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Colbalt milling cutters

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Colbalt milling cutters

Home › Forums › Beginners questions › Colbalt milling cutters

Viewing 5 posts - 1 through 5 (of 5 total)
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  • 21 July 2017 at 11:17 #308102
    Alfie Peacock
    Participant
      @alfiepeacock58331

      I have a X2p mill and when using HSS cutters on steel I know the limits of the machine. I needed to cut some 4 mm slots in steel and used a Cobalt cutter for this, I found that it cut a lot deeper and with a reduced cutting speed than my normal HSS cutters could achieve. Are Cobalt cutters designed for lower speed cutting, as it done a great job on my slots.

      Edited By Alfie Peacock on 21/07/2017 11:18:52

      21 July 2017 at 11:17 #8801
      Alfie Peacock
      Participant
        @alfiepeacock58331
        21 July 2017 at 11:29 #308104
        MW
        Participant
          @mw27036

          Cobalt steel is great but generally more expensive, i'd definitely say it's got a bit more durability than bog standard M40 HSS, they tend to be around 8% cobalt, anything more than that can fall into the category of "crobalt".

          I nicked a big piece of cobalt steel from my old workplace to make cutting tools with and they're still sharp without a regrind. The extra rigidity makes it easier to get nice flat facets when grinding, takes longer but you don't get so much "dappling" when touching up the tool.

          I would assume it'll perform just as well at high speeds as much as low ones. 

          Michael W

           

          Edited By Michael-w on 21/07/2017 11:30:34

          23 July 2017 at 17:05 #308405
          samuel heywood
          Participant
            @samuelheywood23031

            I've only an X1, but an 11.5mm hss end mill i got cheap munches through mild steel just as well,& with as good a finish as the Hssco8 ones i have from same supplier.

            I'd expect no difference in cut quality between hss & "cobalt" cutters from the same manufacturer.

            "Cobalt" are capable of running a bit higher speed than hss,(more resistance to heat)~ at lower speeds there really shouldn't be any difference ?

            "cobalt" are meant to be more wear resistant. I find with drills, cobalt can chip the cutting edge easier, but not noticed the same with endmills/slot drills.

            Not managed to blunt it yet, so can't comment on relative longlivity.dont know

            HSS may be the poor cousin, but more than adequate a lot of the time for us hobbyists.

            23 July 2017 at 17:55 #308413
            Mick Henshall
            Participant
              @mickhenshall99321

              I have a load of the old carbon steel lathe tools need sharpening often but give a good finish, but I do agree hss is my choice

              Mick

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