steam engine with 40 mm bore

[Michael S.]

Yes Chris, I think I don't need a crane eyelet. 😁

[Admiral_dk]

Looks like you are off to a good start on this buil Michael   


Per

[Michael S.]

Bronze and iron came in the mail yesterday. That's when I started with the bronze bearings. It's a shame that so much of the expensive stuff turns into chips again.
I thought Chris' idea was great and finally separated the bearings. The compensation comes later with 0.40 mm brass strips.
The final measurement was made with the adjustable reamer. That smoothes out the hole. The crankshaft is made of 17.00 mm silver steel.

Greetings Michael

[crueby]

Beautiful bearings!   
How did you cut the diagonal oil channels on the inside?
 

[Michael S.]

The bearings got screws. These are M 5 bolts and fortunately I had nuts that are not galvanized. The crank is a cast part and was machined in the lathe and milling machine.
I was able to make the fit so I could press the crank onto the shaft.
Tomorrow the flywheel will be on and I noticed while cleaning with the file that there were hard spots.
Since no big noise is allowed to be made tomorrow on Sunday, I went over it with the Flex today.
Let's see how it turns out tomorrow.

Michael

[Michael S.]

Hi Chris, I did that with the Proxxon (Dremel) and a small diamond disc. It fit well in the bowl.

Michael

[Kim]

Great work on the bearings and crank, Michael! 
Kim

[Zephyrin]

These are M 5 bolts and fortunately I had nuts that are not galvanized.

a short stay in dilute hydrochloric acid will remove this ugly Zn coating...but nuts easily rust after that!
no simple ways to remove the stamped marks of the classe grade on the head of bolts !

very nice thread, thanks to share!

[fumopuc]

Hi Michael,
I do like your outdoor bench with vice very much.
Very useful.
My neighbors here would kill me.
I have a bench in my car port too and during the last 20 years I haven seen 2 times the cops visiting me, after 5 minutes working with a grinder.
So, it is a very special neighborhood.

[Michael S.]

Incidentally, Jasonb has a very good archive and found a report in a German magazine "Das Dampfmodell" from 1990 about a Max Dörfel steam engine. At that time the author bought the inheritance of a mechanical workshop and there were castings, drawings and a finished machine.
He finds it amazing that round head screws and some inch threads are used here. But that was still common in Germany for a long time. (And that's still the case with plumbers today)
Only the 25 mm machine is mentioned in the report.
With around 40 issues, the magazine "Das Dampfmodell" was the best magazine on the subject of model steam engines. Unfortunately, there hasn't been for a long time.

Michael

[Michael S.]

Machining the flywheel on the lathe went better than I thought. First drilled the hole and machined two sides and flipped and realigned the flywheel. That's it.
The crankshaft got a groove for a wedge and I made the groove in the flywheel with 4 saw blades tied together and adjusted it with a file. The flywheel must be brought into position with light blows of the plastic hammer. A worm screw secures the wheel.

Greetings Michael

[Kim]

Flywheel looks great, Michael! 
Kim

[crueby]

That came out great!   

[vtsteam]

Nicely worked! 

[Michael S.]

Thanks Kim, Chris and Steve