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Bandsaw not cutting straight

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  • #31
    Originally posted by burninbriar
    The back bearing should adjust in & out. It should bearly touch the blade with no presure. If the new blade wont cut some thing is way out of wack and more than likely tore up the teeth on the first cut.
    The new blade cuts but in order to go through a pipe I would have to apply pressure, its always been like this.

    The got one back bearing to spin without applying pressure but then the other bearing won't spin. So now I adjusted it so if I apply pressure both spin.

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    • #32
      Try backing off the spring pressure on what you were calling the "autofeed".
      that saw should cut straight & true unattended (it's not blazing fast, but it'll cut) if you got all the previously mentioned adjustments right!
      Syncrowave 180 SD
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      1971 Roughneck 1e
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      My own shop since 1981

      Cya Frank

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      • #33
        Originally posted by frank865
        Try backing off the spring pressure on what you were calling the "autofeed"
        For cutting, that has nothing to do with the back bearings correct ?

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        • #34
          Originally posted by tigman47
          For cutting, that has nothing to do with the back bearings correct ?
          If you have the spring too tight, gravity can't feed the blade into the work, & the blade won't have enough down pressure on it to touch the back bearing.
          Syncrowave 180 SD
          MM185 with 3035 Spool gun
          1971 Roughneck 1e
          Stars-n-Stripes BWE
          Optrel Satellite OSE
          ESAB 875 Plasma Torch
          Lincoln 200SA Diesel
          O/A Set
          Century 250A/C-D/C BuzzBox
          1.5 kVA Spot Welder
          Phoenix Electrode Conditioning Oven

          Professional Auto Mechanic since 1974
          My own shop since 1981

          Cya Frank

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          • #35
            if you have to push down, the blade is either dull, too fine or believe it or not, I saw a guy with the same problem, and the blade was in backwards!
            MM-251,30Agun,SD180,TB302,Spectrum625

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            • #36
              Originally posted by mannixnick
              if you have to push down, the blade is either dull, too fine or believe it or not, I saw a guy with the same problem, and the blade was in backwards!
              Yep...That would DEFIANTLY cause a problem!!!
              Syncrowave 180 SD
              MM185 with 3035 Spool gun
              1971 Roughneck 1e
              Stars-n-Stripes BWE
              Optrel Satellite OSE
              ESAB 875 Plasma Torch
              Lincoln 200SA Diesel
              O/A Set
              Century 250A/C-D/C BuzzBox
              1.5 kVA Spot Welder
              Phoenix Electrode Conditioning Oven

              Professional Auto Mechanic since 1974
              My own shop since 1981

              Cya Frank

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              • #37
                Originally posted by mannixnick
                if you have to push down, the blade is either dull, too fine or believe it or not, I saw a guy with the same problem, and the blade was in backwards!
                Blade is in right, blade is brand new and from mcmastercarr.

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                • #38
                  Is it cutting straight when you apply down pressure now?
                  If so did you reduce the spring pressure?
                  How did that work?
                  Syncrowave 180 SD
                  MM185 with 3035 Spool gun
                  1971 Roughneck 1e
                  Stars-n-Stripes BWE
                  Optrel Satellite OSE
                  ESAB 875 Plasma Torch
                  Lincoln 200SA Diesel
                  O/A Set
                  Century 250A/C-D/C BuzzBox
                  1.5 kVA Spot Welder
                  Phoenix Electrode Conditioning Oven

                  Professional Auto Mechanic since 1974
                  My own shop since 1981

                  Cya Frank

                  Comment


                  • #39
                    Did you actually check to see if the teeth are heading in the right dirrection ? If it is inside out they will be backwards. Dont assume that becouse its new its headed the right direction , Its quite common to have to turn a new blade inside out to get the teeth headed right. I've seen a few blades installed backwards before.
                    To all who contribute to this board.
                    My sincere thanks , Pete.

                    Pureox OA
                    Westinghouse 300 amp AC stick
                    Miller Syncrowave 250
                    Hexacon 250 watt solder iron

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                    • #40
                      You might have the problem in the link below. If you have to press down on the saw head and the spring isn't too tight then you have the pivot assembly tightened to much against the plastic bushing on the blade side of the saw. I have a hydraulic cylinder on mine and do not use the spring. It will actually try to cut too fast if the valve is open too much. I have slop in the pivot and if it cuts too fast it will angle the cut like your pictures. I have to set the bleed rate so that it cuts very slow to get a straight cut in square tubing.
                      Without the spring attached and the saw in the horizontal position you can wiggle it back and forth if you have slop in the pivot. When the head is coming down it is running square until the last 1/4" - 1/2" of travel then it moves to the right at least 1/8".

                      http://www.4crawler.com/Machining/in...andsawPivotFix

                      Another site with a different way to fix the slop

                      http://www.frugalmachinist.com/bandsaw.html

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                      • #41
                        Originally posted by burninbriar
                        Did you actually check to see if the teeth are heading in the right dirrection ? If it is inside out they will be backwards. Dont assume that becouse its new its headed the right direction , Its quite common to have to turn a new blade inside out to get the teeth headed right. I've seen a few blades installed backwards before.
                        Yes

                        linngl I actually messed with the bolt that controls the pivot, I actually tighten it then backed off, but I think I crushed the washer to much.

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                        • #42
                          Well the problem got worse

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                          • #43
                            Originally posted by tigman47
                            Well the problem got worse
                            Then you aren't following the suggestions you've been given!
                            Syncrowave 180 SD
                            MM185 with 3035 Spool gun
                            1971 Roughneck 1e
                            Stars-n-Stripes BWE
                            Optrel Satellite OSE
                            ESAB 875 Plasma Torch
                            Lincoln 200SA Diesel
                            O/A Set
                            Century 250A/C-D/C BuzzBox
                            1.5 kVA Spot Welder
                            Phoenix Electrode Conditioning Oven

                            Professional Auto Mechanic since 1974
                            My own shop since 1981

                            Cya Frank

                            Comment


                            • #44
                              Actually I turned the speed down, could this be causing it to be worse ?

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                              • #45
                                Originally posted by tigman47
                                Actually I turned the speed down, could this be causing it to be worse ?
                                There are speed charts on the web. If you are running the blade speed too fast, or too slow, it won't cut as good as it should. But neither should cause a crooked cut! If you will check all the adjustments that have been suggested in this thread, & make the needed adjustments, that saw should cut square.
                                It will never have the speed, & durability of a first-class high-dollar saw, but if it's adjusted correctly & has a good blade, it WILL produce good cuts! Of course, one cut with something out of adjustment can kill a blade & then that blades life is over, it'll never cut straight.

                                So, recheck ALL the adjustments, make sure the blade is in good shape (or, if any adjustments have to be redone, replace the blade with another new one) & that saw will produce square cuts for you!
                                HTH
                                Syncrowave 180 SD
                                MM185 with 3035 Spool gun
                                1971 Roughneck 1e
                                Stars-n-Stripes BWE
                                Optrel Satellite OSE
                                ESAB 875 Plasma Torch
                                Lincoln 200SA Diesel
                                O/A Set
                                Century 250A/C-D/C BuzzBox
                                1.5 kVA Spot Welder
                                Phoenix Electrode Conditioning Oven

                                Professional Auto Mechanic since 1974
                                My own shop since 1981

                                Cya Frank

                                Comment

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