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Author Topic: 1:35th TACL rail tractor  (Read 3839 times)
Bernhard
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« Reply #30 on: July 03, 2020, 02:15:02 AM »

Let's continue with the running gear of the rail tractor.


* TACL 020.JPG (75.5 KB, 839x809 - viewed 35 times.)
« Last Edit: July 03, 2020, 02:16:42 AM by Bernhard » Logged
Bernhard
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« Reply #31 on: July 03, 2020, 02:15:49 AM »

The wheel bearings of the prototype are cast.
(Photo by Ben V.)


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Bernhard
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« Reply #32 on: July 03, 2020, 02:16:23 AM »

Since I can't mill the form this way, I make the wheel bearings from two parts, which are soldered together.
As always with such parts, I first mill a profile with the appropriate cross-section.


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Bernhard
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« Reply #33 on: July 03, 2020, 02:17:09 AM »

Then the hole for the axle is drilled ...


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Bernhard
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« Reply #34 on: July 03, 2020, 02:17:42 AM »

... and finally the wheel bearing is cut off with the circular saw blade like a sausage slice.


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Bernhard
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« Reply #35 on: July 03, 2020, 02:18:21 AM »

The four complete wheel bearings are then assembled from the individual parts.


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Bernhard
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« Reply #36 on: July 03, 2020, 02:18:51 AM »

The wheel bearings can slide in the guides just like the prototype.


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Bernhard
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« Reply #37 on: July 03, 2020, 02:19:22 AM »

In my leftover box I found suitable springs and shortened them to the right length. The ends are grinded, then I made them glowing with the soldering torch and put them cleanly on the last coil.


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Bernhard
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« Reply #38 on: July 03, 2020, 02:19:51 AM »

Now, with the help of a jig, the three axles are mounted on the frame at the correct distance and exactly parallel to each other.


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Bernhard
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« Reply #39 on: July 03, 2020, 02:20:20 AM »

And then the vehicle stands on its own wheels for the first time.


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Bernhard
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« Reply #40 on: July 03, 2020, 02:20:50 AM »

The rail tractor has an interesting drive concept:
Two chains lead from the rear axle of the Fordson to an intermediate shaft. From there the drive is transmitted to the rear axle either via two sprockets or via a chain. A clutch can thus be used to switch from forward to reverse drive.
The rear axle then drives the front axle via another chain.


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« Last Edit: July 05, 2020, 01:59:59 AM by Bernhard » Logged
Bernhard
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« Reply #41 on: July 03, 2020, 02:21:48 AM »

Unfortunately, there are no working scale roller chains for 1:35th scale. Therefore I had the chains etched. Three plates per chain are glued together.


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Bernhard
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« Reply #42 on: July 03, 2020, 02:22:25 AM »

The hubs of the sprockets are mounted as separate turned parts.


* TACL 034.JPG (226.19 KB, 879x433 - viewed 54 times.)
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Bernhard
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« Reply #43 on: July 03, 2020, 02:23:17 AM »

And this is what the finished drive looks like from below.


* TACL 035.JPG (227.56 KB, 765x533 - viewed 58 times.)
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Bernhard
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« Reply #44 on: July 03, 2020, 02:24:12 AM »

The chain guard boxes are still missing. For weight reasons, these are not made of brass, but of plastic.
The outer form is milled on the rotary table.

Bernhard


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