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  #21  
Old 10-08-2016, 02:59 PM
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Not happy with this one

Plan to try again this evening.

Don
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  #22  
Old 10-08-2016, 03:13 PM
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airdave airdave is offline
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I've built this thing twice now.
Both times, its not perfectly straight.
Those side tubes are very small and hard to get perfect.
Once all the other stuff is attached, you won't notice it.
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  #23  
Old 10-08-2016, 04:34 PM
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Next step...

I think the Suspension is one of the trickiest areas of the build...
the Suspension parts are small and need to be folded and attached correctly.

The wheels and fenders are attached to the chassis using A-frame "control arm" pairs.
The paper model parts combine the upper and lower control arms into one assembly.
We'll refer to the pair of control arms as the "control arms".

Make sure not to mix up the front and rear "control arms".
And remember which side is up. (The glue tab attaches to the underside panel of each control arm assembly)

Each control arm is scored to fold at four lines.
Once again, its important to be precise with your scoring and folding.



...

Note the angled lines (on the model sheet) next to each pair of control arms.
This line is a profile of the chassis/control arm shape, showing you the downward control arm angles.



...

Cut out one of the control arms.
You should use a knife and a straight edge to cut out the part precisely.



...

Now fold the part into the correct shape and glue the underside panel using the glue tab.
The overall shape is not a box...but more of a parallelogram. (angled box).
This shape is important to create the downward angle of the control arms.
The downward angled control arms will raise the vehicle up, giving it "ground clearance".






...

The control arms attach to the chassis at the marked locations.
They just glue flat to the sides of the box rails.
There are also circle locators at the mounting locations...line those up...
to make sure you don't mix up the right and left control arms.

The control arms will hang a little below the box rails...thats okay.
Just flush up the top edges.



...

Heres a view across the front showing the downward angle of the control arms.
It needs to be even side to side...thats most important.

I think the intended design (as per the line diagram) is a bit excessive.
But the vehicle does need ground clearance.
So, angle those control arms down as much as possible.



...

And, a full view of the chassis...from the topside...with all control arms installed.



...

Another view of the completed chassis from the underside.



...
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  #24  
Old 10-08-2016, 08:01 PM
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Amccombs3 Amccombs3 is offline
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Yay, I'm caught up. The iPad was very sick, but pulled through the major operation (an evening at the Apple store and several hours of reloading itself) and is now working again. It works out well to have the instructions sitting right there on the workbench next to the project. No pictures tonight, the chassis wants to twist and is spending the night under a weight that clears all the suspension arms. But I'm happy with how it's going so far. Lots of good practice on small parts.
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  #25  
Old 10-08-2016, 08:17 PM
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Back when I did this model, this was the set of parts I was most worried about, so I hit them with a little superglue to make them more rigid
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  #26  
Old 10-09-2016, 01:41 PM
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Catching Up

Suspension parts cut out and shaped (Images 1 and 2). The machinist blocks are sitting on top of my first cut at the chassis in a desperate attempt to unwarp it. Didn't work.

Image 3: My second attempt at a chassis is the one on the right. Not perfect, but somewhat more dress-right-dress than the first one and it pretty much lays flat.

Image 4: Suspension parts attached. The joins are a little rough because I discovered I had glued them on backwards and had to peel them off and re-glue.

Ready for the next step.

Don
Attached Thumbnails
KoolWheelz Tutorial Build - Lunar Rover Racer-airdave_tutorial_lunar_rover_06.jpg   KoolWheelz Tutorial Build - Lunar Rover Racer-airdave_tutorial_lunar_rover_07.jpg   KoolWheelz Tutorial Build - Lunar Rover Racer-airdave_tutorial_lunar_rover_08.jpg   KoolWheelz Tutorial Build - Lunar Rover Racer-airdave_tutorial_lunar_rover_09.jpg  
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  #27  
Old 10-09-2016, 02:05 PM
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airdave airdave is offline
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I think you guys are worrying a bit too much about how straight
or level your chassis are.

Sure, I'm instructing you to make folds as precise as possible,
and attach those control arms at the correct angle...
but thats only to avoid a ridiculously twisted model.

Lets face it...this is a miniature scale model made from paper.
Its not gonna be that accurate.

Once all the parts are attached, you'll never notice that warped frame.
Just look at mine as proof! lol
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  #28  
Old 10-09-2016, 02:10 PM
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Don Boose Don Boose is offline
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Point taken, but I am glad I made a second chassis. It was good practice, it came out better, and I feel I have a good start for the rest of the build.

These tutorial builds have really been fun and have improved my building hand skills.

Many thanks for taking all this time to work us through the builds, Dave.

Don
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  #29  
Old 10-09-2016, 02:28 PM
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airdave airdave is offline
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I have to admit...it is a lot of work.
I wasn't looking forward to having to build some of these KoolWheelz models for a second time.

I really have a problem with doing anything twice
...I used to hate getting airbrush jobs that required me to duplicate something.
Like multiple Tee shirts or the second side of a motorcycle gas tank.
For some reason, I put all my effort into the first go, and thats it, I don't want to do it anymore.

But, the model building turned out to be the least of my worries.
Its the taking of so many photos...editing them all...making notes...
creating the copy for the posts...uploading photos...
and then making two sets of posts (at two different forums)
and trying to stay two steps ahead of you all.

It has turned out to be a very time consuming project.

But...don't take my comments the wrong way...I still love the idea of it all.
I like the self promotion and the tutorial aspects.
I like that people are following along and taking part.
I'm glad we started this.


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  #30  
Old 10-09-2016, 03:20 PM
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Wad Cutter Wad Cutter is offline
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Super Dave I'm glad as well that you take the time to go over each step and don't mind a question on the way. Thank very much. wc
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