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Torque loss through right angle gearboxes? Answered

What is your experience with ight angle gearboxes, like the one you show above? Early in my career, I had a project which measured torque (energy) loss and found it wasn't unusual for a 30-50% loss of torque in right angle gearboxes. These were comericial ai powered tools (Chicago Pneumatic and others) and also manual powered torque multipliers. I'd appreciate you experience as this could drastically change the powered required for an application.