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No, I didn't steal this from Hoffman!

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  • No, I didn't steal this from Hoffman!

    I was at the steel/salvage yard today buying steel and found this laying in the dirt. It's been a while since I've found anything good there but this looks promising.

    Anyone know the maker? It's an 4-way off-set index--Probably from a grinder. It looks like it would mount to the lathe cross slide too. The tool holder portion looks about 3/4". It cost me all of $2.60.








  • #2
    It is a radius dresser is what it is. They are used to form grinding wheels to grind complex shapes. They are pricey in the natural de-rusted condition.

    http://www.harigmfg.com/trudex.html

    Harig is one manufacturer.
    Jim H.

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    • #3
      Thanks JC. This is where it is, as we speak.

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      • #4
        hopefully there is something attached to the anode when you are done
        .

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        • #5
          Cook all that rust off and have fun! Looks like there might be a usefull tool in there. All that fun for $2.60, coooool.
          Civil engineers build targets, Mechanical engineers build weapons.

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          • #6
            what do you use to cook the rust off? and could you give me what volts and how long? Maybe some after pictures? thank you

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            • #7
              Great find.
              I hope you were able to take it apart first and separate the non-ferrous metal. If you don't I think it will become the sacrificial anode and the handle will disappear fast.

              I can't wait to see it restored. I need one of those.

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              • #8
                My thought's too, I hope you removed the (looks like) aluminum handles.

                ------------------
                Doug
                Doug

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                • #9
                  Well, I found out it's a Threadwell Tangi-Matic. There's one on eBay now for $700+. Or if you were lucky, you got the one that just sold for $64. Seems like a wide range of values. For $64, I'll keep it. It looks like I may be able to mount it to my polisher or lathe and use it for a radius attachment. It should be able to take light cuts. The base is removeable so that opens options for various base plates.

                  You scared me SJ so I had to run out to the barn and check it. Every thing is ok. I made the mix a little weak so I hope it's still there in the morning. I just hope there's no copper anywhere.

                  The method should be attacking only the FeO. (And any copper.)

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                  • #10
                    timz1999,

                    See this thread:

                    http://bbs.homeshopmachinist.net//Fo...ML/013558.html
                    Free software for calculating bolt circles and similar: Click Here

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                    • #11
                      Great find Ken. Can't wait to see it cleaned up!
                      Techno-Anarchist

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                      • #12
                        <font face="Verdana, Arial" size="2">Originally posted by Evan:
                        timz1999,

                        See this thread:

                        http://bbs.homeshopmachinist.net//Fo...ML/013558.html
                        </font>
                        Evan
                        thank you that was what i was looking for. I will have to give it a shot with some of my rust!

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                        • #13
                          <font face="Verdana, Arial" size="2">Originally posted by CCWKen:

                          You scared me SJ so I had to run out to the barn and check it. Every thing is ok. I made the mix a little weak so I hope it's still there in the morning. I just hope there's no copper anywhere.

                          </font>
                          Ken,

                          it doesn't matter how strong you make it, the reaction is basically self-limiting. once the rust is gone, it stops. i tossed the exhaust/intake manifold for my old Farmall F-14 in my tank over the summer. i left it in for at least a week, and yes, it was bubbling away every day. i was CERTAIN when i pulled the electrodes out that all that would be left was the chain holding the part. let me tell you, i was amazed at how well it cleaned the manifold up! all the rust was gone and there was still a LOT of cast iron left.


                          andy b.
                          The danger is not that computers will come to think like men - but that men will come to think like computers. - some guy on another forum not dedicated to machining

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                          • #14
                            Thanks for reminding me to make a visit to my local scrapyard,haven't been in months They may not even recognize me anymore
                            I just need one more tool,just one!

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                            • #15
                              Just a quick report:

                              I didn't get a chance to work on it yesterday and only a little today. No pictures yet but WOW! The thing looks brand NEW! Some rubbing and buffing is all it took to restore the grey iron to near perfection.

                              It came appart with no problems--No broken or stripped screws. The only bad thing I found was that someone had tightened the up/down lock too tight and broke out a small section of one side of a channel. I think I can weld or braze it then recut the channel.

                              The process did NOT affect the aluminum or brass parts. The only thing it did was coat them with black iron. (same as everything else) It wiped off easily. The aluminum wheels in the back and the brass index rules polished up with a run over the buffing wheel. The brass bushings weren't affected either.

                              I'll get some pics tomorrow and post them.

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