Wire Erosion Project – Restoration

Type of Work:

Restoration – Ottawa 2.5 HP open crank stationary engine

We had a rare opportunity to assist in the restoration of a piece of engineering history that was built by the Ottawa Engine Company of Ottawa, Kansas, USA in 1912. This involved with removal of the gib key holding the flywheel to the crank shaft from an Ottawa open crank hit and miss 2.5 stationary gasoline engine.

Client Requirements:

To set up and remove a seized / damaged key from a shaft in order to enable the flywheel to then be removed.

Background:
The crank gasoline engine was purchased in July 2016 from its owners in Kentucky USA and air freighted by UPS and delivered to England. On arriving in England, the engine was dismantled down to the last nut and bolt in order for it to be restored back to class one condition. During the process the gib keys holding the flywheel to the crankshaft could not be removed, despite the use of gib key pullers and a hydraulic press at a local garage. In order to avoid damaging any of the castings, the garage suggested that it be brought to us at Cheshire Wire Erosion to see if we had any way of removing it. As a result, the crankshaft with one flywheel still attached turned up at our unit in Sandbach.

Work Carried Out:

We machined it on one of our EDM Spark Erode/ Die Sink machines. The key was removed “sweet as a nut” and the flywheel came off the crankshaft perfectly, see photo of crankshaft with flywheels removed. The photos also show the flywheel after shot blasting. It also shows the gib key slot at top of centre bore with new gib key ready to be fitted.

Outcome: As the initial problem has been resolved the client is now in a position to continue with the restoration process.

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