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  #1  
Old 04-18-2017, 03:45 AM
SteinHDan SteinHDan is offline
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Default Bruder 574 RC conversion weekend project!

Hi!

I know there has been a lot of Bruder 574 conversions, but not one like this one..

The goal was to try to convert the Bruder 574 to RC with the very least amount of work during a weekend. (Easter had a long weekend and thus it would be possible)

Note that there is no steering servo in this conversion!





There are some 3D-printed parts in the front and in the back:



The front and rear axles are 30mm aluminum tubing with 2mm walls.


I re-used the wheels:



All the wheels are driven by a 12v 24rpm gear motor:




The hubs I got from Ebay didn't have a thread, so I tapped a M4 thread in them:




I 3D-printed a stencil to help guide where the holes should be:




Then I assembled the rear pivot:




















Cut away the fake axle to make room for wires going from the front to the back:




Assembled the front section:




Like in the rear there is a small screw holding hitting a small hole in the axle that fixes it in the printed part:






The motors are held in place by two M4 5mm long set screws, one on each side (for balancing the position in the tube):






I remove one screw from the firgelli actuators and re-insert that into the holder. That way the actuator is fixed inside the holder:












I re-purposed the original Bruder axles in both ends of the boom cylinders. The new lengths were 100mm and 85mm. I cut away that part that previously held the wheels.






I 3D-printed another stencil to help guide where the holes in the bottom should be. It's important to do this before cutting away the original axle mounts, otherwise there will be no reference points:






3D-printed a stencil for the top holes as well:












The top cylinder is mounted with two M4 screws:




For the boom cylinder mounts, i just added something to avoid them sliding inwards:









Video:







Stein :-)
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  #2  
Old 04-18-2017, 12:43 PM
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Nick Furia Nick Furia is offline
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Wow. Looking good.
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  #3  
Old 04-18-2017, 02:03 PM
SteinHDan SteinHDan is offline
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Thanks, Nick!


In case anyone wants to try the same approach, here are the 3D files:

The full model in Fusion 360 format:
- BruderLoader+v13.f3d

The individual 3D-printed parts:
- BoomCylinderMount.stl
- FrontBottomHolesTemplate.stl
- FrontSideSpacer.stl
- FrontStructure.stl
- FrontTopHolesTemplate.stl
- RearAxle.stl
- RearAxleMountFront.stl
- RearAxleMountRear.stl
- WheelBoltsTemplate.stl



Stein :-)
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  #4  
Old 04-18-2017, 02:10 PM
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Rolex Rolex is offline
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Brilliant. ALL your builds are incredible.

Go Norge!
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  #5  
Old 04-18-2017, 04:41 PM
SteinHDan SteinHDan is offline
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Thanks, Rolex!


Here are some specs on the parts too:
- A normal 4ch RC transmitter and receiver (for once no embedded PC :-) )
- 1 x 3S battery ~2000mAh
- 2 x Sabertooth 2x5 R/C
- 4 x JGA25-370 12V 24RPM
- 1 x L12-S Actuator with Limit Switches - 30mm - 100:1 - 12 volts
- 2 x L12-S Actuator with Limit Switches - 50mm - 100:1 - 12 volts


The steering is controlled by wiring the motors such that both the front and the rear part move as tanks, but in opposite directions. I only use one controller for both the drive and steering. The other controller controls the boom and bucket.

The wiring for the drive motors:
- Channel 1: Front left motor + rear right motor
- Channel 2: Front right motor + rear left motor

The first motor controller works in mixed mode. The other in normal mode.


Stein :-)
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  #6  
Old 04-21-2017, 04:45 PM
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Coolaid202 Coolaid202 is offline
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.

Wow! Very nice job.

After watching your video I was wondering how the steering worked. Very cool, would have taken me a long time to figure that out.

Now I want to get one.
.
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  #7  
Old 05-11-2017, 05:27 AM
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Thats awesome Stein and the fact that you share the files makes it that much more amazing........Thanks!
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5 ton of fun
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Old 06-15-2017, 02:56 PM
SteinHDan SteinHDan is offline
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Here are two videos of the first dirt digs:











At least it digs normal dirt with small rocks and all, even if it's not a full bucket on each load. :-)


Stein :-)
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Old 07-03-2017, 11:53 AM
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Awesome build!
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Old 07-03-2017, 01:37 PM
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Nice build, how do you rate the actuators? I noticed you have ones with just the red and black wires as opposed to the ones with white, black and red like regular servos, any key differences you know of? They seem controllable and not just on or off like I'd expect, do they plug into your receiver?
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Old 08-05-2017, 03:22 PM
Torquer Torquer is offline
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Brilliant! Excellent work, you have even inspired me to make one myself. Thanks so much for providing those 3d printing files, I have sent them to a friend to print out for me.

I've sent you a PM with a couple of questions.

Thanks, Jonathan
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Old 08-09-2017, 03:39 PM
SteinHDan SteinHDan is offline
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Hi Jigglepin!

Yes, I'm using just the ones with limit switches. You control them with a motor controller. I use the Savertooth controller i mention in post #5. That gives me variable speed and incremental movement (like on a real loader).

I don't use the servo version for these reasons:
- The two servos won't necessarily be completely similar and might fight each other when there is no movement.
- The embedded servo controller controls the speed of the movement, which I don't need or want.
- You would need to add additional logic to get the incremental movement (and not the default absolute positioning that servos has). You can get the incremental movement with advanced radios or with an extra controller on the servo lead. But it feels like a waste to add absolute position control with the servo version of the actuator and then removing all that again with an additional device, and they also have their own drawbacks like that they have to move the servo to a known starting position when you power up the loader.


I even believe the limit switch versions are a bit cheaper than the servo versions?


Best regards,
Stein :-)
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  #13  
Old 08-09-2017, 03:45 PM
SteinHDan SteinHDan is offline
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Thanks, Jonathan! :-)

You asked some good questions and I see that I've left out some information. I'm posting it here for anyone else interested:

- The aluminum axle tubes are cut to 135mm length.
- The wheel hubs (4mm axle) were bough here: http://www.ebay.com/itm/322385127356


Best regards,
Stein :-)
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  #14  
Old 08-27-2017, 11:45 AM
SteinHDan SteinHDan is offline
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I've also put the STL files up on Shapeways if there anyone not owning a 3D-printer but still wants to get the parts made:
- https://www.shapeways.com/search?q=s...loader&t ype=
I think Shapeways is very expensive, though... I think you're better off printing at a friend's house, work, school or similar.

There is a third alternative and that is https://www.3dhubs.com/
There you can get the parts printed on someone's 3D printer close to you.


Best regards,
Stein :-)
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  #15  
Old 08-27-2017, 12:02 PM
SteinHDan SteinHDan is offline
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I bought a smaller radio for my sons to get a better grip:

- https://hobbyking.com/en_us/turnigy-...er-mode-2.html




It did not have self-centering for all the axis on the joysticks, so I opened it up to see if there was just something to screw loose or something like that to get it to self center.

But there was a part missing to get the self-centering functionality. I copied the design in Fusion 360 and 3D-printed a new part.

- STL file: http://d1t2tbzmskak12.cloudfront.net...tickCenter.stl












Also, the spring was missing. I took that from an old donor radio.




Putting it back into the radio:






The end result:
(now with self-centering on all axis)







Stein :-)
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