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  #61  
Old 03-21-2021, 01:09 PM
Originalrob Originalrob is offline
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Smile Re: Newbie Scratch Build - D575A Dozer

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Originally Posted by Lil Giants View Post
Well done Robert!

Have you weighed it yet?
Hey !

So had a bit of free time this afternoon and weighed it up as I need to think about the balance issue that’s causing it’s to sit on it’s front idlers. I don’t know what happened but I have miscalculated the weight somewhere. Without the blade and arms it’s 51kgs. The blade and arms is 21kgs so that’s why it’s causing an issue.I weighed the ripper metal I have ready to assemble and it’s about 7kgs plus it hangs far about the back it will help balance some of the blade weight. I might have to add some steel ballast to get it right. So in total maybe 80kgs in the end. A bit heavier than I anticipated but the motors still move it about easily
I can see my glass bathroom scales getting cracked tho
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  #62  
Old 03-21-2021, 01:25 PM
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Default Re: Newbie Scratch Build - D575A Dozer

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Originally Posted by sparkycuda View Post
Being an avid Komatsu guy, this build is great! Detail, proportion, function are just like the real Super Dozer. Congratulations on a successful first hydraulic test.
Ken
Thanks Ken/Egronwold

It’s been a such a long process with limited time to work on it but I can’t wait to get it to a point where I can push some dirt around! I have promised myself this summer it will happen 👍🏼
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  #63  
Old 03-25-2021, 04:27 PM
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Default Re: Newbie Scratch Build - D575A Dozer

Don't think you miscalculated on the weight/balance concern. The real dozer has a massive counterweight when not equipped with a ripper. The 1:1 machine is very nose-heavy without either. So, maybe just about right!

Ken
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  #64  
Old 03-29-2021, 06:35 PM
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Default Re: Newbie Scratch Build - D575A Dozer

80kg WOW

Some general measurements of blade? LxH ...the dozer itself LxWxH? I'm not familiar with the background objects in your pictures to get an idea of its size.
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  #65  
Old 04-16-2021, 09:41 PM
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Default Re: Newbie Scratch Build - D575A Dozer

Just some comparative weights from the real machine.

D575A-3SD Super Dozer. Operating weight 336,000 lbs. Counterweight was 11,900 lbs. Had a 90 cubic yard blade.

D575A-3SR Super Ripper. Operating weight 289,000. Single Shank ripper could rip 6'9" deep.

They were rather large!!

Ken
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  #66  
Old 05-02-2021, 04:31 PM
skeeter skeeter is offline
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Default Re: Newbie Scratch Build - D575A Dozer

It's great to see this beast come to life! I LOVE scratch builds!
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  #67  
Old 05-03-2021, 08:09 AM
Originalrob Originalrob is offline
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Default Re: Newbie Scratch Build - D575A Dozer

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Originally Posted by sparkycuda View Post
Don't think you miscalculated on the weight/balance concern. The real dozer has a massive counterweight when not equipped with a ripper. The 1:1 machine is very nose-heavy without either. So, maybe just about right!

Ken
HI Ken

i think your right, i added some crude weight to the back and its rolling a lot better on the tracks now. Plus i added some stiffer rate springs to the tensioner and that seems to help as well. I have started the ripper now so should have it attached in a couple of weeks.

in the mean time i added some details to the blade:

must be like strengthening bars on the side of the blade



My own version:







I will take some pics to give a sense of size later today maybe with a can of coke or something but blade is about 500 mm wide ( 21 inch) x 250 high (10inch)

Rob
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  #68  
Old 05-04-2021, 10:14 PM
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Default Re: Newbie Scratch Build - D575A Dozer

Yes, ribs for strengthening but also anti-abrasion. These machines were used to push in all kinds of material. WV and KY machines worked slot-dozing in a lot of sandstone, so experienced extreme wear on the ends - I've seen those ribs completely worn away. Often users would add more abrasion resistant steel on the blade ends before ever putting them to work.
While the weight is extreme compared to other RC dozers, it was huge in real life - largest production dozer in the world. Big dozers are just heavy!

You are doing a great job!

Ken
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  #69  
Old 05-10-2021, 06:29 AM
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Default Re: Newbie Scratch Build - D575A Dozer

Hi all,

Had a bit of time over the weekend so put together the steel for the ripper and installed to test out the weight balance.





I dont have the rams yet just just mocked up with some bars and rod ends. Took it for a spin and the balance is much better.

Rob
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  #70  
Old 05-10-2021, 06:21 PM
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Default Re: Newbie Scratch Build - D575A Dozer

Keeps looking better all the time!

Ken
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  #71  
Old 05-25-2021, 08:43 AM
Wibb Wibb is offline
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Default Re: Newbie Scratch Build - D575A Dozer

Impressive machine!
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  #72  
Old 05-25-2021, 09:30 PM
skeeter skeeter is offline
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Default Re: Newbie Scratch Build - D575A Dozer

That machine looks fabulous with that ripper on it!
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  #73  
Old 02-17-2023, 08:10 PM
dozerbuilder dozerbuilder is offline
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Default Re: Newbie Scratch Build - D575A Dozer

Do we have an update on this fabulous build?. How did it go in the dirt?
Cheers
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  #74  
Old 02-18-2023, 05:12 PM
Orange RC Works Orange RC Works is offline
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Default Re: Newbie Scratch Build - D575A Dozer

This is one amazing build...
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  #75  
Old 05-15-2023, 02:22 AM
Originalrob Originalrob is offline
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Default Re: Newbie Scratch Build - D575A Dozer

Hi everyone!
Wow I can’t believe it’s been so long. Life gets in the way too much now but I’m determined to get this done !

Just finalising the rams for the tilt on the blade and should be ready. Below is a video of the ripper hydraulic test which worked out great. More to follow. Thanks for the interest in the build.

Rob

https://youtu.be/-w3CDwHl3Ww
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  #76  
Old 08-15-2023, 08:13 PM
dozerbuilder dozerbuilder is offline
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Default Re: Newbie Scratch Build - D575A Dozer

Do we have an update on this fabulous build?. How did it go in the dirt? Is it completed??
Cheers
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