THe Mechanism Kit

This kit is intended to provide all the parts you need to assemble a first class working mechanism of the type supplied in modern diesel or electric locomotive models. The principle might also be extended to trolley/tram models if there is sufficient interest.

All the parts necessary to construct the chassis are supplied, two InLine bogies, motor with twin flywheels, motor mounting with silicon sound insulator, two drive shafts with universal joint components and the necessary screws and hardware and a piece of FR4 fibre-glass reinforced epoxy board.

But you will need to do the work of cutting the board to shape and size, drilling the necessary holes and fitting the drive shafts. A set of detailed instructions are supplied with each kit to assist you in assembling the mechanism. The kit requires a moderate level of skill, but in general no more than possessed by the average kit-basher.

There are some restrictions placed on this kit in order to ensure a practical result for the modeller. The first is that it is not suited to N scale applications, and therefore 9mm gauge is not offered. Also, the smaller wheel sizes are not offered, so the wheel selection starts at 7.6mm. Finally, the smaller motors are not offered, the MHK1024 being the minimum size offered. The reason for the minimum motor size is that the smaller motors will simply not develop enough power to do the job.

What you need to know..

To order this kit you will need to know the primary dimensions of the mechanism, such as the wheel size, axle spacing or wheelbase, the bogie centres, maximum internal width, height and the maximum scale speed you wish the model to run at. All these factors are important, and we need to know them so we can tailor the kit to your requirements, or so we can check that the kit will fit and/or do the job you intend it to.

Please remember, this kit is not an off-the-shelf product. It is manufactured to the specifications you choose and there are no mass productions techniques used. So you need to be careful in what you choose because you will end up receiving exactly what you ordered, whether it is what you wanted or not. And once constructed, we cannot take the product back and return your money.

We will use the data supplied by you to check the design and make sure it can be made up before we begin. If there is any doubt, or we think something might be amiss, we will contact you first and clear up the matter.

So, if there is any doubt about what you need, or your ability to make the correct choices, please contact us by email or by telephone (+61 3 5629 1100) and discuss the project with us first.

Total Number of Axles..

The total number of axles can be either 4 or 6, meaning a Bo-Bo or Co-Co configuration. The 6 axle version adds a further $20 to the cost, and will be built with lateral action on the centre axle. There is no choice of having a rigid centre axle.

Bogie or Truck Gauge..

A limited choice of gauges from HOn3 or 10.5mm up to S or 22.42mm are offered. There is a deliberate decision not to offer 9mm gauge because firstly the mechanism is not suitable for N scale, and 9mm units are just far too hard to make. This might seem unfair, but a 9mm InLine bogie takes approximately 2.5 times more time and effort to produce than any other size. Likewise, the mechanism is not suited to larger gauges either.

Wheel Size..

Again a limited range of wheel sizes are offered. The smaller wheel sizes have been removed from the list because we do not believe they are practical in a project like this. And, as before, they take considerably longer to assemble and get working properly.

Gear Ratio..

The In-Line bogies can be optioned with either the standard gear drive or the belt-drive. The gear drive is the more conventional method, but is inherently noisy, whereas the belt-drive is quieter.

The drive belt is no ordinary rubber, but rather a synthetic type called EPDM, with enhanced characteristics suited to this type of drive. Please do not confuse this drive system with the old Athearn rubber band drives, it is a far more sophisticated drive than that. The belt is a precise square shape, 0.6mm square, and it runs in a 'V' groove machined into the brass pulleys for better grip.

This option has come about due to the need to find ever-quieter drive systems, and this is one way it can be done. The Elastomeric Drive also means a reduction in the length of the In-Line drive, shortening the amount of overhang at the front end. A tiny ball bearing supports the side load introduced by the band tension to reduce wear.

The drive will be offered in two gear ratios, 15 to 1 and 27 to 1, and will not replace the geared version of the In-Line, but rather supplement it. Your choice should be determined by the type of operation you expect the model to work in. A slow speed shunter or switcher would probably be best with the 26:1 or 27:1 ratio, while a fast mainline locomotive would be better with the 15:1 option.

This is why we ask you to nominate the maximum scale speed you expect the model to achieve. We use that figure to see if the drive ratio is appropriate to the task, and if we think it is not, we will contact you to say so.

In general, the 26:1 ratio is for slower models, while the 15:1 ratio is for faster models.

A spare belt will be supplied with each unit, and the belts are utter simplicity to fit.

Supplied Motor..

Our view is always that you fit the largest sized motor in a model that will fit. This helps to ensure that the motor is not stressed and runs cool. However, you may have very good reasons to choose a particular motor, so you are given a choice.

At the same time, one of the options is 'Don't know, go for the best fit', which allows us to make the choice for you. We will make that choice based on the information you provide including the maximum internal dimensions of the model and the maximum scale speed the model should run at.

Wheelbase(s)..

What we need from you here is the axle spacing. It can be entered in millimetres or inches, however we ask that you indicate if it is in inches by using the double quotes ("). If the bogie or truck is a three axle unit, enter the two values separated by a plus sign, as in: 22 + 26.

The first number entered in a three axle entry will be nearest the front of the locomotive, or the outside. The second value is between the two inner axles.

Bogie or Truck Centres..

This information is not actually needed as part of the kit assembly, but is used to check that the kit can be made up. We use this to see if the motor selected will fit in between the bogies and a usable length drive shaft can be fitted. If not, we will contact you to alert you to the problem.

Maximum Width..

This dimension is used to enable us to choose the correct bogie mounting bolster and also that the motor will fit inside the model once assembled. What we need you to do is measure the width inside the body at its smallest point and enter this value.

Maximum Height..

Once again, this value is used as a check. We need to know the height inside the body from the top of the chassis plate to the lowest point of the roof. The chassis plate is 1.6mm thick if you need to take this into account.

Maximum Scale Speed..

Again this is used as a check, or is used to determine which motor would be best for the job. Please enter the speed in either kilometers/hour or miles/hour, but please put KPH or MPH after so we know too.

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