N scale projects

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Re: N scale projects

Postby galaxy_gfx on 12 Mar 2018, 01:31

Some work on the DF7D mechanism again:

Lead weights and current regulator PCBs for the lighting:
http://galaxy.impulzus.com/tmp/rail/cn/ ... 0311_0.jpg

Lead weight again – this form is expected to add some more stiffness to the plastic frame:
http://galaxy.impulzus.com/tmp/rail/cn/ ... 0311_1.jpg
http://galaxy.impulzus.com/tmp/rail/cn/ ... 0311_2.jpg

I plan to install the extra powered wheelsets in the coming days and do some test runs with all four chassis.
galaxy_gfx
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Re: N scale projects

Postby galaxy_gfx on 26 Mar 2018, 01:50

DF7D again...

This week-end, all four mechanisms were completed:
http://galaxy.impulzus.com/tmp/rail/cn/ ... 0326_0.jpg

This includes PCBs for lighting:
http://galaxy.impulzus.com/tmp/rail/cn/ ... 0326_1.jpg

The lighting PCBs connect to the main frame via a pin header:
http://galaxy.impulzus.com/tmp/rail/cn/ ... 0326_2.jpg

The lighting PCB itself will be fastened to the shell with a pair of screws:
http://galaxy.impulzus.com/tmp/rail/cn/ ... 0326_3.jpg

Attaching the lighting circuit to the shell ensures that the LEDs line up perfectly with the light shafts. Also, it will be easier to block unwanted light with rubber foam padding and adhesive shades, as these can remain in place after removing the mechanism. There will be a guiding frame attached to the bottom of the cab interior assembly which will hold the separate white/red LED board in place.

Some more bottom views:
http://galaxy.impulzus.com/tmp/rail/cn/ ... 0326_4.jpg
http://galaxy.impulzus.com/tmp/rail/cn/ ... 0326_5.jpg

With the lead weights installed, each locomotive weighs in at ca. 120 g (the CMR Line DF4s weigh ca. 115 g, and the original Life-Like GP38, the starting point of the DF7D mechanism, weighs ca. 85 g). Apparently, the mechanisms will need some break-in mileage after several years of storage, but they behaved reasonably well even at the first test runs.

Meanwhile, I received some more CMR Line DF4s – the bogies of these will be used for the HXN3.
galaxy_gfx
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Re: N scale projects

Postby galaxy_gfx on 02 May 2018, 01:00

Some progress at last:

The HXN3 shell is close to ready for making the silicone mold. Fuel filler details have yet to be added, and all openings to be taped over. If all goes well, the molds will be done by the end of this week:

http://galaxy.impulzus.com/tmp/rail/cn/ ... 0502_0.jpg
http://galaxy.impulzus.com/tmp/rail/cn/ ... 0502_1.jpg
http://galaxy.impulzus.com/tmp/rail/cn/ ... 0502_2.jpg

Also, the DF7D shells are receiving details. About half of the grab irons are now soldered together (photo shows a complete strand before being cut apart), the rest will be bent to shape, including the air hoses made of thicker wire.
http://galaxy.impulzus.com/tmp/rail/cn/ ... 0502_0.jpg

I filed out some of the cast-on louvers and replaced them with open grill castings, to correspond with open rooftop louvers:
http://galaxy.impulzus.com/tmp/rail/cn/ ... 0502_1.jpg
http://galaxy.impulzus.com/tmp/rail/cn/ ... 0502_2.jpg

Hopefully, I will have more time for modelling in the coming weeks and can resume work on the box cars as well...

Cheers,
Zsolt
galaxy_gfx
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Re: N scale projects

Postby galaxy_gfx on 06 May 2018, 21:56

Raw silicone mold for the HXN3 carbody:

http://galaxy.impulzus.com/tmp/rail/cn/ ... 180506.jpg

Some "post-work" is still needed (removing excess material, cutting free venting channels, extending the cavity behind the headlight box), but things now really begin to take shape. It is going to be very busy in my other railway project (our preservation group will run two excursion trains this month), so this may be it for this month in terms of model projects, but I'll get back to the HXN3 as soon as I can.

Cheers,
Zsolt
galaxy_gfx
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Re: N scale projects

Postby galaxy_gfx on 12 May 2018, 15:25

Had a spare hour, did a first casting of the HXN3 shell:

http://galaxy.impulzus.com/tmp/rail/cn/ ... 180512.jpg

The size and the complexity of the shell are definitely a challenge. May have to re-cut some venting channels and find a better way of pushing the core into the mold to prevent bubbles, but altogether, it is possible to cast the shell quite well.

Cheers,
Zsolt
galaxy_gfx
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Posts: 30
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Re: N scale projects

Postby galaxy_gfx on 30 May 2018, 01:00

Some more HXN3 shell castings:

http://galaxy.impulzus.com/tmp/rail/cn/ ... 0530_0.jpg

Two will be finished as regular units, two will be modified to the Shenhua Group 7001–7002, and two will be set aside for later rebuild to a twin-section pair. Some smaller detail castings:

http://galaxy.impulzus.com/tmp/rail/cn/ ... 0530_1.jpg
http://galaxy.impulzus.com/tmp/rail/cn/ ... 0530_2.jpg

Some more boxcar details:
http://galaxy.impulzus.com/tmp/rail/cn/p/p_180530_0.jpg
http://galaxy.impulzus.com/tmp/rail/cn/p/p_180530_1.jpg

The P61 master is now a step closer to completion:
http://galaxy.impulzus.com/tmp/rail/cn/ ... 0530_0.jpg
http://galaxy.impulzus.com/tmp/rail/cn/ ... 0530_1.jpg

Cheers,
Zsolt
galaxy_gfx
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Re: N scale projects

Postby galaxy_gfx on 04 Aug 2018, 22:36

galaxy_gfx
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