4.5 mm diameter sprocket with 1 mm hole

[Sven]

I'm using a Minitrix Glaskasten chassis for a home built locomotive and will replace the small wheels with 9 mm spoke wheels. The problem is that the current wheels and sprockets are mounted on an 1.2 mm axle. As I don't have the tools to drill everything up to 1.5 mm, I have to find a sprocket with a 1 mm centre hole and 4.5 mm outer diameter. The sprocket has 13 teeth. Does anyone know where I can buy a sprocket this small?

[Graeme Dunbar]

With care, you should be able to enlarge the hole from 1.2 mm to 1.5 mm with a fairly inexpensive set of cutting broaches, e.g.
http://www.myhobbystore.co.uk/product/18952/cutting-broach-set--06-to-20mm-br2194/?source=2

It may be easier and cheaper than trying to find a match unless someone knows for sure of an exact one and you will have a very useful addition to your tool box.

[Sven]

I think I might even have things like that, I could give it a try... The risk is that I would also have to do te holes for the axles, which will almost guaranteed make the train wobble. It is impossible to align all four "exits" perfect.

Is there no "Amazon" for sprockets and alike? It would be great to have a kind of starters box with all shapes and sizes, to try things out.

[Hedzer]

you van try https://www.shop.kkpmo.com/ it has all kind of gears in various modules and hole diameters.