Consequences of an Oversized Pulley Bore Hole in Conveyor Systems

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Discussion Overview

The discussion revolves around the implications of having an oversized bore hole in a pulley within conveyor systems. Participants explore the potential effects on system stability, vibration, and operational efficiency, particularly at varying RPMs.

Discussion Character

  • Exploratory
  • Technical explanation
  • Debate/contested

Main Points Raised

  • One participant suggests that a significantly larger bore hole could lead to violent shaking of the system at high RPMs, while questioning the functionality at lower speeds like 30 RPM.
  • Another participant requests additional context regarding the conveyor system's specifications, including width, pulley spacing, belt material, and the type of materials being transported.
  • It is proposed that an oversized bore hole would create an off-center load, potentially causing violent vibrations in the shaft assembly, emphasizing the need for proper bearings to maintain stability.
  • A later reply raises concerns about wear and noise, suggesting that if the bore hole is an idler, the bearing should be replaced to prevent rapid wear due to direct contact between the shaft and roller.

Areas of Agreement / Disagreement

Participants express differing views on the severity of the consequences of an oversized bore hole, with some emphasizing the potential for vibration and wear, while others seek more information to clarify the situation. No consensus is reached on the overall impact.

Contextual Notes

Limitations in the discussion include a lack of specific details about the conveyor system's design and operational parameters, which may influence the outcomes discussed.

JustinLiang
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What would happen if the bore hole of a pulley in a conveyor was significantly larger than the shaft like in the figure below:

IcUWJMe.png


I would imagine if the RPM was high, the whole system would shake violently. However, what if the RPM was around 30 RPM. Would the conveyor still function properly? At such low speeds I feel like it would still work, however, I have never seen something like this in the industrial world which is why I am curious.

The shaft diameter is approximately 1 inch and the bore is approximately 2 inches.
 
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Can you provide more context? Is this from an existing conveyor system? How wide is it, what is the pulley spacing, what is the belt material, what is being moved by the conveyor?
 
That would act like an off center load, making the shaft assembly vibrate violently. You need a bearing to keep the shaft well behaved.
 
Is the white space air? If it was an idler then the bearing should be replaced. The eccentric roller - shaft would wear very quickly since the shaft would be in direct contact with the inside of the roller. It would be noisy and cost more power to operate.
 

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