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  #1  
Old 01-08-2012, 09:14 PM
johnjabour johnjabour is offline
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Join Date: Feb 2009
Posts: 4
My first TTTT

I finally finished my first 1/87 scale tractor trailer. I posted a video on youtube

http://www.youtube.com/watch?v=CNTAX...e_gdata_player

It's radio control using Spectrum 2.4 GHz transmitter and reciever. It also uses a Spectrum servo for the steering. The motor is a GM15 pager motor with a 25:1 gearbox. It runs on a 200 ma Lipo battery. It uses a modified servo board for the speed control. I need to build a better speed control (esc) because slow speed doesn't work as well as I would like.

I also want to add lights to it.

As you can see in the video, everything is housed in the tractor. One of my biggest challenges was finding small bevel gears. The ones i use now are from a
Rc helicopter tail rotor but I would still like to find smaller gears.

I made alot of the parts on my small Sherline CNC milling machine and my Atlas
Lathe (you could make the parts without a CNC machine but it would take a little
Longer.

I would be glad to post pictures of the internal workings if anyone is interested.

John
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  #2  
Old 01-16-2012, 12:51 PM
onequiknova onequiknova is offline
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I'd like to see some pictures of your build.

I recently finished a 1:87 scale semi as well.

http://www.scale4x4rc.org/forums/showthread.php?t=65597
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  #3  
Old 01-19-2012, 09:29 AM
johnjabour johnjabour is offline
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Onequiknova

I'll take some closeups later on and post them.

I also checked out your build and am very impressed.
Nice job!

I use a servo board as an esc but don't get very good low speed performance.
I'm planning on building a better one. It will also have some lighting circuits built in ( do you think i can add sound too! Lol).

John
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  #4  
Old 01-19-2012, 04:14 PM
johnjabour johnjabour is offline
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Here is a link to a youtube video with the internal showing

http://www.youtube.com/watch?v=xM-DI...e_gdata_player
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  #5  
Old 08-02-2012, 07:50 PM
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tinyrc tinyrc is offline
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Superb! Just curious: how much does it weigh?
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  #6  
Old 08-30-2012, 09:29 PM
kalkurap kalkurap is offline
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Join Date: Feb 2005
Posts: 40
Hi John,

Very nice model and neat machining, congratulations. It looks very scale, you have been able to fit everything inside the cab! I haven't seen a steering setup like this until now, it is one of a kind.

I hope you are still around as I have a couple of questions, and I hope I get to hear back from you on those. They are as follows
1. Does the front axle articulate, if not, do the rear axles articulate, in other words, how do you manage to keep all 6 wheels on the ground?
2. How do you like the current gear ratio, is it high, low or just right?
3. Where can one find the gear box that you have used, did it come with the pager motor?
4. What U-joints are they?
5. Do you have and make or part number of the bevel gears?
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  #7  
Old 11-28-2012, 07:45 PM
johnjabour johnjabour is offline
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I don't know if you still want this info but here it is.
I haven't been on the forum for a while but I'm back now improving the Volvo and I almost have a Pete done.
The tractor weights 85 grams (3.0 oz).
None of the wheels are articulated. Since only the front rear axle is powered, I just let the rear rear axle float up and down with oval holes for the axle. I also only drive the truck on reasonable flat roads. I may add suspension later (on the todo list).
The current ratio (25:1) works pretty well but I would like a lower top speed and more low speed control, so if I could find a gear ratio of 50:1 or 100:1 I would think it would meet my needs better. I built my own ESC so my slow speed performance is much better then when I used a servo board as a ESC. My ESC also has light control but I haven't hooked up the lights yet.
The pager motor (GM15 from Solarbotics) came with the gear box.
I made the 1 ujoint myself. The one on the Volvo is OK but sloppy. The one I made for the Pete is much neater.
The bevel gears that I used came off of a Centry RC Helicopter. They are for the tail shaft. The part number is cne305 and you need 2 kits to do one truck. You can do a google search to find where you can buy them. I would still like to find smaller ones so that I could power both rear axles.
Thanks
John
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  #8  
Old 01-16-2014, 03:25 PM
Share2 Share2 is offline
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Hello, world
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