4″ WellSaw power hacksaw

4″ WellSaw power hacksaw

Home Forums General Questions 4″ WellSaw power hacksaw

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  • #125420
    frank brown
    Participant
      @frankbrown22225

      I bought one of these years ago, and have finally got round to installing it. I changed the three phase 1470 RPM motor for a single phase 1470 RPM one. When I run the saw it is cutting very fast 1 1/2 strokes per second. Any one got one that goes this fast ?.

      I foolishly mounted the machine on wheels so it could be "hidden " when not it use and it rattles around alarmingly (+- 1/2"?), also while doing this, if the blade is let down on the hydraulic damper, then the motor started, the blade slowly moves upwards!!!!. So I am in the middle of clamping it down (when in use GRRRR!), but I am nagged by the thought that the direction of motor travel might account for the strange movement, but the crank is symetrical, so I can't see it making any difference to the vibrations. Any thoughts?

      Frank

      #22736
      frank brown
      Participant
        @frankbrown22225
        #125424
        David Jupp
        Participant
          @davidjupp51506

          The blade should lift slightly on the return stroke.

          On my Q+S hacksaw if I drop the blade to just above the work, pause it using the hydraulic damper, then start the motor, the blade starts to lift (I quickly move the damper control to drop the blade on to the work).

          The Q+S has a 2 positions for the damper control (plus fine adjustment).

          There is a correct direction of rotation – on the Q+S this is marked on the crank drive wheel. You can check this as the connecting rod to the blade carrier should pull slightly down on the cutting stroke and push up more noticeably on the return stroke. If rotation is wrong it should be quite easy to spot.

          Connecting rod should be close to parallel to blade on most of cutting stroke – noticeable angled to it for most of return stroke.

          #125449
          Ian S C
          Participant
            @iansc

            The 90 strokes per min is possibly at the top of the speed for steel cutting, but should be ok, 70 or so would give a little less wear on the blade, also takes a little longer on the cut, but that proberbly doen't matter, your not running a production line. I imagine this saw runs an industrial, ie., 12" x !" blade, not a hand hacksaw type. Ian S C

            #125484
            frank brown
            Participant
              @frankbrown22225

              Its getting better!!. On inspection the main crank drivinng pullet had about 30 degrees of slop in its mounting on its shaft. Once this was tightened up ot was a lot quieter, but it still wanted to shuffle across the shed floor. I then screwed a batten to the floor and clamped the M/C to it and it worked better, but not for long as the wood screws worked them selves out of the OSB floor. I then jury rigged a dexion truss, screwed into the bottom of the wall (where there is a 1 1/2" X 3" piece of timber) clamped to the M/C. now its stationary, quiet, and the blade actually descends on the hydraulic damper. This looks like a success so I am now fashioning a decent looking hinged truss that will lay under the M/C with a tapered pin that will drop into a hole in a bracket on the back of the M/C. I wonder how that mechanism will work. The idea of the taper is that it is self aligning and locking.

              I had a look at the angle of the crank during the cutting stroke and if the crank bearing was "sticky" , it would pull the blade downwards, so I think the direction of the motor is OK.

              thanks for the suggestions

              Frank

              #125533
              Ian S C
              Participant
                @iansc

                I think most of these saws, particulary the lighter ones tend to wander around the workshop, unless they are tied down, maybe if you could drop the speed 10rpm or so, might just make the difference. If you are cutting a lot of brass or aluminium, the higher speed is good. Ian S C

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