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How to go fixed to variable speed motor - King Canada belt and disc sander

Es posible. Incorporando un variador de velocidad. Lo mismo que utilizas para que un barco corra más o menos, pero sin RC. En realidad es lo que hace 50 años se llamaba un reostato
 
Thanks you,

So a Variac can do the job. But are the one on Amazon around 100$ are good enough to be use in a secur fashion ?

Gracias,

Así que un Variac puede hacer el trabajo. ¿Pero el que está en Amazon alrededor de 100 $ es lo suficientemente bueno como para usarlo de manera segura?
 
Fish&Chip said:
Hi,
There is a way to mods my King Canada belt and disc sander to obtain a variable speed sandeer with it ?

Thanks

Michel
Click to expand...

I have a variable fan speed controller I got on Amazon. It works depending on the motor type. For my spindle sander works perfectly. For my belt/disc sander does a poor job. I have it plugged all the time to my spindle sander.

VIVOSUN Variable Fan Speed Controller, Speed Adjuster for Inline Duct Fan in Ventilation System https://www.amazon.com/dp/B015SLCJ2W/ref=cm_sw_r_apan_i_HND9GDE9RRFFVRGV0XRD?_encoding=UTF8&psc=1

Daniel
Ps: you can buy it. Test it and if does not work then is returnable.
 
Thanks you Daniel. The difficulty for me is to know what type of motor is in the sander which will influence the choice of the variable speed controller.
 
Juan María Riera said:
Es posible. Incorporando un variador de velocidad. Lo mismo que utilizas para que un barco corra más o menos, pero sin RC. En realidad es lo que hace 50 años se llamaba un reostato
Click to expand...
It's possible. Incorporating a speed variator. The same thing you use to make a boat run more or less, but without RC. It's actually what 50 years ago was called a rheostat
 
Hi Fish&Chip,

I am not an electrician but first question is what type of motor are you trying to control and how much control do you want?

Be careful if you are thinking of using a variac these only vary the voltage and you risk burning out the motor if not done correctly, they have been around for a very long time.

Here is a little info from the net, on variac's and there uses.

7) Changing fan speed over a narrow range.
The speed of some types of small AC motors may be varied over a narrow range by changing the applied AC voltage. A problem with this application is that the torque of the motor is also reduced which may result in the fan or motor stalling out. Also note that this technique cannot be used with all electric motors.

Cheers,
Stephen.
 
Take this with a grain of salt because I'm not sure of this info. I tried to do this with my Delta sander/grinder. I have a speed controller for 110 volt stuff but it says to only use on brush type motors. I think that there is at least two types of motor, brush type and induction type. With the brush type you can vary the speed with the voltage and with the induction type you have to vary the frequency. My sander doesn't have brushes so I'm assuming it is an induction motor. I tried my brush type speed controller and if I turned the speed knob right down the motor would not turn. If I slowly turned the speed knob up the motor would start to turn slowly but even if I left the knob alone the motor speed would gradually increase until it reached full speed. It had no power and would slow down as I applied work to it but it was struggling and I'm sure it would have burnt out if I had persisted. I did find some speed controllers for induction motors on the net but I wasn't confident enough to spend the bucks. I think they were kind of pricey. If you figure this out please let us know as I would dearly like to slow down my sander.
Oh. you can make a speed control for brush motors using a common light dimmer switch but varying the frequency is a whole different ball of wax.
 
Fish&Chip said:
Well done DonROTF, it is good informations for me. I will try to know if my motor have brushes or not.

Thank you,

Michel
Click to expand...

That is exactly what the Amazon link I sent you says. The fan speed controller only works with brush type motors. It's on the Amazon tech explanation on what can be used that controller.

As you, and like Don, I didn't know what type of motor has my Belt/disc sander. Because the fan speed controller can be returned, I ordered it. Tested on the sander. It didn't work. I tested it on my spindle sander, and worked. So I kept it.

You can buy one and check if it works. If works you keep the controller (~$24). If it doesn't work, now you know your sander isn't a brush motor type. And you return to Amazon the fan controller. Nothing to lose. Is a win-win situation.

Cheers
Daniel
 
Sorry Daniel, I missed that information on Amazon. Great idea then to make a try. I better understand all the implications with all the reply. The info from your link is usable on Amazon.ca too. Vivosun have also a cheaper version.

Again, thanks.
 
To throw in some more information. For induction motors speed can be controlled by frequency as has already been stated. The device to use for this is a Variable Frequency Drive, or VFD.

Most VFDs are designed for 3 phase motors, our residential power is 1 phase. It was difficult but I did find some 1 phase VFDs but the cost starts at ~$150 US. A drawback is that like controlling a brushed motor by voltage, as the speed drops the power decreases. What this means to us is that the sander will stall easier the slower it is going. Depending on what is being sanded this may or may not be an issue.

I am speaking frome experience. I have a VFD on my old South Bend lathe. When I use the VFD to slow down the speed it typically stalls on all but a very light cut in metal. Works ok for wood though :cool:

Glenn
 
GAStan said:
To throw in some more information. For induction motors speed can be controlled by frequency as has already been stated. The device to use for this is a Variable Frequency Drive, or VFD.

Most VFDs are designed for 3 phase motors, our residential power is 1 phase. It was difficult but I did find some 1 phase VFDs but the cost starts at ~$150 US. A drawback is that like controlling a brushed motor by voltage, as the speed drops the power decreases. What this means to us is that the sander will stall easier the slower it is going. Depending on what is being sanded this may or may not be an issue.

I am speaking frome experience. I have a VFD on my old South Bend lathe. When I use the VFD to slow down the speed it typically stalls on all but a very light cut in metal. Works ok for wood though :cool:

Glenn
Click to expand...
Thank Glenn, I saw thèse costly vfd. So I am in the thinking of maybe puchasing an already variable speed sander.
 
Fish&Chip said:
In fact I hesitate now between Ultimation and Byrnes. But Byrnes have angular positionning in X and Z axes...
Click to expand...
Hi Fish&Chip,
Have you had a look at the big Proxxon disk sander?
Last time I looked the Byrnes didn't have speed control although I am sure it is a better quality than the Proxxon one.

Cheers,
Stephen.
 
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