Re: [Emc-users] brushless sewing machine motors

[andy pugh]

On 9 July 2018 at 04:36, Ralph Stirling  wrote:
> Anybody ever checked out this type of motor for
> CNC use?

I looked in to them, and used translating some parts of the manual as
an excuse to talk to a very pretty Chinese colleague :-)

They don't have an encoder but they do tend to have some sort of "foot
up" sensor which might be useful for spindle orientation.

-- 
atp
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designed for the especial use of mechanical geniuses, daredevils and
lunatics."
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Re: [Emc-users] brushless sewing machine motors

[andy pugh]

On 9 July 2018 at 10:02, andy pugh  wrote:

> They don't have an encoder but they do tend to have some sort of "foot
> up" sensor which might be useful for spindle orientation.

Needle up. That is.


-- 
atp
"A motorcycle is a bicycle with a pandemonium attachment and is
designed for the especial use of mechanical geniuses, daredevils and
lunatics."
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Re: [Emc-users] brushless sewing machine motors

[Gene Heskett]

On Sunday 08 July 2018 23:36:05 Ralph Stirling wrote:

> Anybody ever checked out this type of motor for
> CNC use?  Seems like a pretty good deal for 400W
> with a drive, at least for a small spindle motor.  I'm
> wondering how easily the drive could be hacked for
> LCNC position control.  There are a lot of different
> motors and power ratings on ebay in this category.
>
> https://ebay.com/itm/253624140119
>
I don't see why not, Ralph. Interfaceing to do the controlling would 
probably be a bit of a headache. And sourceing the schematic for that 
controller might be a problem. Bear in mind they seemed to be designed 
for a 220 volt power source and that many if not all of those 
controllers would require totally isolated control circuitry because the 
control input is on the hot side of the line.  The mesa SpinX1 could 
probably do it if the how can be deduced.

Getting a position encoder output back from it is a mechanical problem 
but thats been worked around quite a few times so thats pretty much up 
to the user to solve. I've even made it work from an encoder on the 
motor as the gearshift is just some hal file work. Works well for rigid 
tapping in either head gear.

I've been considering for years, a rework of the spindle on my micro-mill 
as its only a 200 watt rig, but I still have the brushed 400 watt'er I 
took out of the 7x12 so I have no present need for a bigger motor.

> -- Ralph
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Re: [Emc-users] OT: Wire feeder on screw forging machine

[Leonardo Marsaglia]

Thank you guys for the replies.

The simplest mechanism that I've seen so far is the one used in the nail
making machines but they don't use a stop for setting the lenght. I'll try
to design both alternatives and see wich one suits me the better.

2018-07-02 22:12 GMT-03:00 Dave Cole :

> Oftentimes I have seen just a couple of grooved pinch rolls used - aka
> like a mig welder wire feeder.   It really depends on how much drive force
> you need.  If you pinch the wire too hard it will deform and extend.   So
> for more drive force, use more drive rollers.You can use gears to drive
> the rollers, but I think chains are sometimes used as well.
>
> There are a lot of wire processing facilities around me and a lot of bolt
> plants.
>
> Dave
>
>
> On 7/2/2018 1:57 PM, Ralph Stirling wrote:
>
>> Check out "wire straightening machines" on youtube.  You'll
>> see a bunch of machines with pretty similar wire feeding
>> methods.  Some of those may give you more ideas than
>> what you see on the screw heading machine.
>>
>> -- Ralph
>> 
>> From: Leonardo Marsaglia [ldmarsag...@gmail.com]
>> Sent: Monday, July 2, 2018 9:41 AM
>> To: Enhanced Machine Controller (EMC)
>> Subject: [Emc-users] OT: Wire feeder on screw forging machine
>>
>> Hello to all.
>>
>> I'm trying to figure out how to design the simplest possible wire feeder
>> like the one on this video: https://youtu.be/_pjbwFM1LM4?t=28s
>>
>> As you can see the wire comes to a stop (a simple bolt with a nut) so I
>> suppose the feeding mechanism has some sort of slipping capability once
>> the
>> wire has reached the stop.
>>
>> Is there any common and simple mechanism for this purpose? I've never
>> really worked with machines like this so I'm curious about what the
>> simplest solution could be. I can imagine several ways to do it but I
>> don't
>> want to re invent the wheel.
>>
>> Thanks as always!
>>
>> Leonardo.
>> 
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>
> 
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[Emc-users] So, how's Ethernet?

[Sven Wesley]

Dear Friends,

Been away from the EMC arena for a while, but my machines are running as
usual. Now I have to take care of that Körner engraver I was talking about
more than a year ago. I've decided that the easiest way to make this happen
is to rip out the old controller and make new stuff.

So, my drug dealer cncdrive.com has a few breakout boards based on
Ethernet. There are some videos on LCNC hardware on Mesa Ethernet and such,
but it seems there is very little documentation.  These two breakout boards
would be really nice to get up and running, don't you think?

http://cncdrive.com/UC400ETH.html
http://cncdrive.com/UC300ETH.html

Or should I go with the old school LPT port solution?

Yeah, and before you reply with all those real time arguments, I'm too old
in this game so I've read 'em all. ;)

All the best,
Sven
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Re: [Emc-users] brushless sewing machine motors

[Dave Cole]

I have some industrial sewing machines.

Some of the cheap brushless motors have a reputation for poor low speed 
torque.


However some of the higher end brushless motors are apparently ok.

Check out the motors available from Sailrite.com.

If you do some digging you will realize that Consew (a sewing machine 
company) sells the same motor.

I think these better brushless motors start at about $200 each.

Most are made in China or Taiwan.

There are some brushed DC motors out there that are preferable for some 
low speed sewing machine applications.

The guys who sew leather at very slow speeds like them.

I sew canvas covers and sails once in a while, and I needed a new motor. 
  I bought one of the recommended brushed DC motors and it works, 
however I increased the belt reduction to the sewing machine head to 
further the low speed control.


I think I got it for $110 off Ebay including free shipping.   It was 
suppose to have a standard 7/8" keyed spindle (AMCO standard spindle), 
but it is not.

Its a smaller metric shaft.

Dave



On 7/8/2018 11:36 PM, Ralph Stirling wrote:

Anybody ever checked out this type of motor for
CNC use?  Seems like a pretty good deal for 400W
with a drive, at least for a small spindle motor.  I'm
wondering how easily the drive could be hacked for
LCNC position control.  There are a lot of different
motors and power ratings on ebay in this category.

https://ebay.com/itm/253624140119

-- Ralph
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Re: [Emc-users] brushless sewing machine motors

[John Bald]

That particular ad says "US Stock", but looks like it's 220v 50hz which won't 
work in the US 

On Monday, July 9, 2018 12:09 AM, Ralph Stirling 
 wrote:
 

 Anybody ever checked out this type of motor for
CNC use?  Seems like a pretty good deal for 400W
with a drive, at least for a small spindle motor.  I'm
wondering how easily the drive could be hacked for
LCNC position control.  There are a lot of different
motors and power ratings on ebay in this category.

https://ebay.com/itm/253624140119

-- Ralph
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Re: [Emc-users] brushless sewing machine motors

[Ralph Stirling]

Sure enough!  I had been looking at a mix of 110 and 220v
motor/drives.  Now that you pointed that out, it looks like
none of the 400W under-$100 motors are 110.  There are
550W (3/4HP) motors for $120, and 750W (1HP) for $150.

Hmmm.

-- Ralph

From: John Bald [robotwiz...@att.net]
Sent: Monday, July 9, 2018 10:55 AM
To: Enhanced Machine Controller (EMC)
Subject: Re: [Emc-users] brushless sewing machine motors

That particular ad says "US Stock", but looks like it's 220v 50hz which won't 
work in the US

On Monday, July 9, 2018 12:09 AM, Ralph Stirling 
 wrote:


 Anybody ever checked out this type of motor for
CNC use?  Seems like a pretty good deal for 400W
with a drive, at least for a small spindle motor.  I'm
wondering how easily the drive could be hacked for
LCNC position control.  There are a lot of different
motors and power ratings on ebay in this category.

https://ebay.com/itm/253624140119

-- Ralph
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Re: [Emc-users] So, how's Ethernet?

[andy pugh]

On 9 July 2018 at 16:56, Sven Wesley  wrote:

> http://cncdrive.com/UC400ETH.html
> http://cncdrive.com/UC300ETH.html
>
> Or should I go with the old school LPT port solution?

How about this? It's cheaper and LinuxCNC-supported:
http://eusurplus.com/index.php?route=product/product&product_id=614&search=7i92&description=true&sub_category=true



-- 
atp
"A motorcycle is a bicycle with a pandemonium attachment and is
designed for the especial use of mechanical geniuses, daredevils and
lunatics."
— George Fitch, Atlanta Constitution Newspaper, 1916

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