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Question regarding accessory ID and drill bit sharpening please?

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  • Question regarding accessory ID and drill bit sharpening please?

    I'm including a photo of an accessory that I purchased many years ago as part of a center pair. The other half of the pair is a fixed center with a spring loaded point. This half of the pair is obviously not fixed so I'm wondering what it is called in the tool and cutter sharpening world and what the uses of it are other than half of a pair of centers.
    As shown, I've been trying to adapt a collet holder to it for sharpening drill bits. This setup is missing an ingredient in that the lip of the drill doesn't stay perpendicular to the grinding wheel as it is swung up. I suspect there needs to be a method included that rotates the holder in a manner that allows the lip of the drill bit to stay perpendicular?
    Any help is greatly appreciated.
    Thanks Click image for larger version  Name:	IMG_20200613_101800.jpg Views:	0 Size:	4.51 MB ID:	1880991

  • #2
    Bump?
    I was able to figure out that the unit in question is called a universal headstock. I don't know what the applications are for it and I don't know if I can successfully use it for a drill bit sharpening fixture?

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    • #3
      KO Lee or other part# on it? You need some sort of adjustable tooth rest as you would with an end mill sharpener to index the cutting edge.
      To me it look more like a sharpening setup for large boring bars.
      Take a look at this link, you might get some ideas/
      https://www.sterlingmachinery.com/me...r-brochure.pdf
      Last edited by reggie_obe; 06-14-2020, 04:48 PM.

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      • #4
        Originally posted by reggie_obe View Post
        KO Lee or other part# on it? You need some sort of adjustable tooth rest as you would with an end mill sharpener to index the cutting edge.
        To me it look more like a sharpening setup for large boring bars.
        Take a look at this link, you might get some ideas/
        https://www.sterlingmachinery.com/me...r-brochure.pdf
        That one isn't made by KO Lee but they made one similar to that which was called a universal tail stock or center.

        JL................

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        • #5
          I am not sure about exactly what uses that head may have been sold for. But from just looking at the photo, I doubt that it was intended to rotate a drill bit in any direction to produce the common drill tip geometry that I call a modified cone. The devices that do produce this drill tip geometry usually use either an angled axis to rotate the bit or some kind of cam.

          However, you may be able to do some excellent drill bit sharpening by using it. That modified cone geometry is only one of many drill bit geometries that have been used. There are several types of geometry that use flat facets instead. There are two, four, and six facet grinds. Also there is the popular split point geometry which can be used with either the two or four facet basic grinds.

          There are many internet and book sources on these various methods of sharpening drill bits and if you are interested in making a sharpening system for your shop I suggest that you read up.
          Last edited by Paul Alciatore; 06-14-2020, 11:15 PM.
          Paul A.
          SE Texas

          And if you look REAL close at an analog signal,
          You will find that it has discrete steps.

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          • #6
            Can you shoot a pic of that part just as you bought it, along with the other part? The one you show looks more like a basic tool holder, like the tap holder shown on this page: http://www.lathes.co.uk/kolee-page4/ or the workhead shown in the Cincinnati PDF, except it doesn't have a big enough bore to house a spindle bearing.

            EDIT: OK, I think I understand now. The separate part in front is the center spindle for the attachment. I see an item like that in this pic:
            https://www.normanmachinetool.com/pr...utter-grinder/

            Looks like it's for holding a long cutter at a slight angle for side sharpening (think of a tapered reamer) or end relief. The K.O. Lee table rotates slightly to do this, so I think this is why the original K.O. Lee literature doesn't show such an attachment, but the Cincinnati one does.
            Last edited by AntonLargiader; 06-15-2020, 08:00 AM.

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            • #7
              Originally posted by AntonLargiader View Post
              Can you shoot a pic of that part just as you bought it, along with the other part? The one you show looks more like a basic tool holder, like the tap holder shown on this page: http://www.lathes.co.uk/kolee-page4/ or the workhead shown in the Cincinnati PDF, except it doesn't have a big enough bore to house a spindle bearing.
              I will do that.
              As shown I get a good, sharp grind ONLY at the lip of the bit. Once I swing the bit up it's the lip is no longer perpendicular to the wheel. I suppose I need a method that will keep the bit perpendicular as I swing it up.

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              • #8
                Here is the other half of the pair of centers. There are no manufacturer marks etc. I do find it interesting that the clamp and the piece of steel that fits into the slot of the table are precise fits for this table. I'm almost certain I purchased these because they fit this machine. Click image for larger version

Name:	IMG_20200615_131244.jpg
Views:	129
Size:	4.84 MB
ID:	1881464Click image for larger version

Name:	IMG_20200615_131252.jpg
Views:	127
Size:	4.87 MB
ID:	1881465

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                • #9
                  Interesting. They don't match at all, stylistically, but they have the same height, offset, and setscrew configuration.

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                  • #10
                    Originally posted by AntonLargiader View Post
                    Interesting. They don't match at all, stylistically, but they have the same height, offset, and setscrew configuration.
                    They match. I just repainted one. They are Def a pair.

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                    • #11
                      When working at a grind shop, we used this setup to grind push and pull brouches can also open end brouches. The grind wheel comes in from the side for this. Think open and box end wrenches.

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                      • #12
                        It's shown in manuals for both the A600 and B600 series grinders; it seems to be an original K.O. Lee B620 Universal Headstock.

                        https://www.scribd.com/document/7308...-A600-Brochure
                        http://vintagemachinery.org/pubs/1738/3777.pdf
                        http://vintagemachinery.org/pubs/1738/6579.pdf

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