Mill runs backwards

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  • maddog
    Member
    • Jul 2004
    • 86

    Mill runs backwards

    Every now and then, when I turn on my mill
    (forward), it runs backwards, and reverse
    runs forward.

    I'm using a static phase converter. The
    maker told me its my drum switch, not the
    converter.

    What do you guys think?
  • Forrest Addy
    Senior Member
    • Oct 2002
    • 5792

    #2
    If when it runs backwards and you feed in chips, does it put 'em back on as solid stock?

    Could be the start cap is bad.

    Comment

    • lynnl
      Senior Member
      • Jan 2002
      • 7181

      #3
      What kind of mill is this?
      Lynn (Huntsville, AL)

      Comment

      • maddog
        Member
        • Jul 2004
        • 86

        #4
        Bridgeport J head.

        Comment

        • Bruce Griffing
          Senior Member
          • Jan 2003
          • 1093

          #5
          It is almost certainly your RPC. It is not starting reliably in the correct direction.

          Comment

          • lynnl
            Senior Member
            • Jan 2002
            • 7181

            #6
            You are aware that when you switch from hi to low speed range or vice-versa, the spindle rotation reverses? ...requiring the motor rotation be reversed to compensate.
            At least the ones I've seen.

            Pardon me ...if you're describing something else.
            Lynn (Huntsville, AL)

            Comment

            • maddog
              Member
              • Jul 2004
              • 86

              #7
              <font face="Verdana, Arial" size="2">Originally posted by Bruce Griffing:
              It is almost certainly your RPC. It is not starting reliably in the correct direction.</font>
              Its a static converter..

              Comment

              • Bruce Griffing
                Senior Member
                • Jan 2003
                • 1093

                #8
                Sorry - did not notice the "static" phase converter.

                Comment

                • Jimmy
                  Member
                  • Jul 2003
                  • 63

                  #9
                  I think lynnl has your answer.

                  Comment

                  • maddog
                    Member
                    • Jul 2004
                    • 86

                    #10
                    DUH!! Lynn nailed it. I didn't realize
                    that until I tried it. That was it!

                    Comment

                    • wierdscience
                      Senior Member
                      • Jan 2003
                      • 22085

                      #11
                      The sad part is,my current boss is a PE,and I had to explain that to him,took a sermon on the history of back gearing to do it to.

                      He actually accussed me of wiring it backwards,thats when the fur started flying,see I said there are to fowards on this model and no reverse

                      If you really want to scramble your brain,try hooking up an rpc to a four speed backgeared drill press,24 motor leads,long tall drum switch,lots of head scratching
                      I just need one more tool,just one!

                      Comment

                      • lynnl
                        Senior Member
                        • Jan 2002
                        • 7181

                        #12
                        That's not the first time that's been overlooked. And I'm sure it won't be the last.

                        All too often the obvious is anything but.
                        I'll always remember an incident shortly after I got married. Back in the 60's my new bride and I were driving thru S. Ala in a car that I'd just recently bought to replace one I'd wrecked. Out in the middle of nowhere, steam started blowing out from under the hood. I checked it out and could see a crack in the upper radiator hose. I Let it cool for awhile and filled the radiator from a creek beside the road. Drove a few miles and stopped at a country store. Went in hoping to find some duct tape to patch it up, but could only find some masking tape. While I was impressing my new bride with my mechanical ingenuity by wrapping that tape around the leak, an old geezer walked up and watched for a couple of minutes. Then he said "Sonny, if it'us me I'd just cut that thar bad end off'n that hose and connect it back up ...be good as new!" A lesson in humility. I said something like "Yeah I was just thinking about doing that..."

                        Lynn (Huntsville, AL)

                        Comment

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