Posted by:
roger wilson
(---.hsd1.mn.comcast.net)
Mike,
A couple of pictures of power units made from sewing machine motors from a few years ago:
[
www.rodbuilding.org]
[
www.rodbuilding.org]
In both of these builds I used a jack shaft to do a double reduction on the motor. When I built these units, I drilled out tight fitting holes for bearings in the power unit for a shaft. Then, I put different sized pulleys and belts on the shaft, motor, and output shaft to achieve the speed reduction that I wanted.
Consider the fact that the motor has a full speed operating speed of 5,000 rpm.
To apply finish you really don't want to be turning faster than 50 rpm or so.
So, you really need to have a 100:1 reduction ratio on your power head. You can accomplish this by using a pair of 10:1 reductions.
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But in today's world, inexpensive DC gear motors are available. These motors can be obtained with virtually any final speed that you desire. Then, if you wish, you can drive the finishing chuck directly from the motor.
For example:
Here is a 12 volt DC 50 rpm motor:
[
www.amazon.com]
You can vary the speed of the motor by hooking up a speed controller in between the power supply and motor, or you can use a 0-12 volt variable dc voltage supply to also vary the speed from 0-50 rpm.
These motors are small. About 1 1/2 inches in diameter and 2-3 inches long. Many of these small motors use 6mm shafts.
An inexpensive speed controller. Feed 12 volt DC into the speed controller and hook up your motor. The knob will allow you to vary your speed from 0 to the maximum speed of the motor.
[
www.amazon.com]
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With the advent of these small gear motors, I no longer use any of the universal style AC sewing machine motors or similar.
Be safe
Edited 2 time(s). Last edit at 04/26/2016 04:37PM by roger wilson.
