Rotary Hearth Oven

No. 982 is a 1000°F, electrically heated rotary hearth oven from The Grieve Corporation, currently used for heat treating machined metal shafts. Workspace dimensions measure 24" W × 11" D × 30" H with a 26" diameter hearth constructed from overlapping steel plates with 24 pipes holding pin inserts to support the workpieces.

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No. 982 is a 1000°F, electrically heated rotary hearth oven from The Grieve Corporation, currently used for heat treating machined metal shafts. Workspace dimensions measure 24" W × 11" D × 30" H with a 26" diameter hearth constructed from overlapping steel plates with 24 pipes holding pin inserts to support the workpieces. 24 kW installed in Incoloy sheathed tubular heating elements provide power, while a 1,000-cfm, 1-hp recirculating blower provides horizontal airflow to the workload. An additional cooling blower is mounted beneath the loading table to cool the parts in the front middle three positions of the hearth.

The hearth is driven by a 1/4 hp motor through a gear reducer with a torque-limiting device, variable from 0.1 rph to 0.5 rph. A loading table is provided in front of the oven to hold extra pin inserts.

This oven features an aluminized steel exterior and interior, an exhaust hood around the openings in the face of the unit with a 130 cfm exhaust fan, plus an integral oven leg stand. The 8" thick wall insulation comprises 2" of 1,900°F block and 6" of 10-lb/cfm-density rock wool.

Controls on the oven include a digital-indicating temperature controller, manual reset excess temperature controller with separate contactors, recirculating blower airflow safety switch, fused disconnect switch and a 10" circular chart recorder.