Triumph Tr6, 3d printed large scale

[François]

Yesterday I said that I would not be making a real differential, well I lied. I decided to try and see if it could work. So today, I designed the internal components that makes a differential do what it does which is to drive both wheels while permitting the wheels to rotate at different speeds. It's a beautiful feat of engineering invented back in 1827 by a French guy named Pecqueur.

I also redid the half shafts with more accurate universal joints along with the drive shaft. I incorporated the small bearing (which I received today and boy, are they tiny) in the front hubs. I had to find slightly larger bearings for the differential, I went with 4mm id instead of the 3mm id used in the hubs.

Redesigned half shafts

Differential internal bits

Working differential (in cad at least)

View attachment 20251117_194827.mp4

 

[François]

With the differential done, I'm slowly progressing back towards the front of the car. I did the rear brakes and started the transmission housing. It's composed of 3 parts. The tail housing, the bell housing and the shifter housing. Having restored this car for real, l have a ton of literature. One of these books (the tr6 maintenance book) is full of really nice hand made 3d drawings (remember that it dates back to the pre-computer era) and some just as nice cross section views. There's one of the transmission that I used to 3d model it. Combined with pictures from the net and measurements from my car, I was able to do a decent job of it. It's not finished but not to far either. I still have the complete shifter housing to do. On the hydra, I made a mecanism activated by the shifter to engage the rear wheels but it didn't work well. For this one, I would like to make the actual friction clutch and engage it using the shifter instead of the clutch pedal.

Cross section from maintenance manual

3d model of transmission so far

the transmission from my car after it was restored

And the rear brakes

 

[Marquinius]

Ehrmh … you will sell this to Tamiya or so? I mean … oh well. Just impressed beyond normal levels.

 

[MisterCA]

Amazing!!! Incredible work.

Below is a picture of the TR 6 prediceser. The American import called the TR 250 built only one year in 1968..

 

[François]

Wow, the 250 was the nicest of all TR'S.

For those of you who work with computers, you know that eventually something will go wrong. Well something did go wrong will my bell housing 3d model. After close to 8hrs of work, the file decided to become corrupt and could not be opened anymore. It's a very complex part to do so redoing it wasn't all that fun. The good side of this is that it went faster the second time around and that I'm more pleased with the result.

Bell housing V2. You will notice that the gearmotor has been placed where the starter motor normally is. Being a 1/6 scale model, I should have enough space inside the starter housing to hide the gearmotor.

I also started work on the engine, I did the pistons.

On a lighter note, I went to a model show last Saturday and picked up 3 prize. I brought the Hydra Coupe and the bentley blower. Both cars were in different categories which had close to 30 entries each. The bentley won first place in the 1970 and older cars segment while the hydra won first place in a movie vehicle themed segment. Plus, the Hydra won best of show!! It was a nice day.