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.
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.