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Tapping/Re-threading service required in Adelaide

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  • Tapping/Re-threading service required in Adelaide

    Hi apologies if this is in the wrong category but wasn’t sure where to place it.

    I am currently restoring an old coffee machine. A couple of the bolts were badly rusted and snapped when trying to unscrew. I need 2 holes drilled & re-threaded where the old bolds are stuck in the thread. I have a tap & die set but really don’t want to risk doing a second-rate job of it.

    Can anyone recommend an honest machinist/metal engineering workshop in Adelaide that would do a small job like this?

  • #2
    Re: Tapping/Re-threading service required in Adelaide

    Can you drill into them and get one of those tools to get it out? That would be the ideal thing to do or is the female part of the thread knackered?

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    • #3
      Re: Tapping/Re-threading service required in Adelaide

      Originally posted by 4C7375726F685944697F6A63060 link=1302052758/1#1 date=1302066886
      Can you drill into them and get one of those tools to get it out?  That would be the ideal thing to do or is the female part of the thread knackered?
      Called an "easy out" and BE careful. Ya break one of these and you in the poo poo.

      Originally posted by 6C6D67746A6F75060 link=1302052758/0#0 date=1302052758
      I need 2 holes drilled & re-threaded where the old bolds are stuck in the thread. 
      What size was the bolt / screw ? There are many ways but it depends on size / how flush / how long you have soaked AND can you manoeuvre the item with ease ?

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      • #4
        Re: Tapping/Re-threading service required in Adelaide

        Thanks for the responses guys.  I tried one of the easy out tools but without any luck.

        The bolts are 6mm and I have so far drilled into one of the bolts with a 5mm drill bit (incrementally starting with smaller bits), which by skill or luck seems to be nice and straight.

        I started trying to tap a new thread which appears to work ok with bolts of the same thread.  I only got about 5mm in before getting nervous and deciding perhaps I should leave it to someone with greater expertise & equipment. I figure if I stuff it up I may end up with a useless hunk of chromed metal.

        I guess if I did stuff it up I could always bore a larger size thread, there appears to be plenty of metal to work with around the bore.

        Perhaps when posting this thread I was hoping thered be a kind souled coffeesnob out there who also happens to be a metal engineer  ;D

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        • #5
          Re: Tapping/Re-threading service required in Adelaide

          Sometimes its also difficult for professionals
          They also use where appropriate, some heat in the surrounding metal to expand prior to extracting

          KK

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          • #6
            Re: Tapping/Re-threading service required in Adelaide

            Originally posted by 3A3B31223C3923500 link=1302052758/3#3 date=1302072451
            erhaps when posting this thread I was hoping thered be a kind souled coffeesnob out there who also happens to be a metal engineer 
            What, and live in SA.  Now that I would like to see  ;D


            If you can, as you going into a blind hole ?

            Make sure you start with the the taper tap, to be followed by an intermediate  tap and then a bottoming tap to finish the job. 

            Use lube (so many do not) and take it slow and steady.  It is about the journey, not a rush to the end. Also make sure you can flush / clean the work area.

            Opps...  Must stay OT.

            AND as you say you do have plan B 

            Post a pic as you have us all interested now  ;D

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            • #7
              Re: Tapping/Re-threading service required in Adelaide

              If you stuff it up and strip the thread, you could consider inserting a helicoil. (Usage example: http://coolercasesuk.co.uk/showthread.php?t=1211 )  Admittedly installation involves drilling and tapping too, but in this scenario you would keep the original 6mm bolt diameter after the job is done.

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              • #8
                Re: Tapping/Re-threading service required in Adelaide

                Thanks hangdog thats very handy to know.

                I eventually managed to tap & rethread myself. Tapping into brass is not that difficult, as I discovered.

                Am just waiting on some spare parts before I put it all together and fingers crossed!

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                • #9
                  Re: Tapping/Re-threading service required in Adelaide

                  Damn, disappointed reigns - I was going to offer my services as a Tapper (of the dancing kind, that is! ;D )

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                  • #10
                    Re: Tapping/Re-threading service required in Adelaide

                    I know this is an old thread, but if you need someone to retap a thread, no matter HOW obscure, go find a music-repair guy who specialises in old instruments.

                    In Adelaide, the only guy to see is Simon at Presto musical repairs. He did my naked portafilter for my 70s Europiccola too. Ive known him for about 11 years, and even worked for him for a while, and you can trust him with anything. Hope this info helps someone out...

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                    • #11
                      Re: Tapping/Re-threading service required in Adelaide

                      Just to chuck in my $0.02 here. IMHO the absolute best thing to use when you have a snapped off bolt/stud and need to extract it is a drill bit.

                      A left hand drill bit. Regrettably, not something you get at the local hardware, but often the drill itself spins out the remaining bolt once youre into it a fair way. Also regrettable is the fact that my drill press doesnt do backwards - so I have to hand drill. Still, hasnt let me down yet!

                      /Kevin

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