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AHM Center Cab (HO scale) Possible On30 Bash

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  • AHM Center Cab (HO scale) Possible On30 Bash

    When I was on the "Dark Side" I had bought this center cab switcher to use for a boxcab in On30. Well I saw the light and never did the bash. I did just recently find out how to make it run slower from another forum I visit. So here's what it looks like and in the next post I'll get into making it run slower.



    Bernd
    New York, Vermont & Northern Rwy. - Route of the Black Diamonds

  • #2
    Ok, here's how to make it run slower.

    First disassemble. Those worms in the bag is the secrete to making it run slower. The motor has a 2 start thread. The brass Atlas gears are a one thread start. So if my math is right it should cut the speed in half. I bought the worm gears from this guy.

    http://www.ebay.com/itm/BRASS-WORM-G...3D351452889845



    The stripped down chassis.



    I used my mill to press the shaft off of the worm gear.



    Then I used a drill smaller than the shaft that the worm is mounted on and finished pushing the shaft through.



    The worm on the motor can be pulled off by hand.



    I pressed the worm on to the motor using the same drill, mounted upside down, to push the motor shaft into the worm. Noticed the jaws are closed on the vice. Keeps me from pushing the shaft to far beyond the end. The needs to be done carefully so you don't bend nothing. I did notice that one side of the worm went on part way before having to use the spindle on the mill to push it in.



    When I went to assemble everything back together I broke the plastic retainer clip that holds the motor down on the back side. I've got a fix I going to try. Whether successful or not I'll post the results.



    No I'm not going back to the "Dark Side". Just passing an idea along incase you're looking to do a "critter".

    Bernd
    New York, Vermont & Northern Rwy. - Route of the Black Diamonds

    Comment


    • #3
      The Master is at it again.......

      Looking forward to this one Bernd....

      Comment


      • #4
        I have two of those sitting in a box; I will be watching. BTW the drive will navigate a 6" radius curve.

        Comment


        • #5
          Another interesting project, Bernd.
          Bruce

          Comment


          • #6
            I had one of these chassis under a critter. it ran "ok" when it ran, it was the bit between the still and the scale 15 miles and hour i didn't like ha. i pulled it out and swapped for a 45 tonner, i'd love to see how this turns out, it's sat in a box somewhere.

            Also.

            Stop this whole lying, you cannot stop your destiny.

            Join us.

            Comment


            • #7
              quote:


              Originally posted by Geezer


              The Master is at it again.......

              Looking forward to this one Bernd....


              Thanks Geezer. Keep up those compliments and I won't be able to get my head through the door.

              Was contemplating between a wooden boxcab or an end cab. Think it'll be a boxcab. Going to try a different building material this time. I've been watching members on the forum using cardboard as a sub structure to glue individual boards to. I'm going to give that a try.

              Bernd
              New York, Vermont & Northern Rwy. - Route of the Black Diamonds

              Comment


              • #8
                quote:


                Originally posted by BigLars


                I have two of those sitting in a box; I will be watching. BTW the drive will navigate a 6" radius curve.


                I'll be going for two on this build. As I told Geeezer I want to try cardboard sub-structure with individual boards on top. Now here comes the shocker. I'm going to build the shells to On30 since my original intent was to make a cab unit and a cables unit for HO use. So at the end the shell will be available.

                Bernd
                New York, Vermont & Northern Rwy. - Route of the Black Diamonds

                Comment


                • #9
                  quote:


                  Originally posted by Dutchman


                  Another interesting project, Bernd.



                  Have lots of interesting projects but not enough time for them all. On nice days I'm outside finishing up brick work on the house. I need to get that done before the landscape guys get here this fall. So progress will be slow on this project.

                  Bernd
                  New York, Vermont & Northern Rwy. - Route of the Black Diamonds

                  Comment


                  • #10
                    quote:


                    Originally posted by andykins


                    I had one of these chassis under a critter. it ran "ok" when it ran, it was the bit between the still and the scale 15 miles and hour i didn't like ha. i pulled it out and swapped for a 45 tonner, i'd love to see how this turns out, it's sat in a box somewhere.

                    Also.

                    Stop this whole lying, you cannot stop your destiny.

                    Join us.


                    Since I didn't get a video of how it ran before I changed the worm gear and also needing another unit for a cables booster I bought another one off E-bay. I'll take a video of both running together for comparison.

                    Bernd
                    New York, Vermont & Northern Rwy. - Route of the Black Diamonds

                    Comment


                    • #11
                      A progress report.

                      I came up with an alternative to the broken clip that holds the back of the motor down. I used a piece of .030: brass wire, annealed it and did a wrap around on the end of the motor. The I wrapped some fine wire around the joint and soldered it. On the other end I used a piece of 3/16" brass rod. Drilled and tapped for an 0-80 screw. I soldered that to the end of the wire with enough room to pulled the back of the motor down with a screw.







                      Today I laid out the sub-base for the chassis to mount the body to, which needs to be designed yet. I made two sub-bases. Now the question is do I make the body "identical twins" or "brother & sister"?

                      I started by measuring the chassis for the cut out size of the base. Laid out the lines and once the lines were laid out I temporarily glued the two pieces together so I would get two identical sub-bases. Each sub-base is made from .060" thick styrene.



                      Next I drilled a hole near one of the lines and began cutting out the inside. I used a rough wood cutting blade in my fret saw. This is the end result.



                      Next the two sub-bases are pried apart and the cut edges are cleaned up so it's a snug fit over the chassis.



                      3/16" square styrene was glued to the outer edge for good support of the side and end walls of the cab that is yet to be designed.



                      The glue needs to dry so this is where I'll end for today for this project. On to some other project waiting in the wings.

                      Bernd
                      New York, Vermont & Northern Rwy. - Route of the Black Diamonds

                      Comment


                      • #12
                        Pretty cool "immagineering" on the motor support Bernd...whoodathunkit?

                        You are off to a good start on the base(s) - my vote is for a "Bro/Sis"

                        theme....good luck & looking forward to the next installment.

                        Comment


                        • #13
                          Very interesting as usual Bernd'..That is a cool engine mount you devised'..

                          I'll be lurking along waiting for finial test runs'...on theses babies'....


                          Ted

                          Comment


                          • #14
                            quote:


                            Originally posted by Geezer


                            Pretty cool "immagineering" on the motor support Bernd...whoodathunkit?

                            You are off to a good start on the base(s) - my vote is for a "Bro/Sis"

                            theme....good luck & looking forward to the next installment.


                            The fix was one of those "Aw poop, now what". A little thinking away from the project and wham-o an idea. [^]

                            Ok, "Bro/Sis" it is.

                            Bernd
                            New York, Vermont & Northern Rwy. - Route of the Black Diamonds

                            Comment


                            • #15
                              quote:


                              Originally posted by quartergauger48


                              Very interesting as usual Bernd'..That is a cool engine mount you devised'..

                              I'll be lurking along waiting for finial test runs'...on theses babies'....


                              Always try to be interesting. Don't want my audience falling asleep.

                              Bernd
                              New York, Vermont & Northern Rwy. - Route of the Black Diamonds

                              Comment

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