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Spin Fixture for the Surface Grinder

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  • Spin Fixture for the Surface Grinder

    This weekends project, a little spin fixture for OD grinding. I wanted to see if I could make a spindle. It uses 6203-2RS bearings with a spring to preload the balls and minimise runout. The body is a cast iron piston rod end or something.

    Some pictures

    Drew it in solidworks



    Turned a 4" disk from 1/2" plate


    Indicated off the reference bore I made with the intention to matching my 4" rotab from Little Machine Shop


    Welded in the spindle I made


    Sent from my SM-G930W8 using Tapatalk
    Last edited by mattthegamer463; 06-16-2019, 11:33 PM.

  • #2
    Cut down the cast iron and bore the bearing holes. I machined some flats referenced against the bearing bores and assembled the unit after I faced off the faceplate to correct the alignment errors after welding.

    I clamped the faceplate to an angle block and ground the cast iron flat, made a bottom plate and ground that too.

    Tested it out on a old tool steel shank and it works nicely.

    Sent from my SM-G930W8 using Tapatalk

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    • #3
      It needs some finishing touches. One thing i want to do is case harden the base, and make a V block work holder that many higher end units have. I also need to futz with my hackjob ER32 holder I made last year as it has quite a bit of runout, making it close to useless.


      Sent from my SM-G930W8 using Tapatalk
      Last edited by mattthegamer463; 06-17-2019, 10:55 AM.

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      • #4
        That's some nice work there.

        JL....

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        • #5
          Hire out your welding.

          -D
          DZER

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          • #6
            Cool little fixture.

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            • #7
              Someday I will have you ...…………..
              Someday.

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              • #8
                My brother gave me one of them , it says electrode former, looks the same.

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                • #9
                  Originally posted by KiddZimaHater View Post
                  Someday I will have you ...…………..
                  Someday.
                  I've spent countless hours spinning the handle of one of those. I want one with a motor . I made a tapered plug that fits into the handle, with a 1/4" hex flex shaft on the other end. I can now use my small 12v hex driver to spin it which makes pin grinding so much nicer. But it's not the same as having one on a base plate with a motor attached.

                  Nice work Matt, looks like a pretty useful setup you have there.

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                  • #10
                    Originally posted by Doozer View Post
                    Hire out your welding.

                    -D
                    Thanks Doozer.

                    My flux core welder is a $130 unit that isn't rated for beyond 1/8" and preheating makes the spatter fuse extra hard to everywhere I don't want it, so I just gave it a few squirts and crossed my fingers. Doesn't have to withstand much force, especially in the axial direction so I don't think it will break.

                    I was thinking about how to do a limit-setting feature so I can grind a radius without fear of overshooting, but I didn't come up with something that wasn't way over complicated.

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                    • #11
                      Did some tweaks on my ER32 collet holder and now it is running a lot nicer, I frankly don't know what was going on in my head when I made it as there was like .01" face runout when mounted on a dowel pin in the 4 jaw. Did a similar process to get it tuned in around .001" on the spin fixture so its going to live there for the time being.

                      Sent from my SM-G960W using Tapatalk

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                      • #12
                        Nice work.
                        Added to my list

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                        • #13
                          Originally posted by mattthegamer463 View Post
                          Thanks Doozer.


                          .
                          Just could have made it a .003" press fit and forget the welding.

                          -D
                          DZER

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                          • #14
                            Originally posted by Doozer View Post
                            Just could have made it a .003" press fit and forget the welding.

                            -D
                            If it don't fit in my bench vise, it don't get pressed

                            Sent from my SM-G960W using Tapatalk

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                            • #15
                              Originally posted by Doozer View Post
                              Just could have made it a .003" press fit and forget the welding.

                              -D
                              .003 would be a lot of press for a shaft that size.
                              OPEN EYES, OPEN EARS, OPEN MIND

                              THINK HARDER

                              BETTER TO HAVE TOOLS YOU DON'T NEED THAN TO NEED TOOLS YOU DON'T HAVE

                              MY NAME IS BRIAN AND I AM A TOOLOHOLIC

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