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General Category => Modellers At Work => Topic started by: michael mott on January 31, 2009, 10:49:44 PM



Title: Air Locomotive
Post by: michael mott on January 31, 2009, 10:49:44 PM
Marty this is what is behind the pilot

(http://i5.photobucket.com/albums/y169/my30mm/mine%20air%20loco/IMG_4617x800.jpg)

(http://i5.photobucket.com/albums/y169/my30mm/mine%20air%20loco/IMG_4608croppedx100dpix800.jpg)

It started out in life as an Aristocraft 0-4-0 switcher, There is precious little left of the original and the main body air tank was originally going to be based on an air loco at the museum in Canmore Alberta. The tank for that loco is quite a bit different than the one that is on the air loco that is on display at Bankhead on the side of Cascade Mountain in Banff National Park.

(http://i5.photobucket.com/albums/y169/my30mm/bankhead/IMG_3164sml.jpg)

The tank has been removed so that I can make a new one that better resembles the one depicted in the prototype. I am presently working up some Cad drawings of the loco that I will share when they are finished.

regards Michael


Title: Re: Air Locomotive
Post by: marc_reusser on February 01, 2009, 04:11:53 AM
Michael,

Welcome to the forum.

I see marty had the same question as me on the pilot. Beatiful work/effect on that. And a really nice job on the loco so far. I look forward to your progress.

Marc


Title: Re: Air Locomotive
Post by: michael mott on February 01, 2009, 08:42:48 AM
Good morning Marc, Thanks for the welcome and the encouragement, I really must get bact to work on this loco now that I have recently realized what was bugging me about the way it was looking. mostly it was the shape and size of the rivets on the tank. The ones on the Canmore tank are larger and more hemisperical than the ones on the bankhead tank.
(http://i5.photobucket.com/albums/y169/my30mm/mine%20air%20loco/DCP03360x800.jpg)

The original model tank was fabricated from some EMA(plastruct) grey tube with turned acrylic end caps and the rivets were scaled from the Canmore tank.

(http://i5.photobucket.com/albums/y169/my30mm/mine%20air%20loco/DCP03880.jpg)

The Bankhead tank is the same overall diameter but the rivets are smaller and flattened.

(http://i5.photobucket.com/albums/y169/my30mm/mine%20air%20loco/bankheadRailway090x800.jpg)

(http://i5.photobucket.com/albums/y169/my30mm/mine%20air%20loco/bankheadRailway064x800.jpg)

So I am going to make a new tank. The front end will be removeable to accomodate a 7.2 rechargable model car battery and reciever.

regards Michael
 


Title: Re: Air Locomotive
Post by: finescalerr on February 01, 2009, 02:14:30 PM
This looks like an interesting project. I'll be watching with anticipation. -- Russ


Title: Re: Air Locomotive
Post by: michael mott on February 02, 2009, 12:39:53 AM
The left side from the drivers end with the first attempt at the air tank, I spent some time revisiting the photographs that I have, unfortunately I did not have a tape measure with me when I took the pictures. dont ask!

(http://i5.photobucket.com/albums/y169/my30mm/mine%20air%20loco/IMG_4638x800-1.jpg)

and today I made a new tank that is 7/8ths of an inch longer, I think that the proportions look better. The rear frame has to be longer as well so that will entail a bit or reworking. I have already broken it free from the main motor block. I also recontoured the rear eliptical head and flattened it a little.

(http://i5.photobucket.com/albums/y169/my30mm/mine%20air%20loco/IMG_9008x800.jpg)

That was all I managed today, because we went for a sleigh ride in the country earlier in the day.

regards michael


Title: Re: Air Locomotive
Post by: Hauk on February 02, 2009, 05:34:10 AM
Nice work!
I can tell this is a quite large model, but what scale is it exactly?

Regards,
Håvard H


Title: Re: Air Locomotive
Post by: michael mott on February 02, 2009, 10:41:39 AM
Havard the track gauge is 45mm/1.75 inches and the original track gauge is 2 foot 3 1/2 inches which is just about 700mm gauge which is the guauge used in a number of European lines. The Bankhead Mine likely had a lot of European workers who would have brought their knowledge and traditions with them. This an assumption on my part, but it makes sense logically. actual scale ratio works out to 15.55555555 :1 so for all practical purposes it is 1:16 scale. or 3/4 inch to the foot.

I hope this answers your question.

cheers Michael


Title: Re: Air Locomotive
Post by: scrappy1 on February 02, 2009, 06:08:27 PM
and where do you get that 1.75 rail???


Title: Re: Air Locomotive
Post by: marklayton on February 02, 2009, 06:39:56 PM
Nice work - how did you fabricate the full-round rivet heads from styrene?

I've been temped to make one of these with a steel tank and actually make the mechanism work from air.  Only problem is generating enough pressure - those old pneumatic engines were pumped up to tremendous pressure by huge steam-powered compressors.  At the measly 175 psi put out by most common household compressors, couldn't store enough energy to get much run time.

Mark


Title: Re: Air Locomotive
Post by: michael mott on February 02, 2009, 11:43:14 PM
Hello Scrappy1 The rail is not 1.75 inches the guage is 1.75 inches which is the same as 45mm. The rail is code .210 which is the rail removed from some atlas 3 rail flex track The regular LGB rail is code .332

Mark I have also contemplated using real compressed air, one would have to be very carefull with the tank and valves, one could use the compressed air used for scuba diving those tanks are quite high pressure I understand. In a model I would think that the cylinders would also need to follow the same principle and use the air in a similar manner to that of the originals. The one at Canmore uses a high and low pressure cylinder, the exhaust from the high goes to power the low one on the opposite side.

The rivets were turned on my lathe and glued on, I used some 1/4 inch rigid PVC and 3/16th clear acrylic rod, I glued them on with superglue.

(http://i5.photobucket.com/albums/y169/my30mm/mine%20air%20loco/DCP03806x800.jpg)

First I made a form tool rounded the end, then parted it off. I will do the same again, this time i will make a new form tool to the smae shape as the rivets on the Bankhead Loco.

regards Michael 



Title: Re: Air Locomotive
Post by: lab-dad on February 03, 2009, 10:43:06 AM
Michael,
Awesome SBS!
Please keep the pictures & info coming!
Makes me not feel so insane after building the 1/16 Plymouth.
The how to info is very useful too.

Mark, what about those CO2 cylinders?


Title: Re: Air Locomotive
Post by: marc_reusser on February 03, 2009, 01:44:25 PM
Turning all those indicidual rivets! :o...you're a better man than I. 

Thanks for the SBS photos and explanation.
 
Why ACC for ataching the rivets to the acrylic?....wouldnt a plastic liquid glue (like the one from Plastruct) be easier and work better?


Marc


Title: Re: Air Locomotive
Post by: scrappy1 on February 03, 2009, 05:26:42 PM
you had my hopes up on smaller 1:20.3 rail.still very awesome model you are building


Title: Re: Air Locomotive
Post by: michael mott on February 03, 2009, 05:45:38 PM
Marc the rivets were a mixture of rigid PVC(the larger dark grey ones) and acrylic. The tube was EMA(plastruct) Eastman Kodak Butyrate if my foggy memory serves me correctly. I know that the rigid PVC basically needs a mechanical glue so the flat side was roughed up. It was easier to use a single glue than mix the up at the time. The new tank is white PVC  3 inch drainpipe so I am thinking that I will use the special glue that is sold for bonding ABS and PVC that is sold in cans at places like home depot. Does anyone have any experience with this glue for modelwork? I would just apply a dab with a toothpick. but I have to do a bit more turning yet!

Sorry to dissapoint you regarding the scale Scrappy1

regards Michael


Title: Re: Air Locomotive
Post by: marc_reusser on February 03, 2009, 09:49:46 PM
Michael,

I personaly have never used the PVC glue for model work...but I would be quite reticent. It seems to have issues with "stringing" as it starts to set, and also is highly aggressive towards the plastic...which forms/makes for, a good bond....but could also be a problem if you for instance press too hard on a rivet and it melts/deforms, or oozes a glue/pvc mix from the joint....or you could end up with a "string" stretching across the model, that eats into the finish....just my immediate knee-jerk concerns/thoughts.


Marc


Title: Re: Air Locomotive
Post by: michael mott on February 03, 2009, 11:59:26 PM
Marc thanks for the feedback, I guess it is time for a little experiment to see just what does in fact happen, I will try some different ways of dealing both with these materials and with a variety of glues on some scraps and report back in a day or so.

Regards Michael


Title: Re: Air Locomotive
Post by: michael mott on February 05, 2009, 08:28:31 PM
Well the first test was withthe Oatey glue for transition between ABS and PVC I used a toothpick to plasce a spot of glue on the PVC pipe placed the acrylic rivet after 24 hours solid as a rock

(http://i5.photobucket.com/albums/y169/my30mm/mine%20air%20loco/IMG_9010x800.jpg)

So I think i will go ahead with this method.

regards Michael


Title: Re: Air Locomotive
Post by: michael mott on February 07, 2009, 12:25:43 AM
I spent the last couple of evenings setting up and turning all the rivets needed for the two ends. Next I drew a rectangle the exact length of the tank diameter, printed and cut itout then wrapped it around the tank about 5/16 inch from the end

 (http://i5.photobucket.com/albums/y169/my30mm/mine%20air%20loco/IMG_9017x800.jpg)

a shot of the turned rivets.

(http://i5.photobucket.com/albums/y169/my30mm/mine%20air%20loco/IMG_9022x800.jpg)

A shot swoing the glue blob aplied with a long toothpick, The rivet needed to be placed very quickly befor the glue skinned over, which it did suprisingly fast.

(http://i5.photobucket.com/albums/y169/my30mm/mine%20air%20loco/IMG_9025x800.jpg)

The first row completed, now it was time to move the paper back a little and rotate it so that the lines were midway between the rivets of the first row.

 (http://i5.photobucket.com/albums/y169/my30mm/mine%20air%20loco/IMG_9027x800.jpg)

and finally the first end is completed I am quite pleased with the results.

(http://i5.photobucket.com/albums/y169/my30mm/mine%20air%20loco/IMG_9034x800.jpg)

I will tackle the other end tomorrow. Then back to the lathe to turn the rest of the rivets for the long rows on the seam plate and the rows on the front end of the tank.

regards Michael


Title: Re: Air Locomotive
Post by: finescalerr on February 07, 2009, 02:25:00 PM
Individually turned rivets! You are NUTS! (But they look wonderful.) -- Russ


Title: Re: Air Locomotive
Post by: John McGuyer on February 10, 2009, 06:42:07 PM
The finish on your rivet heads is excellent. I am curious about one thing; why you didn't run your cut off tool in to a set dimension, then step it over and cut the rivet off. That would give you a small shank on the back. The shank would accomplish two things, you could drill holes to help locate the the rivets, plus it would give you a mechanical connection as well as an adhesive one.

John


Title: Re: Air Locomotive
Post by: michael mott on February 10, 2009, 11:52:22 PM
Quote
why you didn't run your cut off tool in to a set dimension, then step it over and cut the rivet off

A nice idea John, As it is I found it tedious enough simply forming the head with one toolbit set parallel to the plex in the chuck. then parting off with the parting tool.

I was unable to make a new tool(my grinder is still in storage)so I had to set this up with tools already ground. My lathe is a manual one a Myford ML7 and because I do not have a capstan turret and making hundreds of rivets manually is daunting enough as it is.

I set up a backstop with the tailstock so that I could ensure that each rivet was the same length.

the following pictures show the step by step to make one rivet.

(http://i5.photobucket.com/albums/y169/my30mm/mine%20air%20loco/IMG_9040x800.jpg)

the first pic is the start of the sequence and the form tool is also positioned to act at the length stop.

(http://i5.photobucket.com/albums/y169/my30mm/mine%20air%20loco/IMG_9041x800.jpg)

The acrylic rod is indexed forward using a pair of tweezers, it was a bit tight to get my fingers in there.

(http://i5.photobucket.com/albums/y169/my30mm/mine%20air%20loco/IMG_9042x800.jpg)

The form tool is moved forward toward the chuck to put the slight curved taper on the rivet.
 
(http://i5.photobucket.com/albums/y169/my30mm/mine%20air%20loco/IMG_9043x800.jpg)

The form tool retracted and the parting tool moved into the work, as the form tool moved toward the back it also skimmed the top face of the rivet.

(http://i5.photobucket.com/albums/y169/my30mm/mine%20air%20loco/IMG_9045x800.jpg)

The rivet finally parts off and falls to the bed. The form tool is then brought back in line with the end of the acrylic and the whole process started over.

The last shot shows the overall set up.

(http://i5.photobucket.com/albums/y169/my30mm/mine%20air%20loco/IMG_9044x800.jpg)

But then perhaps it was just laziness. I also think that setting up to drill all the holes might have been even more daunting. Of course if I were to make this out of copper and was going to use real air then the rivets would need to be real and I would have to do the drilling. Fortunately on my other loco project that will only have to happen in a few places.

here is a couple of pics of the other loco, the first by itself and the second with an Ho Bachmann Percy modification to a Horwich loco, sitting on the cylinder.

(http://i5.photobucket.com/albums/y169/my30mm/live%20steam%20loco/IMG_2145sml.jpg)

(http://i5.photobucket.com/albums/y169/my30mm/live%20steam%20loco/IMG_1170sml.jpg)

Regards Michael










Title: Re: Air Locomotive
Post by: finescalerr on February 11, 2009, 03:14:55 AM
Gorgeous! -- Russ


Title: Re: Air Locomotive
Post by: marc_reusser on February 11, 2009, 04:24:36 AM
Wow! :o  Beautiful work.

Watching what you skilled machinist guys do here, makes me feel like a complete amateur! :-\

Marc




Title: Re: Air Locomotive
Post by: michael mott on February 11, 2009, 09:36:24 AM
Russ and Marc thanks for the compliments, Marc I certainly would not consider your work anything less skilled than any I seen on this or other sites. I think that the word "Amateur" gets a bit of a bad rap. I have seen such a lot of outstanding work done by "amateurs" and some pretty shoddy work done by "professionals" The difference being the former do it for the love of doing it, and the latter often get paid. I am constantly inspired by the wonderful work that I see other doing here and on some of the other sites, which in turn leads me to strive to improve and to try new ways of doing things.

regards Michael


Title: Re: Air Locomotive
Post by: jacq01 on February 11, 2009, 09:53:13 AM

    Michael,
    wonderful.
    You are right,  the purpose defines the solution.

    Jacq


Title: Re: Air Locomotive
Post by: lab-dad on February 12, 2009, 07:52:00 AM
Just wanted to add my Thanks for all the images and info.
I would love to be a fly on the wall watching the air powered loco being built!
-Marty


Title: Re: Air Locomotive
Post by: michael mott on February 12, 2009, 11:34:05 AM
The problem with being a fly on the wall Marty would be the long time lags in between the work sessions ;D ;D but thanks for the thought.

The large copper loco is a freelance one based on the Loiusa Hunslet loco from the Welsh Collieries and will be coal fired Steam.
regards Michael


Title: Re: Air Locomotive
Post by: RoughboyModelworks on February 15, 2009, 11:31:34 AM
Beautiful machining work on the Hunslet Michael. A Myford eh... I'm jealous  ;)

Paul


Title: Re: Air Locomotive
Post by: michael mott on February 15, 2009, 01:36:23 PM
Hi Paul you would be even more jelous if you know what I paid for it..... $451 brand new.... 37 years ago ;D I have no idea what they cost these days. I must admit it was a great investment, and has done a lot of work over the years.

regards Michael


Title: Re: Air Locomotive
Post by: RoughboyModelworks on February 15, 2009, 08:38:41 PM
Oh man... now I am pissed. Reminds me of those guys who find a complete panhead in some old farmer's barn and he sells it to them for $500.00... grrrr  ;)

That's a hell of a deal and an obvious testament to the quality of the machine. My dream lathe is a Cowells - maybe one of these days though I'm not likely to find one in a barn anywhere   :)

Paul


Title: Re: Air Locomotive
Post by: michael mott on February 16, 2009, 10:46:14 AM
Sorry about that Paul, I just visited the Cowells site A pretty little lathe really nice for small work http://www.cowells.com/gallery.htm (http://www.cowells.com/gallery.htm) a lot of great shots of this lathe. I was given a couple of boxes of watchmaking tools by a friend who's father retired a number of years back he kept the lathe Though :( . Before I purchased the myford I had started to make a small lathe similar to the Cowell I still have the headstock and the compound slide and the bed The bed was cut so that I could remake it into a small mill. however that died on the order desk when I purchased a Jet mill drill off of a friend about 30 years ago. The mill is still in storage at the moment. By the Way the  tools and furniture that I have in storage are because I recently moved to the new home that I am building by myself in the country by a lake. Living in an unfinished house is a bit trying. But hey it is far better than no home, and there are way too many folk in that boat around the globe. Am Now on a very small fixed income so it is very slow.

Regards Michael


Title: Re: Air Locomotive
Post by: RoughboyModelworks on February 17, 2009, 01:05:35 AM
Michael:

Sounds like you have your hands full with your model work and building your own house. I must admit it sounds very attractive building your own home by a lake.

I inherited my Boley jeweler's lathe from my grandfather who was a watchmaker along with his two-seater jeweler's bench which has been my main modeling bench for many years. The lathe is very small and I use it solely for free-hand turning work. He used to power it with a foot treadle! I modernized it with an electric motor and a variable speed foot switch. It's not nearly as sophisticated as the Cowell's machines but is surprisingly useful. Unfortunately I missed the pantograph engraving machine which could have been turned into a small pantograph mill, but such is life. My dad still has boxes of his small handtools which I continue to try to pry out of him! I'm thankful for what I did receive.

Paul


Title: Re: Air Locomotive
Post by: michael mott on February 20, 2009, 01:57:36 PM
Time for an update on the loco, I managed to get the rivets glued up along the joining plate. I am looking forward to getting these finished, because the lathe is tied up with the rivet set up and i dont want to change it untill the rivets are finished. So far there are 202 and about 40 or so to go.

(http://i5.photobucket.com/albums/y169/my30mm/mine%20air%20loco/IMG_9065x800.jpg)


the next task after the remaining few rivets will be to rework the opening at the front of the air tank. When I first did this I made it circular, but the opening is oval so I will turn up a thin ring with the profile of the inside shape and then deform it to the oval and fill the voids formed by the oval inside the circular opening on the endcap. I hope it will be easier to do than to explain.

regards Michael


Title: Re: Air Locomotive
Post by: Gordon Ferguson on February 21, 2009, 02:23:35 AM
I see you haven't lost your touch Michael  ;D

Lovely detailed work as usual , bet you couldn't fit it on your GN15 layout !

Presume with 202 individual rivets (+ the 40 to go) that the house is finshed  ;)

Gordon


Title: Re: Air Locomotive
Post by: michael mott on February 21, 2009, 03:42:09 PM


Thanks for the kind words Gordon,
Quote
Presume with 202 individual rivets (+ the 40 to go) that the house is finshed 

Gordon
I wish!! No the house is not yet finished and you are correct it will not fit onto my GN15 layout I am hoping to do some work outdoors with this one. I off fo a walk in the woods right now but when i get back I'll post some pics of the new front end cap. with the oval opening.

regards Michael


Title: Re: Air Locomotive
Post by: michael mott on February 22, 2009, 12:15:37 PM
As I promised here is a couple of shots of the now almost finished main body of the tank, it still needs all the valves and fittings and the front cap and bracket.

(http://i5.photobucket.com/albums/y169/my30mm/mine%20air%20loco/IMG_9076x800.jpg)

I made the oval section by turning up a slightly smaller ring and distorting it and then filling with modelling putty. If I had to do it over (which I'm not) I would have made the ring just alittle smaller in diameter to have made the oval just a little more oval. If thiswere meant to be an exact modl of the prototype I would. The base of the model is an Aristocraft 0-4-0 chassis so there is enough of a departure from the prototype in any case that the model is really only a representative one. I do think that i will need to rework the chassis a bit though looking at the overall shot.

here is a detail of the oval production.

(http://i5.photobucket.com/albums/y169/my30mm/mine%20air%20loco/IMG_9069x800.jpg)

regards Michael


Title: Re: Air Locomotive
Post by: lab-dad on February 23, 2009, 08:04:51 AM
Thanks for sharing all this, I am learning a lot!

BTW
What a life; building models and walking in the woods. You are a lucky man!

-Marty


Title: Re: Air Locomotive
Post by: Waldbahner on February 23, 2009, 08:26:18 AM
Hello Michael,

a wounderfull and great detailed model is growing here on your werkbench. I really like the self made rivets.
I'll have a similar problem one day, when the boiler for my Shay will be detailed. As the vertical part on T-boilers was seldom covert, all rivet work will be clearly visible and have to be modeled.

So long, I enjoy your work and I'm very interested in the final look of your air loco.

BTW : Your rotten wooden endbeams are realy awesome.

Gerd


Title: Re: Air Locomotive
Post by: michael mott on February 23, 2009, 12:13:34 PM
Marty, Gerd thanks for your compliments. "I bit the bullet" as they say and discarded the original Aristo chassis, so now all that is left of the original loco is the wheels,  Motor and con rods plus the foundation for the cylinders.

here is the start of the chassis,

  (http://i5.photobucket.com/albums/y169/my30mm/mine%20air%20loco/IMG_9078x800.jpg)

I don't have my mill or drill press set up yet so I had to make the middle plates just with a jewellers saw and files, a bit more fiddly but still rewarding. I tried a new glue "Plastruct Weldene" as my Ambroid "Pro Weld" is just about used up. I found that the weldene is a much slower setting glue and I do prefer the pro weld which seems to set up faster.  At this point I cannot speak to the strength of the weldene as I have not had time to really test it yet. So only one of the middle plate is glued with the new glue.

(http://i5.photobucket.com/albums/y169/my30mm/mine%20air%20loco/IMG_9082x800.jpg)

I like the new frame better because the plastic of the Aristo did not want to glue to styrene very well and now I have an integral beam running all the way through. I will also be a bit more open, The motor shows but I will paint it black to help it fade away. I can now add some spring detail which will help with the overall look.

(http://i5.photobucket.com/albums/y169/my30mm/mine%20air%20loco/IMG_9083x800.jpg)

I am glad that I made the "rotten" end beams bolt on and removeable, They will be able to bolt back onto the new frames as soon as I get the appropriate brackets made.

regards Michael


Title: Re: Air Locomotive
Post by: marc_reusser on February 23, 2009, 11:55:39 PM
Beautiful work. Great to watch and, so  much to learn. Thanks!


Marc


Title: Re: Air Locomotive
Post by: Marty J on February 24, 2009, 08:51:02 PM
Hi Micheal,
I have not seen you air loco for awhile - it's really looking wonderful.
The new rivits set it off.
Cheers,
Marty J  (yet another Marty  :) )
www.narrowgaugechaos.com


Title: Re: Air Locomotive
Post by: michael mott on February 24, 2009, 10:15:09 PM
Hi Marty J thanks for the compliment, good to see you here, there is some fantastic work on this site.

regards Michael


Title: Re: Air Locomotive
Post by: michael mott on February 25, 2009, 06:35:59 PM
I fitted the original baseplate(much modified) to the new chassis this gives it some good rigidity, and also refitted the rear buffer beam, I needed to turn up some smaller more rounded rivets for the fixing, the angle bracket is glued but the rivets will gice the impression that it is riveted

(http://i5.photobucket.com/albums/y169/my30mm/mine%20air%20loco/IMG_9086x800.jpg)

regards Michael


Title: Re: Air Locomotive
Post by: RoughboyModelworks on February 26, 2009, 11:02:02 PM
Beautiful job Michael. I like your solution to the oval opening... excellent application of lateral thinking  ;)

Paul


Title: Re: Air Locomotive
Post by: michael mott on February 27, 2009, 01:10:35 AM
Thanks for that Paul, I have been a fan of Edward De Bono for years. Must be rubbing off a little ;D

today I was going to remount the front buffer beam but got sidetracked reworking the slidevalve chest, it was not positioned correctly and the slide rod was directly over the cross slide, I also to the opportunity to add the exra details that are on the prototype.

(http://i5.photobucket.com/albums/y169/my30mm/mine%20air%20loco/IMG_9092x800.jpg)

The wheels and motor are meshing ok I gave the motor a whirl and it ran smoothly, now all I have to do is finish the rodding.

regards Michael



Title: Re: Air Locomotive
Post by: Waldbahner on February 27, 2009, 01:16:58 AM
Hello Michael,

I can't see your latest pictures.. is that a problem with my PC or something other?

Thanks, Gerd


Title: Re: Air Locomotive
Post by: marc_reusser on February 27, 2009, 03:04:14 AM
Well if it's you...then I have the same dysfunctional problem ;)

Marc


Title: Re: Air Locomotive
Post by: Waldbahner on February 27, 2009, 03:32:42 AM
Hello Marc,

I just checked the path of the last two pictures and they goes to the 7/8th page instead to photobucket as in the pics before. Maybe we've to be looked in to the 7/8th page to see the pictures... As I've an account there too, I'll check it out.

Bye.


Title: Re: Air Locomotive
Post by: michael mott on February 27, 2009, 09:25:02 AM
Hello  sorry about the mix up, I have posted the pics again through the photobucket site, too many different paths :-[
I hope you can see them now.
regards Michael


Title: Re: Air Locomotive
Post by: michael mott on March 02, 2009, 11:43:16 AM
Another update; I spent a few hours this weekend rebuilding one of the cylinders to better reflect the prototype. This work took much longer than I had andticipted. The thing that was bothering me about the existing cylinders was the ribbing of the main body. The new cylinder is formed from a series of disks the larger diameter one is .035" thick and the smaller disk is .060" thick". I wanted to see if I could pull this off without using a lathe, or laser cut parts. Basic fabrication techniques were used and all the drilling of the disks was done by hand with a drill in a pinvise. The thin disks were spun in  hand drill with a course sanding stick, then a fine one to get the taper on the edge. All other shaping was done with flush cut sidecutters and files and a jewellers saw.

(http://i5.photobucket.com/albums/y169/my30mm/mine%20air%20loco/IMG_9102x800.jpg)

shot shows the progression of making the disks

(http://i5.photobucket.com/albums/y169/my30mm/mine%20air%20loco/IMG_9104x800.jpg)

The web extension on the thin disk

(http://i5.photobucket.com/albums/y169/my30mm/mine%20air%20loco/IMG_9118x800.jpg)

the body extension on the thick disk

(http://i5.photobucket.com/albums/y169/my30mm/mine%20air%20loco/IMG_9126x800.jpg)

right and left showing the difference on the ribs or cooling fins

(http://i5.photobucket.com/albums/y169/my30mm/mine%20air%20loco/IMG_9131x800.jpg)

and from the other end.

I reused the front plate from the orignal rebuild The difference between the cylinders is not great but I am happy with the results, now that i have worked out the method I will do the opposite one.

regards Michael

 


Title: Re: Air Locomotive
Post by: Gordon Ferguson on March 03, 2009, 02:10:32 AM
I admire your patience, as well as your quest for accuracy - looks really good and you can see that all that work was worth it when you compare the before and after shot.

Question - the nuts and bolts ?  plastic rod for the bolts, are the nuts cut from hexagonal rod? can you buy this or is this something else you did in a few spare moments?

Gordon


Title: Re: Air Locomotive
Post by: michael mott on March 03, 2009, 01:42:08 PM
hello Gordon the hex rod is Plastruct pt#90877 3.2mm .125" 5 pieces per pack. I cheated and bored the 1/16th hole in the lathe then parted off the nuts.  I think that the next loco I build will be entirely from scratch, because i have gone back and made so many changes it would have been faster if I had started that way in the begining. One thing I will do this summer is to take a notepad and tape measure also a measure stick and do a much better job of measuring up the loco. All I will have to do is make sure that I am not alone as the original loco is at a high elevation in the mountains and it is bear country. After working on the model I have so many questions now and so aother expedition to the real loco will answer them. It is always great to spend a couple of days in the mountains.  I would like to build a model out of brass, I will finish this one first.


Title: Re: Air Locomotive
Post by: lab-dad on March 04, 2009, 07:51:39 AM
"Couple of days in the mountains"

I'll go! pick me, pick me!!!!
Great SBS too!

-Marty


Title: Re: Air Locomotive
Post by: RoughboyModelworks on March 07, 2009, 03:28:39 PM
Michael:

Really like the new cylinders. The cooling fins are much more convincing, but what a chore cutting all those disks by hand instead of using the lathe.  ;)

Paul


Title: Re: Air Locomotive
Post by: Ray Dunakin on March 14, 2009, 09:15:50 PM
Wow, that looks great! Really nice work!



Title: Re: Air Locomotive
Post by: michael mott on March 22, 2009, 10:28:10 PM
Thanks for the compliments, I have not had much time to work on the loco this past couple of weeks, I hope to be able to get back to it soon.


Title: Re: Air Locomotive
Post by: michael mott on August 25, 2012, 03:04:12 PM
The parts for this model are all sitting patiently in a large tin box on the shelf, One of these days I will get back to it I promise.

Michael