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1/12 Scale Cat D11 Bulldozer project

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  • #46
    Originally posted by Frugalguido View Post
    I question for RB, how long did it take you to learn the CAD program to be able to do these drawing? And where did you learn it? Nice job!
    I bought a book that taught Solidworks by recreating a Meccano kit and building assemblies from the pieces you made. Next I did the same thing with the Kozo A3 switcher book that the host of this forum sells, applying what I learned. Then I was in California, had just lost my flying job and had to get really good quick with it to survive. I've been playing with parametric CAD packages for over a decade now. It is now a valuable tool for anything I build in the workshop.

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    • #47
      I promised pictures…
      Click image for larger version

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      • #48
        Question: In the last pic, what are we looking at cost wise?

        (Of the hydraulic components)

        Thanks, Sid

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        • #49
          Originally posted by sid pileski View Post
          Question: In the last pic, what are we looking at cost wise?

          (Of the hydraulic components)

          Thanks, Sid
          The 5 way hydraulic RC valve assembly was $150ish
          Each hydraulic cylinder was $24, the filter was $24 I think. Each track pad I printed used .17 cents in material.

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          • #50
            Your in deep now RB, no backing out of this one without a bite in the wallet and hurt pride lol nice looking cylinders and the price is right too...

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            • #51
              RB, What are you planning to do on making the links and the track pads ?

              One method : Print them all with your 3 D Printer and send to Shape ways for metal castings ( SS?) ( hint combine the pieces ....like six parts on one stick to reduce cost)

              Second method: Make a die (S) and hot forge them just like the originals were made

              Third method: Machine them from solid : Ugg

              Rich
              Green Bay, WI

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              • #52
                RB- correct me if I'm wrong, but the track pads look to be disproportionate to the other components.
                For instance, the filter is larger than the track pads.
                I realize that you are at the mercy of what is readily available. Also, component like that will be buried in the chassis.
                Not being critical, as I know you are in the beginning stages of design.

                Another thought for the track components; those shapes lend themselves to the extrusion process.
                The cost of the die is obviously the big expense.

                I wonder if once you are far enough on the design, you could get others to be interested in building one too.
                Tracks are not limited to dozers.

                I think it would be like the early days of extruded rail. Someone had to make the initial investment, then started selling the stuff.

                I hate to say it but, I'll bet you could find an off shore extrusion place to make the die(s) and run the material.
                Then your just looing at second ops to cut to length drill, C'sink the pads, cut to length the links, drill/ream.

                Hell, you could offer muck pads (high flotation?? whatever they call them).

                Sid

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                • #53
                  I'm almost sure RB211 has already seen these from Aliexpress and they aren't cheap, 20 USD+10.85 shipping for the pair. Could get expensive real fast!

                  https://www.aliexpress.com/item/32548895604.html

                  Click image for larger version

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                  Home, down in the valley behind the Red Angus
                  Bad Decisions Make Good Stories​

                  Location: British Columbia

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                  • #54
                    Better yet is

                    https://www.aliexpress.com/item/1005...014.2.24225810

                    But the problem is the scale is 1/14, not 1/12
                    Rich

                    edit ---was better link
                    Last edited by Rich Carlstedt; 11-29-2021, 08:10 PM.
                    Green Bay, WI

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                    • #55
                      There's a lot of cool stuff up on Aliexpress that my teenage self would of gone crazy for.

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                      • #56
                        Originally posted by RB211 View Post
                        There's a lot of cool stuff up on Aliexpress that my teenage self would of gone crazy for.
                        You mean they have hot women on Aliexpress as well?
                        'It may not always be the best policy to do what is best technically, but those responsible for policy can never form a right judgement without knowledge of what is right technically' - 'Dutch' Kindelberger

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                        • #57
                          Originally posted by A.K. Boomer View Post

                          Do roller chain bushing rotate? why yes that's what gives them the name "roller chain" --- used on my bicycle and in car engines and without them the engine would disintegrate in short order as well as my bike drivetrain...
                          On some dozer applications placed in severe service the undercarriage may have what the industry calls a S.A.L.T. track. Sealed And Lubricated Track, the pins run in oil with O ring seals. Long lasting, and of course priced accordingly.

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                          • #58
                            Originally posted by Richard P Wilson View Post

                            You mean they have hot women on Aliexpress as well?
                            They do actually if you search for lingerie, but I was referring to all the cool R/C stuff

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                            • #59
                              Originally posted by tom_d View Post

                              On some dozer applications placed in severe service the undercarriage may have what the industry calls a S.A.L.T. track. Sealed And Lubricated Track, the pins run in oil with O ring seals. Long lasting, and of course priced accordingly.
                              Sounds logical (and yeah more expensive but might be worth it) motorcycle chains have been doing that for decades - the quality ones anyways, little O-rings and pre-lubed pins, you still have to use chain lube for the sake of the externals but they really do work well for a long long time and reduce chain stretch... so in turn drastically increase sprocket life...

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                              • #60
                                Oh Oh Oh, With those miniature hydraulics I could build a scale model sheep shearing machine but use mice instead of sheep! Does anyone know if there are hairy mice?
                                Location: The Black Forest in Germany

                                How to become a millionaire: Start out with 10 million and take up machining as a hobby!

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