[Emc-users] potrace output to scalable gcode. Exists?

[Gene Heskett]

I've fixed and potrace'd to an eps file that looks ok when imported into 
gimp, of the handle outline of the cocking piece in a BP rifle.  I was 
under the impression that we had something that could take this .eps file 
and make gcode out of it, but I'll be dipped if I can recall its name.

Can anyone help?

Thanks.

Cheers, Gene
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Re: [Emc-users] potrace output to scalable gcode. Exists?

[Sebastian Kuzminsky]

For going from EPS to gcode I use PyCAM.  Bit of a learning curve, couple of 
wrinkles, but works well once you get past that.


Gene Heskett  wrote:

>I've fixed and potrace'd to an eps file that looks ok when imported
>into 
>gimp, of the handle outline of the cocking piece in a BP rifle.  I was 
>under the impression that we had something that could take this .eps
>file 
>and make gcode out of it, but I'll be dipped if I can recall its name.
>
>Can anyone help?
>
>Thanks.
>
>Cheers, Gene
>-- 
>"There are four boxes to be used in defense of liberty:
> soap, ballot, jury, and ammo. Please use in that order."
>-Ed Howdershelt (Author)
>My web page:  is up!
>My views 
>
>"Earth is a great, big funhouse without the fun."
>   -- Jeff Berner
>I was taught to respect my elders, but its getting 
>harder and harder to find any...
>
>--
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Re: [Emc-users] potrace output to scalable gcode. Exists?

[Lawrence Glaister]

On Sat, 2013-03-23 at 17:36 -0400, Gene Heskett wrote:
> I've fixed and potrace'd to an eps file that looks ok when imported into 
> gimp, of the handle outline of the cocking piece in a BP rifle.  I was 
> under the impression that we had something that could take this .eps file 
> and make gcode out of it, but I'll be dipped if I can recall its name.
> 
> Can anyone help?
> 
> Thanks.
> 
> Cheers, Gene

Hi Gene,
maybe you are thinking of pstoedit: version 3.50
Generates gcode (amongst a lot of other formats) from postscript
drawings.

It has an output driver that generates gcode.
see pstoedit -help
---
gcode:  .gcode: emc2 gcode format   
(/usr/lib/pstoedit/libp2edrvstd.so)
---
cheers
Lawrence



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Re: [Emc-users] potrace output to scalable gcode. Exists?

[Przemek Klosowski]

On Sat, Mar 23, 2013 at 5:36 PM, Gene Heskett  wrote:
> I've fixed and potrace'd to an eps file that looks ok when imported into
> gimp, of the handle outline of the cocking piece in a BP rifle.  I was
> under the impression that we had something that could take this .eps file
> and make gcode out of it, but I'll be dipped if I can recall its name.

I recommend using potrace within Inkscape (import the bitmap and
select Path->Trace Bitmap). From Inkscape you can save in any number
of vector formats, including AutoCAD DXF. There's also a Gcode output
driver for Inkscape:
http://wiki.linuxcnc.org/cgi-bin/wiki.pl?InkscapeHowto

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Re: [Emc-users] potrace output to scalable gcode. Exists?

[andy pugh]

On 23 March 2013 21:36, Gene Heskett  wrote:
> I've fixed and potrace'd to an eps file that looks ok when imported into
> gimp, of the handle outline of the cocking piece in a BP rifle.  I was
> under the impression that we had something that could take this .eps file
> and make gcode out of it, but I'll be dipped if I can recall its name.

Gcodetools in Inkscape?
Possibly SheetCAM (and definitely SheetCAM if you can save the EPS as a DXF)

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Re: [Emc-users] potrace output to scalable gcode. Exists?

[BRIAN GLACKIN]

I was looking at Gcodetools for inkscape last night.

Its actively supported by Nick off the russian forums.  I was looking to
import an HPGL file to eps through inkscape and out with gcodetools.  I am
not there yet but moving along.

The wiki discusses gcodetools v1.2 .  Its already upto v1.7 making the wiki
out of date.  My plan is to figure it out then see what I can do about
updating the wiki.  Gotta figure it out first.

Brian

On Sat, Mar 23, 2013 at 7:33 PM, andy pugh  wrote:

> On 23 March 2013 21:36, Gene Heskett  wrote:
> > I've fixed and potrace'd to an eps file that looks ok when imported into
> > gimp, of the handle outline of the cocking piece in a BP rifle.  I was
> > under the impression that we had something that could take this .eps file
> > and make gcode out of it, but I'll be dipped if I can recall its name.
>
> Gcodetools in Inkscape?
> Possibly SheetCAM (and definitely SheetCAM if you can save the EPS as a
> DXF)
>
> --
> atp
> If you can't fix it, you don't own it.
> http://www.ifixit.com/Manifesto
>
>
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Re: [Emc-users] potrace output to scalable gcode. Exists?

[Gene Heskett]

On Saturday 23 March 2013 20:59:56 Sebastian Kuzminsky did opine:

> For going from EPS to gcode I use PyCAM.  Bit of a learning curve,
> couple of wrinkles, but works well once you get past that.

More than my 78 YO face. :)

Well, I /think/ I had it doing what it was supposed to do since it demanded 
I extrude  the image before it could write 3d gcode.

Now I need to know the PyCAM author? as I have a requester on screen saying 
that I should forward the crash message it is displaying to the author.

An OOM error from the looks of it, and the system is 850 megs into swap in 
11 hours of uptime.  Not exactly good I surmise. :)

Cheers, Gene
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Re: [Emc-users] potrace output to scalable gcode. Exists?

[Gene Heskett]

On Saturday 23 March 2013 21:07:48 Lawrence Glaister did opine:

> On Sat, 2013-03-23 at 17:36 -0400, Gene Heskett wrote:
> > I've fixed and potrace'd to an eps file that looks ok when imported
> > into gimp, of the handle outline of the cocking piece in a BP rifle. 
> > I was under the impression that we had something that could take this
> > .eps file and make gcode out of it, but I'll be dipped if I can
> > recall its name.
> > 
> > Can anyone help?
> > 
> > Thanks.
> > 
> > Cheers, Gene
> 
> Hi Gene,
> maybe you are thinking of pstoedit: version 3.50
> Generates gcode (amongst a lot of other formats) from postscript
> drawings.
> 
> It has an output driver that generates gcode.
> see pstoedit -help
> ---
>   gcode:  .gcode: emc2 gcode format   
(/usr/lib/pstoedit/libp2edrvstd.so)
> ---
> cheers
> Lawrence
 
I'll give that a try as soon as I've emailed the PyCAM author the OOM error 
message as it died in thge middle of extruding the 2d pattern.  And 
rebooting too as I 850 megs into swap with 11 hours of uptime on a box with 
4Gb of ram.

Thank Lawrence.

Cheers, Gene
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Re: [Emc-users] potrace output to scalable gcode. Exists?

[Kent A. Reed]

On 3/23/2013 8:56 PM, BRIAN GLACKIN wrote:
> The wiki discusses gcodetools v1.2 .  Its already upto v1.7 making the wiki
> out of date.

The Wiki is out of date on many topics related to CAD/CAM :-(

>My plan is to figure it out then see what I can do about
> updating the wiki.  Gotta figure it out first.

...and this is exactly the right response. The Wiki is only as good as 
we make it. I owe it some material too. :-)

Regards,
Kent


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Re: [Emc-users] potrace output to scalable gcode. Exists?

[Gene Heskett]

On Saturday 23 March 2013 21:14:32 Lawrence Glaister did opine:

> On Sat, 2013-03-23 at 17:36 -0400, Gene Heskett wrote:
> > I've fixed and potrace'd to an eps file that looks ok when imported
> > into gimp, of the handle outline of the cocking piece in a BP rifle. 
> > I was under the impression that we had something that could take this
> > .eps file and make gcode out of it, but I'll be dipped if I can
> > recall its name.
> > 
> > Can anyone help?
> > 
> > Thanks.
> > 
> > Cheers, Gene
> 
> Hi Gene,
> maybe you are thinking of pstoedit: version 3.50
> Generates gcode (amongst a lot of other formats) from postscript
> drawings.
> 
> It has an output driver that generates gcode.
> see pstoedit -help
> ---
>   gcode:  .gcode: emc2 gcode format   
(/usr/lib/pstoedit/libp2edrvstd.so)
> ---
> cheers
> Lawrence
> 
Unforch, pstoedit --help, gets me a segfault & no help.  But the man page 
suggested a command line & darned if it didn't work before throwing another 
segfault, I guess its fond of those.  I did get the help screen at one 
point by givinbg it filenames but not the -f option.  TLC needed?

The output file contains enough hints that I can manipulate both size and 
orientation with an editor, and looks to be easy enough to convert into a 
subroutine to cut full depth.  It names the output file .ncg, not .ngc but 
thats minor.  The biggest problem is that NFS has suddenly ceased to work, 
so I can't send the file to the mill except with a usb key & a sneakernet.  
Ain't computers grand?  NOT!
 
Thanks Lawrence, it looks like I have a usable method now.

Cheers, Gene
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 soap, ballot, jury, and ammo. Please use in that order."
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Re: [Emc-users] potrace output to scalable gcode. Exists?

[Gene Heskett]

On Saturday 23 March 2013 21:39:26 Przemek Klosowski did opine:

> On Sat, Mar 23, 2013 at 5:36 PM, Gene Heskett  wrote:
> > I've fixed and potrace'd to an eps file that looks ok when imported
> > into gimp, of the handle outline of the cocking piece in a BP rifle. 
> > I was under the impression that we had something that could take this
> > .eps file and make gcode out of it, but I'll be dipped if I can
> > recall its name.
> 
> I recommend using potrace within Inkscape (import the bitmap and
> select Path->Trace Bitmap). From Inkscape you can save in any number
> of vector formats, including AutoCAD DXF. There's also a Gcode output
> driver for Inkscape:
> http://wiki.linuxcnc.org/cgi-bin/wiki.pl?InkscapeHowto
> 
All of these seem to need way more memory to work without an OOM tummy 
ache, on either the mill with 2G dram, or on this box with 4G dram.  PyCAM 
just took an OOM exit after running this machine 850 megs into swap, so 
this box is crawling on its belly.

It turns out that pstoedit can do it in 5 seconds, generating code I can 
manipulate to rotate and size, and convert into a o100 while/endwhile to 
carve it full depth.  Just what the Dr ordered.

Unforch, my stock of brass is .375" thick, and I need the part to be about 
0.190" thick, at least that portion that rides in the slot.  But those 
details are fairly minor compared to tracing the outline in the first 
place.

Cheers, Gene
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BOFH excuse #139:

UBNC (user brain not connected)
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Re: [Emc-users] potrace output to scalable gcode. Exists?

[cogoman]

On 03/23/2013 09:51 PM, Gene Heskett wrote:
> All of these seem to need way more memory to work without an OOM tummy
> ache, on either the mill with 2G dram, or on this box with 4G dram.  PyCAM
> just took an OOM exit after running this machine 850 megs into swap, so
> this box is crawling on its belly.
   Though I haven't gotten gcode from pycam myself (yet), from the 
videos I've seen, when you set it up to output milling gcode, it does 
the silly raster scan thing.  When I saw someone doing what I would want 
(2.5 D) they were setting the menus for engraving, and it still did 
gcode for muliple passes cutting an outline.

   If you're already there, you don't need this, but maybe it will help 
someone. Of course maybe I'm wrong, and can be corrected.  I'd like to 
become proficient in openscad->pycam->linuxcnc, and eventually blender-> 
pycam->linuxcnc.

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Re: [Emc-users] potrace output to scalable gcode. Exists?

[JohnBannister]

BlenderCam is a program which will convert blender 3d directly to GCode 
it is still in development and has quite a steep learning curve if you 
haven't used blender before. It will import stl files so can convert 
FreeCam  files.  If anyone tries it watch out for the Blendercam 
standard units are meters so 50mm in freecad becomes 50mts so the 
dimensions need to be Changed in BlenderCam and the top of the part 
needs to be zero on the z axis.
I made a short video of the out line of the process
  http://youtu.be/36GMWamk2MQ
It's a bit slow as the sampling is .2mm by .2mm (can be changed) but the 
program was designed for carving.
Whats potrace?


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Re: [Emc-users] potrace output to scalable gcode. Exists?

[Gene Heskett]

On Sunday 24 March 2013 07:24:37 JohnBannister did opine:

> BlenderCam is a program which will convert blender 3d directly to GCode
> it is still in development and has quite a steep learning curve if you
> haven't used blender before. It will import stl files so can convert
> FreeCam  files.  If anyone tries it watch out for the Blendercam
> standard units are meters so 50mm in freecad becomes 50mts so the
> dimensions need to be Changed in BlenderCam and the top of the part
> needs to be zero on the z axis.

Thats fixable in the gcode with an editor, its text.

> I made a short video of the out line of the process
>   http://youtu.be/36GMWamk2MQ
> It's a bit slow as the sampling is .2mm by .2mm (can be changed) but the
> program was designed for carving.

Thanks for the heads up on that.  I've /not/ mastered freecad yet.  And 
this is the first time I've heard of blendercam.  I'll google for it.  
Thanks.

> Whats potrace?

potrace, by Peter Selinger, takes a bitmap image in several formats as 
input, in this case a 1 bit deep .pnm, and generates a smoothed, scalable 
vector .eps file thats typically 1% to 5% of the size of the src image.  
Then in just a few seconds, pstoedit gave me an outline trace in GCode that 
was in the 100 line range for size.

Then I did a global swap of X & Y to rotate it to the angle the part is 
already mounted in the vice, adjusted the scale to suit, trimmed some 
wibbles out of the src scan & added a while loop construction so it could 
cut the full depth with a small 1/16" carbide mill.  All without throwing 
my machine 850 megs into swap with a failed PyCAM run that took over an 
hour to fail.

Its called efficiency.  And doing this part in brass makes it fit nicely 
into the BP scene since the trigger guard loop is also carved from that 
same .375" thick brass bar.  Some details yet to be incorporated, like tool 
comp for climb cutting.  Minor stuff, I just need to look up the proper 
gcodes to do it & add them to the .ngc file.

Your tight fit, 100% fine in that red oak, even desirable, is an artifact 
of the scan process, leaving teeny little ridges lining the bearing pocket.

The tradeoff here is that the vector scan and pstoedit doing gcode output 
are scaled to arbitrary size, allowing things to be adjusted by scale 
factors in the gcode to get any arbitrary size.

For a 28mm bearing pocket, I probably would have written a g2 or g3 loop, 
which would have (and did when I last used it), cut pair of near perfect 
bearing pockets in a pair of alu blocks when I made the new z axis drive 
for my HF micromill.  However, I'll admit also to spending half a day fine 
tuning the backlash comp to get rid of the reversal artifacts at the ends 
of the tables travels. :)  I haven't gotten around to putting ball screws 
in the mill, yet.  But if I don't fall over first, (I am 78 & a type 2 
diabetic) a new z carriage sled several inches longer is in order, probably 
driven with a 16mm ball screw,  And a pair of 8mm's to move the tables.  I 
have to make cages for those 8mm nuts, but that's doable.  I did it once 
already for my mini-lathe.

Cheers, Gene
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Re: [Emc-users] potrace output to scalable gcode. Exists?

[Gregg Eshelman]

--- On Sun, 3/24/13, Gene Heskett  wrote:

> JohnBannister did opine:

> > Whats potrace?
> 
> potrace, by Peter Selinger, takes a bitmap image in several
> formats as 
> input, in this case a 1 bit deep .pnm, and generates a
> smoothed, scalable 
> vector .eps file thats typically 1% to 5% of the size of the
> src image.  
> Then in just a few seconds, pstoedit gave me an outline
> trace in GCode that 
> was in the 100 line range for size.

Sounds like exactly the thing to make the parts I want to mill much easier to 
get into computer land than painstakingly measuring and CADding.

Put the original on a scanner, scan at crazy high resolution then use Photoshop 
to edit the image to feed to potrace.

Then use that outline to loft into 3D. The original item is 3/4" thick with a 
thin extension on one end, with a rounded fillet for strength. The back side of 
the original is hollowed out with some webs, die cast, breaks often.

I've been making spin cast Zamak copies but they also break, wasn't things like 
FEA in the 1940's. I figure solid CNC milled aluminum or steel should make the 
part indestructible, also much safer.

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Re: [Emc-users] potrace output to scalable gcode. Exists?

[Gene Heskett]

On Sunday 24 March 2013 23:19:10 Gregg Eshelman did opine:

> --- On Sun, 3/24/13, Gene Heskett  wrote:
> > JohnBannister did opine:
> > > Whats potrace?
> > 
> > potrace, by Peter Selinger, takes a bitmap image in several
> > formats as
> > input, in this case a 1 bit deep .pnm, and generates a
> > smoothed, scalable
> > vector .eps file thats typically 1% to 5% of the size of the
> > src image. 
> > Then in just a few seconds, pstoedit gave me an outline
> > trace in GCode that
> > was in the 100 line range for size.
> 
> Sounds like exactly the thing to make the parts I want to mill much
> easier to get into computer land than painstakingly measuring and
> CADding.
> 
> Put the original on a scanner, scan at crazy high resolution then use
> Photoshop to edit the image to feed to potrace.
> 
I think crazy hi rez was 300 dpi. 75 was the next step down & that didn't 
feel to be enough IMNSHO :)  I have the little handle pattern cut 1/4" into 
the brass, and have turned it over & now facing off the back, which when it 
gets to intersect the grooves of the handle, will let it fall to the table, 
in probably an hour from now.

But I did have a hell of a time with using G41, it refused to let me put in 
a width step that was less than mill diameter, 1/16th".  Once I'd made long 
ramps out of those, and had readjusted the 0,0 points and the scaling about 
50+ times, it worked well, so now I'm facing off the back till the part 
falls free.

> Then use that outline to loft into 3D. The original item is 3/4" thick
> with a thin extension on one end, with a rounded fillet for strength.
> The back side of the original is hollowed out with some webs, die cast,
> breaks often.
 
Ya might wanna post some pix at various angles with a small ruler for scale 
on imagebin with a weeks expiry so we can see what it is.

> I've been making spin cast Zamak copies but they also break, wasn't
> things like FEA in the 1940's. I figure solid CNC milled aluminum or
> steel should make the part indestructible, also much safer.

I'm hoping this will be too.  Its weak point will probably be the 0-80 
screws holding it in place, 2 of them on about 0.3250" centers IIRC.  
Finding grade 12's in 0-80 can't be done.  These look good, but are 
probably grade 3's at best.

> 
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Cheers, Gene
-- 
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 soap, ballot, jury, and ammo. Please use in that order."
-Ed Howdershelt (Author)
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My views 

Confession is good for the soul only in the sense that a tweed coat is
good for dandruff.
-- Peter de Vries
I was taught to respect my elders, but its getting 
harder and harder to find any...

--
Everyone hates slow websites. So do we.
Make your web apps faster with AppDynamics
Download AppDynamics Lite for free today:
http://p.sf.net/sfu/appdyn_d2d_mar
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