Sunday, June 4, 2017

6029 Finished

Hi,

Once again, it has been a while since updating my blog. These days I find Facebook a little easier to keep updated as Facebooks photo and video sharing features are much easier to use.

Since my last installment, I have finished the Garratt, including the sound file, presented at MRNSW and hurt myself.

Garratt

I have shared some of the photos and information contained in this update in previous posts. I thought I would consolidate 6029s build in this one blog entry.

The Garratt, particularly the sound file has exceeded all my expectations. While the audio side of things isn't bad, it is the way in which I have developed the operation of the sound file that I am most happy with. The file incudes a slipping feature, where if the driver is too heavy on the throttle the front engine unit will slip. To arrest the slip the throttle needs to be shut, then re-opened slowly. The slipping feature can also be enabled/disabled by function button, just in case it gets tiring.

The Garratt project, like all my other steam projects has throttle controlled chuff intensity/duration and coasting features.

I had spent quite a few hours recording 6029 at various locations. As with nearly all my files I am never quite 100% happy with how they sound. I think its a speaker thing, something that will most likely not change much for the smaller scales.

My 6029 is a Mansfield model. I bought it from a friend and immediately stripped the paint. A few little things needed fixing and while disassembling the chassis I noticed there was room and provisions for plunger pickups. The Mansfield model as delivered was fitted with wiper pick-ups for the non chassis power side. While wiper pickups aren't bad, my model was missing a few and on other models fitted with similar set ups I noticed they were sometimes misaligned.

I wondered, why would Mansfield Models have had the holes in the chassis sides for plunger pickups and not used them? I checked the alignment of the holes to the back of the insulated driving wheel rim and they were spot on. Not only were the holes in the chassis but the insulated bushes were fitted also. I checked my unpainted Garratt and what do you know, the bushes are fitted to it also!

I went about making four pickups for fitting into the bushes on both engine units. After painting it was all assembled and seemed to work.

Original Wiper Pickup - Inboard

Plunger Pickup Construction

Completed Plunger

Plunger Pickup Fitted to Inboard Position

Plunger Pickup Outboard (front)


On to the sound install. The model is fitted with two Loksound V4s, two Zimo sugarcube speakers and two ESU powerpacks. The Decoders, power packs and speakers are fitted into the boiler section with 4 pin TCS connectors joining engine units to boiler. I wanted the 4 pin connectors secured to the engine units so as to make connecting/disconnecting easier. I made up the looms and then a soldered a brass keeper onto the inboard bogie retaining nut.




The decoders and speakers were fitted to machined Delrin mounts. These mounts were drilled, tapped and then secured into the boiler unit utilising existing holes. I hate DCC installations where everything is just thrown in the boiler or sticky taped down. It's just something that bugs me ha ha.





The two sound files that are loaded into each decoder are slightly different. One causes the wheels to spin with large throttle inputs while the other decoder locks the electric motor into the speed where the slip began. This literally took me months to achieve, mainly in making it easy to use. The hardest part by far was maintaining the appearance of both engine units travelling at the same speed once the throttle was shut. This was a real challenge.

Anyway, enough talking. Here are a few more photos and a couple of videos. Please excuse the videos, they were taken on my iPhone.





I Painted the Garratt with Mirotone Etch Primer



















MRNSW

On to something different, I recently presented at the MRNSW (Modelling the Railways of NSW) convention. It was my first time presenting at a modelling forum but I had a blast. My topic was on recording and building sound projects for locomotives. I had severely underestimated the amount of time a subject like that could consume. I only made it half way through my presentation during the first session. The sessions that followed were crowd driven, trying to discuss points of interest. In reality, I could have spoken all day on just the ESU LokProgrammer. I was kidding myself trying to squeeze the whole lot into hour long sessions ha ha. Lesson learned.

I have to thank the organisers of MRNSW as it really was a great day. Thanks!

Other Stuff

The main reason I am actually updating my blog today is that I have plenty of time on my hands. I hurt myself badly last weekend while riding a moto x track. I am very fortunate in that I can still walk. Many things ran through my head that afternoon while laying on the ground. I am a very lucky bloke in that I will recover and I have a wonderful wife who is looking after me while my mobility is limited.

Lucky for trains I guess as the hobby is keeping my mind ticking over. I am currently trying to sketch out a drive flow for the NSWGR CPH railmotor. I am trying to build something that closely replicates how the real thing operates. More to come on this soon hopefully.

That's about it for now.

Thanks for looking,

Linton



Monday, January 9, 2017

Half Baked Garratt

Hi,

I hope everybody's New Year started well.

I have not made as much progress with my Garratt as I would have liked. The front engine unit is painted and re-assembled, and it actually runs nicely. I was a little nervous as I had completely dismantled it. The plunger pickups seem to be working nicely.

The real reason for the lack in progress has come about due to sound file testing. The AD60 slipping sound file has really had me thinking. The slipping method was quite easy to achieve. In contrast the engine units re-syncing (speed wise) with each other as proven to be very difficult to get right. I am getting there and the project is fairly easy to control now.

I have included two short videos, taken on my phone. Quality is not so good, sorry!

The locomotive is made up of two Garratt models. The front engine unit is freshly painted, the unpainted boiler section is from my second model as I don't want to handle the freshly painted boiler unit. The rear engine unit is about to be stripped of its old paint.

The decoders and speakers are just sitting there for testing purposes. This will be installed in the boiler section, mounted on a machined Delrin mount.

The front engine unit will slip. This happens with a large increase in throttle position. The locomotive is running at approximately speed step 6-8. The throttle is rapidly increased up to around speed step 18. The locomotive slips and the throttle is closed to arrest the slip. After the throttle has been closed, it is slowly opened once again and the model accelerates.

There is still some work to go in regards to the project but thought some may find it interesting at this early stage. Before anybody tells me, I know the chuff timing is not right. This will be sorted once finished ha ha.



Thanks for looking,

Linton