Re: [Emc-users] Encoders

[Gene Heskett]

On Thursday 31 May 2018 21:58:49 jeremy youngs wrote:

> On Thu, May 31, 2018, 19:39 Gene Heskett  wrote:
> > On Thursday 31 May 2018 19:45:24 jeremy youngs wrote:
> > > Encoders in hand, shaft turned and mounted, it looks good, 3 more
> > > to do . encoderawcount.jpg
> > >  > >/vie w?usp=drivesdk>
> >
> > That does look pretty good at first glance. I can't read the
> > clocking rate though. Humm, I just found the viewer has a zoom. So I
> > assume you were turning it by hand as the timing shows 2/1
> > variations on a 10
>
> Back emf , as measured in lathe at 800 rpm was 21.6 volts. It's a 20
> volt motor , I intend on driving at 28 volts with generic hbridge. I'm
> not sure that 28 will give the 300 ipm rapid I'm after, but time will
> tell. I was powering this with a 700 ma 5 volt supply so motor speed
> was pretty slow, I did not put my tach on it , encoders are set to
> 1000 PPR as that's what I already have the 7i 90 programmed to. 20/56
> is the timing pulley ratio so that will be over 2k per rev. I hope to
> ballscrew the x in the next month or so , y and z are already
> ballscrew although I think I am going to replace the y screw ( again)
> as it's a surplus screw and I don't like it's mount and have been
> fairly impressed with the Chinese screw I put in z.
>
>
>
>
> millisecond per grid line, so thats pretty slow. What it looks like at
> 3
>
> > to 5k revs will tell the story.
>
> I'm pretty sure 2k will be the absolute max with my setup.
>
>
> But you are not going to get that
>
> > display at 3 to 5k in halscope. That will need a good scope,
> >
> > On the list, but concrete and shop expansion are essential at this
> > time . I wrench to support my Machine habit 
> >
Humm, there's a quite similar echo in here, except I'm now retired for 
about 16 years.  So I wrench to keep me out of the bars. Actually dead 
tired tonight, taking care of the missus. We've decided to leave town 
next February, so maybe she won't fall and break something 3 years in a 
row. Went in for some xrays to see how the leg is healed, looks great. 
Now it needs meat. I've got to tie her down when the wind comes up.  But 
COPD never lets up and this ultra humid weather isn't doing that any 
good at all.

I did get 2 more tap hats completed this morning though, 15 done now. 
About 30 & change to go.  Now using some of those I've already made, 
after making my code automatically adjust for tool length, I spend more 
time finding the correct drill sizes (and sharpening them in a drill 
doctor) than in the actual machining.

-- 
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--
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Re: [Emc-users] Encoders

[jeremy youngs]

On Thu, May 31, 2018, 19:39 Gene Heskett  wrote:

> On Thursday 31 May 2018 19:45:24 jeremy youngs wrote:
>
> > Encoders in hand, shaft turned and mounted, it looks good, 3 more to
> > do . encoderawcount.jpg
> >  >w?usp=drivesdk>
>
> That does look pretty good at first glance. I can't read the clocking
> rate though. Humm, I just found the viewer has a zoom. So I assume you
> were turning it by hand as the timing shows 2/1 variations on a 10
>

Back emf , as measured in lathe at 800 rpm was 21.6 volts. It's a 20 volt
motor , I intend on driving at 28 volts with generic hbridge. I'm not sure
that 28 will give the 300 ipm rapid I'm after, but time will tell. I was
powering this with a 700 ma 5 volt supply so motor speed was pretty slow, I
did not put my tach on it , encoders are set to 1000 PPR as that's what I
already have the 7i 90 programmed to. 20/56 is the timing pulley ratio so
that will be over 2k per rev. I hope to ballscrew the x in the next month
or so , y and z are already ballscrew although I think I am going to
replace the y screw ( again) as it's a surplus screw and I don't like it's
mount and have been fairly impressed with the Chinese screw I put in z.




millisecond per grid line, so thats pretty slow. What it looks like at 3
> to 5k revs will tell the story.

I'm pretty sure 2k will be the absolute max with my setup.


But you are not going to get that
> display at 3 to 5k in halscope. That will need a good scope,
>
> On the list, but concrete and shop expansion are essential at this time .
> I wrench to support my Machine habit 
>
> > --
> > Check out the vibrant tech community on one of the world's
> > most engaging tech sites, Slashdot.org! http://sdm.link/slashdot
> > ___
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> > https://lists.sourceforge.net/lists/listinfo/emc-users
>
>
>
> --
> 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 
>
>
> --
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Re: [Emc-users] New SoC

[Gene Heskett]

On Thursday 31 May 2018 20:51:42 bari wrote:

> https://www.phoronix.com/scan.php?page=news_item=Linux-4.17-Might-H
>ave-iMX8
>
> Not in mainline yet (kernel.org) and will be preempt_rt obviously.
>
> This double dog dare is targeted at those a few bananas above your pay
> grade  :)
>
Shush now, not so loud. :)

> On 05/31/2018 07:28 PM, Gene Heskett wrote:
> > And what about support? As in a
> > realtime linux kernel?
>
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--
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 soap, ballot, jury, and ammo. Please use in that order."
-Ed Howdershelt (Author)
Genes Web page 

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Re: [Emc-users] New SoC

[bari]

https://www.phoronix.com/scan.php?page=news_item=Linux-4.17-Might-Have-iMX8

Not in mainline yet (kernel.org) and will be preempt_rt obviously.

This double dog dare is targeted at those a few bananas above your pay
grade  :)

On 05/31/2018 07:28 PM, Gene Heskett wrote:
> And what about support? As in a 
> realtime linux kernel?


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Re: [Emc-users] Encoders

[Gene Heskett]

On Thursday 31 May 2018 19:45:24 jeremy youngs wrote:

> Encoders in hand, shaft turned and mounted, it looks good, 3 more to
> do . encoderawcount.jpg
> w?usp=drivesdk>

That does look pretty good at first glance. I can't read the clocking 
rate though. Humm, I just found the viewer has a zoom. So I assume you 
were turning it by hand as the timing shows 2/1 variations on a 10 
millisecond per grid line, so thats pretty slow. What it looks like at 3 
to 5k revs will tell the story. But you are not going to get that 
display at 3 to 5k in halscope. That will need a good scope,

> --
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> most engaging tech sites, Slashdot.org! http://sdm.link/slashdot
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--
"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 

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Re: [Emc-users] New SoC

[Gene Heskett]

On Thursday 31 May 2018 18:35:52 bari wrote:

> I double dog dare anyone to Linuxcnc this  :)
>
> https://www.nxp.com/products/processors-and-microcontrollers/applicati
>ons-processors/i.mx-applications-processors/i.mx-8-processors/i.mx-8-fa
>mily-arm-cortex-a53-cortex-a72-virtualization-vision-3d-graphics-4k-vid
>eo:i.MX8
>
No hint of the pricing that I could find. And what about support? As in a 
realtime linux kernel?

Haveing been burned by pine with the rock64, thinking it was the pi 
killer it could be, and the rock64 has a hell of a good pedigree, fixing 
or just plain bypassing all the pi's i/o bottlenecks, but zero support, 
I am understandably gun shy.

>     Core Complex #1: 4x Arm® Cortex®-A53
>     Core Complex #2: 2x Arm® Cortex®-A72
>     2x Arm Cortex-M4F
>     1x HIFI4 DSP
>
> So like the BeagleBoneBlack (BBB) it has high speed ARM cores for real
> and non-real time plus 2x micro-controllers for integrated stepping
> (no FPGA required) and unlike the BBB includes an integrated GPU with
> open source drivers that can support HD resolutions at >30fps.
>
> It also has 2x integrated NIC's for networking and Ethernet controlled
> servos.
>
> 2x PCIe 3.0 (2-lane or 2x 1-lane)
>
> 1x FPGA interface (QuadSPI)
>
> LPDDR4 or DDR4 and bunch of other IO and A/D, D/A.
>
> https://www.nxp.com/docs/en/fact-sheet/IMX8FAMFS.pdf
>
> On 05/31/2018 10:54 AM, andy pugh wrote:
> > Possibly Useful for LinuxCNC, but equally possibly too expensive.
> > https://www.kickstarter.com/projects/udoo/udoo-bolt-raising-the-make
> >r-world-to-the-next-leve?ref=20ae5a
> >
> > I bought one of the original UDOO boards but never got round to
> > doing much more than building a Xenomai (I think) kernel.
> >
> > I think lost interest when I found a USB bridge between the Arduno
> > IO and the Linux OS. But it was a while ago and I am fuzzy on the
> > details.
>
> --
> Check out the vibrant tech community on one of the world's
> most engaging tech sites, Slashdot.org! http://sdm.link/slashdot
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-- 
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--
"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 

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Re: [Emc-users] Encoders

[jeremy youngs]

A,b and index. I'm beat for the day , I will follow up tomorrow, been
really busy in shop, beginning an ls swap and restoration of an 83 3/4 ton
Chevy for a customer. That will limit my ability to get this done , but
will provide much needed funds.

Also, I won the bid on that 6 horse bldc 37 NM motor, I will have questions
> about that when the brown dude drops it off.
>

Also I had the horizontal zoom up Fairly high, don't know if that makes a
difference. Can you post a pic of a good waveform please ?

>
>
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Re: [Emc-users] Encoders

[andy pugh]

On 1 June 2018 at 00:45, jeremy youngs  wrote:
> Encoders in hand, shaft turned and mounted, it looks good, 3 more to do .
>   encoderawcount.jpg
> 

Is that with only one channel connected? Rawcounts should increase,
not go 1,0,1,0


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

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Re: [Emc-users] Encoders

[jeremy youngs]

Encoders in hand, shaft turned and mounted, it looks good, 3 more to do .
  encoderawcount.jpg

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Re: [Emc-users] New SoC

[bari]

I double dog dare anyone to Linuxcnc this  :)

https://www.nxp.com/products/processors-and-microcontrollers/applications-processors/i.mx-applications-processors/i.mx-8-processors/i.mx-8-family-arm-cortex-a53-cortex-a72-virtualization-vision-3d-graphics-4k-video:i.MX8

    Core Complex #1: 4x Arm® Cortex®-A53
    Core Complex #2: 2x Arm® Cortex®-A72
    2x Arm Cortex-M4F
    1x HIFI4 DSP

So like the BeagleBoneBlack (BBB) it has high speed ARM cores for real
and non-real time plus 2x micro-controllers for integrated stepping (no
FPGA required) and unlike the BBB includes an integrated GPU with open
source drivers that can support HD resolutions at >30fps.

It also has 2x integrated NIC's for networking and Ethernet controlled
servos.

2x PCIe 3.0 (2-lane or 2x 1-lane)

1x FPGA interface (QuadSPI)

LPDDR4 or DDR4 and bunch of other IO and A/D, D/A.

https://www.nxp.com/docs/en/fact-sheet/IMX8FAMFS.pdf

On 05/31/2018 10:54 AM, andy pugh wrote:
> Possibly Useful for LinuxCNC, but equally possibly too expensive.
> https://www.kickstarter.com/projects/udoo/udoo-bolt-raising-the-maker-world-to-the-next-leve?ref=20ae5a
>
> I bought one of the original UDOO boards but never got round to doing
> much more than building a Xenomai (I think) kernel.
>
> I think lost interest when I found a USB bridge between the Arduno IO
> and the Linux OS. But it was a while ago and I am fuzzy on the
> details.
>


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Re: [Emc-users] OT: machine geometry

[Stuart Stevenson]

At an auction here in Wichita one of these (a different brand) sold for
about USD4000.00 a couple months ago. The guy told the auctioneer's office
he would have paid more than USD40,000.00 for the machine. He felt he got a
steal. There are a couple dental labs here in town. I almost went but all I
would have accomplished would have been to force the guy to pay more for
the machine as I would not have paid anywhere near USD40,000.00.

The reviews on the website extol the virtue of accurate dimensions and
finishes. I think the geometry allows very good step over blending that
yields almost no polishing to achieve the required finish. When the tool is
almost stationary and the rotary axes rotate around the center point you
get almost no sine/cosine (rotary) error in the blend.

The Bostomatic 5 axis machines were similar in design concept. Put the Z on
the A allowing the tool length offset to position the tool tip at the
center of rotation of the A axis.






On Thu, May 31, 2018 at 4:48 PM, andy pugh  wrote:

> On 31 May 2018 at 22:45, Chris Albertson 
> wrote:
>
> > Also they say the design eliminates the need to fixtures.  The part can
> be
> > clamped on one edge then milled and drilled from any angle without having
> > to unclamp and manually flip the part.
>
> Yes, but that is true of any 5 axis machine, look at the PocketNC for
> an example.
>
> --
> atp
> "A motorcycle is a bicycle with a pandemonium attachment and is
> designed for the especial use of mechanical geniuses, daredevils and
> lunatics."
> — George Fitch, Atlanta Constitution Newspaper, 1916
>
> 
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Re: [Emc-users] OT: machine geometry

[andy pugh]

On 31 May 2018 at 22:45, Chris Albertson  wrote:

> Also they say the design eliminates the need to fixtures.  The part can be
> clamped on one edge then milled and drilled from any angle without having
> to unclamp and manually flip the part.

Yes, but that is true of any 5 axis machine, look at the PocketNC for
an example.

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

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Re: [Emc-users] OT: machine geometry

[Chris Albertson]

I found the manufacturer's web site
http://www.cybamantech.co.uk/en/products/milling_machines/cybaman_replicator

The milling machine comes in both 5 and 6 axis versions.   You ask why this
is different from other 5-axis mills.  Likely so as to make it possible to
add the 6th axis without need to re-design everything.

Also they say the design eliminates the need to fixtures.  The part can be
clamped on one edge then milled and drilled from any angle without having
to unclamp and manually flip the part.


On Thu, May 31, 2018 at 9:05 AM, Roland Jollivet 
wrote:

> I saw this machine style for the first time, so I thought I'd share.
> There's a few videos, but they don't concentrate on showing the motion
> range.
> Here are two;
>
> https://www.youtube.com/watch?v=gvJmIP4OCIE
>
>
> https://www.youtube.com/watch?v=uCDsWHAF2BU
>
>
> The machine/ company is here;
> http://www.cybamantech.co.uk/en/products/milling_machines/
> cybaman_replicator
> 
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Re: [Emc-users] New SoC

[jeremy youngs]

On Thu, May 31, 2018, 10:55 andy pugh  wrote:

> Possibly Useful for LinuxCNC, but equally possibly too expensive.
>
> https://www.kickstarter.com/projects/udoo/udoo-bolt-raising-the-maker-world-to-the-next-leve?ref=20ae5a
>
> I bought one of the original UDOO boards but never got round to doing
> much more than building a Xenomai (I think) kernel.
>
> I think lost interest when I found a USB bridge between the Arduno IO
> and the Linux OS. But it was a while ago and I am fuzzy on the
> details.
>
> --
> If something like this were available with a user configurable fpga on top
> of it , and a just works distro it would be well worth $400. It seems
> limited on io but impressively powerful and very low power consumption.
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Re: [Emc-users] OT: machine geometry

[andy pugh]

On 31 May 2018 at 17:05, Roland Jollivet  wrote:

> https://www.youtube.com/watch?v=gvJmIP4OCIE

I wonder what the advantage is over a more conventional 5-axis?

-- 
atp
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designed for the especial use of mechanical geniuses, daredevils and
lunatics."
— George Fitch, Atlanta Constitution Newspaper, 1916

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[Emc-users] OT: machine geometry

[Roland Jollivet]

I saw this machine style for the first time, so I thought I'd share.
There's a few videos, but they don't concentrate on showing the motion
range.
Here are two;

https://www.youtube.com/watch?v=gvJmIP4OCIE


https://www.youtube.com/watch?v=uCDsWHAF2BU


The machine/ company is here;
http://www.cybamantech.co.uk/en/products/milling_machines/cybaman_replicator
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[Emc-users] New SoC

[andy pugh]

Possibly Useful for LinuxCNC, but equally possibly too expensive.
https://www.kickstarter.com/projects/udoo/udoo-bolt-raising-the-maker-world-to-the-next-leve?ref=20ae5a

I bought one of the original UDOO boards but never got round to doing
much more than building a Xenomai (I think) kernel.

I think lost interest when I found a USB bridge between the Arduno IO
and the Linux OS. But it was a while ago and I am fuzzy on the
details.

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

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