Albert wrote:Hi all,
I thought this: HORNBY X6305 COMPLETE DRIVE UNIT 4 VEP (R2947) MOTOR BOGIE NEW OO GAUGE would make a fine drive unit for a little critter in 1:35.
It came unwired so I had do that first. But it also came with two anti-slip tires and I feel those are to thick. It waggles on three wheels an runs very poorly, when it runs at all.
I tried to change the wheels but the axels are 2,5 mm and I have only 2 mm wheels......
Mission failed, but, Has anyone a good idea how to make this thing run well?
I'm not surprised that the bogie ran poorly. If its an individual motor bogie then it must be fairly old - Hornby switched to using a single central motor driving the bogies via shafts years ago.
Does it have a short, large diameter, 'pancake' motor? If so, then it is the bogie I think it is. I used a few in 00. While they could be relied upon to start when required, getting them to run slowly was impossible. The class 121 'bubble car', for instance, would always jump straight from static to a scale 30mph.
If you want great running the bogie will be useless. It is not 'a fine drive unit'. However, you can make it a usable runner (i.e; will start and stop as commanded and run steadily if rather briskly) by:
1. Adding more pickups on more wheels. These bogies were always designed to operate in tandem with an unpowered bogie which had 4-wheel pickup. If you haven't got more wheels on the loco then you could make direct-to-rail-head pickup skates from springy copper, which shouldn't be too conspicuous if they are chemically blackened (except on the contact surface, of course). If you go down the replacing tyred wheels with normal wheels route then those wheels can of course help out too.
2. Putting a weight over the bogie. The bogie is fairly light so the wheels make poor contact if there is no assistance. All the models these bogies were fitted to had large lumps of ballast weight in the bodyshell.
3. Thorough cleaning of all the electrical contact surfaces. I have a feeling that 'new' may in this case mean 'not previously used' rather than 'recently made', so surfaces such as the wheel back to pickup face surface may have oxidised in storage.
I'm not sure about replacing the traction-tyred wheels with regular wheels. The traction tyres are there to give it sufficient pulling power to handle longer trains. But if the loco is only meant to pull a few wagons on level track then it might not be an issue.
Hope this helps,