Metal Circular Saw Blade – Damaged Teeth

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Metal Circular Saw Blade – Damaged Teeth

Home Forums Manual machine tools Metal Circular Saw Blade – Damaged Teeth

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  • #770077
    Robert Bowen-Cattry
    Participant
      @robertbowen-cattry70600

      Good morning all,

      I was recently gifted a very nice Dewalt chop saw which came with a metal cutting blade. Unfortunately some of the teeth (which I assume are carbide) were chipped when the previous owner used it to cut stainless steel.

      Are these blades repairable (is it even worth it) or should I bite the bullet and buy a new one?

      Many thanks,

       

      B

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      #770078
      JasonB
      Moderator
        @jasonb

        Most saw doctors can braze on replacement tips but at about £5 each it may just be better to get a new blade if too many need replacing as you will also have to pat 25-30p per tooth sharpening.

        #770084
        noel shelley
        Participant
          @noelshelley55608

          I would just get a new one the cost of repair and sharpening will not worth it. When using a chop saw bring the blade down slowly to start the cut and feed slowly, DO NOT force the blade, allow it to cut at it’s own speed. De Walt, Was the machine intended to cut steel, or just aluminium and wood ? Good luck. Noel.

          #770085
          Chris Gunn
          Participant
            @chrisgunn36534

            Robert, a lot depends on what you intend to saw, If you are sawing angles and box sections the wide spacing of the tips leads to breakage. I have a cold saw using an HSS blade, with finer tooth pitch, and this can cope with most sections.

            #770089
            Andy Stopford
            Participant
              @andystopford50521

              The Evolution blades are pretty good – they’ll cut metal and wood (they last well with MDF too).

              They’ll cut quite heavy steel sections, but I’ve also used them to mitre cut extremely thin walled steel tube for curtain poles, which is difficult to cut with any other sort of saw because it kinks so easily.

              #770108
              Robert Bowen-Cattry
              Participant
                @robertbowen-cattry70600

                Thanks chaps. 🙂

                It also came with an abrasive disk which I have been using for now, and will get a new metal blade at some point.

                 

                #770117
                Nigel Graham 2
                Participant
                  @nigelgraham2

                  Andy –

                  It might help to hold such tubes in a simple split wooden clamp (like a split journal), but such material is always awkward, and an abrasive cutting disc might be the better tool.

                  #770118
                  Andy Stopford
                  Participant
                    @andystopford50521
                    On Nigel Graham 2 Said:

                    Andy –

                    It might help to hold such tubes in a simple split wooden clamp (like a split journal), but such material is always awkward, and an abrasive cutting disc might be the better tool.

                    I needed to cut precise mitres to fit the them in bay windows and I don’t have one of those mitre stands for my angle grinder (the thin cutting discs do a good job of cutting these tubes, but there’s no way you can do it accurately freehand).

                    #770139
                    DC31k
                    Participant
                      @dc31k
                      On Robert Bowen-Cattry Said:

                      It also came with an abrasive disk which I have been using for now

                      Please post the model number. There is no saw made by DeWalt or anyone else that is suitable for both a toothed blade and an abrasive disk.

                      If it turns out that the toothed blade was being used incorrectly, that might save you wasting money on a replacement.

                      #770140
                      Pete Rimmer
                      Participant
                        @peterimmer30576

                        We use a Makita cold cut circular saw at work it eats metal but when the blades go off they go off quickly, the teeth break up and the blade is scrap. They aren’t too expensive though and can do a fair bit of work before they need replacing.

                        The teeth are not sharpened dead flat on the face so I would say that even if your saw has only slightly dulled teeth then sharpening is going to be of limited value. If teeth are broken it needs sending to the bin.

                        #770150
                        Fulmen
                        Participant
                          @fulmen

                          I’ve had carbide saw blades resharpened. Didn’t pay for it myself (a friend tossed them in with other tools) so I don’t know how much it cost. But he never complained about the price so I guess it wasn’t that bad. 2 out of 3 could be saved, I even think they brazed in a few teeth. The one that had to be scrapped was due to wobble.

                          #770154
                          JasonB
                          Moderator
                            @jasonb

                            No need to send it to the bin if a tooth or two is missing. Being a woodworker I’ve sent dozens of such blades to the saw doctors over the years and they come back with the missing teeth replaced and the whole lot sharpened. Can usually get 3-4 uses out of a site blade but only 2 or three out of table saw blades depending on the grind be they straight across flat top rip blades or high tip angle finishing blades.

                            The talk of HSS cold cut blades is fine but the saws they are meant for run slower than the ones that take TCT blades so don’t mix them up as just like a slitting saw you will soon blunt an HSS one if run too fast.

                            #770159
                            Fulmen
                            Participant
                              @fulmen

                              Yeah, you can’t go mixing blades like that. IIRC the blades I used had a cutting speed of 1200m/min! That’s insane compared to what I usually do in the mill or lathe, and I wouldn’t subject HSS to that even in wood.

                              #770160
                              JasonB
                              Moderator
                                @jasonb

                                Yep, 10″ coldcut may run at about 50rpm, My 250mm Dewalt SCMS is 4300rpm

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