Announcement

Collapse
No announcement yet.

R8 Index

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

  • R8 Index

    Why does no one sell a R8 spin index? I have a set of R8 collets why should I have to buy a set of 5C collets when the R8 collets would work for most of what I would use an index for. I decided to build my own. I took great pains with the setup and cutting the R8 taper. I almost peed myself when I dialed a piece of 1/2" stock in it and could not detect any runout.
    It's not complete yet I still need to make a washer and draw bar for it and figure out how to attach the indexing plates and pin that I still need to make. I would like to make a 90:1 worm gear to mount on it and the necessary indexing plates.

    Terry



    Last edited by terry_g; 01-04-2010, 06:24 PM.

  • #2
    Because the R8 collets only go up to 7/8" diameter work and the work will not pass all the way through the collet. 5C collets are drawn in with a hollow drawbar allowing the work to extend past the end of the collet.
    Last edited by Carld; 01-01-2010, 08:29 PM.
    It's only ink and paper

    Comment


    • #3
      5-c

      Another advantage to the 5-C is you can work with a longer work piece. The R-8 has a draw bar that prevents you from spinning a longer work piece. The 5-C uses a lock collar that allows your work piece to go threw the collet.
      Visit my site for machinist videos free charts & more

      Machinist Classifieds Free Listing

      Comment


      • #4
        Still, a dang nice effort in making something that can still be very useful.

        Comment


        • #5
          R8's also have a very limited size range.
          The shortest distance between two points is a circle of infinite diameter.

          Bluewater Model Engineering Society at https://sites.google.com/site/bluewatermes/

          Southwestern Ontario. Canada

          Comment


          • #6
            Nice work. While R8's might be limited, most of us have them. What you have there can be indispensable when it comes to full use of existing tooling.

            Cheers!
            rock~
            Civil engineers build targets, Mechanical engineers build weapons.

            Comment


            • #7
              Good job

              Originally posted by Ken_Shea
              Still, a dang nice effort in making something that can still be very useful.
              Yes looks like you done a nice job. I can think of a lot of things it could do.
              Make a small face plate for it.
              Make the face plate to hold a small 3" or 4" lathe chuck
              Visit my site for machinist videos free charts & more

              Machinist Classifieds Free Listing

              Comment


              • #8
                Originally posted by loose nut
                R8's also have a very limited size range.
                While that is true, I have seen a number of full 5C collet sets that peopled have, guess how many never get used
                , guess again on the ones that do

                With the exception to the 1" it was pretty much the R8 Range.

                Comment


                • #9
                  R8 collets only go to 7/8".

                  I have a full set of R8 collets and I only use about 8 of the sizes most the time. I also have an almost complete set of 5C collets, I think I am missing 6 of them. I seldom use the 5C's.

                  I think the tool Terry made is a good idea and most the time when your using a spin index you seldom have a long piece in it. It could be handy to have.
                  It's only ink and paper

                  Comment


                  • #10
                    "With the exception to the 1" it was pretty much the R8 Range."

                    That is what that was referring to Carl.

                    Comment


                    • #11
                      oh 'scuse me.
                      It's only ink and paper

                      Comment


                      • #12
                        Originally posted by Carld
                        oh 'scuse me.
                        Well OK, but just this once

                        Comment


                        • #13
                          Actualy can't you get 1" R8 collets? they are just so thin its not even funny.
                          Play Brutal Nature, Black Moons free to play highly realistic voxel sandbox game.

                          Comment


                          • #14
                            You can get thin wall 7/8" R-8 collets. The 1" R-8 collet is a joke that made it into production in China.

                            R-8 is a tool holding collet.
                            5C is a work holding collet.

                            --Doozer
                            DZER

                            Comment


                            • #15
                              my collet set came with a 1" collet. No way in hell could I cut with a 1" EM in it tho. The cutter just kept falling out. The 7/8" wasn't much better
                              Ernie (VE7ERN)

                              May the wind be always at your back

                              Comment

                              Working...
                              X