or less level as you remove either the ends or the middle, as needed. Many folks are more comfortable making a board jig for the tablesaw and putting the straight edge on that way.

    I don't know if this helps, or if it's even comprehensible, but it's the best I can come up with.

    Lemme know, but I'm hitting the sack soon, so it'll have to wait til tomorrow. Maybe some else will chime in before then.
    All the best,
    Ian G

    **Now holding auditions for a catchy new signature**

  5. #5
    Join Date
    Dec 2006
    Location
    Livermore CA (SF Bay Area)
    Posts
    51
    Thanks, Ian. That does make sense. I thought that my boards were fairly straight and parallel, but they are redwood that I had resawn and perhaps there was stress internal to the wood that revealed itself as a bow, either concave or convex after the resaw.

    I should have taken more time to study the wood before I started whacking away at it. Patience isn't my strong suit I guess. I just want to start the milling process.

    I am just making a new bird feeder. You would think that it wouldn't be rocket science....

    Thanks again. Have a good night.

    Warren

  6. #6
    Join Date
    Feb 2007
    Location
    FLA .....USA !! (Earth)
    Posts
    29
    Quote Originally Posted by Warren White View Post

    I am just making a new bird feeder. You would think that it wouldn't be rocket science.... You'd be surprised how complex the simplest project REALLY is ....
    I've made some doosies over the last few years !!

    Maybe you're putting uneven pressure on the board as you push it through. ie: pushing down too hard at either the front or rear of the board and not enough at the opposite end ? Smooth even pressure allowing the tool to do the work.Just a thought.
    Elliott
    Last edited by Elliott Cameron; 02-15-2007 at 03:44 AM.

  7. #7
    Join Date
    Jan 2007
    Location
    Lindsay area, Ontario, Canada
    Posts
    30
    Warren...one other point to be sure on. You set the tables parallel, with the knives out of the picture...that's fine. But...after lowering the infeed table... was it still parallel with the outfeed one? It's not guaranteed, to stay parallel, when moved.

  8. #8
    Join Date
    Dec 2006
    Location
    Livermore CA (SF Bay Area)
    Posts
    51
    That is of course a possibility that I hadn't thought of. It should be relatively easy to check however.

    So I did....

    It looks like the end of the outfeed table is about .060 low. It appears you were right on. Now, I will have to re-read the manual (I have a Jet 4" Jointer) and see how that gets fixed.

    Thanks Jim (and all who helped)

    Warren

  9. #9
    Join Date
    Dec 2006
    Location
    Spokane, WA
    Posts
    60
    An easy way to cherck for parallel alignment is shown on this website:

    http://woodworking.homeip.net/wood/T.../Jointers.html
    "A dog teaches a boy fidelity, perseverance, and to turn around three times before lying down."
    Robert Benchley

  10. #10
    Join Date
    Nov 2006
    Location
    Constantine, MI
    Posts
    6,975
    Any chance you are only applying pressure to the tail end of the board through the entire pass over the jointer?

    You should be moving your hands to the outfeed side and pressing down and 'pulling' the board through for at least the second half of the pass. Pressing down and guiding from the infeed side only might cause the board to lift off the outfeed table and take a heavier bite on the second half of the pass.

    Sorry if that is not really clear.....it's real early here!
    “We all die. The goal isn't to live forever; the goal is to create something that will.” - Chuck Palahniuk

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