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Replacement rotor for CNC spindle drive CNC 3020/3040

by suf, published

Replacement rotor for CNC spindle drive CNC 3020/3040 by suf Jun 29, 2014
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Summary

I've a 3040 Chinese CNC router. The spindle motor has a plastic part on the top of it. To my understanding it has a role of cooling the motor. the rotor blades in it are completely vertical ones what only helps to gravitational cooling (the warm air moves upwards) and not forcefully cool the motor. My other problem that the motor I have (230W one) has no integrated encoder, so I can't measure the rotational speed.
I designed a replacement of this plastic part with fan blades in it and an encoder ring around it. The encoder ring has exactly 60 holes, what allow to measure the rotational speed with a frequency counter without modification.
Notes:

  1. The part's height is smaller than the original one, because I've no double extrusion 3D printer to print support material.
  2. I haven't printed it yet so I've no idea if it has any design flow.
    Update 07/03/2014:
    • Created a model of the whole thing
    • Tweeked the rotor based on the model
    • Added the opto holder ring

Instructions

Only the two STL file printable. The model is just for demonstration.

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I made one. I did not leave it on, as it produced quite more vibrations than the original part, without a significant increas in Air flow. My Motor only has a small hole for Air outlet..

I built one of these, modifying it slightly to fit my 500W spindle thats 57mm in diameter, also changed the the number of holes for optical sensor to 30. When I tested it it made me realise that there is quite a science to air flow, despite the logical thinking that the blades would "pull" the air up and away from the spindle assuming clockwise rotation. It turns out they do the oposite I assume by creating a vacume under the spinner. Even so I can report that the spindle does indeed run cooler. I am going to try modify the blade design, maybe looking a bit more like the "Dremel Devil"

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