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1/16th scale radio-controlled Komatsu D455A-1

Discussion in 'Models and Miniatures' started by tournaphil, Dec 26, 2019.

  1. tournaphil

    tournaphil Well-Known Member

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    We've started the fifth machine, the Komatsu D455A-1 radio controlled. This machine is approximately the same size as the 41's, in fact, it knocked the 41 off its perch as the largest on the market at the time. It will be an approx 1500 s/n machine from 1986 and will be modelled from the same machine featured in PA Minings youtube documentary video of the D455A-1 shown here. The D455A-1 was considered to be the 1st Super Dozer placed on the commercial market, as mentioned by PA Mining.

    P A Mining D455A-1.jpg

    This is the 1:1 machine we will build, a 1986 Komatsu D455A-1 with full-U blade and 4-barrel Super Ripper. This photo is from P.A Mining's documentary video to show the machine.(Photo courtesy P A Mining.)

    Progress report: Progress to date is the grousers are done and ready to bolt to the chains.
     
    Last edited: Dec 26, 2019
    RollOver Pete and cubanator like this.
  2. tournaphil

    tournaphil Well-Known Member

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    We've been busy on the D455A. Drawings are completed and all the parts have been acquired or laser cut in mild steel. Like the previous models, this is an industrial model using industrial components. The motors are F350 window winder motors geared down at 4:1 chain driven to the final drive 5/8" dia final drive shafts which are keyed to the drive sprockets. Unlike the 1:1, we are not expecting any final drive problems. Here are some build update photgraphs.

    Tracks-1.jpg

    Tracks completed. Everything starts with the tracks accurately built, laid out and to scale.

    card-mock-up-for-laser-cut-.jpg

    Next stage is to make a mockup, very importantly, sitting on finished tracks and rolling gear. This is just like the auto manufacturers used to do. As redimentary as it looks here, it's vital to get the dimensions right at this point along with the drawings before committing $$ to the steel supplier and laser cutter.

    wooden-test-frame.jpg

    Test frame with motors and rolling gear fitted to prove the drawings before committing to laser.

    laser-cuts-2.jpg
    Some of the detailed laser cut parts prepped for the welding bay.
     
    Last edited: May 3, 2020
  3. tournaphil

    tournaphil Well-Known Member

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    Some more progress pics of the D455A-1. Note this is a + 1500 serial number machine like the machine in the first photo by PA Mining.

    welding-main-frames.jpg
    The main frame tub and track frames mig-welded. Very strong, a good rigid base for the model with plenty of frame strength to hang the U-blade and ripper.

    cab-int.jpg cab-final.jpg

    While waiting for the laser cutters I build the cab for the EROPS.

    framed.jpg

    Basic frame welded
     
  4. tournaphil

    tournaphil Well-Known Member

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    blade-sheets-rolled.jpg

    We got the U-blade sheets rolled by a sheet metal company in a set of slip rollers. They did a good job, pulling those three-radii tri-planar curves into the end sheets and two radii into the center sheet. They are just propped up here, they align nicely and we'll tig-weld them in the backsides.

    Tilt-Cylinder.jpg

    Tilt cylinder I spun up on the lathe. The full U has one tilt cylinder and one tilt brace.
     
    Last edited: May 3, 2020
  5. tournaphil

    tournaphil Well-Known Member

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    455A-U-blade-welded.jpg
    20' U Blade has been welded. Good strong mig-welds here. They'll dress up nicely leaving a rough worn appearance.

    D455A U blade rough finished.jpg
    U blade rough finished. Ground engaging not fitted yet. Looks like it has already spend 10,000hrs on the job.

    Rops-fit-test.jpg
    Made the rops to dimensions from the parts manual in 1:1 balsa to check fit. Next I'll make it in resistance welded tube and it will be all welded with mounts. Most of the parts here I have made are drawn in a drawing program using the OEM parts manual as a guide. Unlike the Caterpillar parts books of which many are engineering drawings and can be scaled straight off, the OEM Komatsu manuals as are the Fiat-Allis and Allis-Chalmers manuals, reasonably accurate drawings but not acurately to any scale. So they are a good guide but require a complete redraw for use in building. So in making something like this, it is essentially back to square one and start from scratch for the drawings.
    I've seen a few drawings in 3D programs on the internet however, they are of no use in building an actual working model without a massive redraw in CAD, nothing connects and the material thickness is simply a drawn line. That's a huge headache. So I don't use CAD, we can roll our own in half the time and just as good or better using 2- dimensional drawings and some good ole metal work on the work bench in way less time than it takes to fiddle around in a tricky CAD program. I did use CAD for the CHTZ T-800 though. Once was enough, more time was spent in CAD than at the workbench, back to the tried and true drawing with a calculator and basic 2-dimensional drawing program and some good ole marking and scribing tools.

    D455A-and-AC-HD-41.jpg

    Here's the D455A-1 and the HD-41. They are basically the same size machine and use the same engine, a Cummins V1710-C-700. The HD-41 uses a Twin-Disc trans and the D455A uses a pair of D355A trans mounted side by side in the one case. The D455A is a little heavier by about 10 tons depending on mounted equipment and just a little longer in the main frame and track frames. U-blades for both are 20 feet wide.
     
    Last edited: May 23, 2020
  6. tournaphil

    tournaphil Well-Known Member

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    ripper-lever-frame.jpg
    Single tine Super Ripper draft frame completed. It will have both lift and ptich rams. Since this machine is the predecessor to the prototype D555 which became the D575A-2, I will use the same rams as I did on the D575A-2 model.
     
    Last edited: May 23, 2020
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  7. tournaphil

    tournaphil Well-Known Member

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    positional-set-up-test.jpg

    Here we have the D455A-1 set up just for obtaining and measuring some positional dimensions like setting the distances for the blade lift rams, tilt cylinder and the ripper lift and pitch barrels before I go ahead and make them. I'm going to have to spin those up on the lathe so it will be a while yet before I can get back on it. The barrels for the lift rams are already done. It's weighing in at about 29lbs at this point for the bare tractor which scales out in 3 dimensions at 1/16th scale to approx 117,000 lbs for the bare tractor scaled back up to 1:1. The U-blade weighs in at 27,000lbs and the ripper at 14,000lbs on the 1:1. So for a 1:1 machine we are looking at about 166,000 lbs with fluids, full U and super single. At 29lbs for the bare model tractor at 1/16th we are looking for another 11lbs in weight with the blade and ripper and finishing touches for it to scale out at approx 166,000lbs in the 1:1. We know the blade, draft arms and ripper box weigh 9lbs at 1/16th so its getting very close to scale in weight. There's not a lot in terms of weight to be added to it taking into account all the above.There's an awful lot of detailing work to go in yet though, this is just the basic fabrications.
     
    Last edited: May 27, 2020 at 7:30 AM
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