Newbie Scratch Build - D575A Dozer
Hi everyone and happy new year to wherever you may be !
This is my first post and I must say I think its harder to start this than the actual build ! I have been a long time lurker and reader of builds ( Coopers D11 was the first one I looked at and envied :D ) as I had accidently stumbled across this hobby a year ago on youtube. special mention to Titandigs, DR8 and the guy with the Dresser ? excellent builds and I am in awe of such dedication and workmanship. As a bit of history my day to day work has nothing to do with machining or engineering and 6 months ago I brought my first mill and lathe ( smallish). My available space is tiny so I have to be very studious as to what tools and equipment I gather. I have to date I have turned countless £'s ( I am UK based) of brass and steel into worthless chips on my shed floor :). I find it very calming and therapeutic ( apart from the cost of the metal itself!) I thought long and hard about doing a build thread and I figured eventually that I should try and help the next new guy as you longtimers have helped me so far. I figured it may help some others based on the other side of the pond like me and also I can ask critique from the more experienced builders here ( very selfish of me but I'm getting stuck on a few things!). so where to start ? Well I grew up in the bush in Tasmania and was always around heavy equipment and I remember an old guy with an equally old D8 working on our farm which lead me to the desire to make a dozer of some sort. There are a lot of cat fans here and amazing builds to match so I decide to go another route. I have decided to make this : https://i.postimg.cc/XGySkgPp/D575-3-D-Model.png I think its mainly a mining dozer and it looks different so here goes ! This is what I have built to date : https://i.postimg.cc/D4Fj4d3V/IMG-3410.jpg https://i.postimg.cc/y3Pfmg7D/IMG-3411.jpg https://i.postimg.cc/1nrNWD2r/IMG-3404.jpg https://i.postimg.cc/MXtQVbyW/IMG-3397.jpg plan is for an all steel build with some cosmetic top parts beingd 3d printed (may eventually make everything in steel) ill post some more descriptions of work done to date and pics ( I am not sure how this posting works :confused:) Cheers Rob |
Re: Newbie Scratch Build - D575A Dozer
Yoy’re off to a good start :) Looking forward to see the progress.
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Re: Newbie Scratch Build - D575A Dozer
So what scale you building in?
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Its been an ok start but I guess the pictures don't show all the drawings, searching, reading and trawling forums for the last 6 months to get to a point of something tangible on my dining room table even though its just a few bits of metal bolted together ! Actually when you finally decide on what to build and a scale that's only the beginning and a whole raft of decisions become apparent - motor size, realistic details or more functional, build materials, what you can actually build at home and what has to be outsourced, electronics ( I haven't even looked at this yet:jaw:) and hydraulics/actuators etc. Looking and reading others build threads have been the most help as they are slightly different in lots of ways and shows that you can achieve the same result by using different designs.
I have finally decided on a 1:14 scale although it was originally more a 1:16-18 size. I found that trying to build the tracks was a pain in the *** so brought some roller chain with attachments to shorten the process. This made me upscale to 1:14 to make things look the right size but somehow the roller chain didn't cut it for me in the looks department ( wanted more detail) and I switched back to home made links: https://i.postimg.cc/PN7FKhMF/PHOTO-...19-07-24-5.jpg i decided to stick with the 1:14 scale as i had gone down that road to far already to turn back and plus the additional size made things easier to squeeze things inside and or make parts. With the amount of time they take to produce, i am still worried that the tracks wont work properly somehow. I think i will just make one side complete with pads and run to make sure its all ok before continuing further. 3d printing is also a great help to make functional prototypes https://i.postimg.cc/xq9mXFNx/IMG-3401.jpghttps://i.postimg.cc/pm38yWKz/IMG-3399.jpg but without cnc, my manual milling abilities still has some variance that's not there on a 3d print ( still learning the milling operations as its my first mill) Fusion 360 has been a revelation in the build and has helped me no end plan things out before spending time and money on possibly wasted parts. I purchased a 3d model and started scaling and drawings parts in fusion 360that I could use and make: https://i.postimg.cc/Sntv1MC8/iso.png As my mill and lathe is on the smaller side, there is only some much time in the day to make parts so I decided to design parts in a sort of a layered manner to have someone laser cut the rough outlines for me to mill all the finishing touches and tolerances. I can then weld or bolt together the layers and grind/mill to shape. For the mechanical moving parts and drive train i have been trying to utilise readily available parts like bushes, bearings and pins to minimise my machining time but still ended up making what seemed like a million 6 mm brass sleeves for my track pins https://i.postimg.cc/Z0sXg6JH/PHOTO-...19-07-23-6.jpg i love having to learn new skills to make parts I cant buy ! I am currently working on finishing one side of tracks ( tedious so i am trying to do 3 sets of links a day ) and breaking this up by working on the drive train design and internal mounts for the motors etc. i do need some advice of the sprocket RPM etc but will put some questions together tomorrow and post cheers for now Rob |
Re: Newbie Scratch Build - D575A Dozer
Heck of an introduction there.
Very cool machine, should be really unique once it's done. Are these used inside mines? Maybe check if it lets you choose a little bigger format for the pics? |
Re: Newbie Scratch Build - D575A Dozer
Dang, you're off to an impressive start for a first build. Those track links are beautiful!
Frizzen, if you click on the pictures it'll open a bigger one. |
Re: Newbie Scratch Build - D575A Dozer
Great start Rob:)
I had to check how big this thing really is, and it's huge:eek: Also very well said about the amount of work you have to do before you start making any parts. |
Re: Newbie Scratch Build - D575A Dozer
I worked out the larger pics hot link :)
https://i.postimg.cc/wjTt1kvT/IMG-3420.jpg Half way through the track links for one side today. I have also been trying to work out the drive train printed a motor mount as a prototype to hold the 2 motors at the right angle to the drive shafts. I put the motors on an angle pointing at the axle so I would have to add in another set of gears before it turned 90 degrees. I have a 1:1 mitre gear set to get it to the sprocket. https://i.postimg.cc/7L5fVY0F/IMG-3422.jpg https://i.postimg.cc/Z5RRbK7W/IMG-3423.jpg I am actually surprised how strong this plastic is (ABS) and have changed my mind that I might as well leave it in and see how it goes. This also led me to try the speed of the motors and sprocket as a test. The motors are rated at 24v and run at 41 rpm. aAfter testing them on a 9 v battery ( 16 rpm) I have decide that I will have to somehow get a 2:1 ratio before it get to the sprocket. I am thinking 20 RPM would be an ideal speed - has anyone had any experience in this? thanks Rob |
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What diameter is your drive sprocket?
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Is there an easy way to make it 2 speed? |
Re: Newbie Scratch Build - D575A Dozer
So a little progress has happened since last time...
One side of the track links are complete ( awaiting metal to machine pads). these take so long ! Had some stock delivered for the idler wheel and roller wheels. will start machining over the next few weeks to size https://i.postimg.cc/SR4YZV40/IMG-3670.jpg Started the idler wheel … https://i.postimg.cc/Y2Q11L7K/2-DC69...C22-DECA53.jpg Quick question on electrics if anyone can help ?… so I am planning on using a 24v battery, running 24 volt motors which is easy as the sabretooth controller can take that voltage but what happens if I want to use a Premacon 12v hydro pump in the system - does anyone know what I need to reduce the volts for the pump? should have some more pics of the track carrages over the next few weeks once the metal turns up :) Cheers Rob |
Re: Newbie Scratch Build - D575A Dozer
Those track links are looking great! Where did you get the laser cutting done?
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Re: Newbie Scratch Build - D575A Dozer
I found a relatively local engineering shop that supplies all sorts of metal and cutting services. I have found that although laser cutting is fairly accurate, it still leaves me with a lot of work to bring the items to an acceptable finish. Laser cutting also leave poor edges and seems like it also hardens it?
Its still a lot better that cutting 10 mm plate steel with a hacksaw so I wont complain ! The round stock and flats I get from another supplier. I just send the diameters I need and lengths. I can use my lathe and mill to do the rest. One day if I get space to do so, I would like some sort of cnc but for now its all manual |
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Nice project you have going! |
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Re: Newbie Scratch Build - D575A Dozer
You could get another Sabertooth esc that will handle the 24v input voltage & set the the output voltage with a multimeter to the 12v pump.
The 2nd output on the 2nd Sabertooth could be good for a powerful winch on the back of your dozer. 2spd track motors - 2spd cordless drill motors... use a linear servo to change gears. |
Re: Newbie Scratch Build - D575A Dozer
I always perk up when I see a Komatsu machine being built. Yes, the D575A is a monster! Was designed for mining use, but one was used in Nevada by a housing contractor. It had a ripper to break up the caliche (some refer to it as petrified clay) near Las Vegas where no explosives were allowed. It was the only machine that could rip the stuff - ripper tooth would get so hot during use, it glowed, and had to be replaced almost daily. 1150 HP and about 300,000 pounds, 90 cu.yd. blade over 24' wide. Ripper shank almost 7 ft long.
Ken |
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That's for the great ideas !
So had a little machine time the last few weekends: https://i.postimg.cc/Ls8bJ6FY/IMG-3745.gif track profiles turned up so experimented with forming the right bends etc https://i.postimg.cc/8CpqLmMC/IMG-3747.jpg it needed a little trimming https://i.postimg.cc/3Nv63S5t/IMG-3750.jpg End result https://i.postimg.cc/mDr8gdMQ/IMG-3753.jpg the gap between the pads was a little too big so had to readjust the jig https://i.postimg.cc/pLnC9hp6/IMG_3757.jpg https://i.postimg.cc/mrYSwv33/IMG_3756.jpghttps://i.postimg.cc/hPxWnjKK/IMG-3752.jpg https://i.postimg.cc/d1DpxQWP/IMG-3759.jpghttps://i.postimg.cc/13ckgjgT/IMG-3758.jpghttps://i.postimg.cc/3r4zjR42/IMG-3761.jpg these are the ones I will be going with https://i.postimg.cc/tCfTS72y/IMG-3820.jpg they need slightly milling at the front so there is a couple mm tolerance but generally they operate well. still need practice on tig as my welds are shocking: ) |
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Re: Newbie Scratch Build - D575A Dozer
Excellent progress is being made, & it looks great, ESPECIALLY for a first build!
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Re: Newbie Scratch Build - D575A Dozer
Premacon sells a hydraulic pump & valve block that many ppl have bought before. https://shop.premacon.com/index.php?cPath=35 The pump/motor originates from this guy https://www.modellhydraulik.com/ though I'm not sure if the rotatory valves are exclusive from Premacon or not.
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Re: Newbie Scratch Build - D575A Dozer
Wow! Excellent work - details of tracks are really great, so I'm sure the rest of the machine will be exceptional.
Ken |
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Thanks for a the kind comments so far Rob |
Re: Newbie Scratch Build - D575A Dozer
Looks like your track pads are on the right track:D In post #19, I was looking at the angle of the bends and the grouser bar fit thinking that'll bind up as soon as they get some dirt/rocks/sand in them but I see you've made some adjustments and they look real good now.
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Re: Newbie Scratch Build - D575A Dozer
Few pics of things that are happening:
Experimenting with the track rollers: https://i.postimg.cc/6QRzwLpg/IMG_3851.jpg https://i.postimg.cc/D05BHvwz/IMG_3852.jpg https://i.postimg.cc/NGxJ54kw/IMG_3858.jpg https://i.postimg.cc/HssS5y68/IMG_3856.jpg These have come out really well and run nice and smooth. plus they add a lot of weight Track guides bolted together temporarily before welding together and milling to shape: https://i.postimg.cc/MKP9YpLP/IMG_3854.jpg https://i.postimg.cc/tTjkgZ1T/IMG_3857.jpg |
Re: Newbie Scratch Build - D575A Dozer
Great looking track parts, very well done!
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Re: Newbie Scratch Build - D575A Dozer
thanks Chris 👍🏻
It’s slowly getting into a functioning shape but I need to start focusing on finishing off everything and then start adding all the details that I want. I can see why some of these models take hundreds if not thousands of hours to complete. I guess when it finally moves a bit of dirt around it makes it all the more worth it ! Oh and the steel splinters 🤦🏼♂️ Rob |
Re: Newbie Scratch Build - D575A Dozer
Hi All
Hope everyone is safe and well ! Its been a wee while since I last posted any updates but I have been busy honing my skills and completing parts that just take ages (undercarriage). I have nearly completed one side and making fast progress on the other now that I know how it all works ! enjoy the update pics: https://i.postimg.cc/xjMm6NC5/IMG_4153_-_Copy.jpg https://i.postimg.cc/YCR20MSQ/IMG_4156_-_Copy.jpg https://i.postimg.cc/gJYvRYyd/IMG_4159_-_Copy.jpg https://i.postimg.cc/jSpcW0kd/IMG_4160_-_Copy.jpg https://i.postimg.cc/zXP0rRCh/IMG_4158_-_Copy.jpg https://i.postimg.cc/dtt5tfVN/IMG_4163.jpg https://i.postimg.cc/tRzrbbpV/IMG_4165.jpg https://i.postimg.cc/ncR0s1sF/IMG_4196_-_Copy.jpg https://i.postimg.cc/T3KQnWmr/IMG_4233.jpg https://i.postimg.cc/MTSDkPLD/IMG_4237.jpg https://i.postimg.cc/13bBB5cb/IMG_4238.jpg https://i.postimg.cc/q7XKKkms/TDWY6584.jpg |
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Sorry about the photo bombing :eek: didn't realise I had done that many !
https://i.postimg.cc/MZd1pK4V/IMG_4204.jpg https://i.postimg.cc/L6WfjQms/IMG_4495.jpg https://i.postimg.cc/tCJWZGQf/IMG_4494.jpg working on the transmission and making good progress so fingers crossed I can get it moving under it own steam soon Rob |
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Beautiful work!
Kerst |
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This is pretty awesome (and I can appreciate the hours spent before each picture could be taken).
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Excellent work !
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The more photos the better! I also enjoy text. I love reading about how people make their own models and how they get around/solve problems along the way.
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Today I was adding in some details to the drive sprockets and fixing details: https://i.postimg.cc/qBX8VTKC/IMG_4496.jpg https://i.postimg.cc/Wb1qBJjQ/IMG_4497.jpg https://i.postimg.cc/Hkj5y8hQ/IMG_4498.jpg https://i.postimg.cc/rscx0hBm/IMG_4499.jpg https://i.postimg.cc/dt5r3j4s/IMG_4504.jpg https://i.postimg.cc/YSG1JLNp/IMG_4506.jpg https://i.postimg.cc/d3qZthCZ/IMG_4509.jpg The drive and transmission has been the most time sapping process to date. as I am not of a engineering background this has taken maybe far longer than it should have. Although there are a few very amazing scratch builds on this forum there wasn't enough details to help me make a knowledgeable decision in my build. So this is what I have gone with : 24v motors https://gimsonrobotics.co.uk/categor...d-24v-versions 1:2 reduction bevel gears to make right angle transition Linear and thrust bearing on the internal shaft + locking nut Tapered roller bearing in the hub/sprocket to sort out both axial and radial loads? I will post some pics of the setup this week to illustrate more details to follow :) |
Re: Newbie Scratch Build - D575A Dozer
Mind dump incoming !
from my limited experience these are the following things I have learned that have made the most difference: Get a DRO ! - its all about making parts that are repeatable ! this makes it so much easier ( CNC is the next step maybe one day) Get quality tools if you can - you have probably heard this so many times before and I can attest buying a £20 M2 tap is far better than one that costs £2 ( trust me the cheap one will break on the first few holes whereas the other will just carry on for hundreds) Be methodical - making repeatable parts means cleaning between parts , resetting dials, taking your time. don't take short cuts. Design before any fabrication - as I am going along I actually wish I would have drawn everything up in Fusion 360 before I started. you can waste so much time re-centring / setting up parts that could be done in one . Vinegar cleans all the mill scale and heat (soldering) blackening off metal you could ever need ! ( Bio Carb soda stops the process). I wish I knew tis from the first day. clean stock metal is very helpful when making repeatable parts. I am still figuring out the rest ! Rob |
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As someone who has never tried to build anything like what is found on these forums I find myself coming back everyday for updates and to admire the talent and ingenuity (and zero drama). Thank-you for sharing.
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Very nice work, looks beautiful!
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Re: Newbie Scratch Build - D575A Dozer
Hi Everyone
its been ages since i have updated my progress on the dozer but its been a crazy year and progress has been patchy. This is basically where i have got to since the summer: https://i.postimg.cc/YqqjKZwz/11.jpg Almost ready for a test run in the dirt ! :) Cant wait to see it actually move by itself ! ( blade and ripper still in progress) The main time consuming work were making the second track and all the under carriage elements. Not really worth posting as its just a replica of what i had already made and extremely boring ! What can be seen in the image above at the moment weighs in at 40 kg (88lbs) and with the ripper and blade/hydro pump etc should be about 50 - 55 kg in total. I may try and see if i can rig up a makeshift blade to see how the traction works. So going back to where i left off, i had some issues with making a right angle gearbox and initially when with this: https://i.postimg.cc/hGbnhrjc/7-DF7-...002700-B81.jpg The gear box, axle and drive train have taken a lot of working out and time as i could not really tell if i was on the right track ( not from an engineering background) and i was worried ( still am a little bit :) ) that the whole things might chew it self apart. after several trials with f |
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