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Post by 92220 on Dec 21, 2019 13:37:12 GMT
Hi Roger.
Yes. I picked up on the BBCode when I went back into Flickr. I had originally just picked the link to the photo, by mistake. My camera is set to maximum resolution, which is 52M. That way I can blow sections of pics up to see very fine detail. Setting to minimum resolution still produces a 12.8M file when loaded into Paintshop Pro for cleaning up and file reduction. I normally resize to 4M for Ebay, photo hosting sites. I will definitely try Dan's idea of 800 x 600.
Bob.
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Post by 92220 on May 6, 2020 8:33:31 GMT
Hi folks. Before I start I should tell you I have been having problems again, with Photobucket! I then tried to use my Flickr account and had all sorts of trouble with that. I also realised they had changed how uploads are done and I couldn’t work it out, so I decided to try my Imgur account. I set these up ages ago, when Photobucket stopped hosting for free. Anyway, Imgur has been the easiest to get back in to and so HOPEFULLY, the photos will come out on here. I haven’t added anything to the build diary for some time because what I am doing is a very slow job, and I have been adding to the scrap bin quite extensively!!! Since last posting, I have been making the backhead and a scale firedoor sliding frame. I have the backhead plate fitted to the rear firebox clothing molded corners. I will then have to work out how to join up with the firebox clothing wrapper, but before I do that I have to complete the firebox sliding frame and fit it to the backhead. This is how the sliding frame was made: Machining the slideways: The frame jigged for silversoldering: Machining the door-sliding linkage: Machining the tray above the firehole: The finished tray: The tray jigged to the frame for silversoldering: Making up the glare shield: The glare shield bolted to the tray: The sliding frame with glare shield, mounted on the backhead plate: Mike Jack is going to cast scale doors with the raised text on them but I have made up some dummy doors to get it all assembled correctly. The made-up doors are nearly right but the cast ones will really finish it off. Machining the dummy doors out of 0.25” mild steel flat: The fire hole liner and front screen: This is it fitted to the door sliding frame: Here it all is fitted to the backhead: The next job was the ‘Flap plate’ that hinges up and down to also act as a glare screen. This was made of 0.6mm thick mild steel sheet. The shape is such that it is impossible to machine conventionally. Luckily, with CAD it is easy. The tool path was drawn in and then divided into 20 sections. Each of these sections were then dimensioned. A piece of 0.6mm steel was clamped to a piece of sacrificial aluminium and the milling cutter zeroed. The machining was done with a 2mm carbide slot drill, and used like a normal twist drill….I just positioned the cutter at each dimensioned position and carefully pulled the quill handle down as if I was drilling a hole. This left a scalloped edge but it was very easy to clean it up with a swiss file.This is the drawing used for the slot drill positions: This is the finish machined flap plate. The tail is over long because I’m not exactly sure how it will all fit in because everything is so close. As it turned out, the flap plate ended up very close to the BR drawing: This is setting it up to silversolder the hinge in place: This is the ‘press tool’ made up to produce the embossed cross, in the centre, that acts as a stiffening in fullsize: The flap plate has a chain fitted that eventually gets clipped to the back of the pedestal, but that will have to wait. Finding chain of the right size, was quite difficult. I did eventually find one on Ebay with 2mm x 1mm links – perfect size!! This is the finished slide frame with dummy doors fitted: You can see how close fitting the flap plate is, in the firehole. That is why I was concerned and left the tail longer than scale, before bending and finally cutting to size. Bob
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Post by 92220 on May 6, 2020 8:38:43 GMT
Help!! The photos have come out too big on here. Can anyone tell me how to reduce the photo size in Imgur? Flickr has a facility to limit the final photo size.
Bob.
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uuu
Elder Statesman
your message here...
Posts: 2,815
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Post by uuu on May 6, 2020 8:47:14 GMT
They're displaying very nicely for me. Perhaps my browser (MS Edge) is auto-adjusting the width to fit.
Wilf
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stevep
Elder Statesman
Posts: 1,070
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Post by stevep on May 6, 2020 8:54:31 GMT
They're displaying well for me too, and I also use Edge (the new version).
P.S. The upload button on Flickr is in the top right hand corner - an upward arrow.
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Post by 92220 on May 6, 2020 10:22:24 GMT
Thanks Steve. Just found it.
Bob.
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Post by Deleted on May 6, 2020 13:41:47 GMT
Hi Bob.. for Imgur? add a 'l' before the '.' this will reduce that size, 'l' for large, 'm' for medium and 's' for small... I find large is best which will be smaller than the raw image you have above... Pete
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Post by 92220 on May 6, 2020 15:43:28 GMT
Thanks Pete. I will try that next time.
Bob.
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Post by Roger on May 6, 2020 19:38:46 GMT
Stunning work Bob, just lovely.
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Post by jon38r80 on May 6, 2020 20:39:13 GMT
Looks as good as Rogers!
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JonL
Elder Statesman
WWSME (Wiltshire)
Posts: 2,911
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Post by JonL on May 6, 2020 20:45:20 GMT
That is just beautiful. Like microsurgery. Good work.
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Post by 92220 on May 7, 2020 8:05:56 GMT
Thanks guys. I forgot to say about the sections of the backhead plate. The individual plates are actually all one plate. It is made of 0.6mm nickel silver and the individual plates are done by cutting with a Stanley knife and a straight edge. The idea of using the Stanley knife instead of, say, a scriber, is that it doesn't remove any metal as in a scribed line. The Stanley blade microscopically shapes the 'cut' and makes it look like the edge of a guillotined plate...slightly rounded. I am sure this would also work with brass sheet, but I don't think with steel. The hex head screws are M0.8mm screws from Knupfer.
Another handy trick I found....I wanted slots in the door lever handles that are 1.8mm wide. Try getting a 1.8mm end mill or slot dril. No chance!! I machined a 1.5mm wide slot first, then using the end readings on the DRO to ensure a brand new 1.8mm carbide PCB drill, was in exactly the right places, I gently used that as a slot drill, right at the top of the flutes for minimum overhang, to open out the slot to 1.8mm wide. Worked a treat!
Bob.
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timb
Statesman
Posts: 512
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Post by timb on May 9, 2020 7:49:59 GMT
Hi Bob, did you shot blast the frame and tray to remove the machining marks, if so it seems a delicate part for such a process, how was this done and what medium did you use?
Excellent work, very neat!!
Tim
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Post by 92220 on May 9, 2020 8:28:32 GMT
Hi Tim.
Yes I blast most steel parts that I make. I use glass beads, 1mm and smaller, at an air pressure of around 90 psi. I use glass beads because they don't damage the surface like aluminium oxide does. It takes a bit longer to clean a surface but it is a much better finish. It is surprising how small a part you can blast. Although the air is at 90 psi, it doesn't seem to have a great wind effect on the item being blasted.
Bob.
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Gary L
Elder Statesman
Posts: 1,208
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Post by Gary L on May 11, 2020 19:05:46 GMT
Thanks guys. I forgot to say about the sections of the backhead plate. The individual plates are actually all one plate. It is made of 0.6mm nickel silver and the individual plates are done by cutting with a Stanley knife and a straight edge. The idea of using the Stanley knife instead of, say, a scriber, is that it doesn't remove any metal as in a scribed line. The Stanley blade microscopically shapes the 'cut' and makes it look like the edge of a guillotined plate...slightly rounded. I am sure this would also work with brass sheet, but I don't think with steel. The hex head screws are M0.8mm screws from Knupfer. Another handy trick I found....I wanted slots in the door lever handles that are 1.8mm wide. Try getting a 1.8mm end mill or slot dril. No chance!! I machined a 1.5mm wide slot first, then using the end readings on the DRO to ensure a brand new 1.8mm carbide PCB drill, was in exactly the right places, I gently used that as a slot drill, right at the top of the flutes for minimum overhang, to open out the slot to 1.8mm wide. Worked a treat! Bob. You can instantly see that firehole assembly came from Swindon. I’ve never noticed it on other BR Standards, not that I’ve seen very many. As a matter of curiosity, were all the 9Fs the same, or was it just added to Evening Star as part of its ‘westernisation’, like the copper chimney cap? In fact was it applied to any other Standard classes at all? Pardon my ignorance... Gary
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mbrown
Elder Statesman
Posts: 1,720
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Post by mbrown on May 11, 2020 20:43:52 GMT
According to E S Cox, the firedoors specified for the BR standards were LMS-type or GWR type. The LMS style had greater air gaps and were presumably more suited to hard coals which needed substantial amounts of top air coming through the hollow doors. The GWR type had smaller air slots and were designed for the softer Welsh coal. My guess is that, as the Standards migrated around the system, doors might have been changed when locos were allocated to different sheds, but that there would have been a fair bit of diversity with different types of door seen on locos stabled, and coaled, at the same place.
The 9F story is a bit more subtle. The big oval firehole led to complaints from crews that they were subject to too much radiant heat and glare - hence the protective screen which Bob has modelled and which can be seen on Evening Star to this day. But some if not all 9Fs on the Eastern Region were fitted with LNER style swing doors with the classic tip-up flap in the centre. It must have taken a considerable knack to swing a loaded shovel through the small aperture into the back corners, but they managed it on Gresley locos and I am sure the LNER firedoor kept the heat in better than the sliding types.
I have seen a picture once of a 9F with an LNER firedoor but can't recall where. The saga of the fireholes is fully set out in the RCTS book on the BR Standards Vol.4.
So an LBSC style swing door on a model 9F is not a complete no-no!
Malcolm
I
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don9f
Statesman
Les Warnett 9F, Martin Evans “Jinty”, a part built “Austin 7” and now a part built Springbok B1.
Posts: 960
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Post by don9f on May 11, 2020 20:45:12 GMT
9Fs came with different firehole door arrangements, to suit the requirements of the particular Region they were initially allocated to. According to a book of mine, there were different styles of the actual doors to suit the type of coal, the handle could open to the left or right and I think the NE Region’s allocation had oval hinged doors! Obviously this all went out the window as reallocations occurred, which became commonplace towards the end of steam!
When I was researching for my chosen example 92167, I looked at countless photos and can confirm the above, plus numerous other differences. They probably all had a “standard” mounting arrangement on the back head though, as the boilers (apart from the Crostis , but including ten “standard” spare ones for the 241 “normal” 9Fs) were all supposedly interchangeable.
Cheers Don
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don9f
Statesman
Les Warnett 9F, Martin Evans “Jinty”, a part built “Austin 7” and now a part built Springbok B1.
Posts: 960
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Post by don9f on May 11, 2020 20:58:36 GMT
The 9F story is a bit more subtle. The big oval firehole led to complaints from crews that they were subject to too much radiant heat and glare - hence the protective screen which Bob has modelled and which can be seen on Evening Star to this day. Malcolm Having fired 92214 many times in preservation, I can vouch for this and have burnt, or melted parts of my overalls in the process! And that’s just “playing at it” on a few coaches, never mind tackling something like the Settle & Carlisle....ie “The Long Drag”! Cheers Don
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mbrown
Elder Statesman
Posts: 1,720
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Post by mbrown on May 11, 2020 21:30:07 GMT
We narrow gauge types just don't know we're born!
Malcolm
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Gary L
Elder Statesman
Posts: 1,208
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Post by Gary L on May 12, 2020 0:38:24 GMT
The 9F story is a bit more subtle. The big oval firehole led to complaints from crews that they were subject to too much radiant heat and glare - hence the protective screen which Bob has modelled and which can be seen on Evening Star to this day. Malcolm Having fired 92214 many times in preservation, I can vouch for this and have burnt, or melted parts of my overalls in the process! And that’s just “playing at it” on a few coaches, never mind tackling something like the Settle & Carlisle....ie “The Long Drag”! Cheers Don Very interesting Malcolm and Don, I had no idea. Another proof of the old saw: " The nice thing about standards is there are so many to choose from!" Gary
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