Re: [Emc-users] Help requested - stepper drivers.

[Claude Froidevaux]

Le 09.07.2014 23:09, Przemek Klosowski a écrit :
> On Wed, Jul 9, 2014 at 12:23 PM, Claude Froidevaux 
> wrote:
>
>> to get en estimate of needed voltage:
>>
>> get the speed you need in rad/s  (1t/s --> 6.28 rad/s)
>> multiply by the torque in Nm
>>
>> this will give you the output power of motor at max speed.
>>
>> then, as you know the current inside the motor, you can deduce minimal
>> needed voltage to get the same power (plus additional waste)
>>
>> for example:
>>
>> stepper:
>> 4Nm, 4.2A
>>
>> need 1000rpm (5 m/min with 5mm leadscrew)
>>
>> power @ max speed and max torque: 1000/60*2*pi * 4 = 104 W
>>
>> P = U *I --> 104 / 4.2 = 25 --> we need at least 25V, but this is
>> without taking any loss in accout (resistance, drive, sinus factor,
>> ...). Doubling this value will get you something that shall do the
>> tricks! (so 50V needed at least)
>>
>> this is a really rough calculation, but it help a lot to know what is
>> needed.
>>
> Sorry if I am making a simple mistake (I plead lack of sleep today) but
> isn't 4 * 2 pi 1000/60 equal to 419? More importantly, as you indicate that
> formula is flawed,  because usually the max torque requirement is usually
> at low speeds, when you accelerate the axis. Of course the stepper motors
> lose torque at max speed, so the above formula is just a ballpark estimate;
> true V estimate should take into account  the motor's Back-EMF (kV) 
> characteristics, I believe.
>

You are right, I missed my calculation (sorry).

Be careful that acceleration is usually the same up to top speed 
(standard trapezoidal or jerked move), but often you can accept less 
torque at high speed than low speed (assuming not everything is used 
only for acceleration).

Of course the right way is through back-EMF, but stepper motor almost 
never give this value (you can know it with a drill machine an some 
equipment, but this assume you already own the steppers). This tricks 
give the ability to coarse estimate what you can get, or what you do 
need. What is really important is that you still get some current at max 
speed (lets assume 1A only, if voltage is not enough, you will reach 
state that current go to zero, and motor stall. (you can also simply 
measure current on delivered by power supply, it shall still provide 
substantial current (let say at least 25% of rest current) when reaching 
maximum speed.



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Re: [Emc-users] Help requested - stepper drivers.

[Przemek Klosowski]

On Wed, Jul 9, 2014 at 12:23 PM, Claude Froidevaux 
wrote:

>
> to get en estimate of needed voltage:
>
> get the speed you need in rad/s  (1t/s --> 6.28 rad/s)
> multiply by the torque in Nm
>
> this will give you the output power of motor at max speed.
>
> then, as you know the current inside the motor, you can deduce minimal
> needed voltage to get the same power (plus additional waste)
>
> for example:
>
> stepper:
> 4Nm, 4.2A
>
> need 1000rpm (5 m/min with 5mm leadscrew)
>
> power @ max speed and max torque: 1000/60*2*pi * 4 = 104 W
>
> P = U *I --> 104 / 4.2 = 25 --> we need at least 25V, but this is
> without taking any loss in accout (resistance, drive, sinus factor,
> ...). Doubling this value will get you something that shall do the
> tricks! (so 50V needed at least)
>
> this is a really rough calculation, but it help a lot to know what is
> needed.
>

Sorry if I am making a simple mistake (I plead lack of sleep today) but
isn't 4 * 2 pi 1000/60 equal to 419? More importantly, as you indicate that
formula is flawed,  because usually the max torque requirement is usually
at low speeds, when you accelerate the axis. Of course the stepper motors
lose torque at max speed, so the above formula is just a ballpark estimate;
true V estimate should take into account  the motor's Back-EMF (kV)
characteristics, I believe.
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Re: [Emc-users] Help requested - stepper drivers.

[Claude Froidevaux]

could be these one:

http://www.motionking.com/Products/Hybrid_Stepper_Motors/2-phase/24H2A_Stepper_Motor_60mm_1.8degree.htm

up to 3.3Nm

or from ebay:

http://www.ebay.fr/itm/NEMA-24-Stepper-Motor-Schrittmotor-GB24H2100-42-4A-Single-Shaft-4Nm-CNC-/181439601418?pt=Motoren_Getriebe&hash=item2a3ea49b0a

I have a setup with 3 of these (4Nm model), with 72V power supply (2x 
300W 36V cheap ebay in serie), and DM856 servo amplifier, work like a charm.

it exist as well with 1/4 axis, but I really prefer 8mm shaft diameter 
(metric system).

to get en estimate of needed voltage:

get the speed you need in rad/s  (1t/s --> 6.28 rad/s)
multiply by the torque in Nm

this will give you the output power of motor at max speed.

then, as you know the current inside the motor, you can deduce minimal 
needed voltage to get the same power (plus additional waste)

for example:

stepper:
4Nm, 4.2A

need 1000rpm (5 m/min with 5mm leadscrew)

power @ max speed and max torque: 1000/60*2*pi * 4 = 104 W

P = U *I --> 104 / 4.2 = 25 --> we need at least 25V, but this is 
without taking any loss in accout (resistance, drive, sinus factor, 
...). Doubling this value will get you something that shall do the 
tricks! (so 50V needed at least)

this is a really rough calculation, but it help a lot to know what is 
needed.

Claude








Le 05.07.2014 19:08, Gene Heskett a écrit :
> On Saturday 05 July 2014 12:06:33 Claude Froidevaux did opine
> And Gene did reply:
>> Hi,
>>
>> leadshine is a china brand of good quality stepper driver
>> (automationlogic seem to be leadshine model DM856 for example, there is
>> a lot of re-branding within leadshine drives)
>>
>> I like the digital version (DM series, you can tune out some resonance,
>> work well). I don't know much about the standard serie (M series)
> Responds well to the alternating stack of rubber and fender washers,
> stacked about 2" long on the rear shaft.
>   
>> BTW, nema24 motor is a quite interesting for the size / torque they
>> propose.
>>
>> Claude
> Those I have not seen, link please?
>
> Thanks Claude
>
> Cheers, Gene Heskett

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Re: [Emc-users] Help requested - stepper drivers.

[Steve Blackmore]

On Sat, 5 Jul 2014 09:33:37 -0700, you wrote:

>I don't know about the newer digital drives from Automation Technologies but I 
>have my gantry router set up with these: 
>http://www.automationtechnologiesinc.com/products-page/stepper-nema23-3-axis-kits/cnc-stepper-motor-3-axis-kit-2.
>They have performed flawlessly for nearly 5 years driving 2 TPI screws on my 
>router, sometimes running for 8 hrs in +90 F conditions. 
>
>I have been curious about the closed loop systems A-T offers but haven't found 
>any feedback from users yet: 
>http://www.automationtechnologiesinc.com/products-page/nema23-closed-loop-stepper-motor-system-hybrid-servo-kit/nema23-282-oz-in-closed-loop-stepper-motors-3-axis-cnc-kit-110vac220vac-2
>Does anyone have any experience with these?

Not that particular motor or drive  - I'm using a couple of the
Leadshine ones on the router, ES-M22430 Nema 24 motors (425 oz/in) and
ES-D1008 drivers at 72VDC (Max 70VA/C or 100VDC) 

Ones above look like the Leadshine D508 drives with the M32320 motors -
Max 50VDC and 232 oz/in motors.

I got one to test - replaced the X axis drive system - so impressed I
BOUGHT two more! 

None of Leadshine's specifications or claims are exaggerated.
Acceleration is fantastic, no lost steps with much higher feed rates
too. Settle time is very quick with no dithering like the crap Gecko 320
servo system I tried and scrapped. They are so easy to tune if required
but they seem to work perfectly for me out of the box.

All the details are on http://www.leadshine.com/ under easy servo
products. 

Still got Z axis to do, but I need a new drive enclosure as the drives
are physically much bigger than the old ones they replaced and it needed
tidying up anyway. Got the new enclosure and started but router work
keeps getting in the way. 

Steve Blackmore
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Re: [Emc-users] Help requested - stepper drivers.

[Gene Heskett]

On Saturday 05 July 2014 22:36:42 John Alexander Stewart did opine
And Gene did reply:
> Hi Gene;
> 
> No, my little Unimat is really just for show. I take it to exhibitions,
> and it moves around, but does not cut anything.
> 
> I *could* take some of my spare parts and make it thread, but to be
> honest, it's one of the first ones, with a motor that is barely
> powerful enough to turn the spindle, so I don't think it'll be worth
> setting up to thread.
> 
> I have turned some parts from Bronze on it, and it worked actually
> quite well, but that's about it. I could have turned these parts on my
> first CNC mill about 10x faster!
> 
> (It's one of the first ones off the line - a cast iron "Mark1" model,
> and has right handed feed screws, so was useless for manual machining,
> as everything went the wrong way compared to my other equipment)
> 
Humm, I think I borrowed one of those 45 years back, made a spindle nose 
plug that ran true in a .303 case neck, and trimmed about 3 thou off the 
outside of the neck so I could use mill 30-06 cases in a 303 barrel 
someone had rechambered for 30-06, and which I had rechambered for the 
P.O.Ackley version.  Once I got the right sized bullet for that barrel it 
did nickel sized groups for the next 4000 rounds.

> Now, I'd like to see Cecil's little watchmakers lathe do the 00-80
> screws!
> 
> JohnS.

That would indeed be a treat.  I haven't tried that size on my 7x12, 
yet...   6-48's worked though. :)

While I do use that 0-80 size frequently, I do it with commercial screws, 
taps and dies.  However I have made quite a few 1/4-28 threads using G76.  
For #209M nipples for one of my BP rifles.  Non-vented for use with 
Blackhorn 209 powder, which takes a tactical nuke to ignite it.  Its very 
accurate stuff, IF you can get it lit. A #11 cap won't, and a vented 209 
nipple won't, it takes the full power of a 209M shotgun primer in an 
unvented nipple to do it.  Also quite expensive at $4 an oz in 10 oz 
containers.

Cheers, Gene Heskett
-- 
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 soap, ballot, jury, and ammo. Please use in that order."
-Ed Howdershelt (Author)
Genes Web page 
US V Castleman, SCOTUS, Mar 2014 is grounds for Impeaching SCOTUS

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Re: [Emc-users] Help requested - stepper drivers.

[Cecil Thomas]

John,
If I can get the shop straightened up a bit in 
the next couple of days I will try to show a 
00-90 being cut on the Derbyshire(tiny), the Griz 
9x20 (middle size), and the Monarch 10EE (just right).
Most people are more impressed with the 10EE 
making the tiny screw than they are with the 
smaller lathes.  I guess it just looks out of scale.
By the way, I can make a 000-120 (.034 dia) but I 
don't have a nut to test it with.  I guess I 
could make a 000-120 tap and make a nut but that 
wouldn't prove that it is actually to spec.  I 
thought about boring the thread but my attempts 
at making a boring bar with a .010 shank were pretty much a failure.
I searched for a place to buy a few 00-120 nuts 
but the places that sell them like to move them 
in very large lots.  Pretty cheap by the piece 
but what am I going to do with the other 999.

Cecil

Saturday 7-5-3014  JohnS said
 > Now, I'd like to see Cecil's little 
watchmakers lathe do the 00-80 screws… JohnS.


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Re: [Emc-users] Help requested - stepper drivers.

[Gregg Eshelman]

On 7/5/2014 3:14 PM, Marcus Bowman wrote:

> Not necessarily. I'm using 600NM NEMA 34 triple stack steppers, with Gecko 
> 201s running at 78volts. PSU is based on two toroidal transformers, giving up 
> to 10A at 80v for up to 4 steppers. Over current and over voltage protection, 
> with soft start - overkill really.
> That size of stepper can each provide the equivalent of 1/4 horsepower, if my 
> rough calculations are correct.
> That should be enough for a mill up to the size of a Bridgeport.
> I just don't believe in trying to trim the size or power of a stepper to save 
> a few pounds/dollars. I'd rather over-spec slightly in the knowledge that I 
> have power in hand.

I'm using 1600 oz/in steppers in place of 120 volt brush type DC servo 
motors. The steppers are about 1/3 the size of the servos yet have more 
torque at the same RPM the servos achieved their peak torque.


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Re: [Emc-users] Help requested - stepper drivers.

[John Alexander Stewart]

Hi Gene;

No, my little Unimat is really just for show. I take it to exhibitions, and
it moves around, but does not cut anything.

I *could* take some of my spare parts and make it thread, but to be honest,
it's one of the first ones, with a motor that is barely powerful enough to
turn the spindle, so I don't think it'll be worth setting up to thread.

I have turned some parts from Bronze on it, and it worked actually quite
well, but that's about it. I could have turned these parts on my first CNC
mill about 10x faster!

(It's one of the first ones off the line - a cast iron "Mark1" model, and
has right handed feed screws, so was useless for manual machining, as
everything went the wrong way compared to my other equipment)

Now, I'd like to see Cecil's little watchmakers lathe do the 00-80 screws…

JohnS.




On Sat, Jul 5, 2014 at 7:44 PM, Gene Heskett  wrote:

> On Saturday 05 July 2014 19:08:34 John Alexander Stewart did opine
> And Gene did reply:
> > Andy, Marcus, Claude, Gene;
> >
> > Thanks for the feedback and the link.
> >
> > I logged back on to say that I had purchased some of those DM856
> > controllers, enough for my 4 axis mill build, plus one spare, just in
> > case.
> >
> > I do have a larger lathe that I'm trying to get myself to CNC - an Emco
> > Compact-8, and those hybrid drives seem really interesting… My little
> > Unimat SL- CNC job might have to be put out to pasture when all is
> > completed.
> >
> > Thanks all;  JohnS.
>
> I am glad you found the info useful John.
>
> Question, did you have the unimat equipt with a spindle encoder so it is
> capable of going a G33.1 rigid tap operation? Or a g76 threading
> operation?  Both of those are handier than sliced bread.
>
> My hal file is a monster, but I have a 7x12 doing that now, in a peck loop
> with a wrapper script I've written, in GCode of course.  I mount the tap
> in a chuck on the tool post.
>
> Cheers, Gene Heskett
> --
> "There are four boxes to be used in defense of liberty:
>  soap, ballot, jury, and ammo. Please use in that order."
> -Ed Howdershelt (Author)
> Genes Web page 
> US V Castleman, SCOTUS, Mar 2014 is grounds for Impeaching SCOTUS
>
>
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Re: [Emc-users] Help requested - stepper drivers.

[Gene Heskett]

On Saturday 05 July 2014 19:08:34 John Alexander Stewart did opine
And Gene did reply:
> Andy, Marcus, Claude, Gene;
> 
> Thanks for the feedback and the link.
> 
> I logged back on to say that I had purchased some of those DM856
> controllers, enough for my 4 axis mill build, plus one spare, just in
> case.
> 
> I do have a larger lathe that I'm trying to get myself to CNC - an Emco
> Compact-8, and those hybrid drives seem really interesting… My little
> Unimat SL- CNC job might have to be put out to pasture when all is
> completed.
> 
> Thanks all;  JohnS.

I am glad you found the info useful John.

Question, did you have the unimat equipt with a spindle encoder so it is 
capable of going a G33.1 rigid tap operation? Or a g76 threading 
operation?  Both of those are handier than sliced bread.

My hal file is a monster, but I have a 7x12 doing that now, in a peck loop 
with a wrapper script I've written, in GCode of course.  I mount the tap 
in a chuck on the tool post.

Cheers, Gene Heskett
-- 
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 soap, ballot, jury, and ammo. Please use in that order."
-Ed Howdershelt (Author)
Genes Web page 
US V Castleman, SCOTUS, Mar 2014 is grounds for Impeaching SCOTUS

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Re: [Emc-users] Help requested - stepper drivers.

[John Alexander Stewart]

Andy, Marcus, Claude, Gene;

Thanks for the feedback and the link.

I logged back on to say that I had purchased some of those DM856
controllers, enough for my 4 axis mill build, plus one spare, just in case.

I do have a larger lathe that I'm trying to get myself to CNC - an Emco
Compact-8, and those hybrid drives seem really interesting… My little
Unimat SL- CNC job might have to be put out to pasture when all is
completed.

Thanks all;  JohnS.
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Re: [Emc-users] Help requested - stepper drivers.

[Marcus Bowman]

On 5 Jul 2014, at 22:25, andy pugh wrote:

> On 5 July 2014 22:14, Marcus Bowman  
> wrote:
>> I just don't believe in trying to trim the size or power of a stepper to 
>> save a few pounds/dollars. I'd rather over-spec slightly in the knowledge 
>> that I have power in hand.
> 
> It isn't necessarily that simple, though.
> It seems that the smaller steppers typically spin faster. On my
> mill/lathe the shortest, weakest stepper is actually the one that
> stalls least frequently. It is the X of the lathe, and that does
> generally need less force than the Z, though.
> 
> Once you bring gear ratios into the system you can end up with a small
> stepper running at high rpm being more suitable than a larger,
> higher-torque but lower-speed/higher inductance one.
> 
> However, if I was building a stepper machine I think I would be
> looking carefully at the  hybrid systems:
> 
> http://www.ebay.co.uk/itm/301181761480
> 
Great link - thanks.
I see the Step & Direction lines. What about the Pend+, Pend1, ALM+ an ALM- 
lines? Can LinuxCNC handle those using an established method? I have no 
experience of hooking up servos, so I don't know if this hybrid setup 
interfaces in the same way. What handles the errors - the hybrid Step-servo 
interface, or LinuxCNC?

Marcus
 
> -- 
> atp
> If you can't fix it, you don't own it.
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Re: [Emc-users] Help requested - stepper drivers.

[andy pugh]

On 5 July 2014 22:14, Marcus Bowman  wrote:
> I just don't believe in trying to trim the size or power of a stepper to save 
> a few pounds/dollars. I'd rather over-spec slightly in the knowledge that I 
> have power in hand.

It isn't necessarily that simple, though.
It seems that the smaller steppers typically spin faster. On my
mill/lathe the shortest, weakest stepper is actually the one that
stalls least frequently. It is the X of the lathe, and that does
generally need less force than the Z, though.

Once you bring gear ratios into the system you can end up with a small
stepper running at high rpm being more suitable than a larger,
higher-torque but lower-speed/higher inductance one.

However, if I was building a stepper machine I think I would be
looking carefully at the  hybrid systems:

http://www.ebay.co.uk/itm/301181761480

-- 
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If you can't fix it, you don't own it.
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Re: [Emc-users] Help requested - stepper drivers.

[Marcus Bowman]

On 5 Jul 2014, at 13:54, John Alexander Stewart wrote:

> Hi all; Hope this question is considered on-topic, or at least not too far
> off.
> 
> I'm doing another CNC conversion - my largest yet. G0704 (BF20) style mill,
> and I'm wondering about stepper drivers. (Have a Mesa 5i25/7i76 combo;
> maybe my next machine will be servo)
> 
> I'm wondering about drivers - I have as spares a Gecko G540, some 48v 7.5a
> switching power supplies, a couple Gecko 3.5A drivers (the ones in the
> G540, but standalone) but wondering:
> 
> 1) digital drivers, eg automationtechnologiesinc.com ones, are they worth
> the price?
> 
> 2) China drivers look the same as 1); presumably the technology is the
> same, just name-badging;
> 
> 3) Europeans seem to use smaller steppers than North Americans; is there
> much savings (e.g., power, heat) from using smaller steppers? I'd guess so.
> 
Not necessarily. I'm using 600NM NEMA 34 triple stack steppers, with Gecko 201s 
running at 78volts. PSU is based on two toroidal transformers, giving up to 10A 
at 80v for up to 4 steppers. Over current and over voltage protection, with 
soft start - overkill really.  
That size of stepper can each provide the equivalent of 1/4 horsepower, if my 
rough calculations are correct.
That should be enough for a mill up to the size of a Bridgeport.
I just don't believe in trying to trim the size or power of a stepper to save a 
few pounds/dollars. I'd rather over-spec slightly in the knowledge that I have 
power in hand. 

Marcus

> I'm in Canada, so shipping from the USA or China or Europe is about the
> same - expensive - so source location is not an issue.
> 
> It does seem a shame to purchase new drivers and power supplies, but I
> might as well do this machine "right".
> 
> Thanks for any insights you might give.
> 
> John A. Stewart.
> --
> Open source business process management suite built on Java and Eclipse
> Turn processes into business applications with Bonita BPM Community Edition
> Quickly connect people, data, and systems into organized workflows
> Winner of BOSSIE, CODIE, OW2 and Gartner awards
> http://p.sf.net/sfu/Bonitasoft
> ___
> Emc-users mailing list
> Emc-users@lists.sourceforge.net
> https://lists.sourceforge.net/lists/listinfo/emc-users


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Turn processes into business applications with Bonita BPM Community Edition
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Re: [Emc-users] Help requested - stepper drivers.

[Gene Heskett]

On Saturday 05 July 2014 12:06:33 Claude Froidevaux did opine
And Gene did reply:
> Hi,
> 
> leadshine is a china brand of good quality stepper driver
> (automationlogic seem to be leadshine model DM856 for example, there is
> a lot of re-branding within leadshine drives)
> 
> I like the digital version (DM series, you can tune out some resonance,
> work well). I don't know much about the standard serie (M series)

Responds well to the alternating stack of rubber and fender washers, 
stacked about 2" long on the rear shaft.
 
> BTW, nema24 motor is a quite interesting for the size / torque they
> propose.
> 
> Claude

Those I have not seen, link please?

Thanks Claude

Cheers, Gene Heskett
-- 
"There are four boxes to be used in defense of liberty:
 soap, ballot, jury, and ammo. Please use in that order."
-Ed Howdershelt (Author)
Genes Web page 
US V Castleman, SCOTUS, Mar 2014 is grounds for Impeaching SCOTUS

--
Open source business process management suite built on Java and Eclipse
Turn processes into business applications with Bonita BPM Community Edition
Quickly connect people, data, and systems into organized workflows
Winner of BOSSIE, CODIE, OW2 and Gartner awards
http://p.sf.net/sfu/Bonitasoft
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Re: [Emc-users] Help requested - stepper drivers.

[Greg Bernard]

I don't know about the newer digital drives from Automation Technologies but I 
have my gantry router set up with these: 
http://www.automationtechnologiesinc.com/products-page/stepper-nema23-3-axis-kits/cnc-stepper-motor-3-axis-kit-2.
They have performed flawlessly for nearly 5 years driving 2 TPI screws on my 
router, sometimes running for 8 hrs in +90 F conditions. 

I have been curious about the closed loop systems A-T offers but haven't found 
any feedback from users yet: 
http://www.automationtechnologiesinc.com/products-page/nema23-closed-loop-stepper-motor-system-hybrid-servo-kit/nema23-282-oz-in-closed-loop-stepper-motors-3-axis-cnc-kit-110vac220vac-2
Does anyone have any experience with these?

 
 
+++
"Anyone who believes exponential growth can go on forever in a finite world is 
either a madman or an economist."
        -Kenneth Boulding, economist
“How unfortunate that the Earth’s first intelligent social animal is a tribal 
carnivore” 
    -E.O. Wilson, sociobiologist



>
> From: John Alexander Stewart 
>To: Enhanced Machine Controller (EMC)  
>Sent: Saturday, July 5, 2014 7:54 AM
>Subject: [Emc-users] Help requested - stepper drivers.
> 
>
>Hi all; Hope this question is considered on-topic, or at least not too far
>off.
>
>I'm doing another CNC conversion - my largest yet. G0704 (BF20) style mill,
>and I'm wondering about stepper drivers. (Have a Mesa 5i25/7i76 combo;
>maybe my next machine will be servo)
>
>I'm wondering about drivers - I have as spares a Gecko G540, some 48v 7.5a
>switching power supplies, a couple Gecko 3.5A drivers (the ones in the
>G540, but standalone) but wondering:
>
>1) digital drivers, eg automationtechnologiesinc.com ones, are they worth
>the price?
>
>2) China drivers look the same as 1); presumably the technology is the
>same, just name-badging;
>
>3) Europeans seem to use smaller steppers than North Americans; is there
>much savings (e.g., power, heat) from using smaller steppers? I'd guess so.
>
>I'm in Canada, so shipping from the USA or China or Europe is about the
>same - expensive - so source location is not an issue.
>
>It does seem a shame to purchase new drivers and power supplies, but I
>might as well do this machine "right".
>
>Thanks for any insights you might give.
>
>John A. Stewart.
>--
>Open source business process management suite built on Java and Eclipse
>Turn processes into business applications with Bonita BPM Community Edition
>Quickly connect people, data, and systems into organized workflows
>Winner of BOSSIE, CODIE, OW2 and Gartner awards
>http://p.sf.net/sfu/Bonitasoft
>___
>Emc-users mailing list
>Emc-users@lists.sourceforge.net
>https://lists.sourceforge.net/lists/listinfo/emc-users
>
>
>
--
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Turn processes into business applications with Bonita BPM Community Edition
Quickly connect people, data, and systems into organized workflows
Winner of BOSSIE, CODIE, OW2 and Gartner awards
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Re: [Emc-users] Help requested - stepper drivers.

[Claude Froidevaux]

Hi,

leadshine is a china brand of good quality stepper driver 
(automationlogic seem to be leadshine model DM856 for example, there is 
a lot of re-branding within leadshine drives)

I like the digital version (DM series, you can tune out some resonance, 
work well). I don't know much about the standard serie (M series)

BTW, nema24 motor is a quite interesting for the size / torque they 
propose.

Claude


Le 05.07.2014 14:54, John Alexander Stewart a écrit :
> Hi all; Hope this question is considered on-topic, or at least not too far
> off.
>
> I'm doing another CNC conversion - my largest yet. G0704 (BF20) style mill,
> and I'm wondering about stepper drivers. (Have a Mesa 5i25/7i76 combo;
> maybe my next machine will be servo)
>
> I'm wondering about drivers - I have as spares a Gecko G540, some 48v 7.5a
> switching power supplies, a couple Gecko 3.5A drivers (the ones in the
> G540, but standalone) but wondering:
>
> 1) digital drivers, eg automationtechnologiesinc.com ones, are they worth
> the price?
>
> 2) China drivers look the same as 1); presumably the technology is the
> same, just name-badging;
>
> 3) Europeans seem to use smaller steppers than North Americans; is there
> much savings (e.g., power, heat) from using smaller steppers? I'd guess so.
>
> I'm in Canada, so shipping from the USA or China or Europe is about the
> same - expensive - so source location is not an issue.
>
> It does seem a shame to purchase new drivers and power supplies, but I
> might as well do this machine "right".
>
> Thanks for any insights you might give.
>
> John A. Stewart.
> --
> Open source business process management suite built on Java and Eclipse
> Turn processes into business applications with Bonita BPM Community Edition
> Quickly connect people, data, and systems into organized workflows
> Winner of BOSSIE, CODIE, OW2 and Gartner awards
> http://p.sf.net/sfu/Bonitasoft
> ___
> Emc-users mailing list
> Emc-users@lists.sourceforge.net
> https://lists.sourceforge.net/lists/listinfo/emc-users

--
Open source business process management suite built on Java and Eclipse
Turn processes into business applications with Bonita BPM Community Edition
Quickly connect people, data, and systems into organized workflows
Winner of BOSSIE, CODIE, OW2 and Gartner awards
http://p.sf.net/sfu/Bonitasoft
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Re: [Emc-users] Help requested - stepper drivers.

[Gene Heskett]

On Saturday 05 July 2014 08:54:14 John Alexander Stewart did opine
And Gene did reply:
> Hi all; Hope this question is considered on-topic, or at least not too
> far off.
> 
> I'm doing another CNC conversion - my largest yet. G0704 (BF20) style
> mill, and I'm wondering about stepper drivers. (Have a Mesa 5i25/7i76
> combo; maybe my next machine will be servo)
> 
> I'm wondering about drivers - I have as spares a Gecko G540, some 48v
> 7.5a switching power supplies, a couple Gecko 3.5A drivers (the ones
> in the G540, but standalone) but wondering:
> 
> 1) digital drivers, eg automationtechnologiesinc.com ones, are they
> worth the price?
> 
> 2) China drivers look the same as 1); presumably the technology is the
> same, just name-badging;
> 
> 3) Europeans seem to use smaller steppers than North Americans; is
> there much savings (e.g., power, heat) from using smaller steppers?
> I'd guess so.
> 
> I'm in Canada, so shipping from the USA or China or Europe is about the
> same - expensive - so source location is not an issue.
> 
> It does seem a shame to purchase new drivers and power supplies, but I
> might as well do this machine "right".
> 
> Thanks for any insights you might give.
> 
> John A. Stewart.

John, I am currently using 6 of the 2M542 Chinese drivers, 50 volt rated, 
4.2 amps.  They also make a larger 80 volt, more amps version. The 2M542's 
can be had at around a $50 bill each on fleabay, and they have now 
outlasted their money in other units burned up.  I bought 7 at the time so 
I'd have a spare, 3 years later the 7nth is still in the box in the drawer 
beside the lathe.  Running both double stack (262 oz) and triple stack 
(425 oz) Nema 23's with them.

My supplies aren't really at the 50 volt limit, one at 28, one at around 
38. I even accidentally crow barred one, it tripped off, needed a power 
down reset, but no damage.  Not recommended below 24 volts as that raises 
the operating temperature. Good drivers IMO.

My $0.02. :)

Cheers, Gene Heskett
-- 
"There are four boxes to be used in defense of liberty:
 soap, ballot, jury, and ammo. Please use in that order."
-Ed Howdershelt (Author)
Genes Web page 
US V Castleman, SCOTUS, Mar 2014 is grounds for Impeaching SCOTUS

--
Open source business process management suite built on Java and Eclipse
Turn processes into business applications with Bonita BPM Community Edition
Quickly connect people, data, and systems into organized workflows
Winner of BOSSIE, CODIE, OW2 and Gartner awards
http://p.sf.net/sfu/Bonitasoft
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[Emc-users] Help requested - stepper drivers.

[John Alexander Stewart]

Hi all; Hope this question is considered on-topic, or at least not too far
off.

I'm doing another CNC conversion - my largest yet. G0704 (BF20) style mill,
and I'm wondering about stepper drivers. (Have a Mesa 5i25/7i76 combo;
maybe my next machine will be servo)

I'm wondering about drivers - I have as spares a Gecko G540, some 48v 7.5a
switching power supplies, a couple Gecko 3.5A drivers (the ones in the
G540, but standalone) but wondering:

1) digital drivers, eg automationtechnologiesinc.com ones, are they worth
the price?

2) China drivers look the same as 1); presumably the technology is the
same, just name-badging;

3) Europeans seem to use smaller steppers than North Americans; is there
much savings (e.g., power, heat) from using smaller steppers? I'd guess so.

I'm in Canada, so shipping from the USA or China or Europe is about the
same - expensive - so source location is not an issue.

It does seem a shame to purchase new drivers and power supplies, but I
might as well do this machine "right".

Thanks for any insights you might give.

John A. Stewart.
--
Open source business process management suite built on Java and Eclipse
Turn processes into business applications with Bonita BPM Community Edition
Quickly connect people, data, and systems into organized workflows
Winner of BOSSIE, CODIE, OW2 and Gartner awards
http://p.sf.net/sfu/Bonitasoft
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