Jigsaw not cutting straight

Discussion in 'Boatbuilding' started by mariobrothers88, Oct 29, 2020.

  1. mariobrothers88
    Joined: Sep 2020
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    Location: San Diego, CA

    mariobrothers88 Junior Member

    Hi guys, I am running into a weird problem with my Bauer jigsaw. I am using a metal fence to make an accurate cut, but my cuts are off by 2 mm. Am I doing something wrong or is the jigsaw just defective and needs to be replaced? I tried changing the blade and I still have the same problem. You can see in the photo where I start the cut, it's about 20mm from the metal fence, and when I end the cut, it's about 18mm from the metal fence which means it was 2mm off (deviated towards the fence). Any suggestions would be greatly appreciated!

    Both blades seems to be perfectly square and they don't seem to be bent at all.

    I don't have a lot of experience with jigsaws so maybe I am doing something wrong. I try not to put any pressure on the jigsaw as I move it, just slight forward pressure and I try to keep the jigsaw flat against the wood.
     

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  2. mariobrothers88
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    mariobrothers88 Junior Member

    Actually so sorry for the confusion, (the ruler is backwards), when I started the cut it was 36mm (not 20mm) from the fence, and when I ended the cut it was 34 mm (not 18mm) from the fence.
     
  3. Mr Efficiency
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    Mr Efficiency Senior Member

    Your typical jigsaw can go awry on thicker materials. the blade being somewhat flexible. A circular saw might do better, and quicker.
     
  4. Blueknarr
    Joined: Aug 2017
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    Location: Colorado

    Blueknarr Senior Member

    Jig saws are designed to not cut straight.
    Is the fence sliding?
    Are you applying any side force?
    Is the saw's foot parallel to the blade?
    Is the saw set for argessive cut (the blade osulating forward and backwards as well as up and down)?
    Are you applying forward force?

    Try free hand with little forward aggression or force (GO SLOW).
     
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  5. Rumars
    Joined: Mar 2013
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    Rumars Senior Member

    Just to make sure, clamp the fence at both ends and crank down on the clamps, often users push hard to one side to be sure to follow the fence. Go slow and let the tool do the job, don't push hard. And don't expect a perfect parallel cut, it's not a tablesaw.
     
  6. mariobrothers88
    Joined: Sep 2020
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    Location: San Diego, CA

    mariobrothers88 Junior Member

    Thanks everyone for all the tips. I clamped down both ends of the fence pretty hard. I put very slight forward pressure and pressure against the fence, otherwise I let the saw do the work and I go very slow. I think because the blade has some wiggle room on the blade roller guide it allows the blade to bend very slightly. I'm just wondering if this is typical of all jig saws or should I try returning it for a different brand like a dewalt or would I just have similar issues? I bought the Bauer jigsaw from harbor freight and it had great reviews.
     
  7. Blueknarr
    Joined: Aug 2017
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    Blueknarr Senior Member

    It is typical of most jigsaws. They're designed for cutting curves. I have a better time freehand than with a guide. Have a blower keep your vision of the line clear. Go slow with the forward/reverse action turned off. The wider the blade the straighter it cuts.
    As with all skills-practice males perfect.
    Compare these to what you usedhttps://www.ereplacementparts.com/jig-saw-blade-p-90715.html
     
  8. Blueknarr
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    Blueknarr Senior Member

    Looking at your third image. It appears that the blade is two or three degrees off of being parallel to the edge of the foot. The blade has to be parallel to the fence for it to work as a guide.

    The vibration of the jigsaw makes it nearly impossible to keep parallel alignment.

    A rotary bit tool will work much better with a fence.
     
  9. Mr Efficiency
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    Mr Efficiency Senior Member

    As has been pointed out, a jigsaw is not designed for straight cutting, simple as that/
     
  10. mariobrothers88
    Joined: Sep 2020
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    mariobrothers88 Junior Member

    Thank you everyone for the replies I really appreciate it! Would a better brand jigsaw like the dewalt or bosch have a better chance of cutting straight? I found this video on youtube of someone being able to cut a long consistent straight line using a fence with a bosch. Anyone have experience with these brands being able to cut straight?

     
  11. BlueBell
    Joined: May 2017
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    Location: Victoria BC Canada

    BlueBell Ahhhhh...

    Don't use a fence with your jig saw, use a skil saw against a fence.
    If you don't have a skil saw, use your jigsaw but without the fence,
    just follow the line by eye. If it still doesn't cut straight I would look at the operator.
    Good luck!
     
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  12. Blueknarr
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    Blueknarr Senior Member

    Fences and jigsaw don't work...period end of story!!

    It takes the better part of an hour to adjust the shoe and blade so they are exactly parallel to each other. Then it only takes a few minutes of cutting to vibrate them out of wack.

    If you want to replace the tool.
    Get a spiral rotary cutter. They work with fences and will cut even tighter curves than a jigsaw.
     
  13. ondarvr
    Joined: Dec 2005
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    ondarvr Senior Member

    I have a Bosch jigsaw, it's a great tool, I don't use it to make straight cuts because I don't like being disappointed.
     
  14. Blueknarr
    Joined: Aug 2017
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    Blueknarr Senior Member

    A couple of observations on the video.

    First the finished cut edges are not shown.
    The actual cutting is not shown
    The final movement of the saw is on its toes not flat on the shoe.

    IMO it's fake.
     

  15. jbo_c
    Joined: Jul 2017
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    Location: Gainesville, GA

    jbo_c Junior Member

    Jigsaw: an electric hand tool used to convert a line drawn with a straight edge into a wandering, jagged cut.
     
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