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Thread: How straight should jointer knives be?

  1. #1
    Join Date
    Feb 2009
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    Whittier, CA, USA
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    512

    How straight should jointer knives be?

    Hello All,

    I took two sets of jointer knives in for sharpening, an 8" and 6". When I took them out of the wrapper to mount them they didn't look quite right.

    The edges are sharp, but more like a micro serrated edge. I put them against my Starrett square blade and they aren't really a perfectly straight edge either.

    Here are some pics of a knife from each set. See the light shining between the edges? They are all about the same level of wonky.






    So is this typical/acceptable? I've never seen new knives so I don't know what to expect.

    Thanks.
    Dan Gonzales
    Whittier, CA, USA
    Dona nobis pacem

  2. #2
    Join Date
    Jan 2007
    Location
    Sacramento, CA
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    1,367
    woah ...

    If that's typical, i would be surprised. That's out quite a way...
    Jason Beam
    Sacramento, CA

  3. #3
    Join Date
    Apr 2007
    Location
    No, not all of SoCal is Los Angeles!
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    9,076
    That's not gonna work for you. Does the shop do jointer knives as a normal thing or were they doing you a "favor"? Let's look at it this way; you are normally trying to set your knives parallel to the table top to within .001" or so.

    Quote from a "How To":

    "Going through all the trouble to set the knives to +/-0.001" or so pays off, the knives stay sharp longer and the finish is noticeably better."

    I'm not feeling that the knife you show will ever give you +/- .001" across it's length ;-(
    Any sufficiently advanced technology is indistinguishable from magic.
    - Arthur C. Clarke

  4. #4
    Join Date
    Feb 2009
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    Whittier, CA, USA
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    Quick responses! Thanks.

    The blades were sharpened at an established saw and grinding business. They pick up and deliver from my local tool emporium (a highly regarded establishment).

    I will be taking the knives back because I know they will make it right.

    Cheers.
    Dan Gonzales
    Whittier, CA, USA
    Dona nobis pacem

  5. #5
    Join Date
    Nov 2006
    Location
    Delton, Michigan
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    17,472
    let us know what they say about it cuz it doesnt look like a good setup to me at all...
    If in Doubt, Build it Stout!
    One hand washes the other!
    Don't put off today till tomorrow!

  6. #6
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    Oct 2006
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    ABQ NM
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    I agree with the others...that sure doesn't look right to me. If the emporium you mentioned is the one I'm thinking of, I'm pretty sure you're correct about them making things right.
    When the going gets weird, the weird turn pro. - Hunter S. Thompson
    When the weird get going, they start their own forum. - Vaughn McMillan

    workingwoods.com

  7. #7
    Join Date
    Apr 2009
    Location
    Remlap,Al
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    87
    i would be finding someone else to sharpen my knives. any "respectable" shop would never let that out the door. my 2cents

  8. #8
    Join Date
    Sep 2007
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    Central (upstate) NY
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    1,457
    Stuff happens. As long as they make it right in a prompt manner I don't know that I'd let a one-off issue determine future business decisions, but I'm an individual - woodworking is not even a self-sufficient hobby for me, much less a livelihood.

  9. #9
    Join Date
    Oct 2006
    Location
    The Heart of Dixie
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    4,268
    Joiner and planner blades are one of the few places that machinist precision is need in my opinion. People setting their fences with dial indicator is so overkill! But when I set up my joiner or planer I do use a dial indicator to set roller hieghts, pressure bar, etc. I set the blade heights within +/-.001", No way would I accept those blades, there is at least that much variation to start with. Your will have a hard time ever setting those right.

    As for the shop, I would give them a second chance if they have a good reputation. Lots of things could have happened. The machine may have a problem and no had noticed yet. New employee that doesn't know how to set it up right. Lots of possibilities.

    If they came back that way again, I would be looking for someone new.
    God grant me the senility to forget the people I never liked anyway,
    the good fortune to run into the ones I do,
    and the eyesight to tell the difference.


    Kudzu Craft Lightweight Skin on frame Kayaks.
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  10. #10
    Join Date
    Dec 2006
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    RETIRED(!) in Austintown, Ohio
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    Quote Originally Posted by Dan Gonzales View Post
    Quick responses! Thanks.

    The blades were sharpened at an established saw and grinding business. They pick up and deliver from my local tool emporium (a highly regarded establishment).

    I will be taking the knives back because I know they will make it right.

    Cheers.
    Since you're in Whittier, I'm guessing you mean Battels. If so, I can't imagine them not making it right. Thay're a great place to deal with. I was there often when I lived in SoCal.

    My guess is that the sharpening service had a new, inexperienced operator on the grinder that day. Hopefully, by now he's seen the error of his ways...
    Jim D.
    Adapt, Improvise, Overcome!

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