Keyed serpentine pulley with a 5/8 bore to mount on a motor

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    Motor Pulley
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Discussion Overview

The discussion revolves around finding a suitable serpentine pulley with a specific outer diameter (3.0in to 4in) and a 5/8 bore for mounting on a motor shaft. The context includes challenges in sourcing such a pulley, particularly for applications outside of automotive use, and considerations for reducing motor RPM effectively.

Discussion Character

  • Exploratory
  • Technical explanation
  • Debate/contested
  • Homework-related

Main Points Raised

  • One participant expresses difficulty in finding a serpentine pulley that meets the specified dimensions and requirements, noting a potential solution found online is too small for their needs.
  • Another participant advises checking center distances and wrap angles, suggesting that a 3-inch sheave may not provide adequate wrap with a 16-inch wheel.
  • A participant inquires if anyone has successfully sourced a similar pulley for a hydro pump application, indicating shared interest in the problem.
  • One participant describes a DIY solution involving modifying a standard serpentine pulley by drilling and welding to fit the motor shaft, suggesting a practical approach to the problem.

Areas of Agreement / Disagreement

Participants do not appear to reach a consensus on sourcing the pulley, as multiple approaches and challenges are discussed. The discussion remains unresolved regarding the best solution for the pulley issue.

Contextual Notes

Participants mention specific dimensions and RPM requirements, but there are no detailed calculations or specifications provided to clarify the implications of these choices. The discussion also reflects varying levels of experience and resourcefulness among participants.

Who May Find This Useful

Individuals interested in mechanical engineering, DIY projects involving pulleys, or those facing similar challenges in sourcing specific components for motor applications may find this discussion relevant.

Blake Kopachena
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It needs to be 3.0in to 4in OD, the belt which it will drive will have 6 grooves. It will be mounted on a motor shaft and there also has to be a way to tighten it with a screw securely. I am having a really hard time finding one, which is understandable since they are commonly used on automobiles, rather than motors.

I found a 2.2in OD pulley on ebay which VERY closely matches what I am looking for but... It's too small and the rpm on my secondary pulley will not be fast enough
http://www.ebay.com/itm/Craftsman-Ridgid-2-2-Inch-Diameter-Serpentine-Pulley-5-8-Bore-Aluminum-Alloy-/201021166566

My secondary pulley is actually a small bicycle wheel (16in) I found in a back alley. I know it's not proper, but I am trying to save money, a pulley of the same size is quite expensive. The whole goal to reduce the motor rpm to about 300-400RPM from 1725rpm. I am trying to avoid using lots of pulleys to obtain this rpm.

Could someone help me?

Thank you
 
Last edited:
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Make sure you check your center distances. The wrap angle on a 3 inch sheave will be potentially too small between it and a 16 inch wheel.
 
Did you ever find this? I need the same thing for a hydro pump!
 
I purchase an ordinary serpentine pulley with that diameter. Got a metal block smaller than the pulley, drilled a hole dead center of it with same diameter of motor shaft. I then proceeded to trill a small hole at the side for a bolt to be inserted and tightened. Finally I welded it onto the pulley after sticking both it and the pulley on motor shaft so they were perfectly aligned.
 

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