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Re: Variable speed motors


 

I've posted many times on here about the Consew's.? The CS1000 I use had a photocell and vane that was the foot pedal control.? For this motor, it was easy to just replace it with a pot.
- see my CNC machine here:


- and on my Deckel clone here:


WARNING - it is a hot chassis.? Use a diff probe; see this vid:


What happens if you don't:


The CS1000 requires a bit of circuitry to get it to reverse


Also see Gaston's page for CSM1000 speed control:




And as to Consew changing anything to make it easy for us CNC guys;
I hope I really don't offend anyone with this - reality sucks.

Here's the way I got it from the guys at consew when I talked to them in
several calls about two years ago -

ME: - you should really look at the CNC and small machine shop market -
these are great for spindle motors

Consew: How many you think sell in that market? A few thousand?

ME: Uh....

Consew: Our market easy... we sell to sweat shops in 3rd world country
that make cheap walmart clothes... place burn down we sell more...

ME: Uh....

Consew: Do you know how many sewing machine on one floor of building in
Dhaka?


When it opened in 2009 the Tazreen Fashion factory employed 1,630
workers and produced T-shirts, polo shirts and jackets for various
companies and organizations.[7] These included the US Marines,[8][9]
Dutch company C&A, the American company Walmart and Hong Kong-based
company Li & Fung.[7][10] The factory is part of The Tuba group which is
a major exporter of garments from Bangladesh into the U.S., Germany,
France, Italy and the Netherlands. Its major clients include Walmart,
Carrefour and IKEA.[11]

ME: Uh...


Consew: And they no bitch... motor go, they happy. Not some cranky hobby
guy no like silly little thing...


ME: Uh.... Ok, Thanks... bye.

That's about what I got out of it....

On 2/5/2024 12:50 PM, chrisser via groups.io wrote:
I've read the same thread.

Curious what steps would be needed to be safe. Guessing mounting the pot in a plastic box and using a plastic knob would do a lot. Any special considerations on the wiring other than being sure there's no way for it to short to the chassis?

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-------- Original Message --------
On Feb 5, 2024, 12:42?PM, Mark Kimball wrote:

On Sun, Feb 4, 2024 at 10:55 PM, Johannes wrote:

What is inside of a sewing motor pedal?

Just a resistor or some electronic?
As mentioned by chrisser, they use a hall effect magnetic field sensor and a magnet. It is possible to replace all that with a potentiometer and a couple of resistors but there are a couple of things you need to be aware of. The first is that the sensor-magnet scheme isn't all that linear with respect to distance, so the RPMs vs. pot setting may not be very linear. A tach can address this.

The second is that the motor controller expects a certain amount of current flowing through the sensor chip and goes into an error condition if it doesn't "see" it. This is to detect if the pedal assembly is plugged in or not. IIRC, the hall effect sensor draws something on the order of 4mA.

I found a discussion [here]() that may be helpful. Particularly the comments on the schematic indicating that the control voltage may be "floating" at a rather high voltage. This may be another reason for using a noncontact control device like the hall effect sensor.

Stay safe!

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