Gallery, Projects and General > The Design Shop
An experimental engine
krv3000:
:nrocks: well dun can not wate til its dun
arnoldb:
Thanks Bob :beer: - neither can I!
Some more progress... eventually :lol:
Started off with the axle bushes. I'm out of my preferred phosphor bronze in the smaller size, so I used 7mm brass rod to make them. The first one took a bit of time to get the final sizes I needed, but then I just jotted down the cross slide readings and used that for the next 5 - which went quickly. Here I'm on the first one, with the final parting done to just below the 4.9mm diameter that it will be drilled out to:
Then a quick spot with the center drill, and drill out to 4.9mm, and the bush ends up on the drill bit. I find this more convenient to do than to first drill and then part off.
A little while later, I had all 6:
On one, I took the parting too deep... So it left quite a burr, but the 5mm reamer will easily take care of that later.
These were then pressed into the frames together with bearing retainer to make doubly sure they'd stay put, and set aside to cure a bit.
A block of hot-rolled flat bar was cleaned up, and accurately machined to make the frame spacer pieces from:
Some more machining and a little tapping later, I had the two spacers:
I actually made holes in the frames for a third spacer toward the middle, but things seem entirely rigid enough with just the two.
The first real "feel" of the frames coming together:
I then reamed the axle bushes out to 5mm with a hand reamer, running it through both bushes completely to ensure alignment:
Further work on the cylinders will be easier if they are split apart at this point, and I wanted to see how they fit on the outsides of the frames, so I slit them apart:
The bottom cylinder is not getting clamped on the studs; I shoved a T-piece between the studs so the vise could clamp down through it on the valve cover plate.
With the cylinders fit to the frames, I did a quick mock-up to see if things will look OK. The frame is resting on some blocks on the track at about the height it will be once the wheels are fit to the chassis, and the aluminium stock lying on top is approximately the same size and in the same position the boiler will go after getting some cladding added to it:
Some more size comparison with Fred:
Things look about right to me :D
This boiler would definitely be too big ::):
Not as much progress as I'd hoped for up to this point, but some is better than none!
:beer:, Arnold
NickG:
Nice 1 arnold, it looks good and I will have to remember the parting trick for the small bushes. :thumbup:
Dean W:
Shoot, I missed a whole bunch of this thread, Arnold. Good thing we have the forum so I can catch up!
It's coming together well, and looks like you're going at a good clip. (Seems that way when you read the
whole thread in one day, at least!) ; )
Keep at it, and thanks for the thread!
arnoldb:
Cheers Nick :beer: - it works a treat, but only if the bushes can be reamed out afterwards.
Thanks Dean :-) A bit like I saw on Discovery Channel just now on "How do they do it" about a crowd making "Garden" locos then - Takes them 10 minutes flat if you believe the program :lol:
:dremel: Managed to squeeze an hour in the shop after work today.
Skimmed off a bit of hot-rolled bar to 30mm diameter:
I then drilled a 4.5mm hole deep enough into it to allow for 6 wheels and parting space.
Then, with the QC toolbit swung over to the correct angle for the flange, the first wheel rim was turned down to 28mm, and a note taken of the cross slide reading to get the others to exactly the same size. Then I started parting off the first wheel:
The others soon followed - two of them "blind" - i.e. without wheel flanges; these will become the center wheels; I found that it is relatively common in this size of locomotive to do this, as it allows locos to negotiate tighter curves. The six wheel blanks awaiting further machining:
Like I said earlier in this thread, changing that worn V-belt on my lathe really made for much easier parting off - I can't believe I waited so long to replace it!
:beer:, Arnold
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