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Thread: My take on a scale drivetrain (pic heavy)

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Old 06-22-2011, 07:31 AM   #1
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Default My take on a scale drivetrain (pic heavy)

I have always loved scale builds but being OCD I feel disappointed when I cannot put the detail into a build that I imagine when I conceive the build. That disappointment usually leads to me taking the build and setting it on a shelf or in a box for months if not years. I think my biggest problem is I get overwhelmed by all the detail I want for the entire rig and if it is marketable as a product so that causes the burn but I think I found a fix for me. I started to dedicate time to builds for me. The most fulfilling ( and the best selling ) RC parts I have ever came up with are the ones I made for myself originally. So, here is my scale drivetrain.

First I think we need a little background. I first came up with this idea about 5 years ago tinkering in my garage. I had a pile of gears, bearings, and some TLT and TXT axles laying around and thought it would be fun to have a toy that looked and preformed a lot like the real thing. My first attempts were with a drill press, coping saw, a dremal tool, some files, and a good dose of RCC. Here are a couple builds to familiarize yourselves with what I am talking about...

The birth of this idea...
Scale trans

Still have this one...sitting in a box
1:7th Suzuki Samurai trail build

Got frustrated with this one and sold it...
**2007 Bruiser**

Once again, frustrated that the "scale" was not there for me so I sold it...
Rock Racer

In post #29 of this thread you can see my first attempt at a scale drivetrain. This one also was sold when I became frustrated...
F-650 Trail/Hauling Rig

Anyway, you get the idea. Now that we have all the ugly past out in the open time to look to the future.

This was an attempt at scale from about a month ago. It was compact but looks like a toy gearbox...
Click the image to open in full size.

That lead to this...
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Now that satisfies my scale wants on a couple levels. First, it looks like something out of a 1:1, second, it has the correct amount of gear reduction, and third it is a 2 speed. Here are some shots of how it goes together...
Click the image to open in full size.

Top row from left to right. tail plate, shifter box, 2 speed box, bell house/actual transmission, bearing plate, and electric motor mount. Bottom row from left to right. Metric hardware, output shaft and gear, shifter gear, trans lower gear, 2 speed parts and some Axial XR10 gears that are in the transmission. Here are some assemble pictures...

Shifter box assembly...
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With the 2 speed setup and ready to go in the case...
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2 speed box bolted to the trans...
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All together...
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...and a little pimp'en...
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Transmission assembly in my next post
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Old 06-22-2011, 07:43 AM   #2
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The Axial XR10 gears are perfect for the main gear reduction due to the reduction that is possible in such a small space and toughness of all metal gears. Add those factors to ease of parts availability and it is a win win situation.

Picture of a gutless case...
Click the image to open in full size.

Gears installed...
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Bearing plate installed and ready for the motor...
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Motor installed on the motor plate and ready to mate to the trans...
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Ready to meet the motor...
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Motor trans mating in my next post
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Old 06-22-2011, 08:08 AM   #3
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Another annoying part of my scale builds is the fact you can see an electric motor. I want to see the V8 when I pop the hood or the oil pan when the truck is flexed out so I came up with this...
Click the image to open in full size.

Click the image to open in full size.

You can see where the motor plate mates to the block. Now, on to the block. There is a good reason that I actually machined the piston bores in the block. Once the complete assembly is in the truck the electric motor will be locked on a hot box. The biggest killed of electric motors is heat so I wanted to provide a way in which to circulate cool air around the motor. Plus, adds to the cool "scale" factor...

A little massaging of the block for air flow...
Click the image to open in full size.

Click the image to open in full size.

This should be a sit com, "Motor Meets Trans"
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Click the image to open in full size.

Ready for the heads...
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Old 06-22-2011, 08:13 AM   #4
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PayPal standing by...
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Old 06-22-2011, 08:16 AM   #5
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WHoly shit !!! That is awesome ! I can't wait to see the rest of this. What are the rest of your plans? Are you going to market this?
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Old 06-22-2011, 08:19 AM   #6
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WOW!........Awesome!
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Old 06-22-2011, 08:23 AM   #7
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Now the heads. Not only did I want scale looking heads but I needed them to functional in a way. The air will be brought in via the intake manifold and be vented out the exhaust. Yet again, cool scale factor to me...

Click the image to open in full size.

Click the image to open in full size.

On the block...
Click the image to open in full size.

...and in this shot you can see through the exhaust ports to the electric motor...
Click the image to open in full size.

A shot of it sitting between the frame rails of its future home...
Click the image to open in full size.

That is it for now. I will update this thread once I get the intake and oil pan done. I also need to post about the axles that are in the works and the t-case. Thanks for reading
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Old 06-22-2011, 11:14 AM   #8
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Reminds me of this build:

http://www.scale4x4rc.org/forums/sho...=51103&page=35
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Old 06-22-2011, 11:18 AM   #9
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Thats inf*kinsane, Whats this going to cost? and how much does it weight?
BEAUTIFUL.
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Old 06-22-2011, 11:26 AM   #10
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How many hours of programing time do you figure it has taken to get to this point?
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Old 06-22-2011, 11:44 AM   #11
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Quote:
Originally Posted by dont slow down View Post
Nope, that is looks to be WAY cooler then my build. I had never seen that before but I am going to go read the whole thing. Thanks for the link

Quote:
Originally Posted by stelerzman View Post
Thats inf*kinsane, Whats this going to cost? and how much does it weight?
BEAUTIFUL.
What will it cost? No idea. I am just trying to jump start my scale bug. As far as weight, right now it is about 22 ounces.

Quote:
Originally Posted by nigels_world View Post
How many hours of programing time do you figure it has taken to get to this point?
Goodness....I have no idea. I have notes and drawings from 2006 till now on the design. As far as time in SW and MC I would guess 100 hours or so.
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Old 06-22-2011, 12:34 PM   #12
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You've been talking about this for years! I love that you finally sat your ass down and did it. Can't wait to see the end.
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Old 06-22-2011, 12:53 PM   #13
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Quote:
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You've been talking about this for years! I love that you finally sat your ass down and did it. Can't wait to see the end.
Ya, shut hairball
























But ya, it is about 4 years late
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Old 06-22-2011, 01:23 PM   #14
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Quote:
Originally Posted by Eritex Inc. View Post
Ya, shut hairball
























But ya, it is about 4 years late
Just don't quit in it this time!! Fantastic work so far man. Maybe there is something in that SOMO water!
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Old 06-22-2011, 02:12 PM   #15
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Quote:
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Just don't quit in it this time!! Fantastic work so far man. Maybe there is something in that SOMO water!
Don't worry, I won't. I am having way to much fun with this build
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Old 06-22-2011, 02:22 PM   #16
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Wow, awesome!
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Old 06-22-2011, 02:34 PM   #17
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very very nice.......good things come to those that wait!!
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Old 06-22-2011, 02:36 PM   #18
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Quote:
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Wow, awesome!
Thank you. I consider it a huge compliment coming from you. This is the trans I was talking about back in '08 at The Scale Nats that kept blowing role pins. I fixed the problem about a year ago but never had the time to get back into the project.
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Old 06-22-2011, 02:52 PM   #19
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Crazy Always wanted to build something like that, but never had the time, knowledge, machinery or money.

Now rig up a small electric fan to look like a centrifugal supercharger to cool it.
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Old 06-22-2011, 02:58 PM   #20
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Quote:
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Crazy Always wanted to build something like that, but never had the time, knowledge, machinery or money.

Now rig up a small electric fan to look like a centrifugal supercharger to cool it.
Thanks. I already have the cooling fan covered. Hopefully I will have pictures soon.
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