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all the way through
Posted by Ken Leung at 2/2/2001 7:56 PM EST
Student on team #192, Gunn Robotics Team, from Henry M. Gunn Senior High School. In Reply to: Connecting hub sprockets to shafts Posted by Patrick Dingle on 2/2/2001 7:17 PM EST: : Does anyone know the most reliable way to connect a hub sprocket to a rotating shaft (no keyway)? We are planning to drill and tap the hub, and bolt slightly into the shaft. Is this reliable, or are there better ways? : Thanks : Patrick I think you probably want to drill all the way, and bolt through the shaft instead of just bolting in slightly. Some where along the line of Andy Baker’s description of attaching shaft coupling onto the drill motor output shaft. This way, you won’t have the risk of snapping the bolt on one side (or screw). And I am pretty sure you won’t have to worry about weakening the structure of the shaft, because the hub sprocket will be fitting around tightly reenforcing it. Just keep the size of the bolt resonable. Also, when there are laruge amount of force coming from the sprocket, that force will be twisting the bolt on both side, instead of the shaft pushing the bolt outward. It might take a long time to tap the hole through, but I am pretty sure it’s well worth the time. Or, as another person suggested, you can mill the shaft flat on its side. Just like the shaft of Van door motor and Globe motor, and broach a sprocket with a smaller hole to tight fit around. The flat shape is going to hold the sprocket from free spinning. Well, other then these, all I can think of is welding the sprocket onto the shaft… and that ALWAYS work. -Ken Leung |
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