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Big Rigs, Multi axle, & Tracked Vehicles The place for "Semi" talk!
Tamiya and Wedico Tractor trailers!
Tamiya and other brand R/C Tanks and Tracked vehicles. And any vehicle with more than 2 axles; 6x6, 8x8, 10x10, etc!


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  #76  
Old 11-12-2018, 06:14 PM
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That's gonna be the coolest desk lamp!

Especially with all the blinky lights going, and a siren
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  #77  
Old 11-13-2018, 05:49 PM
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That is soooo sweet!

Ditto Frizzen.. I can only think of one additional function that would make it an unbelievably awesome desk lamp... hook it up somehow so it starts flashing and sounding when your phone rings... now THAT'S a custom ringtone hehe
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  #78  
Old 11-13-2018, 08:07 PM
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Weeeeell.... There is a bluetooth module in there, so it wouldn't be completely impossible to make that happen.
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  #79  
Old 11-15-2018, 04:27 PM
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Some extra fine tuning and wired up the side facing work lights for the first time.




Video of the above.
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  #80  
Old 01-27-2019, 04:06 PM
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Magnet mount for the water tank section.




Workaround to get the rear crossmember at the right height compared to the body. The frame rails are too high because of reasons I no longer remember. The plan is to also use it as a mount in a transport case if I ever get around to making one.







More side facing work lights. They all worked right after building them, but one broke while the glue fully cured a week later. I should probably get a cheap USB microscope to check these fragile 2835 LEDs for damage after soldering.








I've also been doing some work on the rear storage compartments. The right one now contains a mini-usb that serves as both 5v supply in display mode and programming connection for the Arduino. Two switches selects USB or battery power for the Arduino and USB or BEC power for the low power LEDs.












And hopefully done with the soldering on the main circuit board.




I'm completely rebuilding the RM60C roof monitor / water cannon / turret. This time I'm trying to get as close to scale as possible. Simple hinge mechanism located as close to the center as possible to replicate the way it lowers and rises with the pitch motions. I've really been struggling with figuring out how to make this work. I was hoping to fit both the rotation and pitch servos, but even after downsizing to 3.7g servos I've ended up with moving the rotation servo to the roof to keep the scale size of the monitor body. There just isn't room in there for both of them with that hinge, lights and the stiff nitro fuel line.












Bonus picture

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  #81  
Old 02-27-2019, 03:23 PM
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This fire monitor keeps throwing problems at me that I never considered. One of them is how to make a simple swivel mount with low friction that is both stable and can be attached and detached reasonably quickly. Another issue is the geometry of a flexible tube. If it bends at another radius or another location than the hinges, the tube will need to stretch. This causes strain on the servos that they can't overcome. I've solved it for the pitch servo, but I don't see a solution for the rotation axis. Currently, rotating the monitor 30 degrees moves the end of the silicone tube by half an inch.

This is my current attempt at a swivel mount using a ring magnet on a thin tube that snaps to a ball bearing inside a large tube.






Carving cosmetic ridges on the nozzle shroud. They really made a huge difference to the scale appearance.





I gave it another shot and managed to carve out enough support structure to mount the swivel rotation servo on the inside, made a removable structure to hold the pitch servo and swivel mount and got the skirt mounted. I also apparently killed the pitch servo. I was hoping it was due to glue, but it looks like I bent the output shaft a fraction of a degree. That's a bit worrying, as I can't fit larger servos. Also visible to the rear is a bent styrene guide tube that helps reduce the strain of the pitch servo caused by the silicone tubing.






Other than these issues I'm very happy with the body. The construction with thinner layered materials make it surprisingly strong and light.

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  #82  
Old 04-02-2019, 06:24 PM
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Switched to a thinner tube (2,5mm vs 3,5mm inner diameter, but much thinner walls) and now I'm not that worried about the servos. Did some testing, and the water flow is still acceptable. The nozzle still needs to be smaller than that anyway, to get a suitable throw distance.

I've hidden the connection between the 7mm and 2,5mm tube inside the dummy pipe going to the monitor. The thin tube needs a loose S curve or a loop to not hinder the rotation of the monitor, but I'm not 100% sure this is the best way to do it. The alternative is to let the water tube exit the top of the monitor. The real monitor has a thinner tube there (I believe it's for foam chemicals). That would mean another major change to the monitor though.






I really don’t want to do that change though, because I'm almost happy with the filling and sanding on the back of it.




In other news, I also tested the design for the water level sensor, and It's nowhere near reliable enough. I'm ditching the transistors and went with another arduino. This will also let me send the water level and all the battery + BEC voltage levels as telemetry data through the receiver, or I could display the current gear or other data on the LEDs instead.


My main pump operates one way only, so I'm going to use my backup 12v nitro fuel pump to fill and drain the water tank. By chopping off some bits with a hacksaw I can just about fit it in the space on the left side below the tank compartment, giving me plenty of room for the tank itself.

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  #83  
Old 04-07-2019, 05:46 PM
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Started a very simple roof liner. Holes for interior dome lights and mounted using the same magnet setup that holds the roof platform.





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  #84  
Old 04-08-2019, 04:46 PM
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Rough center console / divider / shelf thing.



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  #85  
Old 04-08-2019, 06:05 PM
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Wow, that's so sweet!

I forgot you still had the interior to build
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  #86  
Old 04-08-2019, 06:54 PM
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Yep, interior, water tank, side panels on water tank section, all the stuff on the roof of the rear sections, moving rear wheels again, painting... The fun isn't quite over yet

For now I'm only doing a basic rough interior so I can figure out how to mount the larger parts and route the wires for lights. I can add details later when the truck is drivable. (At least that's the theory)
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  #87  
Old 04-09-2019, 03:33 AM
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Looks good!

Quote:
Originally Posted by Wombii View Post
Yep, interior, water tank, side panels on water tank section, all the stuff on the roof of the rear sections, moving rear wheels again, painting... The fun isn't quite over yet
I guess this is one of those lists that's getting longer everytime you look at it? I have some of those as well
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  #88  
Old 04-24-2019, 09:18 PM
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Finishing up the rear fenders. Side marker light should hopefully work with a 3mm LED, no fiber optics.




5mm warm white LEDs in the monitor.






Got another two boxes of yellow paint. This batch still doesn't fully match the first two, but it's less green than box 3. I also got the correct plastic primer which I'll be testing both alone and in combination with the Tamiya primer. Tried spraying it, and it's tricky to ensure good covering of a clear spray on white plastic.
Painted the pump section with yellow paint on white Tamiya primer.




This is very much not a scale feature, but I'm cheating a bit and making a carrying handle. It shouldn't be too obvious hidden in the other mess on the roof, and it will make it a lot less scary to move the thing.




Final image is a follow up on an earlier test. Tamiya TS-63 Nato black and TS-82 Rubber black. Bottom half was no clear coat, top half Motip clear coat. On top of that is a stripe of Tamiya Flat clear crossing both parts. Observations: Nato black is more green, rubber black is more blue. The glossy clear coat makes them look much darker and closer in color. Tamiya flat clear on top of the glossy clear returns them to their natural look, but flat clear on top of the "raw" paint adds slightly more light gray.



In the last week I've started to feel I have a chance of actually finishing this someday. My todo list fits on one page now. (Although it will probably keep growing)
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  #89  
Old 04-24-2019, 10:58 PM
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Never mind how long the list is, truck is epic. Good thinking on the handle as it's hard enough to grab a normal rc let alone one as complex as this.

Which way are you going to go with the bumper paint?
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  #90  
Old 04-25-2019, 09:01 AM
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Rubber black is the perfect color, but I'm not sure about the clears. As far as I can tell, the front bumper should be shiny, the front fenders flat plastic and the rear somewhere in between. I don't like how dark it gets with the glossy clear coat though. The front fenders look absolutely perfect with just the paint, but I think it needs some protection. I know Tamiya has a semi-gloss clear, so I might have to test that as well. Or I could just stop worrying about matching the glossiness of each part to the real thing.
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