Further progress on the Nessie project…

I've reduced the number of pinion teeth from eight to seven. The dimensions of the zig-zag piece that make the teeth have stayed the same but the extra spacing now gives the sides of the teeth more of a slope.

I've changed the way the hump wheels are constructed. The wheel is now made from two donuts and a rim. This extra space makes construction much easier.

The axle support pieces are then glue into place and the axle added.

The finished hump wheel.

Two humps will then sit above the main slider which is, in turn, driven by the scotch yoke.

From the front it will look something like this. I'll be adding a Loch Ness surface just above the level of the axles and there will be a handle attached to the drive shaft in the front centre of the box.