Lead screw gauge

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Lead screw gauge

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  • #441957
    Mike 90
    Participant
      @mike90

      Hi all, I’m new to the site, and have just bought a Chester DB7, lathe my question is, the lead screw handle has a bracket that limits the travel, can the bracket be removed and will the gauge still engage ok, I can’t really see it’s perpose anyway.

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      #37821
      Mike 90
      Participant
        @mike90
        #441980
        Tony Pratt 1
        Participant
          @tonypratt1

          Do you mean the far RH bracket that is locating the leadscrew?

          Tony

          #441981
          JasonB
          Moderator
            @jasonb

            Sounds like the thread dial, yes you can just undo the long cap head screw that it pivots on and remove. Ideally put a small screw back in the hole so any swarf does not find it's way into the apron.

            #442079
            Mike 90
            Participant
              @mike90

              It’s the lever that engages the lead screw, there’s a small bracket with a notch, the warco 180 is the same as my Chester, apart from the bracket, I can’t see what the bracket does apart from making engagement aqward.

              #442089
              Journeyman
              Participant
                @journeyman

                I assume the bracket arrowed in the image below:

                bracket.jpg

                Seems to serve little purpose and looks quite crudely made. Could it be a shipping device?

                John

                #442099
                Bill Davies 2
                Participant
                  @billdavies2

                  Does it limit the amount of disengagement? Agree with John it seems pointless, unless the cams or slots opening and closing the half nuts (or is it a single half nut) are loosely toleranced.

                  Bill

                  #442100
                  not done it yet
                  Participant
                    @notdoneityet

                    I would be aiming my question towards Chester Tools. They should know why it is different from other ‘virtually identical’ machines and the reason for that difference. I suspect there is a reason for it and it is not a shipping device.

                    I note there seems to be (several) differences between similar machines from individual suppliers – motor power and weight being others, at least.

                    #442104
                    Split Pin
                    Participant
                      @splitpin

                      The bracket is there to prevent accidental engagement of the lead/feed screw, I found that when it was it new it was a bit notchy, Pulling the sleeve handle up to clear the notch and getting clean engagement is a bit of a knack which develops over time. It helps if you move the saddle with the hand wheel at the same time,usually away from the chuck this help aligning the half nut with the thread on the lead screw.

                      Steve

                      Edited By Split Pin on 17/12/2019 17:37:31

                      #442143
                      Howard Lewis
                      Participant
                        @howardlewis46836

                        I wondered if the handle needs to be pulled out, to clear the bracket, so that it can turn to engage the half nuts.

                        This assumes that the bracket is there to ensure that the half nuts are not engaged accidentally.

                        Howard

                        #442166
                        Mike 90
                        Participant
                          @mike90

                          Thanks for the answers all, Pulling The handle out and pushing down does release it a bit but when it’s released back in, the handle stops half out the half hole in the bracket, do you know if the handle is supposed drop out of the bracket completely, or is it just tight because it’s new, many thanks guys.

                          #442175
                          Hopper
                          Participant
                            @hopper

                            Sounds liek the halfnuts are riding on top of the leadscrew threads, stopping full handle movement. Are you doing this with the leadscrew rotating? It might take a second or two for the nuts to fully engage with the leadscrew threads. Or if not rotating, you might have to move the carriage along with the handwheel until the nuts drop into full engagement.

                            #442191
                            not done it yet
                            Participant
                              @notdoneityet

                              Chester Machine Tools
                              Clwyd Close
                              Hawarden
                              CH5 3PZ
                              Tel: 01244 531631
                              E-Mail: sales@chesterhobbystore.com

                              © 2018 Chester Machine Tools

                              #442410
                              Mike 90
                              Participant
                                @mike90

                                Thanks all , I have sent Chester an EMail , just waiting for reply, but have since found the gauge wasn’t fully engaging in the lead screw, stopping it turning properly, and all what was needed was fully tightening the Allen crew locating the gauge on the spindle, it was slightly loose so when moving the handle down it wasn’t engaging in the thread properly, Many thanks again.

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