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  • tool post ginders

    Little Machine Shop has two tool post grinders for sale for small lathes, has anyone had any experience with them, will they produce good work? For hobby work I can't justify the cost of an industrial model like a Dumore. Any feed back would be helpful.


    http://littlemachineshop.com/product...1275&category=

    http://littlemachineshop.com/product...1275&category=
    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

  • #2
    The both look like the same one to me! Gary P. Hansen
    In memory of Marine Engineer Paul Miller who gave his life for his country 7-19-2010 Helmand Province, Afghanistan. Freedom is not free, it is paid for with blood.

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    • #3
      Speeds

      Originally posted by garyphansen
      The both look like the same one to me! Gary P. Hansen
      Nope.

      The first has an adjustable speed and the second is fixed speed.

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      • #4
        I have one at home and there is a couple where I work. In the last five years I have used it one time. When you need one it will pay for itself.
        re
        Herm Williams

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        • #5
          Lms Tpg

          Originally posted by loose nut
          Little Machine Shop has two tool post grinders for sale for small lathes, has anyone had any experience with them, will they produce good work? For hobby work I can't justify the cost of an industrial model like a Dumore. Any feed back would be helpful.


          http://littlemachineshop.com/product...1275&category=

          http://littlemachineshop.com/product...1275&category=
          Hi Loosenut.

          Not a bad grinder at all for the money really.

          Get the variable speed one - the first/dearest one.

          I have one.

          You will need an adaptor for the grinder to fit on your cross-slide - the following drawing supplied by LMS might help.
          http://littlemachineshop.com/Project...rMountAssy.pdf

          As usual with most of my Chinese stuff, I had to made a few minor alterations.

          The main problem was the cheek-plates for the grinding wheel.

          I replaced them as the inner one did not locate on the spindle as well as I'd have liked and the outer one was only a loose fit in the grinding wheel bore and did not locate on the inner plate.

          The result was a lot of "out of balance" problems.

          I made new cheek plates. The inner one (10 deg included angle taper) was pressed onto the spindle - the spindle was held against a centre in my lathe head-stock and the cheek plate was pressed on with the quill in my tail-stock to keep everything true and square.

          Once the new cheek plates were fitter, the grinder performed marvelously. I was very pleasantly surprised to see just how smooth it was -especially so as there is no means of balancing the wheel and cheek-plate assembly.

          The spindle speed adjustment is very good and it holds up under load. It is also reversible.

          The small 3-jaw chuck (supplied) can be used for small cutter end-milling or drilling. The chuck ran very true.

          The grinder can foul the tail-stock quill but with care is OK.

          For $US200 it does a very passable job.

          The taper that I put on the inner cheek-plate was good enough to "wring" on as good as a MT adaptor.

          There is a good "Emergency Off" switch as well that works well.

          I pulled mine apart - other than the spindle bearings - just to see how it was made and put together. The multi-vee flexible belt drive is excellent. Getting the belt tension right is OK - not too easy, but as it doesn't have to be done all that often is OK.

          I would make a point of keeping several of each grade of grinding wheels and a driving belt as spares.

          It won't act as internal grinder if the bore to be ground is much under about 3".

          I bought the top of the line "Roxxon" grinder (and wheels etc) from LMS as well for internal grinding.

          http://littlemachineshop.com/product...2891&category=

          They also have a tool-post adaptor for the "Roxxon" but it is easily made but its cheap as well.
          http://littlemachineshop.com/product...2935&category=

          That "Roxxon" grinder is a really class machine. It is not cheap at all - but IMO was well worth the price. The "Roxxon" is accurate, has plenty of speed adjustment and it holds its revs under load. The collets supplied are very good too - but being small are easily lost - so take care. It is the best die-grinder I have ever had.

          IIRC, Paul Allicoterie had several posts regarding using a spare spindle that he had to make either or both of the TPG external/internal grinder/s. They were very well done indeed. Perhaps you might like to PM Paul A for assistance/advice - he knows his stuff. AIR, Paul's spindle was something like this:
          http://littlemachineshop.com/product...2892&category=

          He did it very well and lots cheaper then the "Roxxon". I'd guess that spindle or similar might do for both internal and external grinding if you make a spindle adaptor/extension for internal grinding.

          All of this pre-supposes that only light grinding loads are going to be applied.

          I hope this helps.

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          • #6
            They'd better look the same, both links are the same, exactly.

            Joe

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            • #7
              Oldtiffie, that was exactly the info I was looking for, Thanks.
              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

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