Half-Scale Gardner Model 0 Build – Part 2 of 2

Peter Rooke finishes the Gardner Model 0 scale engine after finishing the remaining pieces and resolving issues with the gas feed and mix.

| February/March 2019

01-half-scale-gardner
Photos by Peter Rooke


Manufacturer : Alyn Foundry, North Wales, U.K.
Year : N/A
Serial No. : 2292
Horsepower : 3/4hp @ 450rpm (full-size engine)
Bore & stroke : 1-3/8in x 2in
Flywheel : 9-1/2in
Ignition : Hot tube
Governing : Volume
Cooling : Tank-cooled
Weight : 39lb

06-assembly-trial
The completed gear and eccentric assembly trial fitted together.

The kit of parts included two cut gears, with the only work necessary being to drill and tap the smaller gear for a lock screw above its keyway. The main gear was mounted on a bronze bearing mounted on a shaft fitted to the engine block. A spiral oil groove was cut in this shaft to help lubrication. The stub for this shaft fitted in the engine casting and it was turned 0.037 inch off center, thus providing a means to adjust the backlash and the degree that the two gears meshed.

02-offset-hole
Drilling the offset hole for the eccentric for the timing gear.



The two eccentric straps were machined from the supplied castings and their holding discs were turned from 1.125-inch-diameter steel, with the hole for the shaft offset by 0.125 inch. These holding discs were fitted either side of the main gear wheel, and all shared the same bearing.

04-eccentric-strap
Setting up to drill the eccentric strap.

Kurt
4/2/2019 6:30:34 PM

A wonderful storey of determination and patience. It would be great to add a link to a short video of it running to see and listen to! Thanks for sharing!


Rob Bearden
4/2/2019 7:05:58 AM

What a beautiful job .Thanks for sharing. Rob




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