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Re: bambuko loco works 0-6-2 (Fowler)
Posted: Mon Aug 20, 2018 8:02 am
by dewintondave
I had a sheet of 1.6mm and 0.6mm CRS guillotined into handy sizes by my local stockist. I have a lifetime supply
. 0.6mm is perfect for bodywork and solders nicely.
Re: bambuko loco works 0-6-2 (Fowler)
Posted: Mon Aug 20, 2018 12:54 pm
by bambuko
As I know very well
from following your Hunslet build thread.
I also agree with you that there is no point using brass sheet where steel will do perfectly nice
and much cheaper as well.
Weather is still crappy here, so off to the workshop...
Re: bambuko loco works 0-6-2 (Fowler)
Posted: Mon Aug 20, 2018 4:21 pm
by GTB
bambuko wrote: ↑Sun Aug 19, 2018 3:55 pm
I am guessing GBT that you are talking about black stuff, which is indeed a bitch to de-scale.
Yes, as you surmise, the only HR I can get in small sheets is in black sheet form.
The HR grade I use is HA1 and it's CA2S-E for the CR. Those are AS/NZS general purpose grades, I've no idea what they'd be called anywhere else.
Some HR grades are available in pickled and oiled form, but I've not found any local supplier that sells it in small quantities.
About all I use HR for is loco frames and since they are flat I usually descale them with a flap wheel sander. That leaves a smooth surface that doesn't rust as fast as the porous surface left by descaling with acid.
Regards,
Graeme
Re: bambuko loco works 0-6-2 (Fowler)
Posted: Wed Aug 22, 2018 4:25 pm
by bambuko
Bit more progress.
Hornstays are now fitted:
Next axleboxes...
Re: bambuko loco works 0-6-2 (Fowler)
Posted: Wed Aug 22, 2018 7:59 pm
by Big Jim
Wonderful bit of work and great progress.
Re: bambuko loco works 0-6-2 (Fowler)
Posted: Wed Aug 22, 2018 9:56 pm
by Hydrostatic Dazza
bambuko wrote: ↑Wed Aug 22, 2018 4:25 pm
Bit more progress.
Hornstays are now fitted:
Next axleboxes...
Super.
We award you Australia's highest award, the Koala stamp.
Keep the pictures coming.
Re: bambuko loco works 0-6-2 (Fowler)
Posted: Thu Aug 23, 2018 10:49 am
by bambuko
Hydrostatic Dazza wrote: ↑Wed Aug 22, 2018 9:56 pm
...We award you Australia's highest award, the Koala stamp...
I am honoured
Can't wait to get it on it's wheels. Until I know that my suspension/equalisation works, it is just an experiment
that might turn out to be training exercise. One thing is for sure - the lessons learned will be worth it for future designs!
Re: bambuko loco works 0-6-2 (Fowler)
Posted: Thu Aug 23, 2018 9:26 pm
by Hydrostatic Dazza
bambuko wrote: ↑Thu Aug 23, 2018 10:49 am
Hydrostatic Dazza wrote: ↑Wed Aug 22, 2018 9:56 pm
...We award you Australia's highest award, the Koala stamp...
I am honoured
Can't wait to get it on it's wheels. Until I know that my suspension/equalisation works, it is just an experiment
that might turn out to be training exercise. One thing is for sure - the lessons learned will be worth it for future designs!
If it does not work, and there is no reason why it will not, one will just have to lock it all up and then it becomes cosmetic. No matter what, it will look cool.
Re: bambuko loco works 0-6-2 (Fowler)
Posted: Sun Sep 16, 2018 12:22 pm
by bambuko
Not much progress in the workshop.
I am spending most of the time at the moment finishing CAD design, particularly valve gear.
In the meantime, here is a test of screencast from CAD for your amusement:
https://screencast.autodesk.com/Embed/T ... 78?t=0m00s
Entertainment value aside
, clearances are tight and it helps to check everything before cutting metal
Re: bambuko loco works 0-6-2 (Fowler)
Posted: Sun Sep 16, 2018 12:24 pm
by tom_tom_go
That's a great way to go about designing a loco.
It must be rewarding seeing it all work in CAD knowing all the measurements and tolerances are correct.
Re: bambuko loco works 0-6-2 (Fowler)
Posted: Sun Sep 16, 2018 1:21 pm
by bambuko
Yes indeed
ttg,
but CAD is cruel mistress as well - it doesn't tolerate "near enough"
What is taking all this time, is that I am not "modelling" in CAD, I am designing in "CAD",
so... if there was an existing design on paper, it would take no time to create the model (assuming that paper design "added up" in the first place - a lot of them don't
)
Because I am designing "my own", often I end up, in some direction, only to find that something interferes or doesn't work for practical reasons,
so back one goes and things get re-arranged (only to find another problem...
)
All great fun
Re: bambuko loco works 0-6-2 (Fowler)
Posted: Sun Sep 16, 2018 9:35 pm
by Hydrostatic Dazza
bambuko wrote: ↑Sun Sep 16, 2018 1:21 pm
Yes indeed
ttg,
but CAD is cruel mistress as well - it doesn't tolerate "near enough"
What is taking all this time, is that I am not "modelling" in CAD, I am designing in "CAD",
so... if there was an existing design on paper, it would take no time to create the model (assuming that paper design "added up" in the first place - a lot of them don't
)
Because I am designing "my own", often I end up, in some direction, only to find that something interferes or doesn't work for practical reasons,
so back one goes and things get re-arranged (only to find another problem...
)
All great fun
Hear Hear
Re: bambuko loco works 0-6-2 (Fowler)
Posted: Wed Dec 19, 2018 8:05 pm
by bambuko
At long last... bit of an update.
As mentioned before I wasn't all that happy with the first attempt.
My brazing was dodgy, frame ended up a bit wonky and having real thing in front of me (rather than CAD image) made me change some of my ideas.
So everything you've seen so far ended up in a scrap bin and I started again.
This time I have used SIFBRONZE No101 (instead of No1) - added managanese makes it flow better, especially in the kind of joints I am using.
I have also decided not to braze all frame stretchers, only brazing front and rear buffer beams (as per original LBSC advice).
This is the result:
All the stretchers are secured with bolts.
I have decided to move to metric - selection available from
https://ghw-modellbau.de was just what I wanted.
I have used mostly 1.4mm 2mm hex bolts and some 1.6mm 2.5mm hex.
The only possible problem going forward is the exchange rate...
Next was the new smokebox design, to allow coal firing.
Here I am making bottom part of the somekobox, which will fit between the frames:
and here it is ready for fitting of the top/proper smokebox:
and viewed from the bottom:
it's all fabricated/brazed from sheet and than milled to size to fit tightly in between the frames.
Bottom will eventually be closed to make it into airtight box.
Smokebox proper is another fabrication from steel:
Front door and chimney to follow...
In the meantime, that's how the whole caboodle looks like:
TBC
Re: bambuko loco works 0-6-2 (Fowler)
Posted: Wed Dec 19, 2018 8:08 pm
by IanC
Superb workmanship.
Re: bambuko loco works 0-6-2 (Fowler)
Posted: Wed Dec 19, 2018 8:15 pm
by Hydrostatic Dazza
I have been pondering the fabrication of my smoke box, you have given me some leads and ideas.
I reckon I will use silver brazing (56% Harris, I use it daily in my work) for my fabrications.
Re: bambuko loco works 0-6-2 (Fowler)
Posted: Wed Dec 19, 2018 8:16 pm
by bambuko
Smokebox assembly temporarily test fitted to the frame:
and from below, showing bottom closing plate fitted as well:
and with all the frame stretchers in place:
In this view, you can see the two temporary bolts/nuts securing smokebox to the frames (eventually they will be replaced by bolts securing cylinders).
Above them two (larger) holes for steam and exhaust piping:
Also the brass angle for securing/supporting cab floor.
The two CSK slot screws between front and middle axle will be (eventually) hidden behind motion bracket.
Another view from below:
Re: bambuko loco works 0-6-2 (Fowler)
Posted: Wed Dec 19, 2018 8:33 pm
by bambuko
Hydrostatic Dazza wrote: ↑Wed Dec 19, 2018 8:15 pm
... I reckon I will use silver brazing (56% Harris, I use it daily in my work) for my fabrications.
Not an attempt to teach grandmother to suck eggs
The two reasons I am persisting with Sifbronze are:
cost - silver solder is so ***** expensive (so where I can get away without using silver solder I will not use it)
and because I can braze in two or three stages without the whole thing falling apart (I haven't used any screws to hold bits together before brazing).
Re: bambuko loco works 0-6-2 (Fowler)
Posted: Thu Dec 20, 2018 7:16 am
by FWLR
Nice bit of brazing there and some very nice machine work also.
Shame you had to throw the first attempt away. Did you salvage any of it. You put a lot of very good time and effort into it.....
Re: bambuko loco works 0-6-2 (Fowler)
Posted: Thu Dec 20, 2018 11:07 am
by bambuko
FWLR wrote: ↑Thu Dec 20, 2018 7:16 am
Nice bit of brazing there...
I would call it tolerable rather than nice
need to practice more
...Shame you had to throw the first attempt away. Did you salvage any of it. You put a lot of very good time and effort into it....
No didn't salvage anything.
Job worth doing is worth doing well, so no regrets
Re: bambuko loco works 0-6-2 (Fowler)
Posted: Fri Dec 21, 2018 6:03 am
by dewintondave
It's lovely to see so much steel being used