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  • toolpost grinder

    http://i3.photobucket.com/albums/y59...n/06210001.jpg

  • #2
    ah, first time I've seen an angle grinder used as one, nice.

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    • #3
      It's a grinder on a tool post all right but will it grind and hold finished and close tolerences? Those two essential criteria are determined by the spindle bearings and the motor and drive balance.

      Also I see the lathe has a blanket on it to protect the ways in front of the spindle. What I don't see is the whole machine "tented" in polyethelene with nothing but the work and the grinder exposed to the dust. Grinder dust blows for many feet and lives forever in the works of any machine tool nearby slowly lapping it into uselessness.

      I'm not panning the set-up which is both imaginative and simply wrought. I bet it's a killer ofr drive shaft work where hard welds have to be broken without damaging the yoke fitting. I've used similar set-ups grinding snap-ring grooves in bearing races.

      I strongly urge the newbies NOT to build anything like this with the idea they can use it to precision grind bearing fits etc. This set-up presented in the photos is merely an expedient best applied to penetrating a weld or a hard surface.

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      • #4
        This is almost identical to the setup I used to grind down a hardened hilti bit that ate my carbide for breakfast. Good for rough grinding hard and nasty but definitely no good for precision, It woke me up to the requirement for good bearings when I decide to make a real toolpost grinder.

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        • #5
          Here are a few items that were ground on this grinder as you can see it is a very fine finish. The small ones are expanding arbors the large one is a collet holder (for universal Y collets) the taper is #3 MT this was made for a milling attachment fro the lathe.( still under construction) http://i3.photobucket.com/albums/y59...n/06220002.jpg

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          • #6
            Here is an idea that some of you might find interesting. I have a dumore t/p grinder but I wanted one that was as convenient and fast as changing cutters in my QCTP. I have built grinders using die grinders, and dremel motors but the wheel size is limited so I was going to build a short arbor grinder to fit my tool post. Since I had a Dewalt 5 amp side winder grinder I decided to experiment with it first. I made a tool block for the tool post and fabricated a holder to fit the grinder, I then drilled and counter sunk a hole in the tool block and drilled and tapped a hole in the grinder holder in line with the grinder arbor so that I could swivel the motor to any position. The wheels that I use are 1/4 thickX4 with the nut-a part of the wheel so that you can remove and re-install with out the problem of re true,ing . I grind with the outer circumference. Requirements are as follows wheel must be trued with a diamond and the speed of the motor must be reduced with a dimmer circuit. If these two things are met you should have a very good grinder. Mine grinds as well as the dumore is faster to setup and easier to use.. In trueing the wheel I first chalk it and when the white is gone I am satisfied I leave 4 or 5 thou on the work for grinding, my feed is about .005 untill the last .001 and I finish with .0007 feed ( the slowest on my SB heavy toolroom lathe)
            I am amazed at the finish that can be obtained with this grinder it approaches that of a dowel pin, at any rate I am more than satisfied with its performance. I have encluded 8 pictures, it is a simple holder but if anyone needs more clarification I can break it down and send those pictures. Have fun JPR
            http://i3.photobucket.com/albums/y59...n/06210007.jpg
            http://i3.photobucket.com/albums/y59...n/06210008.jpg
            http://i3.photobucket.com/albums/y59...n/06210006.jpg
            http://i3.photobucket.com/albums/y59...n/06210005.jpg
            http://i3.photobucket.com/albums/y59...n/06210004.jpg
            http://i3.photobucket.com/albums/y59...n/06210003.jpg
            http://i3.photobucket.com/albums/y59...n/06210002.jpg
            http://i3.photobucket.com/albums/y59...n/06210001.jpg

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            • #7
              Do you use a shop vac or some other such device to help suck up the dust? Grinding dust is evil, right up there with rust when it comes to machine tools. It is more evil than rust in that such a small amount is required to ruin things that you can't even see it.

              Make sure to clean the lathe as well as you can. If you get the dust under you carriage, or on any other bearing surfaces, it will destroy the machine in short order.
              James Kilroy

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              • #8
                I do not dress the wheel on this lathe I have a special setup for dressing it in another part of the shop. There is very little grinding dust from this type of wheel I have used magnets to collect the swarf and most all of it is metal. Plus the machine is cleaned after every grinding job and since I am now 72 years young I believe this lathe will outlast me in usefullness

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                • #9
                  With the tool post grinder I made I use a 4" CBN wheel. It produces no visible abrasive dust at all since the wheel hardly wears, only metal from the object being ground. But, I still drape most of the machine.
                  Free software for calculating bolt circles and similar: Click Here

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                  • #10
                    So the bearings in the angle grinder head are good enough for this? When I used mine it seemed that there was too much runout, it was a dewalt as well but has seen alot of hard use, maybe the bearings are too beat up for this application.

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                    • #11
                      this grinder had very little use prior to this usage. I really did not expect to get such good results it was just an experiment to prove out the ease of use of a quick change grinder.Needless to say, but I will not build one since this serves my purposes very well. I forgot to mention in the previous posts but my infeed on the compound is generaly around 1 grad. at 29.5 deg. of the compound figures out to less than a thou infeed. Fitting a bearing with this grinder is a lead pipe cinch JPR

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