Author Topic: 2" minnie build so far.  (Read 13324 times)

Offline sjb

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2" minnie build so far.
« on: August 09, 2010, 08:59:08 AM »

Here are some pictures of my doubled up minnie so far.

I rolled the front wheels after build a bending roll and brazed in the center ring which was trepaned out of 1/8 plate. The rear wheel is 12" in diameter and was machined from a peice of ALi pipe.







Steve

Offline raynerd

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Re: 2" minnie build so far.
« Reply #1 on: August 09, 2010, 10:11:10 AM »
Nice work mate! I`ve got all the plans and book for the original Minnie and may one day consider building a 2" Minnie .. one day! Keep us updated and it looks good so far. Thanks for the pics and I would welcome any "machining" shots if you get time as you continue with this!

Good work... :bow:
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Offline jim

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Re: 2" minnie build so far.
« Reply #2 on: August 09, 2010, 11:02:11 AM »
nice work :thumbup:

what sort of time frame is this build?
if i'd thought it through, i'd have never tried it

Offline sbwhart

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Re: 2" minnie build so far.
« Reply #3 on: August 09, 2010, 11:07:26 AM »
Nice build Steve

I've built quite a few bits for 1" Minnies:- boiler feed pumps, bypass valves, lubricators and Cylinders, there a very well designed engine though I think the 1" scale is a little small but 2" is a different kettle of fish.

Look forward to watching progress

Stew
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Offline Jasonb

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Re: 2" minnie build so far.
« Reply #4 on: August 09, 2010, 12:05:36 PM »
Looks like you are off to a good start, having built a 1" I'm sure the 2" will be a lot less fiddly to make much like the 2" Fowler I'm doing at the moment.

Don't know if you frequent Traction Talk Forum but there are a couple of others there currently building the 2" Minnie and a comple that have completed ones in1" 2", 2 1/2" and 3" so if you have any questions its a good place to ask.

Jason

Offline sjb

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Re: 2" minnie build so far.
« Reply #5 on: August 09, 2010, 03:07:46 PM »
Many thanks guys for the thumbs up.

It's good to get some feedback positive or negative, especially as I'm not a member of any model engineering society at present. I am running this project together with my princess marina in 3 1/2 inch gauge (see introduction for picture) . I'm not sure as to how long it will take just slowly gathering materials as money and time allows. Yes happy to add some machining pictures if you like.

Kind regards

steve

Offline Jasonb

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Re: 2" minnie build so far.
« Reply #6 on: August 09, 2010, 03:35:37 PM »
My Minnie took 13yrs but the Fowler should be done in about 4yrs if I stop playing about with teh hit & miss engine I've just started doing a bit on.

Few pics of teh Minnie here to give you some inspiration and a pic of one of teh nicest 2" Minnie sabout here

Jason

Offline sjb

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Re: 2" minnie build so far.
« Reply #7 on: August 09, 2010, 03:46:49 PM »

Youv'e built a very nice engine there, hope mine ends up looking half that good.  Did you find any errors in the drawings?

I have been looking at stationroadsteam's archive and youtube for inspiration.

Steve

Offline Jasonb

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Re: 2" minnie build so far.
« Reply #8 on: August 10, 2010, 02:32:56 AM »
I built mine from the drawings in the book and can't recall any errors.

Jason

Offline Brass_Machine

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Re: 2" minnie build so far.
« Reply #9 on: August 11, 2010, 03:15:21 PM »
Steve,

Nice start. That is a nice looking model to build. Maybe in a few years I will have the patience to start something like that. Keep us informed of how it goes.

Eric
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Offline sjb

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Re: 2" minnie build so far.
« Reply #10 on: July 18, 2011, 06:39:19 AM »
All,

Iv'e managed to get some time to work ojn my my minnie.

Steve

Offline CallMeAl

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Re: 2" minnie build so far.
« Reply #11 on: July 18, 2011, 11:39:31 PM »
Great looking parts. :thumbup:

Al
I skin cats my own way!

Offline sjb

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Re: 2" minnie build so far.
« Reply #12 on: October 05, 2011, 10:40:16 AM »

 :update:
I've made some more progress on my minnie, desperately to get as much completed before the end of the year if I can dodge the decorating. Hope these are of interest. :bugeye:

Steve

Offline saw

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Re: 2" minnie build so far.
« Reply #13 on: October 05, 2011, 11:01:01 AM »
Wow, fantastic...  :bugeye:
Nice build  :clap: :clap:
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Offline andyf

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Re: 2" minnie build so far.
« Reply #14 on: October 05, 2011, 02:41:51 PM »
Great! Seems to have come on a lot since you showed the front axle beam + wheels and a rear wheel rim.

Ihe last pic, the back wheel shows that the anti-gravity pack is working a treat  :lol:

Andy.

Sale, Cheshire
I've cut the end off it twice, but it's still too short

Offline sjb

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Re: 2" minnie build so far.
« Reply #15 on: October 05, 2011, 03:12:40 PM »
Andy, that anti gavity pack cost me a fortune! The only problem is slamming the garage door stops working! :scratch:

Steve

Offline Stilldrillin

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Re: 2" minnie build so far.
« Reply #16 on: October 05, 2011, 03:39:55 PM »
That is shaping up soo nicely Steve!  :clap: :clap: :thumbup:

David D
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Offline doubleboost

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Re: 2" minnie build so far.
« Reply #17 on: October 05, 2011, 04:16:01 PM »
Some fine work there
Much better in a bigger scale :thumbup: :thumbup:
Keep the pictures coming
John

Offline madjackghengis

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Re: 2" minnie build so far.
« Reply #18 on: October 06, 2011, 10:27:32 AM »
Hi Steve, I was admiring the very fine machining of the cast iron shown in your lathe, and then on to the following pictures, am I right in believing you've taken that cast iron "sheeve", turned it into a wheel hub, and the arm(s) are to be spokes?  I must say, your lathe turns a very fine finish on the iron, and it looks great.  I see lots of small parts and rivets in your future :lol:  that should be a fine looking beastie when she's done.  Very nice work and nice layout altogether.  Looking forward to learning something about traction engines. :beer:  Cheers, mad jack

Offline sjb

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Re: 2" minnie build so far.
« Reply #19 on: October 07, 2011, 04:31:32 AM »
Hi Jack,

Thanks for the kind comments. The first two pictures show the winding drum which fits to the rear axle and was machined from a piece of cast iron round. The driving centre has still to be made and I think the quality of the material had more to do with the finish than my machining ability!

The next few pictures show the spoke pockets being machined in the wheel hub. The spokes I purchased as laser cut items from Malcolm at Model Engineers Laser (nice guy to deal with, no relation etc). The picture of the wheel in the building jig keeps everything in the right place while bending and fitting the spokes. It also shows the hub with it's cover in place. When I have fitted the first 8 spokes I will flip the wheel over and fit the rest.

I can happily take more pictures of this process if your interested.

Steve

Offline AndyB

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Re: 2" minnie build so far.
« Reply #20 on: October 07, 2011, 04:03:15 PM »
Hi Steve,

Excellent work!!! :bow: :drool:

I would like to pick your brains...

What thickness of copper did you use for the boiler?

A 2" Minnie is my next big project (after the RE!!!) and I have been looking at doubling all specs in the book...except I don't think the boiler has to be twice as thick...or does it?

The wheels are fantastic. I will have to go for rolled having only 3 1/2" lathes and no mill. Any tips gratefully received. Did you make your own rollers?

Andy
Waveney Valley, Suffolk/Norfolk Border

Offline Jasonb

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Re: 2" minnie build so far.
« Reply #21 on: October 08, 2011, 02:49:32 AM »
Steve, its comming along well, got the fun bit of riviting in the spokes next :)

Andy, 5swg or nearest metric 3.0mm would be right for the 2" Minnie, the tube number and sizes want playing with though as its better to have a larger number of tubes that are not double the 1" scale diameter. There are several other items that can be slimmed down a bit as well to avoid a chunky looking engine and the water pump is best moved away from the boiler side.


J

Offline AndyB

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Re: 2" minnie build so far.
« Reply #22 on: October 08, 2011, 09:15:30 AM »
Brill!

Many thanks Jason...I should have known to ask your advice first :bow: :bow: :bow: :bow:
« Last Edit: October 08, 2011, 10:09:53 AM by AndyB »
Waveney Valley, Suffolk/Norfolk Border

Offline AndyB

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Re: 2" minnie build so far.
« Reply #23 on: October 08, 2011, 09:24:59 AM »
Brill! :clap:

Hmmm...don't know what happened to post twice...I thought it was just refreshing itself :poke:

Thanks Jason, I should have known to ask your advice :bow: :bow: :bow: :bow:

Steve/Jason: what pitch are you using/would you use for drive gears? The 1" uses 20DP gears..which just happen the be the same as Drummond changewheels (as Mr Mason points out). Just twice the size but with the same number of teeth (which is calculable but I haven't done yet)?

Andy
« Last Edit: October 08, 2011, 10:09:33 AM by AndyB »
Waveney Valley, Suffolk/Norfolk Border

Offline Jasonb

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Re: 2" minnie build so far.
« Reply #24 on: October 08, 2011, 11:14:39 AM »
When you double the scale you half the DP so 10DP would keep all the gear centers in the same place. Number of teeth stay the same.

10DP is a bit fine if you want scale appearance but as its a freelance engine anything goes and its easier to cut 10DP on smaller machines than the 8 & 6 DP on my 2" Fowler.

J

Offline sjb

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Re: 2" minnie build so far.
« Reply #25 on: October 08, 2011, 05:40:23 PM »
I have cut my gears 10dp with cutters purchased off EBAY 20-00 each. I thought it best to keep to this pitch as I didn't want to get in a complete pickle. :loco: If you look at the picture of the engine on the bench you can see the large 50 tooth wheel hasn't had all the teeth cut because I made a bit of an error... :(

The boiler isn't started I but do have the materials ready. In the main I am using 10 SWG copper plate and as Jason points out you need to play with the tube diameter. It's a trade off between getting in as many flue tubes that are not so small as to get choked or too large as to make the boiler inefficient. Consequently I'm considering using 1/2 inch flues for mine, unless Jason tells me otherwise... :smart:

AndyB. Yes I made my own rollers for the front wheels but didn't really make them big enough so had to heat the metal up bright red to get it to roll properly. The rear wheels were made out of a piece of aluminium tube, not to be recommended!

Steve :beer:

Offline sjb

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Re: 2" minnie build so far.
« Reply #26 on: October 08, 2011, 06:18:36 PM »
 :update:

Here are some pictures of the wheel buillding process. I pre drilled both the rim and the spokes with one hole only then bent and marked them ready for fitting. It's imperative that the spokes lay flat without any tension or a jallopy wheel will result. I used a rivet for location while the hub was drilled and countersunk. etc finally fix with m3 crews for the moment.

The final picture is with the wheel flipped over ready for the last 8 spokes to be fitted.

steve

Offline saw

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Re: 2" minnie build so far.
« Reply #27 on: October 08, 2011, 06:45:35 PM »
Well done sjb very nice work  :clap: :clap:
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Offline AndyB

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Re: 2" minnie build so far.
« Reply #28 on: October 09, 2011, 05:23:14 AM »
You are a fabulous chap Jason :bow: The font of all knowledge

Steve, thank you for the info and the great build log :clap: You make it look so easy...even the mistakes! I am as good if not better at making those :lol: :lol: :lol:

Thank you very much

Andy
Waveney Valley, Suffolk/Norfolk Border

Offline sjb

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Re: 2" minnie build so far.
« Reply #29 on: October 09, 2011, 07:45:01 AM »
 :update:

Voila, ready for rivets  :ddb:


Offline sjb

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Re: 2" minnie build so far.
« Reply #30 on: June 26, 2012, 06:36:08 AM »
I have been busy cutting the gears for my Minnie. Hope you enjoy them.   :wave:


Offline sjb

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Re: 2" minnie build so far.
« Reply #31 on: June 26, 2012, 06:38:35 AM »
I have made a start on the boiler too.

steve