Wednesday, November 12, 2014

44 Class Gears - Part 2

G'day,

Today I had some spare time so I drove up to Moss Vale and met up with my mate to cut some gears. He very kindly had been working on some mandrels along with a indexing plate for both ten and eleven toothed gears.

As an improvement on the original gear we made the gear 3mm wide. This may help the meshing problems a little. Another improvement, for myself was to bore the axle hole out to 2.35mm rather than 2.4mm. I have been wanting to change the wheels on my 44 class models to 88 thou wide sets. NWSL wheels (P/N 37241-4) are not a bad replacement however the axles are slightly smaller in diameter than the Chinese originals, resulting in a looser fit when mated with original muff. Drilling the muff to 2.35mm creates a nice fit with the narrower wheels.

Gear made today.

Top - Austrains Gear (C CLass)
Middle - Traino 44 Gear
Bottom - Home made, 88 thou NWSL wheels.

After a bit of trialling, we produced one gear. which we fitted to my 44 class model. The gear fits well and runs nicely. The actual cutting of the gear is quite quick however machining the blanks is a little time consuming, mainly due to not being 100% set up properly yet.



Improvements-

A slightly longer, non threaded section mandrel is required for placing the gear on when cutting teeth. This will provide a little more support.

A modified collet will have to be used for blank turning.

If the blanks were cut by a CNC lathe and the teeth simply cut by hand in the mill, the process would be quite fast. Next time up in Moss Vegas we will start a production line and try to knock a few out.

The 88 thou wide wheels look better, however some may need a little trueing on their axles. Not half as bad as the standard wheels though!

A good little experiment and I have learnt a lot.

So long,

Linton

Sunday, November 9, 2014

Armidale and a Garratt Sound File

Hi,

Over the past few weeks I have been very busy. Last weekend I got married to my beautiful, now wife Danielle. I always thought it was a cliché thing to say but it was actually one of the best days of my life. After my Liverpool spending spree, I count myself very lucky that she actually turned up on the day! Good times.

I am heading up to the Armidale Convention this Friday, something I have been meaning to do for years.

For the convention I have been fiddling around with a few sound files. Although I am not one hundred percent sold on the throttle drive mode (see previous blog post), I ended up modifying my Z13 class file along with a new AD60 file to behave in the same manner. For the life of me I can not get the 3 cylinder file to behave the same. For some reason it just doesn't want to play the game.

The Garratt sound file (video recording below) has been created using a lot of sound recording taken from 6029 in Canberra. There are still a few things to change but I thought I would share its current progress with you all. This example uses a single ESU V4 decoder, utilising the secondary drive function to create the articulated out of sync chuff beat. This is the much cheaper option, rather than using two separate decoders. The one downfall of using the secondary drive function is that it can become a little repetitive with its out of sync rhythm.

The video below shows the ESU LokProgrammer software, running an ESU LokTester fitted with a single V4 decoder driving a 15mm x 12mm Zimo sugar cube speaker. Unfortunately I am still struggling with the cameras audio auto gain settings. It corrects the varying audio levels a little too much.



I was hoping to have this file installed in my brass 60 class by now for the convention. Unfortunately my brass Garratt is still brass in colour, with no hope of this project being completed in time. The Mansfield brass model has so much space in the boiler section, leaving plenty of room for two Zimo sugar cubes, two V4 decoders and two ESU Power Packs. This will be an expensive install but fitting for such a grand locomotive. I am looking forward to hearing the two engine units running separate files, hopefully creating a more natural out of sync beat. Will have to wait and see hey.

I am looking forward to seeing a few friends, along with meeting many others at the convention. Should be a good weekend.

Thanks for looking,

Linton