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Jan 05, 2019, 06:48 PM
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Build Log

1/4 scale Rc semi


I don't know if it's ok for me to post this here but I had done a build here
Years ago of a 1/4 scale 32' ford coupe.
I have some friends who want to see this so if it's ok I will get going.
Do to the size of the build I am forced to build it somewhere between
1/4 scale and 1/5 scale so that I can carry it out of the house .
The tractor will be 48" L 22"W and 26"h ,the trailer will be 8' L.
I am currently building the frame with two rear axels , this semi
will be powered by a 12v motor chain driven on the outside of the frame.
Since it will be electric I am building two differentials that will be for show only.
I will start to post pics in 2-3 days.
It 's an aluminum frame and I will use 1/8 and 1/4" styrene for the cab.
I bought a 1/4 scale pilot to have a figure to go by.
I am going to follow the semi in the picture below as close as possible ,the main
difference I want to have lights on the roof over the cab so I will do that section a little different
than the picture.
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Jan 07, 2019, 07:10 PM
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Here are some pictures from the last 4-5 days of work building the chassis .
It's 48" L and 9" W I used aluminum to get it as light as possible, the axels are from
Home Depot and I found the bearing in Ace Hardware .
These bearings have a lip so they fitted in the pipes nice and tight and the lip
prevents them from going in and out.
The shafts won't be cut to size until I know the width of the front axel.
The two rear axels are held in place with hangers , got them from the hardware store.
The two differential were cut out of a block of wood and I used a router to give them
some details, it wasen't easy to drill the center hole for the shafts to go through.
As I said previously these are for show , the drive will be on the outside of the chassis.
Originally I was going with leaf springs but no matter what I did I couldn't get them
strong enough to support the chassis and plus the weight of the trailer that will sit on them.
I picked up the coil springs on eBay they work out great.
The tires and the hubs are from Bishop 2"W and. 6" H
Next I will cut the front axel, I have all the temples for the cab already made from years ago so
one day during the week I should be able to cut out the cab walls and the bottom part of the sleeper.
The way I will assemble the body is like a jig sow puzzle 3 separate boxes .
Jan 10, 2019, 04:17 PM
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Today I was able to cut the entire body since I had the templets already made
And the sleeper already cut from years ago.
I will post an update this weekend after I glue it together.
Jan 11, 2019, 10:37 AM
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Nice work on the diff cases.

Jan 11, 2019, 10:49 AM
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Thanks Charlie .
Jan 11, 2019, 12:45 PM
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This morning I cut the front axle and started sanding the ends so
that these steering arms that I had will turn nice and free.
Last edited by Band1; Jan 11, 2019 at 05:29 PM.
Jan 11, 2019, 10:16 PM
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Does anyone know if I can use a power distributor like the one that Harbor Models sells
with the Tamiya sound system . This truck will run on 12v , the tamiya unit runs on 7.2 v.
Jan 12, 2019, 09:53 PM
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This was the 32' coupe that I built years ago .
Jan 13, 2019, 03:40 PM
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So here is the chassy almost complete except for the front axel that will get
mounted after the wheel well will be in place.
Last edited by Band1; Jan 13, 2019 at 05:31 PM.
Jan 13, 2019, 07:15 PM
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Wow this forum is really dead maybe not !
Last edited by Band1; Jan 14, 2019 at 10:05 PM.
Jan 14, 2019, 10:03 PM
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Today I spent the entire morning gluing together the cab, bottom sleeper
which right now is just a frame and the sides ( running boards)
I will post pics at the end of the week when it's together.
I made this jig and glued in two pieces of bending board they will sit in there until tomorrow
Night . These will be the front fenders after I cut them to size .
I like working with styrene a lot , it goes together very easy with Weldon 3.
Jan 15, 2019, 11:07 AM
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Keep up the good work. Very interesting.
Jan 15, 2019, 11:19 AM
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Thanks !
By the way the left side of the chassis is where the motor will go
The left tire in the rear will get hooked up to the motor while the
right rear tires in the back will spin free so that when I make a turn the
tires won't skip.
Last edited by Band1; Jan 15, 2019 at 11:30 AM.
Jan 17, 2019, 08:23 PM
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Last two days I glued all the sections together, like I had mentioned earlier I
had olready made the jig for the Windows for the side panels so all I had to do
was clamp the styrene to the jig and pass the router.
The side walls on the outside will get a 3/4 " panel to bring the sleeper out even
with the smoke stacks .
Next 2-3 days I plan to re enforce all the boxes from the inside.
It's going to be hard to take pictures do to the size , the front cab might look
a little bit squashed but it's not it's the camera.
I wanted to have the two tanks exposed on each side that's what the openings are for.
I cut the front fenders and added a piece of styrene on each side so that I
don't have to finish the wood top and bottom
Last edited by Band1; Jan 17, 2019 at 08:36 PM.
Jan 20, 2019, 07:37 PM
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Quick update of work from this weekend .
Framed out the rear fenders , I like the custom look of the tires hidden inside
it also gives the rear of the truck a much wider appearance .
I will glue one piece over the entire top to close the opening.
Last edited by Band1; Jan 20, 2019 at 07:49 PM.


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