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  1. #1
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    Default Carbatec CTJ-381X thicknesser blade misalignment

    Hi Woodies.
    I have a Carbatec CTJ-381X thicknesser that I purchased in 2010 along with a full set of replacement blades. I have been very happy with the planing finish obtained with this machine and the longevity of the blades. I have recently undertaken my first full blade change and am not completely happy with the results. The timber is left with visible cutting lines that need to be sanded out after thicknessing. I have studied the blades more closely and found that there is a slight rotation of the blades as they are tightened on the cutter head. This causes one corner of the blade to be slightly forward of the other which would also result in it cutting slightly deeper.
    Has anybody out there experienced a similar problem and found a way to overcome it? At this stage the only solution I have come up with is to wedge the blade somehow while tightening the retaining bolt and using a straight edge to check the final alignment across several blades on the head. This is a very tedious process given that there are 72 blades.

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  3. #2
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    Default

    Don't the inserts register solidly against a raised edge to prevent them from turning? Is the surface below the inserts really clean with no build up that would stop the insert pulling down flat against it? Is the underside of the screw head in good condition with no gouges or score marks?
    Does your head look like this one from the later models?

    Cutter head.JPG
    Dallas

  4. #3
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    Default

    I don't have your model thicknesser but I do have the Carbatec helical head 8" jointer and lunchbox spiral head thicknesser. I found that some cutters had gunk buildup around them that wasn't an issue until I loosened their holding screws, the gunk prevented good registration against the index on the head. The issue was similar to what you describe, where tightening the screw down meant the cutter edge was slightly skew compared to the index. Cleaning off the build up allowed the cutter to register properly.

    If you're still having issues and there is no build up, I'd say your cutters might be the problem. Did you have any issues when you turned to a new edge in the past?

  5. #4
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    Default

    This was my method of insert rotation, worked perfectly for thousands of rotations:

    Loosen the screw enough for the insert to freely rotate
    Blow out the seat with compressed air
    Visually inspect the seat for any resin that's stuck on and remove it
    When retightening the screw, hold the insert down and away from the rear seating edge; this ensures that it is seated flat at the bottom and allows the screw to pull it back to the correct position

  6. #5
    Join Date
    Jul 2011
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    Berowra Waters
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    Default

    Blow out with air
    check for resin build up.

  7. #6
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    Jul 2014
    Location
    Brisbane
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    Default

    Just came across this video from SJE with something that sounds very similar to your problem TassieRob - Accu-head Insert Screws - YouTube

    Apparently worn screws can cause an issue with the cutters being skewed too.

  8. #7
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    Feb 2021
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    Default

    Quote Originally Posted by Treecycle View Post
    Don't the inserts register solidly against a raised edge to prevent them from turning? Is the surface below the inserts really clean with no build up that would stop the insert pulling down flat against it? Is the underside of the screw head in good condition with no gouges or score marks?
    Does your head look like this one from the later models?

    Cutter head.JPG
    Thanks for your thoughts Treecycle. I have been cleaning the surfaces to ensure no grit or buildup. The head does look like the picture. I have checked the size of the old inserts compared to the spares that I have installed. There is a 0.12mm difference in the size with the spares being the slightly smaller size. This allows a small amount of movement. I have been able to minimise movement of the inserts as I tighten them by using a feeler gauge between the recess and the insert. I have used a straight edge across the face of each row of inserts to get them in line. I haven't checked the screws closely for wear or poor manufacture but will do this and let you know.

  9. #8
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    Default

    Tried this but didn't improve the installation. Thanks for your suggestions.

  10. #9
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    Oct 2008
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    Did you get your replacement inserts from Carbatec or from a third party?

  11. #10
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    Default

    Quote Originally Posted by Treecycle View Post
    Did you get your replacement inserts from Carbatec or from a third party?
    I bought a complete set of replacements from Carbatec at the same time as I bought the thicknesser. This was about 10 years ago so I don't think there is much point in trying to make a warranty claim.

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