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Someone put metric screws in my BP!

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  • Someone put metric screws in my BP!

    So if my other posts haven't tipped anyone off I've been trying to
    get my bridgeport (Jhead) into better shape.

    had a laundry list of things to take care of including a Y axis scale
    that gave up the ghost halfway through. Tried cleaning it a dozen times
    and chalked it up to a scratched scale.. been using 1/2 my table for
    .. sheesh.. probably a year now.

    heidenhain scales and they cost a fortune on ebay so i've been make'n
    due.

    decided to have one last go at it, used some windex and patches for cleaning
    air rifles (and 22s?).. really put some elbow grease into it this time figured
    it was broken away.

    got it back together and now i got my full range back. I'm a happy man.

    put a rubber way cover behind the table. still have to figure out how
    to do the front.

    adjusted gibs etc etc when i went to see how much backlash was
    in my screws.

    used the dials .. measured in at about 20thou .. ouch.. but when i looked
    at the DRO the numbers didn't match!

    turns out this thing has metric screws on X and Y (knee is still imperial)..
    1 turn was giving me 0.236" (!) .. which is 6mm.

    and I was about to put out some cash for new nuts too.

    I know there's no question here.. maybe no point either... but you know..

    just when you thought you knew a guy...

    Tony

  • #2
    some have dual dials ..mine has ..

    inside the dial is a little nylon gear that buggers up..

    perhaps yours has ..when the gear is taken out it reverts to imperial....with the metric dial just spinning and doing nothing.


    all the best.markj

    Comment


    • #3
      Originally posted by Tony
      used the dials .. measured in at about 20thou .. ouch.. but when i looked
      at the DRO the numbers didn't match!

      turns out this thing has metric screws on X and Y (knee is still imperial)..
      Tony,

      Let me guess. You bought the BP from Lord John, didn't you?
      Last edited by MichaelP; 09-04-2011, 03:57 PM.

      Comment


      • #4
        Originally posted by Tony

        turns out this thing has metric screws on X and Y (knee is still imperial)..
        1 turn was giving me 0.236" (!) .. which is 6mm.

        ony
        One turn is 0.236" when it should be 0.250" which is an error of 14 thou.
        Well within a Bridgeports tolerance

        Seriously looks like you have a DRO on it ?
        My machine is imperial and I work solely in metric, I never look at the dials, in fact they are spinning free all the while and rely on the DRO.
        Never have to think twice about making a part. Knee is imperial as well but I only use this for getting into position and use a Chinese digital display on the quill for downfeed.

        I do have a spare scale to put on the knee but I need to start from scratch as regards mountings etc and just never bothered.
        .

        Sir John , Earl of Bligeport & Sudspumpwater. MBE [ Motor Bike Engineer ] Nottingham England.



        Comment


        • #5
          Yes there's a DRO, the only dial i ever use is the knee and that's still
          speaking english.

          I was going to order nuts but now I suppose I have to make them.. or
          get them made.

          -Tony

          Comment


          • #6
            Originally posted by John Stevenson
            One turn is 0.236" when it should be 0.250" which is an error of 14 thou.
            Well within a Bridgeports tolerance
            Bridgeports are supposed to be .200" per revolution not .250" per.

            Comment


            • #7
              Originally posted by Tony
              Yes there's a DRO, the only dial i ever use is the knee and that's still
              speaking english.

              I was going to order nuts but now I suppose I have to make them.. or
              get them made.

              -Tony
              when new ive heard that bridgeport comes with a split nut that is still joined up .

              when it wears you split the nut..take it off and part it in two with hacksaw or what ever

              you may still have the original nut ..and it may just need splitting

              all the best.markj

              Comment


              • #8
                Originally posted by Mcruff
                Bridgeports are supposed to be .200" per revolution not .250" per.
                Ooops yes you are right, so that's an error of 36 thou, still just within limits
                .

                Sir John , Earl of Bligeport & Sudspumpwater. MBE [ Motor Bike Engineer ] Nottingham England.



                Comment


                • #9
                  John,
                  how come youre here and not out working on s'more 5C/ER
                  indexers?! You're gonna make me wait a whole nother week?

                  ps while you're here have a look at the one shot lube thread.. will one
                  of those for myfords/X3's work on a bridgy? None on ebay .. all in US.
                  Last edited by Tony; 09-04-2011, 05:05 PM.

                  Comment


                  • #10
                    so- you guys are suggesting that bridgeports have lucas parts in them?
                    I seldom do anything within the scope of logical reason and calculated cost/benefit, etc- I'm following my passion-

                    Comment


                    • #11
                      Originally posted by darryl
                      so- you guys are suggesting that bridgeports have lucas parts in them?
                      Probably, Bridgeport and Lucas are both American
                      .

                      Sir John , Earl of Bligeport & Sudspumpwater. MBE [ Motor Bike Engineer ] Nottingham England.



                      Comment


                      • #12
                        Lucas parts for Bridgeport = smoke

                        Originally posted by darryl
                        so- you guys are suggesting that bridgeports have lucas parts in them?
                        Sir john had better buy a few bottles of smoke ,just in case .

                        Michael

                        Comment


                        • #13
                          I cannot see the problem metric is a more accurate measurement system (as 0.01mm = 0.0004") so you have a more accurate machine because it if fitted with metric lead screw...



                          Lets see what I catch.. : D
                          Precision takes time.

                          Comment


                          • #14
                            Originally posted by .RC.
                            I cannot see the problem metric is a more accurate measurement system (as 0.01mm = 0.0004") so you have a more accurate machine because it if fitted with metric lead screw...



                            Lets see what I catch.. : D
                            Might have a finer pitched screw being metric but it's still a rubber Bridgeport
                            .

                            Sir John , Earl of Bligeport & Sudspumpwater. MBE [ Motor Bike Engineer ] Nottingham England.



                            Comment

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