Jolt Transparency Enhancer Steel Reduction Gear Set 74T & 34T 8 DP 3" 1.5"

Jolt Transparency Enhancer Steel Reduction Gear Set 74T & 34T 8 DP 3" 1.5"

This is a matched two-piece steel spur gear reduction set pulled directly from a Jolt Transparency Enhancer unit. The set consists of a large 74-tooth drive gear and a smaller 34-tooth driven gear, both machined from black anodized steel at 8 diametral pitch (8 teeth per inch). The two gears form a reduction pair with an approximate 2.18:1 ratio. Tooth profiles on both gears are clean and intact with no chipping or breakage visible.

Specifications & What's Included

• Set includes: one 74-tooth large spur gear and one 34-tooth small spur gear
• Diametral pitch: 8 DP (8 teeth per inch) — both gears matched
• Large gear: 74 teeth, approximately 3" outer diameter
• Large gear shaft bore: 10.0 mm
• Large gear shaft retention: 0.10 mm keyway
• Small gear: 34 teeth, approximately 1.5" outer diameter
• Small gear shaft bore: 8.0 mm
• Small gear shaft retention: clamp hub with flat
• Material: black anodized steel
• Approximate gear ratio: 2.18:1 (74T ÷ 34T)
• Pulled from a Jolt Transparency Enhancer unit

Applications

The Jolt Transparency Enhancer was an overhead projector accessory used in presentation and audiovisual settings to improve the brightness and clarity of projected transparencies. Reduction gear sets like this one transfer motor drive between shafts at a stepped-down ratio, controlling the rotation speed of a mechanism such as a lens adjustment, lamp carrier, or film transport within the unit. These gears are directly suited for repair or restoration of a Jolt Transparency Enhancer. The 8 DP pitch and black anodized steel construction are also common in small industrial and office equipment drives, making the individual gears potentially useful as replacement parts in other mechanisms requiring the same pitch and bore dimensions.