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Poly Abrasive Disc, Flap Disc and Cup Wire Brush

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  • Poly Abrasive Disc, Flap Disc and Cup Wire Brush

    Tried using both today as a bit of an experiment.

    Found the poly abrasive disc (photo here: http://www.mig-welding.co.uk/paint-stripping.htm) to be what others have "raved" about, though, as stated on that site, it does seem to wear quicker the heavier the rusted area. For paint removal and weld prep I could easily see myself moving to just these.

    Flap disc as here: http://www.extremeabrasives.com/flap-discs.php I was less than thrilled with, going strictly by the packaging, yes, it cuts faster but for me the quicker wear/shorter life and the greater cost compared to regular fibre backed discs (used to be typical in autobody shops) is sort of a wash at best. Now it could have been the brand, "Diablo" from Home Depot since for some reason they dropped Norton (?) or it could be the use but I doubt that...

    Anyway, anyone else have a favorite brand or a line that is high value for the dollar; or has found either product suited to a particular function/specialized use?

    Related: just me or are cup style wire brushes to mount on angle grinders disproportionally expensive?

  • #2
    Your application is a bit different than my experience, but I've only used flap abrasive wheels on bench grinders. They cut well, but are expensive, and throw bits of cloth and abrasives all over my workshop. I've gone back to wire wheels .

    Comment


    • #3
      I have used a lot of cheap hand and power wire brushes and find that they mostly do well enough. At one time I was having problems removing rust from a truck bed with a big coarse cup brush on a 7" angle grinder. The brush mostly just polished the hard scale. I broke down and paid something like $60 for a good name brand (which I do not remember) brush. That brush made short work of the rust and I believe it would have cut right through the metal too. So I agree that brushes seem to cost more than they should, but sometimes it is worth it. The good brushes seem to last a lot longer and cut better.
      Don Young

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      • #4
        Hi,

        If you're going to use flap discs, buy 3M. The backing is better and the adhesive is more flexible and stronger, plus they use less of it. So you get far more use out of each disc.

        dalee
        If you think you understand what is going on, you haven't been paying attention.

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        • #5
          I use flap-wheels (3M or equivelent) and slotted and raised grinding wheels (seem to be no longer available - very fast and effective, easy to see where you are working and I have an impression that they were gringing cooler). If I now have to use normal wheels I only use Norton or as supplied from BOC.

          Over-heating and "polishing" (instead of cutting) is a waste of time and causes a lot of inclusions.

          http://i200.photobucket.com/albums/a.../Hyd-lift5.jpg

          http://i200.photobucket.com/albums/a.../Hyd-lift4.jpg

          http://i200.photobucket.com/albums/a.../Hyd-lift3.jpg

          http://i200.photobucket.com/albums/a.../Hyd-lift2.jpg

          Comment


          • #6
            Flap wheels disappoint me greatly, athough my brother says they are awsome, apparently what you need is the sharp edge of some metal, and mash the pad into it to rip off cloth and expose fresh grain.

            Apparently the higher quality flap wheels are worth it too.

            That said, the cup brushs disappoint me too. The non knoted one I tried just threw tines everywhere! and the knoted ones just don't seem all that great either.. Now...


            These suckers... Now these suckers on an angle grinder just kick paints and rusts ass.
            Play Brutal Nature, Black Moons free to play highly realistic voxel sandbox game.

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            • #7
              Thanks, what some of you mention is definitely part of the situation I often find myself in (sort of "polishing" the rust or mill scale) which is part of the reason for trying the "poly discs".

              oldtiffie: interesting, I've seen similar for wood working (at much finer grits) but as far as I know, have never come across one of those "interrupted" discs for metal (and, from what you said, now after the fact...have to dig around in suppliers back/old storage)

              Comment


              • #8
                For removing paint quickly try this product from 3M:
                http://www.drillspot.com/products/62...1_bristle_disc

                Comment


                • #9
                  The Scotch-brite disks are also good in many applications. The 2” size on a right angle air grinder is great for finer details and corners. The 4 1/2" work well on rust.
                  Quality wire brushes are definitely worth the added expense. A big cup wire brush on a 7” grinder is aggressive but it will eat your lunch if you get careless. Ask me how I know.
                  Byron Boucher
                  Burnet, TX

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                  • #10
                    I am pretty sure there is an attachment for oxy-acet for paint removal that works pretty well.

                    The big problem with "discs" and "brushes" is that you can't be sure there are no inclusions left in the parent metal. This particularly applies to large/flat areas where the disk "rubs" rather than "edges" where the disc "cuts". All ground faces should be treated with phosphoric acid primer.

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                    • #11
                      Did you find a source for these things in Canada? I have seen people rave about them and the closest I could find was the 3M electric drill mounted version, not the angle grinder one.

                      Thanks,



                      Originally posted by RussZHC
                      Tried using both today as a bit of an experiment.

                      Found the poly abrasive disc (photo here: http://www.mig-welding.co.uk/paint-stripping.htm) to be what others have "raved" about, though, as stated on that site, it does seem to wear quicker the heavier the rusted area. For paint removal and weld prep I could easily see myself moving to just these.

                      Flap disc as here: http://www.extremeabrasives.com/flap-discs.php I was less than thrilled with, going strictly by the packaging, yes, it cuts faster but for me the quicker wear/shorter life and the greater cost compared to regular fibre backed discs (used to be typical in autobody shops) is sort of a wash at best. Now it could have been the brand, "Diablo" from Home Depot since for some reason they dropped Norton (?) or it could be the use but I doubt that...

                      Anyway, anyone else have a favorite brand or a line that is high value for the dollar; or has found either product suited to a particular function/specialized use?

                      Related: just me or are cup style wire brushes to mount on angle grinders disproportionally expensive?

                      Comment


                      • #12
                        I have found there is a world of difference in good quality flap discs and the cheaper brands, this is true of both longevity and overall usefulness : of course the same is true of grinding discs and wire wheels.

                        For prepping pipe for welding, I much prefer the flap discs, for years grinding discs were the only thing available, but now one has the choice. Of course for grinding roots etc. a disc is still necessary, but the prep work is much better with the flap discs. There is another advantage to using these in that they tend not throw sparks all over the area, from a safety standpoint they are better than discs as well.

                        ymmv

                        rollin'

                        Comment


                        • #13
                          I have the similar experience: the expensive zirconia flap discs remove metal like crazy, but even the best ones glaze over quickly.

                          I use a grinding disc to remove weld beads, and then blend it with a flap wheel -- leaves a beautiful finish and will last a long time if you're not hogging with it.

                          To remove mill- or fire scale, I use the pool PH increase powder. It strips the scale off in about 4 hours. It fumes after you mix it -- do it outside.
                          "Twenty years from now you will be more disappointed by the things that you didn't do than by the ones you did."

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                          • #14
                            Originally posted by RussZHC
                            Found the poly abrasive disc to be what others have "raved" about,

                            Anyway, anyone else have a favorite brand or a line that is high
                            value for the dollar; or found either product suited to a particular
                            function/specialized use?
                            I have good success with 3m's Clean & Strip High Performance disks: a
                            product similar in appearance, but configured as a 4" wheel mounted on
                            an arbor and driven by a die grinder.

                            Purchased for another use, this really shines at cutting through mill scale
                            on steel tubing. Its principal drawback is that it is one item that is not
                            sold through Greggs, my local 'goto' source for industrial supplies. Acklands
                            -Grainger stocks them locally but their counter staff are maddening to deal
                            with.

                            Norton has some products of this sort that I intend to look into. Something
                            to mount on an angle grinder would be a help, too.

                            Originally posted by RussZHC
                            Related: just me or are cup style wire brushes to mount on angle
                            grinders disproportionally expensive?
                            I use a couple of imports and feel that $10 for a 3" knotted cup is not
                            unreasonable. For safety sake and brush longevity, it is important to use
                            a wheel rated for the free speed of the tool.

                            A brush works well for me at removing rust, but, like RussZHC mentions, I
                            find it just polishes mill scale. The 3M Clean & Strip cuts through scale to
                            bright metal in no time.

                            .

                            Comment


                            • #15
                              Originally posted by EddyCurr
                              Norton has some products of this sort that I intend to look into. Something
                              to mount on an angle grinder would be a help, too.
                              Here is a link to Norton's Bear-Tex line of non-woven Strip/Prep/Finish depressed
                              center wheels
                              for angle grinders.

                              .

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