Announcement

Collapse
No announcement yet.

Chip breakers for plastic

Collapse
X
 
  • Filter
  • Time
  • Show
Clear All
new posts

  • Chip breakers for plastic

    Anyone know how to break the chip when lathe cutting plastics that produce long, stringy chips? The "bird's nesting" is a PITA.

  • #2
    If you can, score the work before putting it on the lathe. Or cut a groove in it.

    Comment


    • #3
      Originally posted by Bruce Griffing
      If you can, score the work before putting it on the lathe. Or cut a groove in it.
      Suggestions for when one is threading, where a longitudinal score or groove would not be desirable?

      Pops

      Comment


      • #4
        vacuum cleaner right behind the cutting tool, suck the swaff up as its made.
        Play Brutal Nature, Black Moons free to play highly realistic voxel sandbox game.

        Comment


        • #5
          Pretty much forget it.

          Depending on the plastic you can get it to chip with enough of a cut and fast feeds. But you really have to be aggressive to do it.

          This is what my lathe looked like after doing a bunch of delrin, this was with about 3/4" off in a pass:


          IMGP6526 by macona, on Flickr

          Comment


          • #6
            What a mess, ya should have taken a more aggressive cut, then you'd only have had half that mess.

            mark

            Comment


            • #7
              Originally posted by alsinaj
              Anyone know how to break the chip when lathe cutting plastics that produce long, stringy chips? The "bird's nesting" is a PITA.
              You don't. Best you can do is set the right DOC, feed, and chipbreaker to aim the string somewhere convenient.

              Comment


              • #8
                Good lord, is there really a lathe under that mess?!

                At least it's not too painful to clean up. It won't cut you like a razor blade.

                I have never found a way to break the string. I simply try to guide it off to one side of me.

                Comment


                • #9
                  I seem to have solved the string problem when I switched to a CCGX AL H10 insert designed for cutting Aluminum. It didn't break the string but it no longer piled up ahead of the cutter in a big mess. It shot the string off to the right where it landed in a big pile. One time it was shooting over my right shoulder and landing in a pile on the floor beside me so I put the garbage can there. It just shot right into the can.

                  Ernie (VE7ERN)

                  May the wind be always at your back

                  Comment


                  • #10
                    Second the shopvac. Works great.

                    Comment


                    • #11
                      If you can cool the plastic to below its ductile to brittle transition temperature it should form chips rather than stringy crap.

                      Comment


                      • #12
                        Originally posted by beanbag
                        You don't. Best you can do is set the right DOC, feed, and chipbreaker to aim the string somewhere convenient.
                        I always tried to get the swarf to land right in the circular file
                        Forty plus years and I still have ten toes, ten fingers and both eyes. I must be doing something right.

                        Comment


                        • #13
                          Originally posted by bob_s
                          If you can cool the plastic to below its ductile to brittle transition temperature it should form chips rather than stringy crap.
                          May be a bit tricky Bob - the Tg (Glass Transition Temperature) temperature of the (probably) 2 most commonly machined Polymers, are -60degC for Acetal and -90degC for UHMWPE.
                          Nylon by comparison is much easier, as you only have to get that below 50degC.

                          Comment


                          • #14
                            Liquid nitrogen

                            Comment


                            • #15
                              Hello,

                              + 3 on the shop vac. Works great !
                              Toolznthings

                              Comment

                              Working...
                              X