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  #71  
Old 04-24-2019, 12:07 PM
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airdave airdave is offline
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Finally!...moving on...
the Hitch hook is sorted!

Almost twice the size, and redesigned shape.
Assembly of the main hook, is a boxed construction now...
but with the side panels thickened up to create a small step to edge glue the central/outer strip.
Some pre-shaping is required, but once you get that done, it falls into place quite easily.

I glued one side first, and then easily fitted the opposite side.

The swiveling locking bar, above the hook, I deliberated shortened, so that it would not interfere with the Trailer hitch.
I think its too small to create an actual swivel bar, so shortening it was the best option.

The 3 upper parts are laminated and then grouped/glued together.
Only 1mm for each part...but this area does require careful cutting and edge colouring.
Just too small for an edge strip in my opinion.

I also double layered the mounting plate and changed its design a little.

Much improved...I am much happier with this design!

My edge colouring is really poor...I tried a new ink marker that looks good going on...but later goes very brilliant green
It especially showed in the photography...so I admit, I shopped out the colour a bit.

Now I can refocus on the drivetrain!





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  #72  
Old 04-24-2019, 06:15 PM
missileer missileer is offline
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Very nice looking hitch!
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  #73  
Old 04-25-2019, 04:22 AM
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That's a lot of design for a small part 🙀 Great attention to detail.
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  #74  
Old 04-25-2019, 06:42 AM
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Don Boose Don Boose is offline
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An elegant solution.

Don
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  #75  
Old 04-25-2019, 07:23 AM
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airdave airdave is offline
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Quote:
Originally Posted by gotham View Post
That's a lot of design for a small part 🙀 Great attention to detail.

haha thats exactly what I was thinking!

here I am trying to dumb this thing down, and yet, I keep making things more complicated! lol

actually, its extra parts (just for the Hitch) but it all went together simply and quickly.
only thing that took any time was assembling the hook itself, and even that wasn't difficult.

I guess some things will require a more complicated approach if they are to look right.
This hitch is far from a perfect match to the real thing, but it should function.
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  #76  
Old 05-07-2019, 02:36 PM
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Time to catch up with my reports...
lets pick up where I left off...

with the help of some fellows over at the Maple Leaf forums
I figured out the basic shape and positioning of the central Transfer Unit.

In case you don't know, the Transfer Case/Unit is driven directly off the Transmission Driveshaft
and splits the drive for front and rear Driveshafts (4 wheel drive).
In this case, the Gun Tractor also has a large powerful Cable Winch system
which also directly driven from the Transfer Case (Power Take Off).

Obviously I am going for a simplified and stylized assembly, but it helped to understand
the basic shape and size of the cast metal Unit, and how it mounts in the Frame.



...
You can see (below) the Transfer case mounted in the upside-down Chassis.

There are two mounting blocks (triangular)...one hidden...mounting the Transfer Case.
And a bracket has to be installed under the cross member
As long as everything lines up, this is working well.



...
With the Transfer unit in place, I loosely placed the front and rear Axles and checked the alignments
with some wooden sticks and toothpicks.
All looks good!



...
Since the Tow Winch Drive Unit is already installed in the Chassis, its the first thing I will connect.
Its also the closest Drive unit and is directly inline...so the driveshaft connection is important.

Figuring out how to represent these Driveshafts, in paper, at this small scale, was a challenge of its own.
The tubes are all quite narrow, and difficult to roll cleanly.
Trying to simplify the design wasn't as obvious as it seems now.

This is the Tow Winch connection, which is a short shaft and a series of plates and connectors.
A bunch of layered parts will have to fill in for all the bolts and bushings and spacers and plates.

One thing of note...the long shaft(tube) is now changed to a very short shaft(tube).
I found it was unneccesary for the Transfer Case to have holes right through.
It serves no purpose to have long tubes fitted through the Case, so I have since changed the design.



...
Around this time in the construction, I got some info from a Quad F-AT owner
about the chassis attachments at the rear for the Tow Cable.
Seems my Guide pulleys were a bit over scale...
and I did not know about the second mounting plate underneath the Pulleys.

I was also shown where the cable guide rollers were fitted...called "fairleads"...
so I was able to include a very simple and stylized part for that too.
Its supposed to be two rollers mounted between end plate brackets.
But things are too small (at this scale) to create actual rollers and the bracketry, so I went for a boxy thing.
Its well hidden anyway.

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  #77  
Old 05-07-2019, 02:37 PM
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Its time to permanently mount the front and rear Axles.
And I decided to add some straps to mount the axle tunes more securely in the shackles.
Its an optional part, but it gives you more gluing surface.

You also notice in this next pic, the Yolk installed into the Differential housing.
This is the trailing end of one of the Driveshafts.
I decided it would be better to assemble and install these Yolks into the Differentials
and Transfer case, before the Driveshafts go in.



...
Trying to simulate the Universal Joints for the Driveshafts was another challenge.
At this scale, the parts are very small...and the driveshafts need to have flexible joints.
But trying to create working universal joints was impossible.

I scaled up the driveshaft tubes to make them a little easier to build.
But they are still very narrow tubes.

I eventually came up with a simple idea for the flexible Joints
...starting with the Yolk assembly as shown in the previous photo.
There are some very small parts to assemble...but its not a complicated assembly.

And...with the Yolks installed...the driveshafts drop into place with no actual connection.
The ends of the driveshafts are just U-shaped parts that fit over the Yolk parts.
Its a deceptive look...there is no "joint" there at all.
I got everything into the right position, and then put in a few blobs of glue to lock it all together.



...
With all the handling, I found that I did not glue the Wheels to the Hubs very well.
And things came loose in various places.
I've had to cut parts off and reglue them.

Hopefully this last time was the charm...I'll have to make a note in the instructions
to make sure you glue the wheels securely!

So this is where it is...next up will be the Engine and Transmission.

But first, I want to focus on the assembly instructions and get the diagrams done (up to this point).
Its a lot of work, but I have learned not to leave it until the end of the project!



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  #78  
Old 05-07-2019, 02:38 PM
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Don Boose Don Boose is offline
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A truly beautiful undercarriage.

Don
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  #79  
Old 05-08-2019, 12:25 AM
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Looks good as it is.
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  #80  
Old 05-08-2019, 06:17 AM
Tom Lapinski Tom Lapinski is offline
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Enjoy following your design builds. Great job!
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