Gear box

This shows one of the eight gears being hobbed by the system described in Model Engineers Work Shop magazine of October
2003. The 90 to 1 rotary table is driven by a stepper motor by 2 to 1 tooth belt. The hob shaft drives an encoder by tooth belt to generate 18,000 pulses per revolution.Synchronism is achieved by
three numbered digital switches. The number of teeth required is dialled, the table is set to cut parallel teeth, the gear blank of correct diameter is fixed to the rotary table by a morse taper arbor. The teeth are cut in one pass


This is the gear cluster mounted in the case before the bottom was welded in place. The gear at the top is low gear which meshes with the reverse gear idler cluster.







This is the final drive shaft with steering clutches and bevel gear.
The bevel gear and pinion shaft were salvaged from a disk sander .




This is the gearbox cluster and spline shaft. The spline shaft extends through the rear of the transmission as the power take-off. The cluster shows from the left, low gear, top gear in the centre and second gear on the right.


This is half of the ball cage for the throw-out bearing (part of the steering clutch) being machined from brass. Two sides are riveted together capturing the 16 1/8" balls. There is one for each clutch.







The completed thrust bearings.