Re: [Emc-users] Maybe a minimally printed harmonic drive?

[Bari]

On 1/27/21 10:55 AM, Sam Sokolik wrote:


Nice being able to make things while I sleep..

2 outside side rings - one 202 teeth - one 200 teeth.
Inside flex ring - 200 teeth.  Feels good - for what it is..

http://electronicsam.com/images/greenmachine/IMG_20210127_104237.jpg
http://electronicsam.com/images/greenmachine/IMG_20210127_104628.jpg
http://electronicsam.com/images/greenmachine/IMG_20210127_104354.jpg


Timing belts will take the flex

https://www.youtube.com/watch?v=Y8ZELQdgBbU

https://www.youtube.com/watch?v=2YC-0C8oPUo


Cycloid prototype under microscope

https://www.youtube.com/watch?v=um5GMOBgz6s


Hybrid planetary/harmonic drive - check out how they made it flex

https://www.youtube.com/watch?v=sdRGrTHq4hA



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Re: [Emc-users] Maybe a minimally printed harmonic drive?

[Gregg Eshelman via Emc-users]

A dual bearing block on both sides. Mount the 200 tooth ring to one block and 
the 200+ tooth ring to the shaft on the other for the output. Mount the bar 
with rollers to the other shaft and there's your drive. Put a little flange in 
both rings to keep the flex ring centered. Lube it all very well with silicone 
grease.


 

On Wednesday, January 27, 2021, 9:13:20 PM MST, Sam Sokolik 
 wrote:  
 
 https://youtu.be/nhHDrK6sCRs

On Wed, Jan 27, 2021 at 3:56 PM Gene Heskett  wrote:

> On Wednesday 27 January 2021 16:04:45 Chris Albertson wrote:
>
> > This is a machine-tool related list.  Many of us have 3D printers
> > too. So if you have both additive and subtractive tools available and
> > want to make a harmonic drive may be the best option is to make a
> > hybrid design with some parts of the drive made with different
> > techniques.
> >
> > Metal really is the best material for anything that needs to flex
> > because metal can be made so thin and is still strong when thin.  3D
> > printed plastic must be about the worst material for this.
> >
> > So I ask, Would it be possible to design an easy to make flex gear?
> > I think so.  Most of the flex cup is made on a lathe then you mill
> > the teeth on the outside.  I think it could be machined from a short
> > section of large-diameter steel tube.  Then a bottom plate is press
> > fit.
> >
> > Maybe I could cut the teeth first, like making a gear, then place the
> > part in plastic holder and chuck the holder in a lathe and bore the
> > center out until the ring is very thin.  The trick is to support the
> > ring with a 3D printed rigid backing fixture while boring it.
> >
> > The rest of the harmonic drive could be plastic.
> >
> > The big question for the group here is if the flex ring is something a
> > normal person could make one at a time.  What kind of metal is best?
> > Is this kind of metal available in tiny quanity
> >
> > On Wed, Jan 27, 2021 at 12:36 PM Gregg Eshelman via Emc-users <
> >
> > emc-users@lists.sourceforge.net> wrote:
> > > Instead of a one piece flex cup, how about making a flex ring that
> > > connects to a rigid base with teeth or pins - something that
> > > interlocks but allows radial movement of the flex ring with respect
> > > to the base? No constant bending back and forth to break the print
> > > layers apart.
>
> I like this idea too. Cut or 3d print, the equ of a small pitch box joint
> on the bottom of the flex gear, matched to engage the "fingers" on the
> output disk, it could slid in and out radially on these "box": pins, and
> do it without the flex that normally breaks the cup off the disk at that
> joint. That would replace the spot that is the major breaking point,
> with a hinge like joint, which might prolong its life by many times what
> it is now.
>
> The splined part would then need to be restrained axially to keep it from
> wearing the ends of the cylinder it becomes, from rubbing on the
> housing. Perhaps a very mild dovetail? But that would lead to backlash
> and problems assembling it.
>
> Enough extra length on the cups pins to project a thou or so past the
> disk and drive a flat head 0-80 screw in the the end of the pin, pin
> sized so the angled underside of the head would prevent it from pulling
> apart. Wouldn't take a screw per pin, one in every 4th or 5th pins
> should do it. 3d print a bit of the 0-80's underside head angle on the
> disks fingers and screw head could actually sit below the disk face.
>
> 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)
> If we desire respect for the law, we must first make the law respectable.
>  - Louis D. Brandeis
> Genes Web page 
>
>
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>

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Re: [Emc-users] Maybe a minimally printed harmonic drive?

[Gregg Eshelman via Emc-users]

How about a semi-rigid urethane adhesive bonding the flex ring to a rigid metal 
hub? Have some interlocking features on the inside of the ring and edge of the 
hub to keep it from shearing apart. Smooth-On makes a primer called UreBond II 
that makes their urethane resins and rubbers stick to almost anything.


On Wednesday, January 27, 2021, 2:14:26 PM MST, Gene Heskett 
 wrote:  
 
 On Wednesday 27 January 2021 15:35:00 Gregg Eshelman via Emc-users wrote:

> Instead of a one piece flex cup, how about making a flex ring that
> connects to a rigid base with teeth or pins - something that
> interlocks but allows radial movement of the flex ring with respect to
> the base? No constant bending back and forth to break the print layers
> apart.

I can visualize that but with only one bearing on the driver armature, so 
the formerly flex ring is trapped between the bearing and the outer 2 
parts. This would have the added advantage of needing only a 1 tooth 
difference, but would probably need a counterweight opposite the bearing 
as we've seen in cycloid designs, probably weighing as much as the 
bearing and floating ring combined for decent balance.

Or, still thinking outside the box, even the triplet of small bearings on 
one end of the driving armature. Or better yet, a circular disk with a 
lot of empty space in it to keep the ring from flexing so much as it 
fly's around, with a smaller cheaper bearing centered in that disk, but 
being swung on an offcenter pin on the driving axle. With Sams fine 
teeth, but only a 1 tooth difference, a possible 400/1 ratio?

The moving output ring might need to be restrained from resonane effects 
by a BIG and costly bearing in the final version but bolted to a stiff 
disk with a smaller double bearing'd output shaft might do for testing 
to see if its practical.  
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Re: [Emc-users] Maybe a minimally printed harmonic drive?

[Sam Sokolik]

https://youtu.be/nhHDrK6sCRs

On Wed, Jan 27, 2021 at 3:56 PM Gene Heskett  wrote:

> On Wednesday 27 January 2021 16:04:45 Chris Albertson wrote:
>
> > This is a machine-tool related list.   Many of us have 3D printers
> > too. So if you have both additive and subtractive tools available and
> > want to make a harmonic drive may be the best option is to make a
> > hybrid design with some parts of the drive made with different
> > techniques.
> >
> > Metal really is the best material for anything that needs to flex
> > because metal can be made so thin and is still strong when thin.   3D
> > printed plastic must be about the worst material for this.
> >
> > So I ask, Would it be possible to design an easy to make flex gear?
> > I think so.   Most of the flex cup is made on a lathe then you mill
> > the teeth on the outside.  I think it could be machined from a short
> > section of large-diameter steel tube.  Then a bottom plate is press
> > fit.
> >
> > Maybe I could cut the teeth first, like making a gear, then place the
> > part in plastic holder and chuck the holder in a lathe and bore the
> > center out until the ring is very thin.   The trick is to support the
> > ring with a 3D printed rigid backing fixture while boring it.
> >
> > The rest of the harmonic drive could be plastic.
> >
> > The big question for the group here is if the flex ring is something a
> > normal person could make one at a time.  What kind of metal is best?
> > Is this kind of metal available in tiny quanity
> >
> > On Wed, Jan 27, 2021 at 12:36 PM Gregg Eshelman via Emc-users <
> >
> > emc-users@lists.sourceforge.net> wrote:
> > > Instead of a one piece flex cup, how about making a flex ring that
> > > connects to a rigid base with teeth or pins - something that
> > > interlocks but allows radial movement of the flex ring with respect
> > > to the base? No constant bending back and forth to break the print
> > > layers apart.
>
> I like this idea too. Cut or 3d print, the equ of a small pitch box joint
> on the bottom of the flex gear, matched to engage the "fingers" on the
> output disk, it could slid in and out radially on these "box": pins, and
> do it without the flex that normally breaks the cup off the disk at that
> joint. That would replace the spot that is the major breaking point,
> with a hinge like joint, which might prolong its life by many times what
> it is now.
>
> The splined part would then need to be restrained axially to keep it from
> wearing the ends of the cylinder it becomes, from rubbing on the
> housing. Perhaps a very mild dovetail? But that would lead to backlash
> and problems assembling it.
>
> Enough extra length on the cups pins to project a thou or so past the
> disk and drive a flat head 0-80 screw in the the end of the pin, pin
> sized so the angled underside of the head would prevent it from pulling
> apart. Wouldn't take a screw per pin, one in every 4th or 5th pins
> should do it. 3d print a bit of the 0-80's underside head angle on the
> disks fingers and screw head could actually sit below the disk face.
>
> 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)
> If we desire respect for the law, we must first make the law respectable.
>  - Louis D. Brandeis
> Genes Web page 
>
>
> ___
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> https://lists.sourceforge.net/lists/listinfo/emc-users
>

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Re: [Emc-users] Fanuc Servos?

[Jon Elson]

On 01/27/2021 11:35 AM, Todd Zuercher wrote:

How useable are Fanuc's servos and amps with Linuxcnc?  My understanding is 
that it is very involved to try to force them to work with anything other than 
a Fanuc control
I make converters for the two most common types of Fanuc 
encoders used on brushless motors.
I also make a digital servo amp for them that can be used 
with my PWM controller.
The older "red cap" motors had encoders with standard 
quadrature plus index output, but the commutation signal was 
proprietary.  I have a board that converts the commutation 
to industry-compatible "Hall" signals.


The newer type is serial, but my converter produces 
industry-compatible quadrature plus index, plus the "Hall" 
signals. Note there are absolute and incremental versions of 
these encoders.
The problem with the incremental versions, like (alpha)I64, 
is that they are lost when power is applied, so they need 
you to crank the motor past the index location by hand after 
every power on, before commutation is available.  So, these 
encoders need power-off brakes and battery backup if the 
control is ever turned off.
The absolute version have additional low-res data tracks 
that allow the encoder to know the angle immediately at 
power-on, so no battery is needed to have commutation 
immediately on power on.


Now, the Fanuc servo amps are more difficult, as about 1984 
they stopped releasing any documentation on their 
electronics.  So, it is essentially impossible to find any 
schematics or connection info for their amps.  Most of the 
brushless amps take SIX PWM signals per axis, so
the controller sends separate PWM to EACH transistor.  This 
moves all the smarts to the controller, but it complicates 
things a bit.


Jon


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Re: [Emc-users] Maybe a minimally printed harmonic drive?

[Gene Heskett]

On Wednesday 27 January 2021 16:04:45 Chris Albertson wrote:

> This is a machine-tool related list.   Many of us have 3D printers
> too. So if you have both additive and subtractive tools available and
> want to make a harmonic drive may be the best option is to make a
> hybrid design with some parts of the drive made with different
> techniques.
>
> Metal really is the best material for anything that needs to flex
> because metal can be made so thin and is still strong when thin.   3D
> printed plastic must be about the worst material for this.
>
> So I ask, Would it be possible to design an easy to make flex gear?  
> I think so.   Most of the flex cup is made on a lathe then you mill
> the teeth on the outside.  I think it could be machined from a short
> section of large-diameter steel tube.  Then a bottom plate is press
> fit.
>
> Maybe I could cut the teeth first, like making a gear, then place the
> part in plastic holder and chuck the holder in a lathe and bore the
> center out until the ring is very thin.   The trick is to support the
> ring with a 3D printed rigid backing fixture while boring it.
>
> The rest of the harmonic drive could be plastic.
>
> The big question for the group here is if the flex ring is something a
> normal person could make one at a time.  What kind of metal is best? 
> Is this kind of metal available in tiny quanity
>
> On Wed, Jan 27, 2021 at 12:36 PM Gregg Eshelman via Emc-users <
>
> emc-users@lists.sourceforge.net> wrote:
> > Instead of a one piece flex cup, how about making a flex ring that
> > connects to a rigid base with teeth or pins - something that
> > interlocks but allows radial movement of the flex ring with respect
> > to the base? No constant bending back and forth to break the print
> > layers apart.

I like this idea too. Cut or 3d print, the equ of a small pitch box joint 
on the bottom of the flex gear, matched to engage the "fingers" on the 
output disk, it could slid in and out radially on these "box": pins, and 
do it without the flex that normally breaks the cup off the disk at that 
joint. That would replace the spot that is the major breaking point, 
with a hinge like joint, which might prolong its life by many times what 
it is now.

The splined part would then need to be restrained axially to keep it from 
wearing the ends of the cylinder it becomes, from rubbing on the 
housing. Perhaps a very mild dovetail? But that would lead to backlash 
and problems assembling it.

Enough extra length on the cups pins to project a thou or so past the 
disk and drive a flat head 0-80 screw in the the end of the pin, pin 
sized so the angled underside of the head would prevent it from pulling 
apart. Wouldn't take a screw per pin, one in every 4th or 5th pins 
should do it. 3d print a bit of the 0-80's underside head angle on the 
disks fingers and screw head could actually sit below the disk face.

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)
If we desire respect for the law, we must first make the law respectable.
 - Louis D. Brandeis
Genes Web page 


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Re: [Emc-users] Maybe a minimally printed harmonic drive?

[andy pugh]

On Wed, 27 Jan 2021 at 21:07, Chris Albertson  wrote:

> So I ask, Would it be possible to design an easy to make flex gear?   I
> think so.

I am not so sure. In fact I am so not-sure that I am building an EDM
grinder to make hardened (or carbide) tooling with the right profile.

-- 
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, 1912


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Re: [Emc-users] Fanuc Servos?

[Todd Zuercher]

Yes, it is possible to read the encoders of of some red caps with Linuxcnc.  
But not all red caps are the same, other than they are all 3 phase motors, 
(synchronous or asynchronous).  Some have incremental encoders or some are 
serial and I'm pretty sure there are multiple kinds of serial encoders.

But what about the amps?  All the ones I've worked with (from about 2002+) were 
connected to the Fanuc control via an optical serial bus.  Are these all 
hopeless?  On the surface they don't look to be any more help than an STMBL 
drive made from unobtanium.

Todd Zuercher
P. Graham Dunn Inc.
630 Henry Street 
Dalton, Ohio 44618
Phone:  (330)828-2105ext. 2031

-Original Message-
From: andy pugh  
Sent: Wednesday, January 27, 2021 3:33 PM
To: Enhanced Machine Controller (EMC) 
Subject: Re: [Emc-users] Fanuc Servos?

On Wed, 27 Jan 2021 at 18:11, Todd Zuercher  wrote:
>
> How useable are Fanuc's servos and amps with Linuxcnc?

The red-caps are pretty easy, I think. The 4-line commutation signal is handled 
by a Pico hardware interface, or can be handled in software (the blcd 
component) and converted to standard Hall or position.
Though possibly not as fast as you need for all applications.

I think that the STMBL supports both red-cap and yellow-cap, but there is the 
usual problem with STMBL, availability.

--
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, 1912


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Re: [Emc-users] Maybe a minimally printed harmonic drive?

[Gene Heskett]

On Wednesday 27 January 2021 15:35:00 Gregg Eshelman via Emc-users wrote:

> Instead of a one piece flex cup, how about making a flex ring that
> connects to a rigid base with teeth or pins - something that
> interlocks but allows radial movement of the flex ring with respect to
> the base? No constant bending back and forth to break the print layers
> apart.

I can visualize that but with only one bearing on the driver armature, so 
the formerly flex ring is trapped between the bearing and the outer 2 
parts. This would have the added advantage of needing only a 1 tooth 
difference, but would probably need a counterweight opposite the bearing 
as we've seen in cycloid designs, probably weighing as much as the 
bearing and floating ring combined for decent balance.

Or, still thinking outside the box, even the triplet of small bearings on 
one end of the driving armature. Or better yet, a circular disk with a 
lot of empty space in it to keep the ring from flexing so much as it 
fly's around, with a smaller cheaper bearing centered in that disk, but 
being swung on an offcenter pin on the driving axle. With Sams fine 
teeth, but only a 1 tooth difference, a possible 400/1 ratio?

The moving output ring might need to be restrained from resonane effects 
by a BIG and costly bearing in the final version but bolted to a stiff 
disk with a smaller double bearing'd output shaft might do for testing 
to see if its practical.

> On Wednesday, January 27, 2021, 12:06:27 PM MST, Sam Sokolik
>  wrote:
>
>  well - that is the plan... but I need to create a decent housing to
> mount it all...  :)  SMOM  (simple matter of machining)
>
> On Wed, Jan 27, 2021 at 12:59 PM Chris Albertson
> 
>
> wrote:
> > Now, if you will, place it on a motor and run it for 24 hours and
> > let us know what happens.
> >
> > On Wed, Jan 27, 2021 at 8:59 AM Sam Sokolik  
wrote:
> > > Nice being able to make things while I sleep..
> > >
> > > 2 outside side rings - one 202 teeth - one 200 teeth.
> > > Inside flex ring - 200 teeth.  Feels good - for what it is..
> > >
> > > http://electronicsam.com/images/greenmachine/IMG_20210127_104237.j
> > >pg
> > > http://electronicsam.com/images/greenmachine/IMG_20210127_104628.j
> > >pg
> > > http://electronicsam.com/images/greenmachine/IMG_20210127_104354.j
> > >pg

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)
If we desire respect for the law, we must first make the law respectable.
 - Louis D. Brandeis
Genes Web page 


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Re: [Emc-users] Maybe a minimally printed harmonic drive?

[Chris Albertson]

This is a machine-tool related list.   Many of us have 3D printers too.
 So if you have both additive and subtractive tools available and want to
make a harmonic drive may be the best option is to make a hybrid design
with some parts of the drive made with different techniques.

Metal really is the best material for anything that needs to flex because
metal can be made so thin and is still strong when thin.   3D printed
plastic must be about the worst material for this.

So I ask, Would it be possible to design an easy to make flex gear?   I
think so.   Most of the flex cup is made on a lathe then you mill the teeth
on the outside.  I think it could be machined from a short section of
large-diameter steel tube.  Then a bottom plate is press fit.

Maybe I could cut the teeth first, like making a gear, then place the part
in plastic holder and chuck the holder in a lathe and bore the center out
until the ring is very thin.   The trick is to support the ring with a 3D
printed rigid backing fixture while boring it.

The rest of the harmonic drive could be plastic.

The big question for the group here is if the flex ring is something a
normal person could make one at a time.  What kind of metal is best?  Is
this kind of metal available in tiny quanity

On Wed, Jan 27, 2021 at 12:36 PM Gregg Eshelman via Emc-users <
emc-users@lists.sourceforge.net> wrote:

> Instead of a one piece flex cup, how about making a flex ring that
> connects to a rigid base with teeth or pins - something that interlocks but
> allows radial movement of the flex ring with respect to the base? No
> constant bending back and forth to break the print layers apart.
>
-- 

Chris Albertson
Redondo Beach, California

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Re: [Emc-users] Maybe a minimally printed harmonic drive?

[Gregg Eshelman via Emc-users]

Instead of a one piece flex cup, how about making a flex ring that connects to 
a rigid base with teeth or pins - something that interlocks but allows radial 
movement of the flex ring with respect to the base? No constant bending back 
and forth to break the print layers apart.


On Wednesday, January 27, 2021, 12:06:27 PM MST, Sam Sokolik 
 wrote:  
 
 well - that is the plan... but I need to create a decent housing to mount
it all...  :)  SMOM  (simple matter of machining)

On Wed, Jan 27, 2021 at 12:59 PM Chris Albertson 
wrote:

> Now, if you will, place it on a motor and run it for 24 hours and let us
> know what happens.
>
> On Wed, Jan 27, 2021 at 8:59 AM Sam Sokolik  wrote:
>
> > Nice being able to make things while I sleep..
> >
> > 2 outside side rings - one 202 teeth - one 200 teeth.
> > Inside flex ring - 200 teeth.  Feels good - for what it is..
> >
> > http://electronicsam.com/images/greenmachine/IMG_20210127_104237.jpg
> > http://electronicsam.com/images/greenmachine/IMG_20210127_104628.jpg
> > http://electronicsam.com/images/greenmachine/IMG_20210127_104354.jpg  
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Re: [Emc-users] Fanuc Servos?

[andy pugh]

On Wed, 27 Jan 2021 at 18:11, Todd Zuercher  wrote:
>
> How useable are Fanuc's servos and amps with Linuxcnc?

The red-caps are pretty easy, I think. The 4-line commutation signal
is handled by a Pico hardware interface, or can be handled in software
(the blcd component) and converted to standard Hall or position.
Though possibly not as fast as you need for all applications.

I think that the STMBL supports both red-cap and yellow-cap, but there
is the usual problem with STMBL, availability.

-- 
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, 1912


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Re: [Emc-users] Maybe a minimally printed harmonic drive?

[Chris Albertson]

For tests I tend to do things like clamp it to a drill press table and
power it with the chuck.,  Or even use a hand-held drill motor to very if
gears mesh.  What I've found is plastic gears need to be about 3X larger
than metal ones.

On Wed, Jan 27, 2021 at 11:06 AM Sam Sokolik  wrote:

> well - that is the plan... but I need to create a decent housing to mount
> it all...  :)  SMOM  (simple matter of machining)
>
> On Wed, Jan 27, 2021 at 12:59 PM Chris Albertson <
> albertson.ch...@gmail.com>
> wrote:
>
> > Now, if you will, place it on a motor and run it for 24 hours and let us
> > know what happens.
> >
> > On Wed, Jan 27, 2021 at 8:59 AM Sam Sokolik  wrote:
> >
> > > Nice being able to make things while I sleep..
> > >
> > > 2 outside side rings - one 202 teeth - one 200 teeth.
> > > Inside flex ring - 200 teeth.  Feels good - for what it is..
> > >
> > > http://electronicsam.com/images/greenmachine/IMG_20210127_104237.jpg
> > > http://electronicsam.com/images/greenmachine/IMG_20210127_104628.jpg
> > > http://electronicsam.com/images/greenmachine/IMG_20210127_104354.jpg
> > >
> > >
> > >
> > >
> > > On Tue, Jan 26, 2021 at 10:37 PM Sam Sokolik 
> wrote:
> > >
> > > > I will give it a try - printing a 200 tooth and a taller 200 tooth
> flex
> > > > gear.
> > > >
> > > > http://electronicsam.com/images/greenmachine/IMG_20210126_22.jpg
> > > >
> > > > On Tue, Jan 26, 2021 at 8:07 PM Chris Albertson <
> > > albertson.ch...@gmail.com>
> > > > wrote:
> > > >
> > > >> I could read it well enough to see that they only quote prices.
> > The
> > > >> old saying is that if you have to ask the price you can't afford it.
> > > >>
> > > >> I can see where plastic gearboxes might be a good solution in
> perhaps
> > > food
> > > >> service or other places where you can't have contamination from
> > > >> lubricants.  Or maybe if you need to have it work while in contact
> > with
> > > >> saltwater.
> > > >>
> > > >> On Tue, Jan 26, 2021 at 3:27 PM andy pugh 
> wrote:
> > > >>
> > > >> > On Tue, 26 Jan 2021 at 22:38, Chris Albertson <
> > > >> albertson.ch...@gmail.com>
> > > >> > wrote:
> > > >> > >
> > > >> > > Igus makes 1st rate stuff.
> > > >> > ...
> > > >> > > My German language skill is minimal
> > > >> > > but it appears prices are quoted, not posted online.
> > > >> >
> > > >> > English: https://www.igus.co.uk/product/20413
> > > >> >
> > > >> > (Also available in dozens of other languages by pressing the
> > language
> > > >> > button top-right)
> > > >> >
> > > >> > --
> > > >> > 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, 1912
> > > >> >
> > > >> >
> > > >> > ___
> > > >> > Emc-users mailing list
> > > >> > Emc-users@lists.sourceforge.net
> > > >> > https://lists.sourceforge.net/lists/listinfo/emc-users
> > > >> >
> > > >>
> > > >>
> > > >> --
> > > >>
> > > >> Chris Albertson
> > > >> Redondo Beach, California
> > > >>
> > > >> ___
> > > >> Emc-users mailing list
> > > >> Emc-users@lists.sourceforge.net
> > > >> https://lists.sourceforge.net/lists/listinfo/emc-users
> > > >>
> > > >
> > >
> > > ___
> > > Emc-users mailing list
> > > Emc-users@lists.sourceforge.net
> > > https://lists.sourceforge.net/lists/listinfo/emc-users
> > >
> >
> >
> > --
> >
> > Chris Albertson
> > Redondo Beach, California
> >
> > ___
> > Emc-users mailing list
> > Emc-users@lists.sourceforge.net
> > https://lists.sourceforge.net/lists/listinfo/emc-users
> >
>
> ___
> Emc-users mailing list
> Emc-users@lists.sourceforge.net
> https://lists.sourceforge.net/lists/listinfo/emc-users
>


-- 

Chris Albertson
Redondo Beach, California

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Re: [Emc-users] Maybe a minimally printed harmonic drive?

[Sam Sokolik]

well - that is the plan... but I need to create a decent housing to mount
it all...  :)  SMOM  (simple matter of machining)

On Wed, Jan 27, 2021 at 12:59 PM Chris Albertson 
wrote:

> Now, if you will, place it on a motor and run it for 24 hours and let us
> know what happens.
>
> On Wed, Jan 27, 2021 at 8:59 AM Sam Sokolik  wrote:
>
> > Nice being able to make things while I sleep..
> >
> > 2 outside side rings - one 202 teeth - one 200 teeth.
> > Inside flex ring - 200 teeth.  Feels good - for what it is..
> >
> > http://electronicsam.com/images/greenmachine/IMG_20210127_104237.jpg
> > http://electronicsam.com/images/greenmachine/IMG_20210127_104628.jpg
> > http://electronicsam.com/images/greenmachine/IMG_20210127_104354.jpg
> >
> >
> >
> >
> > On Tue, Jan 26, 2021 at 10:37 PM Sam Sokolik  wrote:
> >
> > > I will give it a try - printing a 200 tooth and a taller 200 tooth flex
> > > gear.
> > >
> > > http://electronicsam.com/images/greenmachine/IMG_20210126_22.jpg
> > >
> > > On Tue, Jan 26, 2021 at 8:07 PM Chris Albertson <
> > albertson.ch...@gmail.com>
> > > wrote:
> > >
> > >> I could read it well enough to see that they only quote prices.
> The
> > >> old saying is that if you have to ask the price you can't afford it.
> > >>
> > >> I can see where plastic gearboxes might be a good solution in perhaps
> > food
> > >> service or other places where you can't have contamination from
> > >> lubricants.  Or maybe if you need to have it work while in contact
> with
> > >> saltwater.
> > >>
> > >> On Tue, Jan 26, 2021 at 3:27 PM andy pugh  wrote:
> > >>
> > >> > On Tue, 26 Jan 2021 at 22:38, Chris Albertson <
> > >> albertson.ch...@gmail.com>
> > >> > wrote:
> > >> > >
> > >> > > Igus makes 1st rate stuff.
> > >> > ...
> > >> > > My German language skill is minimal
> > >> > > but it appears prices are quoted, not posted online.
> > >> >
> > >> > English: https://www.igus.co.uk/product/20413
> > >> >
> > >> > (Also available in dozens of other languages by pressing the
> language
> > >> > button top-right)
> > >> >
> > >> > --
> > >> > 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, 1912
> > >> >
> > >> >
> > >> > ___
> > >> > Emc-users mailing list
> > >> > Emc-users@lists.sourceforge.net
> > >> > https://lists.sourceforge.net/lists/listinfo/emc-users
> > >> >
> > >>
> > >>
> > >> --
> > >>
> > >> Chris Albertson
> > >> Redondo Beach, California
> > >>
> > >> ___
> > >> Emc-users mailing list
> > >> Emc-users@lists.sourceforge.net
> > >> https://lists.sourceforge.net/lists/listinfo/emc-users
> > >>
> > >
> >
> > ___
> > Emc-users mailing list
> > Emc-users@lists.sourceforge.net
> > https://lists.sourceforge.net/lists/listinfo/emc-users
> >
>
>
> --
>
> Chris Albertson
> Redondo Beach, California
>
> ___
> Emc-users mailing list
> Emc-users@lists.sourceforge.net
> https://lists.sourceforge.net/lists/listinfo/emc-users
>

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Re: [Emc-users] Maybe a minimally printed harmonic drive?

[Chris Albertson]

Now, if you will, place it on a motor and run it for 24 hours and let us
know what happens.

On Wed, Jan 27, 2021 at 8:59 AM Sam Sokolik  wrote:

> Nice being able to make things while I sleep..
>
> 2 outside side rings - one 202 teeth - one 200 teeth.
> Inside flex ring - 200 teeth.  Feels good - for what it is..
>
> http://electronicsam.com/images/greenmachine/IMG_20210127_104237.jpg
> http://electronicsam.com/images/greenmachine/IMG_20210127_104628.jpg
> http://electronicsam.com/images/greenmachine/IMG_20210127_104354.jpg
>
>
>
>
> On Tue, Jan 26, 2021 at 10:37 PM Sam Sokolik  wrote:
>
> > I will give it a try - printing a 200 tooth and a taller 200 tooth flex
> > gear.
> >
> > http://electronicsam.com/images/greenmachine/IMG_20210126_22.jpg
> >
> > On Tue, Jan 26, 2021 at 8:07 PM Chris Albertson <
> albertson.ch...@gmail.com>
> > wrote:
> >
> >> I could read it well enough to see that they only quote prices.  The
> >> old saying is that if you have to ask the price you can't afford it.
> >>
> >> I can see where plastic gearboxes might be a good solution in perhaps
> food
> >> service or other places where you can't have contamination from
> >> lubricants.  Or maybe if you need to have it work while in contact with
> >> saltwater.
> >>
> >> On Tue, Jan 26, 2021 at 3:27 PM andy pugh  wrote:
> >>
> >> > On Tue, 26 Jan 2021 at 22:38, Chris Albertson <
> >> albertson.ch...@gmail.com>
> >> > wrote:
> >> > >
> >> > > Igus makes 1st rate stuff.
> >> > ...
> >> > > My German language skill is minimal
> >> > > but it appears prices are quoted, not posted online.
> >> >
> >> > English: https://www.igus.co.uk/product/20413
> >> >
> >> > (Also available in dozens of other languages by pressing the language
> >> > button top-right)
> >> >
> >> > --
> >> > 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, 1912
> >> >
> >> >
> >> > ___
> >> > Emc-users mailing list
> >> > Emc-users@lists.sourceforge.net
> >> > https://lists.sourceforge.net/lists/listinfo/emc-users
> >> >
> >>
> >>
> >> --
> >>
> >> Chris Albertson
> >> Redondo Beach, California
> >>
> >> ___
> >> Emc-users mailing list
> >> Emc-users@lists.sourceforge.net
> >> https://lists.sourceforge.net/lists/listinfo/emc-users
> >>
> >
>
> ___
> Emc-users mailing list
> Emc-users@lists.sourceforge.net
> https://lists.sourceforge.net/lists/listinfo/emc-users
>


-- 

Chris Albertson
Redondo Beach, California

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[Emc-users] Fanuc Servos?

[Todd Zuercher]

How useable are Fanuc's servos and amps with Linuxcnc?  My understanding is 
that it is very involved to try to force them to work with anything other than 
a Fanuc control, if it is even possible.  With the newer it is the worse it 
gets.  What is the current lowdown on this exactly, approximately what age or 
amp models are impossible.  For the ones that are possible, how workable are 
they really.  I've seen some theoretical discussions, of how some of them might 
be controlled, but no real proof of how well it actually works in practice.

Or are we still at the point on a 20 year old machine we want to refit for use 
in a production factory setting, where we are best off stripping every thing 
with a Fanuc label off, reselling what we can on ebay, and buying something 
more generic to replace it with (or sticking with Fanuc)?

Todd Zuercher
P. Graham Dunn Inc.
630 Henry Street
Dalton, Ohio 44618
Phone:  (330)828-2105ext. 2031


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Re: [Emc-users] Maybe a minimally printed harmonic drive?

[Sam Sokolik]

Nice being able to make things while I sleep..

2 outside side rings - one 202 teeth - one 200 teeth.
Inside flex ring - 200 teeth.  Feels good - for what it is..

http://electronicsam.com/images/greenmachine/IMG_20210127_104237.jpg
http://electronicsam.com/images/greenmachine/IMG_20210127_104628.jpg
http://electronicsam.com/images/greenmachine/IMG_20210127_104354.jpg




On Tue, Jan 26, 2021 at 10:37 PM Sam Sokolik  wrote:

> I will give it a try - printing a 200 tooth and a taller 200 tooth flex
> gear.
>
> http://electronicsam.com/images/greenmachine/IMG_20210126_22.jpg
>
> On Tue, Jan 26, 2021 at 8:07 PM Chris Albertson 
> wrote:
>
>> I could read it well enough to see that they only quote prices.  The
>> old saying is that if you have to ask the price you can't afford it.
>>
>> I can see where plastic gearboxes might be a good solution in perhaps food
>> service or other places where you can't have contamination from
>> lubricants.  Or maybe if you need to have it work while in contact with
>> saltwater.
>>
>> On Tue, Jan 26, 2021 at 3:27 PM andy pugh  wrote:
>>
>> > On Tue, 26 Jan 2021 at 22:38, Chris Albertson <
>> albertson.ch...@gmail.com>
>> > wrote:
>> > >
>> > > Igus makes 1st rate stuff.
>> > ...
>> > > My German language skill is minimal
>> > > but it appears prices are quoted, not posted online.
>> >
>> > English: https://www.igus.co.uk/product/20413
>> >
>> > (Also available in dozens of other languages by pressing the language
>> > button top-right)
>> >
>> > --
>> > 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, 1912
>> >
>> >
>> > ___
>> > Emc-users mailing list
>> > Emc-users@lists.sourceforge.net
>> > https://lists.sourceforge.net/lists/listinfo/emc-users
>> >
>>
>>
>> --
>>
>> Chris Albertson
>> Redondo Beach, California
>>
>> ___
>> Emc-users mailing list
>> Emc-users@lists.sourceforge.net
>> https://lists.sourceforge.net/lists/listinfo/emc-users
>>
>

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