Differential Shimmed and Jigged

crown wheels for the differential

In order to get the differential running smoothly I had to shim and make a simple jig. My original differential for the Burrell used bevels with a 20° angle. These kept locking / binding. Luckily JG pointed out my errors and made a number of calculations to come to 9.5° as the correct angle. As … Read more

Burrell Gearing

Burrell and new domed smokebox door

I’ve been thinking about the Burrell gearing for some time. Calculating the overall ratio, estimating the maximum torque and speed of the traction engine. Looking online a Mamod TE1a traction engine flywheel speed is between 2000rpm and 2500rpm. 1st stage engine to layshaft is 4:1 reduction 2nd stage layshaft to rear wheels is 4:1 reduction … Read more

Burrell Door Lock

Burrell

The Burrell door lock is a T-head bolt with flat sides on the threaded section. This bolt goes through the door from the back, a handle with a slot then goes on allowing the bolt to be rotated. A second handle with a threaded not then allows the bolt to be pulled up tight. In … Read more

Burrell Traction Engine Cylinder

Burrell Cylinder Block

The Burrell traction engine cylinder is a complicated part, especially when at 1/20th scale. This might have been made more complicated by my design. However, this page is all about describing the design and following as I make and assembling the parts. Design Concept Ideas The design has taken me back to one of the … Read more

Burrell Crankshaft

Burrell Traction Engine

The traction engine is starting to take shape, but the Burrell crankshaft looks like it needs some thinking about. The issue is the clearance between the top of the firebox and the shaft. OK, this is not the correct shaft yet as I haven’t finally reamed the bearings to size (4mm). However, it demonstrates the … Read more