Re: [Emc-users] Sheet metal operations.

[John Dammeyer]

> From: andy pugh [mailto:bodge...@gmail.com]
> On Tue, 2 Feb 2021 at 17:22, John Dammeyer  wrote:
> 
> > What's a CNC slotting head?
> 
> It's like a slotting head, but CNC :-)
> 
> The idea would be to have a CNC controlled tool rotation combined with
> the conventional reciprocation.
> 
> --
> atp

OK.  Let's see if I have that right.  My Spindle is driven (well will be as 
it's currently still  0V-10V) with step and direction.  There will be an index 
and of course encoder on the spindle.  

Once I have step/dir instead of PWM/DIR I should be able to tell the spindle 
where I'd like it to be.  So if I have a rectangular punch held and keyed in 
some repeatable fashion (better than the R8 pin) then I should be able to tell 
it to turn to 45 degrees and then move down.  (or knee move up).  

The motor holds the spindle pretty well solid.  In fact annoyingly so because 
unless I disable the AC servo it won't let me turn it.  I imagine though a 
brake is probably needed to ultimately hold it really stiff.

Is that what you mean?

But can you actually configure LinuxCNC to both run spindle as an RPM axis and 
also a positioning axis?  I realize the loop is closed for tapping but 60 teeth 
per rev for the encoder isn't the same as 3600 for the nearest 10th of a degree.

John






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Re: [Emc-users] lathe paths with linux cnc and CAD software

[Gregg Eshelman via Emc-users]

There's Heeks Cad/CAM. $10 for funding development. There's no limitations to 
the free version, the only difference is the free version inserts a note about 
the program at the beginning of the G-Code it outputs. Easy to delete with any 
text editor. 


On Tuesday, February 2, 2021, 12:33:20 PM MST, Chris Albertson 
 wrote:  
 
 The free Fusion360 license allows 2 and 3-axis milling, adaptive clearing,
and turning.  This is likely enough for most people.

What you can't do is 4-axis and 5-axis milling.  To enable that you do have
to pay for a license

more info here: https://www.autodesk.com/products/fusion-360/personal

The other CAD options completely lack any build-in CAM functions.  So it is
pointless.  Yes you could design using CA then hand-code you g-code but
then you loose the guarantee that the g-code follows the design because
there is an "air gap" in the work flow and it is VERY hard to make organic
looking shaps with hand made g-code.

My criteria for choosing software is "Could I use it to make a battery
operated drill with the over-molded rounded case that fits your hand.
Fusion360, even the free version would allow this if you split the case
laterally to make to halves that assemble together.    You couldn't use the
free Fusion for a one-piece model of a drill because to mill that you'd
need at least 4 axis

If you do need better CAM to run a more complex machine tool and you are on
a limited budget.  There is a way to get SolidWorks at no cost if you are
an EAA member.  SoldWorks is the only other CAD I know of that includes CAM
and can be had for zero or very low cost.  
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Re: [Emc-users] Sheet metal operations.

[andy pugh]

On Tue, 2 Feb 2021 at 17:22, John Dammeyer  wrote:

> What's a CNC slotting head?

It's like a slotting head, but CNC :-)

The idea would be to have a CNC controlled tool rotation combined with
the conventional reciprocation.

-- 
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] lathe paths with linux cnc and CAD software

[R C]

On 2/2/21 2:13 PM, Chris Albertson wrote:

You are reading old posts that were at best inaccurate.  Yes, you can
import/export data in Fusion. And they do limit you to "only" 10 open
projects at the same time.  So you have to close one to open an 11th one at
the same time.  Go to the Fusion360 web site for the correct information.


That is what I just read in Dave's post




The free license for Fusion is different, but of all the free CAD/CAM
systems Fusion360 still has the best feature list. and the best support.



I'll check what the licenses are.  Free of course is always good, and of 
course comes with limitations. However, it ia a hobby that I play 
with/explore so now and then and don't want to dump mayor money in (the 
mill and lathe were given to me.)





How do you convert your FreeCAD data to G-code?   This is the biggest
problem I have with it, how to move the design to a lathe or mill.   I only
see a path for that if doing 2 1/2 D milling.



well, with freecad you can set up a job, and create a path within that 
job.  You can select  for what application/environment you want to 
create the g-code/path and linuxcnc is an option. (However I do see that 
sometimes these paths are not 'optimal'  and sometimes even wrong.  But 
again,  hey , it's free, and  with tinkering I can get around it.  (Of 
course a 'real' machine shop would never do that, of course pay for  
good quality software as an investment. With me it is not an investment, 
it is just money spent.


The g-code path is a file that you can 'export'  (I do that either with 
nfs, or even ssh/scp, so it's on the machine that runs linuxcnc.  In 
linuxcnc with axis I just pic it up, run it as a "simulation first and 
if I like what I see try to make the part.


Linuxcnc is cool, it can do a lot more than I (as a hobbyist for sure) 
would ever need.  Also, I like to tinker with electronics, the machines 
themselves, and this forum is great for that.)






On Tue, Feb 2, 2021 at 11:44 AM R C  wrote:


Hi Chris,

well, I am only looking into something different for making some parts
on a lathe,  I looked at fusion360, but what I hear is that you can't
'export' projects, or import, and also you can only have a few.  Not
that I do a lot of work, but it seems to be a hassle.

I have a sherline (rebranded to Paxton/Patterson mill, so that is 3 axis
as for now).

I use freecad for the mill, and that's more than I'd need already.  I
was suprised that it doesn't generate code for lathes (although, I have
the impression that people have been working on it, but not seen
something really yet.  (also I mght not know enough about machining, to
understand why it is difficult to create something for a lathe, but not
for a mill?)


There's that  gentleman here that has some modules with an interface
(sorry man forgot your name), but somehow I never got that to work in
linux cnc. (No movement, maybe I did get parameters wrong, maybe not
setup right, dunno)

So I am still looking, it is fairly easy for me to make thing is freecad,


Also, I don't have a "professional machine shop" so I am not looking to
spent significant amounts on software.


Ron



On 2/2/21 12:30 PM, Chris Albertson wrote:

The free Fusion360 license allows 2 and 3-axis milling, adaptive

clearing,

and turning.   This is likely enough for most people.

What you can't do is 4-axis and 5-axis milling.  To enable that you do

have

to pay for a license

more info here: https://www.autodesk.com/products/fusion-360/personal

The other CAD options completely lack any build-in CAM functions.  So it

is

pointless.  Yes you could design using CA then hand-code you g-code but
then you loose the guarantee that the g-code follows the design because
there is an "air gap" in the work flow and it is VERY hard to make

organic

looking shaps with hand made g-code.

My criteria for choosing software is "Could I use it to make a battery
operated drill with the over-molded rounded case that fits your hand.
Fusion360, even the free version would allow this if you split the case
laterally to make to halves that assemble together.You couldn't use

the

free Fusion for a one-piece model of a drill because to mill that you'd
need at least 4 axis

If you do need better CAM to run a more complex machine tool and you are

on

a limited budget.   There is a way to get SolidWorks at no cost if you

are

an EAA member.  SoldWorks is the only other CAD I know of that includes

CAM

and can be had for zero or very low cost.

On Tue, Feb 2, 2021 at 10:18 AM R C  wrote:


Hello,


I have been busy for a while with that pay check thing, and didn't have
much time to look into  creating g-code, that I can use  in linux cnc
for a lathe.


Is there anything "new" yet?  I was thinking about using fusion360,  but
I heard that is on it's way out for even a reasonable hobby priced

license


are there any alternatives?


I found this video, and was wondering how well this works, has anyone
done this?

Re: [Emc-users] lathe paths with linux cnc and CAD software

[Chris Albertson]

You are reading old posts that were at best inaccurate.  Yes, you can
import/export data in Fusion. And they do limit you to "only" 10 open
projects at the same time.  So you have to close one to open an 11th one at
the same time.  Go to the Fusion360 web site for the correct information.

The free license for Fusion is different, but of all the free CAD/CAM
systems Fusion360 still has the best feature list. and the best support.

How do you convert your FreeCAD data to G-code?   This is the biggest
problem I have with it, how to move the design to a lathe or mill.   I only
see a path for that if doing 2 1/2 D milling.

On Tue, Feb 2, 2021 at 11:44 AM R C  wrote:

> Hi Chris,
>
> well, I am only looking into something different for making some parts
> on a lathe,  I looked at fusion360, but what I hear is that you can't
> 'export' projects, or import, and also you can only have a few.  Not
> that I do a lot of work, but it seems to be a hassle.
>
> I have a sherline (rebranded to Paxton/Patterson mill, so that is 3 axis
> as for now).
>
> I use freecad for the mill, and that's more than I'd need already.  I
> was suprised that it doesn't generate code for lathes (although, I have
> the impression that people have been working on it, but not seen
> something really yet.  (also I mght not know enough about machining, to
> understand why it is difficult to create something for a lathe, but not
> for a mill?)
>
>
> There's that  gentleman here that has some modules with an interface
> (sorry man forgot your name), but somehow I never got that to work in
> linux cnc. (No movement, maybe I did get parameters wrong, maybe not
> setup right, dunno)
>
> So I am still looking, it is fairly easy for me to make thing is freecad,
>
>
> Also, I don't have a "professional machine shop" so I am not looking to
> spent significant amounts on software.
>
>
> Ron
>
>
>
> On 2/2/21 12:30 PM, Chris Albertson wrote:
> > The free Fusion360 license allows 2 and 3-axis milling, adaptive
> clearing,
> > and turning.   This is likely enough for most people.
> >
> > What you can't do is 4-axis and 5-axis milling.  To enable that you do
> have
> > to pay for a license
> >
> > more info here: https://www.autodesk.com/products/fusion-360/personal
> >
> > The other CAD options completely lack any build-in CAM functions.  So it
> is
> > pointless.  Yes you could design using CA then hand-code you g-code but
> > then you loose the guarantee that the g-code follows the design because
> > there is an "air gap" in the work flow and it is VERY hard to make
> organic
> > looking shaps with hand made g-code.
> >
> > My criteria for choosing software is "Could I use it to make a battery
> > operated drill with the over-molded rounded case that fits your hand.
> > Fusion360, even the free version would allow this if you split the case
> > laterally to make to halves that assemble together.You couldn't use
> the
> > free Fusion for a one-piece model of a drill because to mill that you'd
> > need at least 4 axis
> >
> > If you do need better CAM to run a more complex machine tool and you are
> on
> > a limited budget.   There is a way to get SolidWorks at no cost if you
> are
> > an EAA member.  SoldWorks is the only other CAD I know of that includes
> CAM
> > and can be had for zero or very low cost.
> >
> > On Tue, Feb 2, 2021 at 10:18 AM R C  wrote:
> >
> >> Hello,
> >>
> >>
> >> I have been busy for a while with that pay check thing, and didn't have
> >> much time to look into  creating g-code, that I can use  in linux cnc
> >> for a lathe.
> >>
> >>
> >> Is there anything "new" yet?  I was thinking about using fusion360,  but
> >> I heard that is on it's way out for even a reasonable hobby priced
> license
> >>
> >>
> >> are there any alternatives?
> >>
> >>
> >> I found this video, and was wondering how well this works, has anyone
> >> done this?
> >>
> >>
> >> https://www.youtube.com/watch?v=cuimIOZcty8
> >>
> >>
> >>
> >> ___
> >> Emc-users mailing list
> >> Emc-users@lists.sourceforge.net
> >> https://lists.sourceforge.net/lists/listinfo/emc-users
> >>
> >
>
>
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>


-- 

Chris Albertson
Redondo Beach, California

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Re: [Emc-users] lathe paths with linux cnc and CAD software

[Dave Matthews]

On Tue, Feb 2, 2021 at 2:44 PM R C  wrote:

> Hi Chris,
>
> well, I am only looking into something different for making some parts
> on a lathe,  I looked at fusion360, but what I hear is that you can't
> 'export' projects, or import, and also you can only have a few.  Not
> that I do a lot of work, but it seems to be a hassle.
>
>
You heard wrong.  You can import/export in a few formats and the project
limit is for active projects.  Basically click to archive one and click
again to make an archived one active.  I think the limit is 10 active.

Dave

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Re: [Emc-users] lathe paths with linux cnc and CAD software

[Mark Wendt]

He's asking about for software for a lathe, not a mill.

Mark

On Tue, Feb 2, 2021 at 2:33 PM Chris Albertson 
wrote:

> The free Fusion360 license allows 2 and 3-axis milling, adaptive clearing,
> and turning.   This is likely enough for most people.
>
> What you can't do is 4-axis and 5-axis milling.  To enable that you do have
> to pay for a license
>
> more info here: https://www.autodesk.com/products/fusion-360/personal
>
> The other CAD options completely lack any build-in CAM functions.  So it is
> pointless.  Yes you could design using CA then hand-code you g-code but
> then you loose the guarantee that the g-code follows the design because
> there is an "air gap" in the work flow and it is VERY hard to make organic
> looking shaps with hand made g-code.
>
> My criteria for choosing software is "Could I use it to make a battery
> operated drill with the over-molded rounded case that fits your hand.
> Fusion360, even the free version would allow this if you split the case
> laterally to make to halves that assemble together.You couldn't use the
> free Fusion for a one-piece model of a drill because to mill that you'd
> need at least 4 axis
>
> If you do need better CAM to run a more complex machine tool and you are on
> a limited budget.   There is a way to get SolidWorks at no cost if you are
> an EAA member.  SoldWorks is the only other CAD I know of that includes CAM
> and can be had for zero or very low cost.
>
> On Tue, Feb 2, 2021 at 10:18 AM R C  wrote:
>
> > Hello,
> >
> >
> > I have been busy for a while with that pay check thing, and didn't have
> > much time to look into  creating g-code, that I can use  in linux cnc
> > for a lathe.
> >
> >
> > Is there anything "new" yet?  I was thinking about using fusion360,  but
> > I heard that is on it's way out for even a reasonable hobby priced
> license
> >
> >
> > are there any alternatives?
> >
> >
> > I found this video, and was wondering how well this works, has anyone
> > done this?
> >
> >
> > https://www.youtube.com/watch?v=cuimIOZcty8
>

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Re: [Emc-users] lathe paths with linux cnc and CAD software

[R C]

Hi Chris,

well, I am only looking into something different for making some parts 
on a lathe,  I looked at fusion360, but what I hear is that you can't  
'export' projects, or import, and also you can only have a few.  Not 
that I do a lot of work, but it seems to be a hassle.


I have a sherline (rebranded to Paxton/Patterson mill, so that is 3 axis 
as for now).


I use freecad for the mill, and that's more than I'd need already.  I 
was suprised that it doesn't generate code for lathes (although, I have 
the impression that people have been working on it, but not seen 
something really yet.  (also I mght not know enough about machining, to 
understand why it is difficult to create something for a lathe, but not 
for a mill?)



There's that  gentleman here that has some modules with an interface 
(sorry man forgot your name), but somehow I never got that to work in 
linux cnc. (No movement, maybe I did get parameters wrong, maybe not 
setup right, dunno)


So I am still looking, it is fairly easy for me to make thing is freecad,


Also, I don't have a "professional machine shop" so I am not looking to 
spent significant amounts on software.



Ron



On 2/2/21 12:30 PM, Chris Albertson wrote:

The free Fusion360 license allows 2 and 3-axis milling, adaptive clearing,
and turning.   This is likely enough for most people.

What you can't do is 4-axis and 5-axis milling.  To enable that you do have
to pay for a license

more info here: https://www.autodesk.com/products/fusion-360/personal

The other CAD options completely lack any build-in CAM functions.  So it is
pointless.  Yes you could design using CA then hand-code you g-code but
then you loose the guarantee that the g-code follows the design because
there is an "air gap" in the work flow and it is VERY hard to make organic
looking shaps with hand made g-code.

My criteria for choosing software is "Could I use it to make a battery
operated drill with the over-molded rounded case that fits your hand.
Fusion360, even the free version would allow this if you split the case
laterally to make to halves that assemble together.You couldn't use the
free Fusion for a one-piece model of a drill because to mill that you'd
need at least 4 axis

If you do need better CAM to run a more complex machine tool and you are on
a limited budget.   There is a way to get SolidWorks at no cost if you are
an EAA member.  SoldWorks is the only other CAD I know of that includes CAM
and can be had for zero or very low cost.

On Tue, Feb 2, 2021 at 10:18 AM R C  wrote:


Hello,


I have been busy for a while with that pay check thing, and didn't have
much time to look into  creating g-code, that I can use  in linux cnc
for a lathe.


Is there anything "new" yet?  I was thinking about using fusion360,  but
I heard that is on it's way out for even a reasonable hobby priced license


are there any alternatives?


I found this video, and was wondering how well this works, has anyone
done this?


https://www.youtube.com/watch?v=cuimIOZcty8



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Re: [Emc-users] lathe paths with linux cnc and CAD software

[Chris Albertson]

The free Fusion360 license allows 2 and 3-axis milling, adaptive clearing,
and turning.   This is likely enough for most people.

What you can't do is 4-axis and 5-axis milling.  To enable that you do have
to pay for a license

more info here: https://www.autodesk.com/products/fusion-360/personal

The other CAD options completely lack any build-in CAM functions.  So it is
pointless.  Yes you could design using CA then hand-code you g-code but
then you loose the guarantee that the g-code follows the design because
there is an "air gap" in the work flow and it is VERY hard to make organic
looking shaps with hand made g-code.

My criteria for choosing software is "Could I use it to make a battery
operated drill with the over-molded rounded case that fits your hand.
Fusion360, even the free version would allow this if you split the case
laterally to make to halves that assemble together.You couldn't use the
free Fusion for a one-piece model of a drill because to mill that you'd
need at least 4 axis

If you do need better CAM to run a more complex machine tool and you are on
a limited budget.   There is a way to get SolidWorks at no cost if you are
an EAA member.  SoldWorks is the only other CAD I know of that includes CAM
and can be had for zero or very low cost.

On Tue, Feb 2, 2021 at 10:18 AM R C  wrote:

> Hello,
>
>
> I have been busy for a while with that pay check thing, and didn't have
> much time to look into  creating g-code, that I can use  in linux cnc
> for a lathe.
>
>
> Is there anything "new" yet?  I was thinking about using fusion360,  but
> I heard that is on it's way out for even a reasonable hobby priced license
>
>
> are there any alternatives?
>
>
> I found this video, and was wondering how well this works, has anyone
> done this?
>
>
> https://www.youtube.com/watch?v=cuimIOZcty8
>
>
>
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-- 

Chris Albertson
Redondo Beach, California

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Re: [Emc-users] To Sam Sokolik re opencv on linux

[Gene Heskett]

On Sunday 31 January 2021 16:03:55 Sam Sokolik wrote:

> Ok.  I found the config/python script I was working on...  Late 2014..
> Boy.  I will put them up somewhere tonight..
>
Fooling around, trying to make it work with modern language, the first 
thing I run into seems to be a missing file:

(gladevcp:20792): libglade-WARNING **: could not find glade file 
'probe_icons/probe_screen.glade'
 GLADE VCP ERROR:With xml file: probe_icons/probe_screen.glade : could 
not create GladeXML object
:0: gladevcp exited without becoming ready

Any chance that can be found?

Thanks Sam

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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[Emc-users] lathe paths with linux cnc and CAD software

[R C]

Hello,


I have been busy for a while with that pay check thing, and didn't have 
much time to look into  creating g-code, that I can use  in linux cnc 
for a lathe.



Is there anything "new" yet?  I was thinking about using fusion360,  but 
I heard that is on it's way out for even a reasonable hobby priced license



are there any alternatives?


I found this video, and was wondering how well this works, has anyone 
done this?



https://www.youtube.com/watch?v=cuimIOZcty8



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Re: [Emc-users] Sheet metal operations.

[John Dammeyer]

> From: andy pugh [mailto:bodge...@gmail.com]
> On Mon, 1 Feb 2021 at 21:49, John Dammeyer  wrote:
> 
> > Anyway the plan was to at some time create an ELS controlled movable back 
> > fence for the 3:1 tool and an XY movement system for
> the Arbor press to give me limited punching capabilities like the attached 
> picture.
> 
> I have thought that this would be a good thing to have if I ever get
> round to making a CNC slotting head for my milling machine (Or if I
> find an OEM one for the mill at a reasonable price[1])
> 
What's a CNC slotting head?

> Have you seen the Trumpf CNC punches? Fascinating machines:
> https://youtu.be/-xOR42xho9I
> 
Yes. I've seen similar machines in real life punching the back plate of my ELS 
kit.  Alas that company isn't there anymore.  

> I think that one limitation of such a device would be throat depth.
> The Trumpf machines have a huge one.

True.  The photo I attached was of a arbor press with a much deeper throat.  
The limitation ultimately is the size of the box foldable by either a box pan 
brake (say 12") or the 3:1 tool which in my case is 30" but they do come 
smaller.So punching half and then rotating the material by 180 degrees and 
punching the other half does effectively double the depth.

If it came down to needing something larger it could always be fabricated.

John




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

[Gene Heskett]

On Tuesday 02 February 2021 08:30:56 Sam Sokolik wrote:

> I have looked at cycloidal drives and feel that they have too many
> parts :)
>
> Gene
> https://www.youtube.com/watch?v=Gx263nnTrqY
>
> Ran for over 6 hours like that - about 850rpm input.
>
I am highly impressed.

Now finish the housing, and hang a load on it, like the worm of a BS-1 
while making another worm to replace the crappy worm in the Chinese 
BS-1. That worm is doomed to a higher wear rate, a fact I'm becoming 
aware of as I exercise this BS-1 servo for tuning. 

That is why I bought the ender3, but I was using O.P's code which was 
crappy code IMO. Turns out the ender3 can make stuff a heck of a lot 
better that the code I could DL from thingiverse. I now have the 
extruder motor on the x carriage, moving a modified stock hot end, and 
while its slower than some because the heating is only once the filament 
is in the nozzle, dozens of times more dependable than the stock setup. 
No clogging from cold filament because the hot stuff backs up into the 
heat sink and freezes.

I think this loose ring idea has the most promise of making a long 
lasting drive, and shorter axially than any design so far. Please 
continue.

Thank you Sam S.

> On Thu, Jan 28, 2021 at 3:13 AM andrew beck 
>
> wrote:
> > Guys just to chime in here.
> >
> > Sam went don't you design a cycloidal drive instead.  They are easy
> > to make on a normal 3 axis Cnc mill with a end mill and much more
> > rigid than a harmonic drive.  As they are not so fragile.  I'm
> > planning on making some on my VMC soon.I don't understand why
> > use a harmonic drive.  (I actually have a big harmonic drive here
> > from a robot. )
> >
> > On Thu, 28 Jan 2021, 18:53 Bari,  wrote:
> > > 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
> > >
> > >
> > >
> > > ___
> > > 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
>
> ___
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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?

[Sam Sokolik]

I have looked at cycloidal drives and feel that they have too many parts :)

Gene
https://www.youtube.com/watch?v=Gx263nnTrqY

Ran for over 6 hours like that - about 850rpm input.


On Thu, Jan 28, 2021 at 3:13 AM andrew beck 
wrote:

> Guys just to chime in here.
>
> Sam went don't you design a cycloidal drive instead.  They are easy to make
> on a normal 3 axis Cnc mill with a end mill and much more rigid than a
> harmonic drive.  As they are not so fragile.  I'm planning on making some
> on my VMC soon.I don't understand why use a harmonic drive.  (I
> actually have a big harmonic drive here from a robot. )
>
> On Thu, 28 Jan 2021, 18:53 Bari,  wrote:
>
> > 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
> >
> >
> >
> > ___
> > 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
>

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Re: [Emc-users] Sheet metal operations.

[andy pugh]

On Tue, 2 Feb 2021 at 10:14,  wrote:

> http://www.metalsmith.co.uk/rivet-embossing-tool.htm

For real rivets I made:
http://bodgesoc.blogspot.com/2014/04/hydraulicrivetsqueezer.html

-- 
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] Sheet metal operations.

[andy pugh]

On Mon, 1 Feb 2021 at 21:49, John Dammeyer  wrote:

> Anyway the plan was to at some time create an ELS controlled movable back 
> fence for the 3:1 tool and an XY movement system for the Arbor press to give 
> me limited punching capabilities like the attached picture.

I have thought that this would be a good thing to have if I ever get
round to making a CNC slotting head for my milling machine (Or if I
find an OEM one for the mill at a reasonable price[1])

Have you seen the Trumpf CNC punches? Fascinating machines:
https://youtu.be/-xOR42xho9I

I think that one limitation of such a device would be throat depth.
The Trumpf machines have a huge one.

There is probably value in mounting a linear rail to the bench in
front of the arbor press and then mounting a couple of switchable
magnets to the sliders just to manually move sheets in straight lines.
(would probably work with think aluminium with a steel bar on top)

Which reminds me of another fascinating sheet metal tool.
https://youtu.be/OipSiPSRti8
The inventor has, rather generously, written a web page on how to make your own.
http://aaybee.com.au/Magnabend/Building%20Your%20Own%20Magnabend.html
I have had a small amount of success improvising a similar arrangement
with my mag-base drill.

[1] Quite a fluid concept. The last time one came up it was £300 and
far too expensive. If I saw one now at that price I would snap it up)
-- 
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] Sheet metal operations.

[marcus . bowman]

On 2021-02-01 21:47, John Dammeyer wrote:



What I'm wondering is if it's worth the trouble to add XY to a 3 ton
arbour press.  The back fence for the 3:1 tool is almost done so it's
just a matter of finishing it.  But I can't see how any of the CAD/CAM
software out there addresses using a small punch to nibble out a
larger hole.  And truthfully my JGRO based CNC router with a small end
mill can just as easily cut out metal plate.  Or for that matter the
mill.
But is an XY punch even worth the effort?


This is a project I, too, have had echoing around the inside of my head 
for a long time. I have a flypress and a small 2 ton arbour press.  One 
application I can see that could be significantly improved by adding an 
XY capability would be for pressing sheet metal to create dummy rivets, 
for scale model locomotives. That is not punching through, but punching 
to form a protrusion. There are some hand-operated machines for doing 
that, and they offers a guide to assist in manually slipping the metal 
into position.

http://www.metalsmith.co.uk/rivet-embossing-tool.htm
http://www.modelrailroading.nl/news%20articles/tools/pages/rivet%20press.htm
and the highly regarded, but no longer available, GW Models press which 
has some XY manual positioning adjustment:

https://picclick.co.uk/GW-Models-Universal-Rivet-Press-tool-173452688000.html
Personally, this seems to me like a job crying out for a decent CNC XY 
positioning system.
Add a controllable-depth Z axis capable of exerting modest pressure, and 
you would be able to enter lists of co-ordinates and press 
pre-determined patterns of rivets with ease.
Add a simple piercing punch and a bit more power and you would be able 
to punch the holes for actual rivets.
You could always try using a powered toggle press, as they are designed 
for this kind of task.Big and heavy, though.
A flypress might be a possibility, if you devised a mechanism for 
turning the shaft (easy) then pulling it (reverse rotation) smartly as 
though you were vigorously swinging the arm/handle. Moving the weight at 
speed produces the force.


Or create a jig for holding the sheet, and use a conventional CNC mill, 
with the addition of an arrangement for pressing or punching, and you 
would have the same thing. easy for thin brass, but not quite so 
straight forward where large forces are required on the Z axis.


Sounds like a useful project to me, whichever way you go.

Marcus


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