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A 2mm Workhorse


2mm Andy

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or "yet another part-complete loco!"

 

At the excellent 2mm Golden Jubilee Expo in Oxford last July, I bought one of the Worsley Works etches for an 02 shunter. Of course, I then put the packet in the cupboard and forgot about it while I got on with some other modelling. The real things look like this:

 

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Anyway, after a few months, the kit came to the top of the pile again and I decided to make a start on it. The etch comes complete with a simple etched chassis which i decided to discard in favour of using milled pcb frames with brass spacers and with an integral gearbox.

 

The chassis outline was drawn up on AutoCAD using the dimensions taken from the etch parts and with a gearbox design courtesy of Missy. I decided to use a Nigel Lawton 'midi-motor' (this seems shorter (and substantially cheaper!) than the Faulhaber 0816 which was the motor I'd originally intended to fit. By playing around on CAD, I got to a design which I felt would work and which would allow me to use the footplate from the original etch with minor modifications hacking.

 

blogentry-8055-0-47020900-1298407453_thumb.jpg

 

Two small pieces of 0.5mm pcb were then set up on my Proxxon mill, the axle/gear positions drilled and the frame outline milled out.

 

After reaming out the holes to take the bearings (phosphor bronze soldered in from the inside of the frames), I bolted up the frames with temporary spacers and gears on turned plastic muffs supported by a selection of handy drill bits to see if it would work....

 

blogentry-8055-0-10349300-1298408148_thumb.jpg

 

... and it did B) :lol: !

 

The frame spacers in the photo are a terrible bodge - milled brass blocks (to get some weight low down in the mechanism) will be used, tapped and screwed to the side frames, and the main frames gapped around these to prevent the whole lot shorting out. I intend using the 'Simpson' springing method to improve the current pick-up, but for now progress has stalled while I order some drills and other bits (which I forget to get at the weekend when I was at the Watford show :rolleyes: ). There is still plenty of work to do, but I think the hard bit has been done.

 

And after this one, there are another 3 shunting locos to do! :blink:

 

Andy

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I have seen this for real and it is a very neat piece of work as you say Andy the hardest bit is done. I will be interested to hear how you get on with the Nigel Lawton motor as I have some but never used them yet.

 

Its nice to see a blog post again, please keep them comming.

 

Missy :)

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Nice work Andy - This sort of stuff is a million miles away from me at the moment so its fascinating to see how its done.

 

Any progress on the body shell itself?...

 

As Missy says, try not to fade away again!...

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Thanks for the kind comments everyone!

 

Hi Missy

 

I'm looking forward to trying the Nigel Lawton motor. At a fraction of the price of the Faulhaber motor (which Branchlines have now sold out of apparently), it's got to be worth a punt! Friends who have tried it have been pleased with the results, so I'm quite hopeful. I will have to order a couple of motors from Nigel soon - the one I have here has been robbed from a narrow gauge kit waiting to be built.

 

Hi Pete

 

Thanks. That makes me sound like a dodgy lightbulb! :P I have every intention of posting regular updates, but my modelling seems to go in cycles, and it can be quite a while between bouts of enthusiasm and time. I'll try harder in future! :D I have made a start on soldering the cab together, but I really need to get the motor in position to see where the footplate needs modifying before I can assemble everything. I will probably build up a few sub-assemblies though - cab, steps, etc.

 

It isn't that far from your modelling - this sort of thing could be done without the milling machine; it's just that I was lazy and wanted to have a play with my toy! Marking out and cutting pcb is very similar to cutting parts for one of your buildings.

 

Hi Tony

 

The coupling rods are part of the etch. I measured the centres using some calipers and transferred the dimensions to my CAD drawing (and then to the milling machine), so the centres of the rods will hopefully be close to those of the frames!

 

Andy

 

 

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Any chance (if I ask nicely) if the CAD drawing of the chassis be made available to 2FS members,im trying to sum up the courage to have a go at a chassis and this looks to be an excellent idea and incentive to have a go.......... thanks in advance Michael

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Michael,

 

That shouldn't be a problem. I would like to get the basic chassis working under power first though before I make the CAD file available - I wouldn't want to give you duff information!

 

Andy

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Andy, your chassis is looking good so far and I rather like your plan to use the NL motor. I've a couple of these that I'm looking to try in a re-wheeled 57xx and it will be good to get a wider feel for their consistency, reliability, and effectiveness.

 

Any chance (if I ask nicely) if the CAD drawing of the chassis be made available to 2FS members,im trying to sum up the courage to have a go at a chassis and this looks to be an excellent idea and incentive to have a go.......... thanks in advance Michael

 

Can I second Michael's request for the CAD file, like many 2mm modellers, I appear to have picked up a WW Class 02 and would like to have a go at simple chassis which would allow me to justify more practice on my mill :)

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Andy,<div><br></div><div>This is looking very nice. You can see some photos of my attempt at a Class 06 (Judith Edge etch) with a Nigel Lawton motor on my blog <a href="http://ayeates2mm.blogspot.com/">http://ayeates2mm.blogspot.com/</a>. My work is much less neat, and doubtless less accurate than yours. I used one of Nigel's rubber bands as the first stage in the reduction, which ended up giving me quite a high overall gear ratio. I also had the idea that the rubber band would reduce the side loading on the motor compared to fitting a worm directly, but I haven't tested this in any way.</div><div><br></div><div>Since I posted the photos, I got the mechanism to work again (the fault was the end of the gear shaft rubbing against the side frame), and fitted the side rods and jackshaft. Then I managed to break one of the wires (I think) where it enters the motor casing. I must have flexed it too much while testing and developing the mechanism. I'm currently waiting for a replacement motor to arrive, but the loco looks like it might run!</div><div><br></div><div>Anthony </div><div><br></div><div><br></div>

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Can I second Michael's request for the CAD file, like many 2mm modellers, I appear to have picked up a WW Class 02 and would like to have a go at simple chassis which would allow me to justify more practice on my mill :)

 

I think you already have one!

 

Missy ;)

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Hi Steve,

 

It sounds as though you have a copy of Missy's CAD drawing anyway, but I'd be happy to forward my version. I used the same gear reduction as Missy but moved the gears around so that I could bring the motor towards the middle of the loco. This, combined with the use of the Nigel Lawton motor (shorter than the Faulhaber), means that i don't have to cut so much away from the footplate etch. I guess it all comes down to laziness on my part :rolleyes: !

 

There is a good article on the 2mm website here which is well worth a read (as is Anthony's blog mentioned above).

 

Anthony,

 

I had read your blog entry. It sounds like the narrow bonnet on the 06 makes it quite awkward to fit a drive mechanism in. I'm quite lucky that the 02 had a wider bonnet. The Hunslet DY1 (my next shunter project) has an even wider bonnet, so I will stick with the 8mm dia. Nigel Lawton motor I think.

 

I have an 009 kit for a Ruston Hornsby loco that uses the Nigel Lawton belt drive and a layshaft fitted with ball bearings. It was my intention to write the construction up on my blog here when I built it (no promised when that will be!)

 

Andy :)

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Can I second Michael's request for the CAD file, like many 2mm modellers, I appear to have picked up a WW Class 02 and would like to have a go at simple chassis which would allow me to justify more practice on my mill :)

 

I think you already have one!

 

Missy ;)

 

Yep, found it :rolleyes: Heave sigh of relief! I'd deleted the folder where I'd saved the drawing, but fortunately found I'd still got the original archived email.

 

Thanks :D

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