TT-Tracks

Re: TT-Tracks

Postby RodTT » Tue Apr 30, 2019 4:04 am

Bill Dixon wrote:Not up to much recently.
This is what I am working on now.
20190429_full car.jpg

[
20190429_one truck.jpg

Wow! Have you scratch-built the body shell?
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Re: TT-Tracks

Postby Bill Dixon » Tue Apr 30, 2019 11:32 am

RodTT wrote:
Bill Dixon wrote:Not up to much recently.
This is what I am working on now.
20190429_full car.jpg

[
20190429_one truck.jpg

Wow! Have you scratch-built the body shell?

That is a HP body on new resin trucks.
You have to build a proper bolster for the trucks, but so far it looks good.
Regards
Bill Dixon
TT-Tracks
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Re: TT-Tracks

Postby dileTTante » Tue Apr 30, 2019 5:03 pm

The trucks I assume are from the metal castings from my Harmon kits.
So --
What size wheels are you using (you showed me that the ones in the Harmon kits are too small) ?
Are more resin castings available? And what price?

- Terry C
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Re: TT-Tracks

Postby Bill Dixon » Tue Apr 30, 2019 8:13 pm

dileTTante wrote:The trucks I assume are from the metal castings from my Harmon kits.
So --
What size wheels are you using (you showed me that the ones in the Harmon kits are too small) ?
Are more resin castings available? And what price?

- Terry C

They use 36" Fox valley wheel sets. I have a stock of them.
This is the first set out of the moulds.

Did my first attempt at installation last night on a car.
They need a bolster to get the body up to the right height for the couplers.
Made one out of .060" Styrene bits.

The traps I have found so far on installation:
The black center sill is not necessarily centered. The centre of it also needs to be glued down.
The old truck holes in it are not necessarily in the right position for the trucks to pivot clear of the the body side skirts.
I used the position of the sill and the hole in it to position the trucks. I think one truck is offset to one side, and the other is too close to the skirts. Happily I am working in Styrene so it will be easy to move things.

If time permits tonight, I have a few other MUST DO projects tonight, I am going to fiddle with the mounting.
Then I will paint the side frames Aluminum and weather them.
Going to see how the car runs on the reverse loops.

The trucks should be $5.00 plus wheels.
How many do you want?

On another unhappy note, my van is sucking a chunk of change out of my discretionary budget tomorrow AM. In the shop now. Unfortunately a Must do fix. Going to delay a project or two.
Regards
Bill Dixon
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Re: TT-Tracks

Postby ConducTTor » Wed May 01, 2019 3:52 pm

Can't wait to see the finished model! And I'll take some truck sideframes as well. 7 sets pls :)


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Re: TT-Tracks

Postby ConducTTor » Wed May 01, 2019 4:43 pm

Actually, cancel that - I need to take stock of how many cars I have first. Doh!


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Re: TT-Tracks

Postby Bill Dixon » Sun May 19, 2019 1:45 pm

I have been thinking about our turn back loops.
They do work but are too tight a radius, bulky and heavy.
I can rebuild them to one radius larger but that is a lot of work for not much return.

So I went off on another track. What would it take to get at least an R6 curve?
2019 New End Loop..jpg

It turns out that you need a four foot wide module, bigger that we currently have.
So how to build this module. To keep the sizes down you could make five two-foot square modules. These have the problem that on two foot wide tables, half of the module overhangs the table and you have to figure out how to join them together. The unijoiners won't be enough.

How about three modules?
2019 New End Loop 1..jpg

Two of these end up being four feet long. From past H0 modular experience, a four foot module is about 30 pounds. However in those layouts the module had to be strong enough to handle the compression and expansion strain of being in a big display and also allow for the mounting of legs. We are going to be sitting on a table top at the end of a display so the module does not need to be that strong and can be much lighter.
A two inch slab of insulating foam with door skin glued to the edges would be strong enough. A single pair of unijoiners won't be enough to hold these together. Rather than design a complex mechanism, a couple of pairs of dummy connecting tracks with unijoiners may be enough. The diagonal connection is designed to be a BG1 straight piece of track.
The four foot modules are larger than our current loops, but would be light enough that they could ride on top of anything. The current loops are bulky and have to be on the bottom because of their weight.
Time to do some more doodling.
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Re: TT-Tracks

Postby dileTTante » Sun May 19, 2019 5:02 pm

Here are possible arrangements which eliminate one of the reverse curves, if using an extra table is acceptable. Second version is easier on equipment and portions of it could be straight modules. It takes more space but can be considered as merged somewhat into main layout. It would allow longer trains (but so would yours with R6 compared to originals). The images are crude because I just chopped up the original and re-arranged the bits.

- Terry C
Attachments
reverse loop dream A.jpg
reverse loop dream B.jpg
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Re: TT-Tracks

Postby CFRiad » Sun May 19, 2019 5:28 pm

Bill Dixon wrote:How about three modules? [...] Two of these end up being four feet long. [...] A two inch slab of insulating foam with door skin glued to the edges would be strong enough. [...] a couple of pairs of dummy connecting tracks with unijoiners may be enough.

There's potential here.
Can the dummy tracks be on the bottom or sides? Can we eliminate the empty space in the middle?
HoleInTheMiddle.jpg

Terry's teardrop shape reduces the reverse curves somewhat. It's worth looking into further.
TearDrop.jpg

And we should design/build these with acrylic hand barriers from the get-go.
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Re: TT-Tracks

Postby railtwister » Sun May 19, 2019 9:46 pm

A couple of fairly large (at least 3/8” dia.) dowels for alignment, plus a couple of neodymium magnets to hold the modules together is another possibility if you have concerns about the holding ability of the unijoiners. Keep in mind that the HO T-Trak modules are quite a bit larger than the N scale ones, but all the unijoiners are the same size, no matter the scale...

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