Re: [Emc-users] Hardinge CHNC-I

[Jon Elson]

On 02/28/2018 12:56 PM, Ed wrote:



Some have 5C others have 16C.

Generally the 5C machines have a threaded spindle nose, 
mine has the 16C with and A2-5 nose.


Thanks much!  This one seems to be the A2-5, it has an 
external taper that reminds me of a D1-type
spindle.  The guy looking to buy is going to inspect it on 
Friday. I'll tell him to measure a bunch of stuff.


Jon

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Re: [Emc-users] Hardinge CHNC-I

[Ed]

On 02/28/2018 10:55 AM, Jon Elson wrote:
I know a number of you guys have Hardinge HNC and CHNC machines 
retrofitted with LinuxCNC.


I have a friend/customer local to me who needs a CNC lathe that can 
crank out aluminum parts 1.5" in diameter.  There's a CHNC-I 
relatively local to us that is going pretty cheaply.


Can anybody tell me a few tidbits about the CHNC-I?  Do 16C collets 
fit directly into the spindle, or need some kind of plate to fit 
them?  It does have the air collet closer on the back of the spindle.



Some have 5C others have 16C.

Generally the 5C machines have a threaded spindle nose, mine has the 16C 
with and A2-5 nose.







This one has the General Numerics control on it, so that dates it as 
one of the early ones.
Is the spindle DC or AC?  What is the likelyhood of the spindle drive 
still working?  It is a 460 V machine,
if the spindle is AC, can the motor be rewired for 240 V?  (If it can, 
then coming up with a 240 V VFD would be totally simple.  If DC, then 
a big DC servo drive could get expensive.)



At 480V it may be AC.
Mine was DC with a big ugly drive and weird voltages. I made a bearing 
holder with shaft ( kind of a jack shaft ) to replace it and mounted  an 
AC motor below it driven from a VFD





I seem to remember these machines might have resolvers, but maybe that 
was just the VERY old HNC with the GE control.



Yes on the resolvers on older machines, mine is a 1978 model. Converted 
to encoders.






I'm not familiar with the tooling required on the tool turret, what is 
it called and where would you get it from?



Depends on which height  tooling plate you have. Measure from the top of 
the plate to the center of the spindle. The common heights are 3/8" and 
1/2".
I made a set of blocks that clamp to the turret plate and bored them in 
place so I could use standard boring bars for tooling along with a 
couple of Hardinge holders. A left hand boring bar becomes an external 
turning tool, threading also works that way.






Thanks much for any info on this!

Jon

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[Emc-users] Hardinge CHNC-I

[Jon Elson]

I know a number of you guys have Hardinge HNC and CHNC 
machines retrofitted with LinuxCNC.


I have a friend/customer local to me who needs a CNC lathe 
that can crank out aluminum parts 1.5" in diameter.  There's 
a CHNC-I relatively local to us that is going pretty cheaply.


Can anybody tell me a few tidbits about the CHNC-I?  Do 16C 
collets fit directly into the spindle, or need some kind of 
plate to fit them?  It does have the air collet closer on 
the back of the spindle.


This one has the General Numerics control on it, so that 
dates it as one of the early ones.
Is the spindle DC or AC?  What is the likelyhood of the 
spindle drive still working?  It is a 460 V machine,
if the spindle is AC, can the motor be rewired for 240 V?  
(If it can, then coming up with a 240 V VFD would be totally 
simple.  If DC, then a big DC servo drive could get expensive.)


I seem to remember these machines might have resolvers, but 
maybe that was just the VERY old HNC with the GE control.


I'm not familiar with the tooling required on the tool 
turret, what is it called and where would you get it from?


Thanks much for any info on this!

Jon

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Re: [Emc-users] non-contact position sensors, surprisingly good performance.

[Gene Heskett]

On Wednesday 28 February 2018 10:04:38 Gene Heskett wrote:

> On Wednesday 28 February 2018 07:03:42 andy pugh wrote:
> > On 28 February 2018 at 01:15, Gene Heskett 
>
> wrote:
> > > So I am supposed to get a fitbit, and let it yelp
> > > at me every so often. So I did, then discovered it only runs on
> > > winderz or Macs.  Its all packed up, never powered up, get my
> > > money back until its private, and runs on linux.
> >
> > https://linuxaria.com/article/how-to-sync-your-fitbit-under-linux
>
> Following those instructions, I get to the:
> gene@coyote:~/src/pyusb-master$ sudo pip install galileo
> Downloading/unpacking galileo
>   Cannot fetch index base URL http://pypi.python.org/simple/
>   Could not find any downloads that satisfy the requirement galileo
> No distributions at all found for galileo
> Storing complete log in /root/.pip/pip.log
>
> from the pip log in root:
> root@coyote:~/.pip# cat pip.log
> 
> /usr/bin/pip run on Wed Feb 28 09:57:11 2018
> Downloading/unpacking galileo
>
>   Getting page http://pypi.python.org/simple/galileo
>   Could not fetch URL http://pypi.python.org/simple/galileo: HTTP
> Error 403: SSL is required
>   Will skip URL http://pypi.python.org/simple/galileo when looking for
> download links for galileo
>   Getting page http://pypi.python.org/simple/
>   Could not fetch URL http://pypi.python.org/simple/: HTTP Error 403:
> SSL is required
>   Will skip URL http://pypi.python.org/simple/ when looking for
> download links for galileo
>   Cannot fetch index base URL http://pypi.python.org/simple/
>
> And from that it seems SSL is required. A considerable number of
> openssl files are installed. So whats next?

It turns out that galileo is not until stretch.

-- 
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] non-contact position sensors, surprisingly good performance.

[Gene Heskett]

On Wednesday 28 February 2018 07:03:42 andy pugh wrote:

> On 28 February 2018 at 01:15, Gene Heskett  
wrote:
> > So I am supposed to get a fitbit, and let it yelp
> > at me every so often. So I did, then discovered it only runs on
> > winderz or Macs.  Its all packed up, never powered up, get my money
> > back until its private, and runs on linux.
>
> https://linuxaria.com/article/how-to-sync-your-fitbit-under-linux

Following those instructions, I get to the:
gene@coyote:~/src/pyusb-master$ sudo pip install galileo
Downloading/unpacking galileo
  Cannot fetch index base URL http://pypi.python.org/simple/
  Could not find any downloads that satisfy the requirement galileo
No distributions at all found for galileo
Storing complete log in /root/.pip/pip.log

from the pip log in root:
root@coyote:~/.pip# cat pip.log

/usr/bin/pip run on Wed Feb 28 09:57:11 2018
Downloading/unpacking galileo

  Getting page http://pypi.python.org/simple/galileo
  Could not fetch URL http://pypi.python.org/simple/galileo: HTTP Error 
403: SSL is required
  Will skip URL http://pypi.python.org/simple/galileo when looking for 
download links for galileo
  Getting page http://pypi.python.org/simple/
  Could not fetch URL http://pypi.python.org/simple/: HTTP Error 403: SSL 
is required
  Will skip URL http://pypi.python.org/simple/ when looking for download 
links for galileo
  Cannot fetch index base URL http://pypi.python.org/simple/

And from that it seems SSL is required. A considerable number of openssl 
files are installed. So whats next?


-- 
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] Need to select a timing belt type and size

[Gene Heskett]

On Sunday 18 February 2018 20:17:06 Gene Heskett wrote:

> On Sunday 18 February 2018 18:53:59 Chris Albertson wrote:
> > Question:  What would be the preferred timing belt for a new design?
> >
> > Here is the application.  I'm making a z-axis control for a Harbor
> > Freight mini mill (Sieg X2).   In this design a 5/8 diameter, 0.200
> > pitch ball screw is fixed and the nut spins.  The nut is driven by a
> > timing belt "about" 50 teeth and the motor has an about 25 tooth
> > pulley.   I'm thinking a 400 in/oz. NEMA 23 stepper should work.
> > Assuming the 2:1 reduction each 1.8 degree step lifts the head
> > 0.0005 inches.  By 1/4 stepping I get 0.000125 per pulse.
> >
> > When looking for a good design for the mini mill I was looking for a
> > good place to put the ball screw.  This design places it very close
> > to the dove tail, almost touching it.  Maybe 0.1 inch in front of
> > the dovetail.  The ball screw goes right where the current rack it
> > the original design.  I will have to remove the rack to fit the
> > screw.
> >
> > So I need to select a belt type and size.   My initial guess at this
> > a the GT2, 3mm pitch and 9mm wide.
> >
> > Some one else used a XL type 3/8 wide and 0.2 pitch but I'm reading
> > that XL is not the best for new designs as GT2 has a much improved
> > both profile that eliminates backlash.

That was me, Gene, and in retrospect the GT2 is probably the better 
choice, as I have the belt tension right up to pretty hard on the motors 
bearings. Anything less and the backlash gets bad quickly. 17 teeth on 
the motor, 42 of the nut(s). nema 23 motor, double stack or around 270 
oz/in. With a damper of the rear of the motor, I can exceed 32 IPM on a 
10 tpi nook acme screw with only 28 volts to the motors. Mounted in 
front of the post, similar to what you've described but a little  
farther from the post.

Pix of my cobble job can be seen on my web page in the sig. Add emc to 
the base address or click on it. Pix 28 shows it moderately well.  A 3 
ft, 1.5x.250 strap was cut in two and made the stand above the post for 
the motor, a 3+ inch of 1/8th strap was bolted up the back long enough 
to get it welded, with a motor mount between the straps, and the whole 
thing bolted about 3x up each side to the post. Two tabs were welded on 
to project forward to hold the nuts bearings. Pix 33 shows it before 
mounting the motor or being installed on the post. The gearbox was 
turned 90 degrees to make room for the screw to pass and be bolted into 
the top of the sled casting. You can see the shopmade damper sticking up 
from the rear shaft of the motor in some of the pix.

Since those pix were taken, I have added a pair of 1/2" thick alu pieces 
around 7" long, with the center cut away, bolted to each side of the 
sled, carrying a skate bearing on the end to each "leg" to ride the face 
of the post, extending the effective wheelbase of the sled on the post 
by several inches, and as long as the post has a coat of vactra on it as 
I start the days use, all traces of stiction are gone. With that short a 
contact on the post, stiction is a huge problem, needing a dose of 
vactra (68) about every 30 minutes to even think about controlling it.

> > I started to calculate torque and load on the belt then thought "Why
> > bother?" the actual force is going to be whatever the motor can do
> > as I'll set the acceleration limits until it start skipping steps
> > then back up by about 30% or so.   I might go with a NEMA 34 1100
> > in/oz motor if I need to.  So I might choose a belt that can handle
> > whatever the 1100 in/oz motor can do.   Just looking to double check
> > GT2, 3mm pitch and 9mm wide is reasonable.
> >
> > So I guess the best way to ask the question is what kind of belts
> > are working well with motors in the 400 to 1100 in/oz. range.
> >
> > If there is any interest I'm modeling this in Fusion 360.  and can
> > share the CAD files
>
> Its been a while since I did my micromill, but ISTR I used the XL belt
> and its quite tight. Like you, I spin the nuts, doubled nook bronze
> ones, and my backlash stays below 3 thou. the screw is in front of the
> post by about 1/2 the distance between the post and the edge of the
> gearbox cover, which has been turned 90 degrees to get that clearance.
> the motor is an 8 wire good for a bit over 250 oz/in.  Works well. 
> you can see pix of it on my web page in the sig. The counter springing
> has been reworked a bit but the rest of the pix are still valid.
>
> Not a cad artist, so what you see came straight out of my head, quite
> a few years ago now. I write my own gcode.

-- 
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] non-contact position sensors, surprisingly good performance.

[andy pugh]

On 28 February 2018 at 01:15, Gene Heskett  wrote:

> So I am supposed to get a fitbit, and let it yelp
> at me every so often. So I did, then discovered it only runs on winderz
> or Macs.  Its all packed up, never powered up, get my money back until
> its private, and runs on linux.

https://linuxaria.com/article/how-to-sync-your-fitbit-under-linux


-- 
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] Beagle hal_arm335xQEP code

[Karl Jacobs]

https://github.com/machinekit/machinekit/tree/master/src/hal/drivers
Regards,
Karl

Am 24.02.2018 um 01:29 schrieb John Dammeyer:

Hi,
How do I get to the source code for the QEP module?
https://github.com/machinekoder/machinekit/wiki/hal_arm335xQEP

Thanks
John Dammeyer


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