Bash Fodder for GN15 Mechanisms

For discussion of the issues faced when building a model or layout - how to replicate wood, what glues to use, exactly how much weathering can a Gnat take, a good source of detailing accessories - you get the picture, I'm sure.

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Steve Bennett
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Postby Steve Bennett » Sun May 18, 2008 11:07 am

Bachmann Trolley mechanism in both original and shortened form as per Will's description above.

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Postby Oztrainz » Thu Oct 30, 2008 8:58 pm

If you are after a cheap all-wheels powered four wheel unit, also have a look at Bachmann's HO bogie PCC steamline tram. It provided the motive power for "Gniffy" the diesel mancar in the Tom Waites Challenge
http://forum.gn15.info/viewtopic.php?t=3108&postdays=0&postorder=asc&start=50

I can't get any photos of the full mechanism, because I glued it in permanently :oops:

Some dimensions are:
wheelbase 21mm
wheel diameter 8.5mm
max width at sideframes 26mm
max length 30mm
I used 0.040" styrene glued to the top of the bogie sideframes to give me a foundation to build from.
Last edited by Oztrainz on Thu Oct 30, 2008 9:23 pm, edited 1 time in total.
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Glen A
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Postby Glen A » Thu Oct 30, 2008 9:10 pm

Oztrainz wrote:If you are after a cheap all-wheels powered four wheel unit, also have a look at Bachmann's HO bogie PCC steamline tram. It provided the motive power for "Gniffy" the diesel mancar in the Tom Waites Challenge
http://forum.gn15.info/viewtopic.php?t= ... sc&start=0
I can't get any photos of the full mechanism, because I glued it in permanently :oops:


Are you sure that link is right John?
It takes us to a speeder built on the Gandydancer.

I am interested to see the PCC bogie though

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Postby Oztrainz » Thu Oct 30, 2008 9:25 pm

Hi Glen, thanks for that, the link should have been:
[url][url]http://forum.gn15.info/viewtopic.php?t=3108&postdays=0&postorder=asc&start=50[/url][/url]
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Postby Oztrainz » Thu Oct 30, 2008 9:48 pm

Glen A wrote:I am interested to see the PCC bogie though


I am having a look at how I can extricate the bogie without totally shredding "Gniffy". At present it is looking a little "iffy" as I appear to have been a little "too generous" with the super glue and hot glue when I put it together. I'll post a photo here when/if I can get the power bogie out into the open. The tram also comes with a lighted interior. I used those globes to provide lighted head and tail lights for Gniffy and they are glued in as well. :(
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Postby Oztrainz » Sat Nov 01, 2008 10:15 am

Hi all,
Gniffy has been decapitated to reveal the Bachmann HO PCC tram power bogie. It has a thin pancake type motor.

The block is about 40mm high but only about 18mm wide and about 30mm long. There are 2 contacts that would have faced inboard that add about another 10mm to the clearance required. These contacts had wires running to the light globes and the other bogie that was unpowered and was for additional electrical contact only.

Gniffy's printed card floor and .040" styrene base is still attached to the bogie sideframe support.

Photo 1 is a 3/4 view from above and one side
Image

Photo 2 is an end on view
Image

Photo 3 is a side on view of the brush side of the pancake motor
Image

Photo 4 is a side on view of the other side
Image

Photo 5 is a view from below showing wheel spacing and gearing between the wheels - this ought to be the immediate identifier for one of these mechanisms. The other bogie of the PCC tram only has electrical contacts.
Image
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Postby DCRfan » Sat Nov 01, 2008 10:40 am

Paul
Gnu Zealand

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Postby steerngo » Sat Nov 01, 2008 6:20 pm

DCR fan
electricity :lol:

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Postby DCRfan » Sat Nov 01, 2008 8:25 pm

steerngo wrote:DCR fan
electricity :lol:


OK :lol: but AC or DC, 240v or 110v or 12 v :wink:
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Postby Prof Klyzlr » Sun Nov 02, 2008 1:34 am

Dear Paul (DCR),

IIRC, the "ballast regulator" is only powered on one bogie,
(IE 2 axle drive), with the <newer> versions having a can motor buried in the body, inboard of the LH bogie (judged from your posted pic).

I'm taking a stab in the dark here,
but judging by the "Plastic looking" front wheels,
and the "metal looking" rear wheels,
I suspect the "roadrailer schoolbus" is a single axle powered,
single axle pickup mech....

(Think of a NWSL "Flea",
or even better, a SEM "Black Bug"
http://home.waterfront.net.au/~sem/bbeetle.htm )
Happy Modelling,
Aim to Improve,
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Postby michael » Sun Nov 02, 2008 2:03 am

I recognize those bricks in the first pic John :) Macton is everywhere :roll:
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Postby Oztrainz » Sun Nov 02, 2008 7:07 am

Hi Michael,
Yep - it is the test rig for the RS&W - much more photogenic than my garage door that I used for the Simple speeder :twisted:
Last edited by Oztrainz on Sat Nov 08, 2008 12:17 am, edited 1 time in total.
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Postby Glen A » Sun Nov 02, 2008 7:24 pm

Hi John,

Thanks for going to the trouble of getting those photos. Another motor unit I need to keep an eye out for....

Glen.

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Postby Giles B » Fri Nov 07, 2008 6:31 pm

Was Ben - now Flora!

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Postby John New » Fri Nov 07, 2008 7:28 pm

Was Ben - now Flora!


Cross-dressing locomotives; is that is why tram engines have skirts?
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Postby Giles B » Sat Nov 08, 2008 12:14 am

John New wrote:
Was Ben - now Flora!


Cross-dressing locomotives; is that is why tram engines have skirts?


Flora first, and the next loco might be Philip (otherwise known as Philly - to keep up the "spreadable" references?) No, it will be Daisy, suposedly named after the daughters of the railway's first owner.

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Postby Dallas_M » Sun Nov 09, 2008 6:05 am

Hello Gnatterboxers --

Another contribution to the "fodder" thread ... I've picked up a couple of the Bachmann HO highrailers for some On30 kits I'm working on. Looks like these will be quite useful for this crowd as well! :D

Image

First one I've disassembled and photographed is the Bachmann #46207 1950's 4x4 Highrailer (HO). This is a NICE little mechanism.

:arrow: The little auxiliary wheels are easily removed! :D

Image

Runs slow and smooth. The body is plastic and all the weight is in the chassis. (Approx. 1.5 ounces or 40 grams)

Image

Wheelbase is approximately 31.5 mm, wheels are approx. 8 mm diameter.

Image

And now the Gn15 "bonus" photo ... 8) ... here's the 4x4 Highrailer mechanism under Steve's Gnat chassis. (I shot it on the same white background which makes the off-white resin castings nearly disappear ... the B&W version is the quickest "fix" without shooting new pix. Hope it helps!)

Last month kept me "crazy busy" developing a new web site ... now I'm catching up on some On30 projects and new kits ... then I can get back to my Gn15 Hillbilly Rail Truck for fun! 8)

I'll be dissecting some of the other highrailers as time allows and will post photos if y'all find them useful. :wink:
Cheers,
Dallas

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Postby DCRfan » Sun Nov 09, 2008 8:44 am

Paul

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Postby rue_d_etropal » Sun Nov 09, 2008 9:45 am

looks a better chassis than it used to be. does it pick up on all 4 wheels?
Simon Dawson
(Simon D.),
Narrow gauge Francophile interested in 1m, 60cm,50cm , 40cm and smaller gauges . Build in scales from 1/6th to 1/24th. Also 1/32nd and 1/35th using 16.5mm track to represent 50cm and 60cm gauges.
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Postby Dallas_M » Sun Nov 09, 2008 10:01 am

rue_d_etropal wrote:looks a better chassis than it used to be. does it pick up on all 4 wheels?


Hi Simon --

Yes. :!: :D The wheels are on half axles which plug into plastic gears at the center. The four half-axles make electrical contact thru the metal frame pieces. (Two-piece metal frame, separated)

And, if you wish, you can leave those dinky little wheels in place, as they also make electrical contact and serve as auxiliary wipers. (Not very attractive, but on a model with outside frame pieces like the Gnat, they might be sufficiently hidden from view.)

Paul --

Oh no, "great minds" ... I feel so very sorry for your fragile mind! :lol: :lol: :lol: Speaking of fragile minds, after following your link, I recalled seeing your conversion before ... this mechanism is nice for its weight and low profile, eh? :wink:
Cheers,

Dallas



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Postby Dallas_M » Sun Nov 09, 2008 10:03 am

PS -- There are FOUR different highrailers in the series ... the 4x4 is the smallest one. I'll post more photos as I get into the others.
Cheers,

Dallas



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Postby Giles B » Sun Nov 09, 2008 11:00 pm

[quote="Dallas_M"]

Image

How do you propose fixing the chassis to the mechanism - doesn't look like there's much room to get a self-tapping screw into, for instance.
I'll be watching developments with interest.
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Postby Dallas_M » Mon Nov 10, 2008 12:40 am

Giles B wrote:How do you propose fixing the chassis to the mechanism - doesn't look like there's much room to get a self-tapping screw into, for instance. I'll be watching developments with interest.


Hi Giles --

If you look at the middle two photos in my initial post, you'll see that theres a little ridge on the mechanism that makes a friction fit to the HO plastic body.

For my On30 kit, I'll probably take advantage of this and make a casting that "snaps" in place on the mechanism.

:arrow: For Gn15 conversion, it would be fairly simple to epoxy a piece of plastic angle stock to the flat recess on either side and screw that to the superstructure. And if you let the imagination run, there are similar options to make "interlocking" connections using styrene strip, channel, angle stock, etc. ... and I think a few have even used "blue tack" adhesive to mount Spud drives ... a dab of silicone or other removable adhesive can be used ... numerous possibilities.

If I remember, I'll post a photo of the On30 frame once I get those rolling ... meanwhile, maybe Paul will chime in about how he mounted the mechanism on his conversion.
Cheers,

Dallas



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Postby scott b » Mon Nov 10, 2008 3:51 am

Giles and Dallas, The "blue tac" or even two way tape work for any of these small locos particularly if you may be using one mech for a variety of locos.
Brian F. put me on to this method a while back and I know he has been using that method for ages and it`s worked for me for a few years now.
Scott B

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Postby DCRfan » Mon Nov 10, 2008 8:09 am

Dallas_M wrote:If I remember, I'll post a photo of the On30 frame once I get those rolling ... meanwhile, maybe Paul will chime in about how he mounted the mechanism on his conversion.


Double sided selotape :oops:
Paul

Gnu Zealand


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