LANZ Bulldog HL12 (1923) scale 1:4,5

[ZAPJACK]

Dear all,
I will show you the building of my last working model.
The castings and drawings are coming from Italy (Thanks to Emidio)
It’s based on a very popular tractor between WW1 & WW2
The engine is a “hot bulb“two stroke semi-Diesel.
Low compression (5:1) and reed-valve intake (air only)
Heavy oil injector and injection pump. The “hot-bulb“work a little bit like glow ignition.
The model is a regular two stroke engine with spark plug and carburator.
Dr. Ing. Fritz Huber was the designer of this technology.
LANZ factory of Mannheim was purchased by JOHN DEERE in 1956
The factory still produce JOHN DEERE tractors today.
enjoy
LeZap

 

[ShopShoe]

ZapJack,

Thank you for posting that. Is your model running so that you can make a video for us?

I have been enjoying the Youtube videos of the full-size Lanz Bulldog tractors, so seeing your model is also interesting.

Thank You,

--ShopShoe

 

[Herbiev]

Nice work. I'd also love to see a video.

 

[ZAPJACK]

Video will coming soon.
The most difficult think when machining a casting is to find a reference surface. This are the tractor body and the crankcase.
After this first step, several size checks are needed
LeZap

 

[kadora]

Hello
Does Mr Emidio from Italy sell Lanz castings?
Thank you

 

[ZAPJACK]

This is the cylinder head machining. The spark plug hole.
Other is the first blank monting
LeZAp

 

[Swifty]

Looks like a very nice set of castings, I'm following with great interest.

Paul.

 

[ZAPJACK]

This is the fuel cap. where is original and model?
Machining the cylinder head.
Conecting rod mounted with pin bearing
LeZap

 

[ZAPJACK]

these are the bearings of the cranckshaft.
And cast iron raw crankshaft.
LZ

 

[ZAPJACK]

This are the pictures of the construction and assembly of the cranckshaft
Assembly with strong Loctite and loocking pins.
LeZap

 

[ZAPJACK]

Nothing special in the machining of cylinder in cast iron.
Std aluminium piston
LeZap

 

[offchopdarwin]

keep the good work rolling

 

[ZAPJACK]

Machining the flywheels are difficult job.
at first because it was to large for my lathe. Fixing parts was very close to the frame of the lathe.
To avoid runout, several checking was necessary. (with Pupitast)
Than, copy the conus of cranckshaft and polishing shaft.
LeZap

 

[ZAPJACK]

This is the blank mouting of the crankshaft, connecting rod, piston and the two flywheels. The second one is the side of the clutch.
You will see the typical two stroke piston with his deflector.
The clutch is very complicated to build because there is a lot of very smal parts. It's a little bit like a centrifugal clutch.
LeZap

 

[ZAPJACK]

Still the clutch with very small parts:fan:
LeZap

 

[ZAPJACK]

These are all the parts of the clutch + mouting of all.
Clutch lever machined from bar stock
LeZap

 

[Herbiev]

Looking great so far

 

[ZAPJACK]

Machining the wheels
LZ

 

[ZAPJACK]

This are the rear axle with the adjustable arms.
unusual differential system and primary drivind pinion
LeZap

 

[johnmcc69]

Wow, those are some intricate & small parts. Very nice work! Thm:

John