bambuko loco works 0-6-2 (Fowler)

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Re: bambuko loco works 0-6-2 (Fowler)

Post by bambuko » Sun Apr 01, 2018 1:41 pm

Thank you @ FWLR :)
Managed to get some work done... front hornblocks temporarily secured to frames for drilling (and later tapping 10 BA)
At this stage axlebox opening in the hornblocks are undersize (metal on), with final machining to size to be done after the frames are brazed and hornblocks are bolted and Loctited to the frames (we shall see how this theory works in practice... :silent: )

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Re: bambuko loco works 0-6-2 (Fowler)

Post by bambuko » Mon Apr 02, 2018 7:29 pm

Today, spent a lot of time tapping the holes in hornblocks:

Image

An exercise in patience :lol: , with occasional clenched buttocks :mrgreen:
32 holes tapped, 16 more to do on rear hornblocks, plus 12 for keeps...
I reckon I will be sick of small thread tapping for a while :oops:

Here the results:

Image

BTW next to the tap holder is homemade 12 BA socket (better :thumbleft: than commercially available ones afaiac)

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Re: bambuko loco works 0-6-2 (Fowler)

Post by tom_tom_go » Mon Apr 02, 2018 7:53 pm

Excellent work, I can only marvel at your skills.

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Re: bambuko loco works 0-6-2 (Fowler)

Post by FWLR » Tue Apr 03, 2018 7:07 am

I agree, that’s some very nice skill being shown.
Rod

Life is so easy when I run my trains. :thumbright:

🚂🚃🚃🚃🚃🚃🚃🚃🚃🚃

https://gardenrails.org/forum/viewtopic ... 41&t=11364

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Re: bambuko loco works 0-6-2 (Fowler)

Post by bambuko » Tue Apr 03, 2018 2:37 pm

You are far too generous guys :thumbright:
Glad you enjoy it! - thank you for your kind comments.

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Re: bambuko loco works 0-6-2 (Fowler)

Post by dewintondave » Wed Apr 04, 2018 10:51 am

Lovely work!
Best wishes,
Dave

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Re: bambuko loco works 0-6-2 (Fowler)

Post by Hydrostatic Dazza » Thu Apr 05, 2018 3:36 am

Snipped for clarity
bambuko wrote:
Mon Apr 02, 2018 7:29 pm
BTW next to the tap holder is homemade 12 BA socket (better :thumbleft: than commercially available ones afaiac)
Could you elucidate on how you made the 12 BA socket ?

The Eclipse type pin chuck is a good idea and I am inspired to make some sockets like yours.
Cheers from Dazza, The Hydrostatic Lubricator 8)
The chances of finding out what’s really going on in the universe are so remote, the only thing to do is hang the sense of it and keep yourself occupied. Douglas Adams

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Re: bambuko loco works 0-6-2 (Fowler)

Post by bambuko » Thu Apr 05, 2018 9:04 am

This particular 12BA socket started life as stainless M5 Allen key grub screw (which uses 2.5mm Allen key).
OD of the socket head is 3.6mm, which means it can get into some very tight spaces.
Proper 12BA A/F should be 2.3mm (Nuts and Bolts across flats is nominally 1.75 x Major Diameter) but those 10BA "one size smaller head" bolts are made from 2.5mm hexagon.
If you needed socket for 2.3mm AF bolt head, you would need to find imperial screw that uses 3/32" Allen key.

10BA socket is M4 Allen key bolt (which uses 3.0 Allen key).

Not my idea btw, read about it very long time ago... :)

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Re: bambuko loco works 0-6-2 (Fowler)

Post by Hydrostatic Dazza » Thu Apr 05, 2018 9:41 pm

bambuko wrote:
Thu Apr 05, 2018 9:04 am
This particular 12BA socket started life as stainless M5 Allen key grub screw (which uses 2.5mm Allen key).
OD of the socket head is 3.6mm, which means it can get into some very tight spaces.
Proper 12BA A/F should be 2.3mm (Nuts and Bolts across flats is nominally 1.75 x Major Diameter) but those 10BA "one size smaller head" bolts are made from 2.5mm hexagon.
If you needed socket for 2.3mm AF bolt head, you would need to find imperial screw that uses 3/32" Allen key.

10BA socket is M4 Allen key bolt (which uses 3.0 Allen key).

Not my idea btw, read about it very long time ago... :)
YAY, thanks for that. I am going to create my set of sockets.
Cheers from Dazza, The Hydrostatic Lubricator 8)
The chances of finding out what’s really going on in the universe are so remote, the only thing to do is hang the sense of it and keep yourself occupied. Douglas Adams

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Re: bambuko loco works 0-6-2 (Fowler)

Post by bambuko » Sun Aug 19, 2018 11:22 am

Summer is usually dedicated to my other (non-steam) hobbies, so there was long silence... but recent "bad" weather meant that I had some time in the workshop.

Here is the result - frame brazed together (I have used Sifbronze No1 and oxy-propane):

Image

and viewed from below:

Image

Result is strong and solid frame, but it wasn't easy...
It was constant battle to keep it straight, even despite my brazing fixture.
Partly because I have used BMS (cold rolled steel), which at the slightest provocation (any machining or heating) springs into live releasing internal stresses caused by cold rolling, but also because my heat control when brazing is crap (need a lot more practice...).

It will do for the first frame :thumbup:
Next one will (hopefully) be better and easier :)

ps
anybody knows of a source of hot rolled steel sheet in the sizes we need for our gauge?
I can get it from 3mm (1/8") upwards but nothing thinner - I guess it's just not commercially available?

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Re: bambuko loco works 0-6-2 (Fowler)

Post by Busted Bricks » Sun Aug 19, 2018 12:49 pm

One of the suppliers here in Denmark that we use has hot rolled sheet down to 1.5mm.

Here is a UK supplier:

http://www.willsdensteel.co.uk/steel-sh ... eel-sheet/

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Re: bambuko loco works 0-6-2 (Fowler)

Post by bambuko » Sun Aug 19, 2018 2:18 pm

Thank you for that BB.
Good to know that "our" sizes are available (just need to find now someone who will sell me the small quantity I need, not the lorry load :D )

and... one more photo - brazing fixture, now being used as a machining fixture to finish mill hornbloacks:

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Re: bambuko loco works 0-6-2 (Fowler)

Post by GTB » Sun Aug 19, 2018 3:14 pm

bambuko wrote:
Sun Aug 19, 2018 11:22 am
anybody knows of a source of hot rolled steel sheet in the sizes we need for our gauge?
I can get it from 3mm (1/8") upwards but nothing thinner - I guess it's just not commercially available?
Depends on where you live I guess. I assume you've tried the UK model engineering trade.

Are there any metal fabricators in your area? A local trailer builder was happy to sell me off-cuts, but unfortunately doesn't use anything thin enough for loco frame use in my scale.

I use HR sheet in 1.6mm for plate frames and 3mm for bar frames, as HR is all I can get in small 12" x 15" sheets here in Aust.

I know that 1.6mm CR sheet is rolled in Aust., but no-one sells it in small sheets and I don't have the facilities to handle a full size 2.4m x 1.2m sheet.

I'd actually prefer to use CR sheet for making frames, as descaling HR sheet is a pain in the nether regions, but then I don't braze my frames........

Regards,
Graeme

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Re: bambuko loco works 0-6-2 (Fowler)

Post by Busted Bricks » Sun Aug 19, 2018 3:36 pm

You could try businesses that do laser cutting. They may have some thin HRS in stock.

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Re: bambuko loco works 0-6-2 (Fowler)

Post by bambuko » Sun Aug 19, 2018 3:55 pm

Thank you guys.
Yes, opinions are divided between CRS and HRS for the frames (specially in bigger gauges where it is more of an issue).
I am guessing, that using common 16mm practice of unsprung axles makes the frames less prone to any distortion?
and...as you say cold rolled is easier to work with.
I am guessing GBT that you are talking about black stuff, which is indeed a bitch to de-scale.

Since asking the question I have found hot rolled steel down to 2mm thick (from the usual auction site :D ) so I will try it on the next frame, to see if it makes difference?

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