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Die-Cast Conversions Tech. The tricks of installing drive line and electrical components into die-cast models.


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  #21  
Old 07-27-2016, 08:50 AM
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Default Re: 1/16 Oliver Dozer Conversion

I think it is going to work. I have one real loose and one tight side and at this point no good way to control tension. This particular die cast uses springs on the front rollers for tension but the travel is short and not designed for this sort of use. I haven't figured out just how yet, but I plan to make the rear motor pod adjustable in some sort of sliding action.

The blade lift servo seems to do okay, more testing required. Really frustrates me that the specs of the sabertooth controller and spec of a hitec 645MG indicate that it should work fine, but obviously that ain't true! FYI, even when I ran a separate bec for the RX from the same power source it acted the same way. So, that makes me think the sabertooth is putting out some funky RF causing the RX to act up. All this behavior is while the servo is sitting idle, so it must really be drawing some power even idle?

I should have also mentioned that if the RX is powered by a different battery completely isolating the RX, AND servo from the motor controller that then it all works. This is exactly how I ended up doing it in my crane. Don't have room for a second battery in the dozer.

Anyhow, enough bitching, here is the bench test video!

http://youtu.be/rMa8AcXsnow

Last edited by Rvjimd; 07-27-2016 at 09:09 AM.
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  #22  
Old 07-27-2016, 01:22 PM
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Default Re: 1/16 Oliver Dozer Conversion

Here is a short video of the first test run in the dirt. I am out of practice and i have to solve the loose track issue. Otherwise I think it is going to be usable.

http://youtu.be/T1b-CVwDljI

Jim
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  #23  
Old 07-27-2016, 02:16 PM
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Default Re: 1/16 Oliver Dozer Conversion

It looks good in the dirt, seems to have plenty of push. I have no experience with those motor controllers but have a couple trucks with 645 servos and they are serious power hogs. I run a receiver battery in the trucks that have them so I don't notice it.
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  #24  
Old 07-28-2016, 04:45 PM
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Default Re: 1/16 Oliver Dozer Conversion

It keeps getting better...

Today I put bearings in the main drive assembly. I'm sure that will help runtime and power to the dirt. Added a dual rate and slowed it down to about half speed so I can control it pretty well when pushing. This way I can hold the stick full forward and steer, while running the blade with the other stick.

I think I might have a bit of descent footage finally!

http://youtu.be/-n_qGyaEwGU

Jim
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  #25  
Old 07-31-2016, 12:34 AM
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Default Re: 1/16 Oliver Dozer Conversion

I'd go with a separate BEC so when you are under load or possibly even stall the motors you don't have issues. If you run a separate BEC, you would not use the power wires from your esc to the receiver. Also I note that your diagram had a flip channel which is mostly used for bots. It can be used to drive in reverse easily but can just as easily be left unused. Cheers.
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  #26  
Old 07-31-2016, 11:34 PM
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Default Re: 1/16 Oliver Dozer Conversion

I hope I don't jinx myself but I think I figured out the problem I was having with the sabertooth!

First I have to say, I can't believe the dimension engineering help desk never asked or suggested this... All I got from them was some nonsense about regen and battery capacity, they even suggested that I try a 2000mah battery Ya, where am I gonna put that sucker in is tiny dozer?

Anyway, maybe this will help folks with similar trouble.

I was about to see if a slot car motor would replace the motor on the back end of my gear drive units when I realized the carrera digital motors always use capacitors across the motor leads to suppress noise. So I shortened the motor leads as much as I could, added a cap to the pos and neg poles and grounded them to the can. I also wrapped the signal wires from the blabber tooth to the RX with foil.

Here is a link to one site that I referenced to help with the solution.

https://www.pololu.com/docs/0J15/9

If you guys are thinking, "I always add capacitors to my brushed motors" you won't hurt my feelings if you say so. I just never even thought about it, but it makes sense now! I used to race associated 1/10 scale pan cars on a paved oval and we NEVER installed the caps on the motors back then and that was with old Futaba fm radios and old novak speed controllers.

I have run two battery packs with not a hint of trouble.

I bet on a bigger conversion where stuff is not literally right on top of each other, the problem might not happen.

When the blade servo had the jitters before, I always thought, that seems like radio interference?

Thanks for putting up with my rant...

Jim

Last edited by Rvjimd; 07-31-2016 at 11:37 PM.
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  #27  
Old 08-01-2016, 11:17 AM
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Default Re: 1/16 Oliver Dozer Conversion

I need to apologize for the terrible video quality, but I was not able to load it directly from the sad card due to the resolution or some hogwash so I took video of the video using my phone from the iPad. Nice

Anyway, it started raining here this am, since naturally I figured out my trouble with the dozer and really wanted to give it a good test outside but can't.

So, moved a small dirt pile into the shop to test out the rewired electronics! It is working great!

Here is a time lapse shaping the dirt pile, this took me about 5 minutes I think...

http://youtu.be/2ZsPuKlSZDM
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  #28  
Old 08-01-2016, 12:24 PM
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Default Re: 1/16 Oliver Dozer Conversion

That's a pretty good video, if for no other reason but comedy relief! Glad you got it figured out, looks like a lot of fun!
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  #29  
Old 08-01-2016, 03:41 PM
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Default Re: 1/16 Oliver Dozer Conversion

Here is another video, I cranked this one up to 4x using the editor...

http://youtu.be/dvh2xbz_Qdk

Jim
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  #30  
Old 04-21-2017, 07:50 AM
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Default Re: 1/16 Oliver Dozer Conversion

New motors for the diecast Oliver Dozer!

Here is a very short Timelapse video of the first test with the new motors.

https://youtu.be/o-xMCmtyr0Y

I broke another one of the economy gear motors in the Dozer at cabin fever this year so the plan was to try the planetary gear version. I had the Dozer on the bench since January and FINALLY got around to installing the new motors.

I had to make a bushing/sleeve for the new motors because they are just a tiny bit smaller diameter and didn't fit into the existing motor mounts, so got those made on the lathe.

Another problem I had with this project was with the sabertooth motor controller. I finally added capacitors to the motors and that solved it, BUT, as I installed the new motors I decided to try powering the new motors WITHOUT the caps and so far the seem to operate with less electrical noise and I didn't have the same trouble! So, if you are using the economy gear motors from servo city I would recommend adding capacitors to control the interference noise that causes problems for the sabertooth. And, the motor can of the new planetary motors looks different and I suspec it is a little better quality motor. Time will tell...

For those interested here is a link to the old spur gear motors and another link to the new planetary motors at Servocity.


Old spur gear motor - https://www.servocity.com/56-rpm-econ-gear-motor

New planetary motor - https://www.servocity.com/52-rpm-pre...ary-gear-motor

And I have a question about these motors for you tech type guys-

As I post the links I expected to see a higher torque vale for the planetary motors but that is not what I read? Is this based on the motor more than the gear style and ratio?

Jim

Last edited by Rvjimd; 04-21-2017 at 08:06 AM. Reason: Added motor links
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  #31  
Old 04-21-2017, 10:17 AM
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Default Re: 1/16 Oliver Dozer Conversion

I was having too much fun so I made another short dirt pushing video.

https://youtu.be/WlxGPWZ8s5I

Jim
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  #32  
Old 04-21-2017, 11:21 AM
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Default Re: 1/16 Oliver Dozer Conversion

Anyone ever find a good way to reduce the dirt pack between the track pads on a crawler machine?

I know this is common, I have tried waxing the pads and I think that helps for a bit.

Also, when I run on extremely dry dirt there is almost NO problem. But, if the dirt Has a little moisture in it the leading AND trailing edges get the dirt packed on them causing the pads to heave away from each other. The biggest trouble this causes my machine is that it becomes hard to blade a nice even level grade cause the track start to get a round curve to them and the entire machine will rock fore and aft while moving forward. This makes holding the blade constant very tricky.

Anyhow, I'm just thinking out loud and....

This is just after cleaning


Here is a shot from the back, showing the bevel gears and you can see the bushing I had to make to fit the new motors.


Side view of one of the new motors installed. The bushing hides the gearbox section of the gearmotor


Jim
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  #33  
Old 05-05-2017, 08:01 PM
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Default Re: 1/16 Oliver Dozer Conversion

Video of the little Oliver working the sand pile at the barge dock.

https://youtu.be/W7rCP09_O5U

Jim
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  #34  
Old 05-06-2017, 03:17 AM
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Default Re: 1/16 Oliver Dozer Conversion

Little, but strong and effective
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  #35  
Old 07-22-2017, 10:24 PM
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Default Re: 1/16 Oliver Dozer Conversion

Quote:
Originally Posted by Rvjimd View Post
I finally got around to creating a new dozer video with sound.

It had been a while since if had run the dozer and I think I should have NOT been using a 3S lipo, it made it faster than I remember and harder to operate. I think I probably smoked the RX. I Fahd forgotten that I eliminated the ESC...

http://youtu.be/B4jSvXfoKXg

Jim
NICE Dozer you have there! I wish I could scratch build something like that, but I'm not that skilled with metal working
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  #36  
Old 07-22-2017, 11:47 PM
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Default Re: 1/16 Oliver Dozer Conversion

Skeeter, thanks.

It is a diecast model that I converted to RC. I had to do a bit if simple machine work for the motor mounts and bearings on the drive axels but it wasn't too bad.

Jim
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