Re: [Emc-users] Rapid Prototype for CNC mill

[Ed Nisley]

On Thu, 2012-07-26 at 22:04 -0600, Jeshua Lacock wrote:
> deliver low cost more than anything

There's a good reason why the commercial outfits charge what they do
(other than that they can). But the resolution of DIY printers is now
good enough that second-order stuff like rigidity and control bandwidth
matter, so ... that must start happening.

> I am also curious how the filament feeders could be improved.

Use a ribbon filament fed into a cylindrical heater; the increased
surface area improves both traction and heat transfer.

The original patents cover a spring-loaded shutoff valve that might not
work nearly as well as described when immersed in viscous goo. IIRC,
there's a crosswise plunger shutoff, too.

Rather than retracting the filament with the feed motor, lift the feed
assembly with a solenoid by a specified amount to depressurize the
nozzle. 

I should have taken better notes; it got overwhelming after a while. Not
to mention that reading patents makes an absolutely marvelous insomnia
cure...

-- 
Ed
http://softsolder.com



--
Live Security Virtual Conference
Exclusive live event will cover all the ways today's security and 
threat landscape has changed and how IT managers can respond. Discussions 
will include endpoint security, mobile security and the latest in malware 
threats. http://www.accelacomm.com/jaw/sfrnl04242012/114/50122263/
___
Emc-users mailing list
Emc-users@lists.sourceforge.net
https://lists.sourceforge.net/lists/listinfo/emc-users

Re: [Emc-users] Spindle hooked to dc servo amp

[Jon Elson]

cogoman wrote:
>
>Another one (HP Pavilion Slimline s7600n) had Ubuntu Studio on it, 
> but it would drop back to a log in prompt without warning every 1/2 hour 
> to 1 hour. 
That's probably the security monitor, I'm sure that can be turned off, 
but I don't know
which of the 2000 security monitor programs this might be.
> *What you helped me with is* that the Mint PC appears to have a card 
> reader that only supports SD cards, but not SDHC.  I have a camera that 
> has an 8 GIG SDHC card with the photos I need on it, so I had to copy 
> them to the MEPIS machine. *Sftp took a little getting use to, very 
> little, to know the difference between ls and lls, and as you say, it 
> took care of the permissions nicely!
Yes, since it is a local process on each end, if you know the password 
to log in, you
have access to the files.  The original sftp was pretty limited, now you 
can do nearly
any standard shell command both locally and remotely.  And, of course,
man sftp
will give some useful info on how to use it.

Jon

--
Live Security Virtual Conference
Exclusive live event will cover all the ways today's security and 
threat landscape has changed and how IT managers can respond. Discussions 
will include endpoint security, mobile security and the latest in malware 
threats. http://www.accelacomm.com/jaw/sfrnl04242012/114/50122263/
___
Emc-users mailing list
Emc-users@lists.sourceforge.net
https://lists.sourceforge.net/lists/listinfo/emc-users

Re: [Emc-users] Rapid Prototype for CNC mill

[Jon Elson]

andy pugh wrote:
> On 27 July 2012 17:10, Jon Elson  wrote:
>
>   
>> will have to develop custom electronics, probably using an FPGA, to modulate
>> the laser to produce the raster.
>> 
>
> Maybe a HAL module?
> 1024x768x50kHz = 15 seconds per layer. (with scope for efficiences
> such as short scans)
>   
Because the beam sweeps far past the vat and only the middle part of the 
sweep is used
to maintain the best linearity, the pixel frequency is probably higher 
than this.
But, the amount of data actually in a layer is quite small.  It could 
probably be
compressed by run-length encoding to make a compact data format.

For each sweep, the beam is turned on until it hits a detector with a 
slit in front
of it, then it starts the clock to time out the pixels.  This should be 
pretty easy to
do in an FPGA, but would be pretty much impossible directly by software.
I think somebody is doing it with the DMA channel on an Arduino or similar
micro, too.

Jon

--
Live Security Virtual Conference
Exclusive live event will cover all the ways today's security and 
threat landscape has changed and how IT managers can respond. Discussions 
will include endpoint security, mobile security and the latest in malware 
threats. http://www.accelacomm.com/jaw/sfrnl04242012/114/50122263/
___
Emc-users mailing list
Emc-users@lists.sourceforge.net
https://lists.sourceforge.net/lists/listinfo/emc-users

Re: [Emc-users] Rapid Prototype for CNC mill

[Jon Elson]

a...@conceptmachinery.com wrote:
> Hi
> Jon
> i want to be sure about how any plastic introduce- ejected from head. 
>   
No, this DLP system works with a vat of liquid resin that is hardened by 
exposure to light
from the projector.  There are no drops, printing head or anything like 
that.

The layer image is projected up through the bottom of the vat for about 
8 seconds, then
the build platform is raised to allow new resin to flow under it, and 
the process is
repeated.

Jon

--
Live Security Virtual Conference
Exclusive live event will cover all the ways today's security and 
threat landscape has changed and how IT managers can respond. Discussions 
will include endpoint security, mobile security and the latest in malware 
threats. http://www.accelacomm.com/jaw/sfrnl04242012/114/50122263/
___
Emc-users mailing list
Emc-users@lists.sourceforge.net
https://lists.sourceforge.net/lists/listinfo/emc-users

Re: [Emc-users] One more question on the G540 and 5i25?

[Peter C. Wallace]

On Fri, 27 Jul 2012, Bryce Johnson wrote:

> Date: Fri, 27 Jul 2012 14:12:49 -0500
> From: Bryce Johnson 
> Reply-To: "Enhanced Machine Controller (EMC)"
> 
> To: "Enhanced Machine Controller (EMC)" 
> Subject: [Emc-users] One more question on the G540 and 5i25?
> 
> One other thing I was having an issue with was the G540 step settings.
>
> I previously had g251s for the steppers (which are the same thing that is
> inside the G540).  I used the step rate from the pncconf of:
>
> DIRSETUP   = 200
> DIRHOLD= 200
> STEPLEN= 1000
> STEPSPACE  = 2000
>
> For some reason I was missing steps and it would refuse to function at low
> speeds (like 5 ipm).  I boosted the steplen to 2000 and that solved my
> problem.  Anyone have any idea why that is?


Different polarity or different interface drive voltage may affect this as 
this is close to the OPTO coupler speed limits.

Also using the _minimum_ value is probably asking for trouble as theres no 
margin.

even 5000 ns step space and steplen would not hurt anything. It would limit 
you to 100 KHz but on a 10 uStep Gecko this is 3000 RPM, = out of the 
normal range of step motors

Peter Wallace
Mesa Electronics


--
Live Security Virtual Conference
Exclusive live event will cover all the ways today's security and 
threat landscape has changed and how IT managers can respond. Discussions 
will include endpoint security, mobile security and the latest in malware 
threats. http://www.accelacomm.com/jaw/sfrnl04242012/114/50122263/
___
Emc-users mailing list
Emc-users@lists.sourceforge.net
https://lists.sourceforge.net/lists/listinfo/emc-users

[Emc-users] One more question on the G540 and 5i25?

[Bryce Johnson]

One other thing I was having an issue with was the G540 step settings.

I previously had g251s for the steppers (which are the same thing that is
inside the G540).  I used the step rate from the pncconf of:

DIRSETUP   = 200
DIRHOLD= 200
STEPLEN= 1000
STEPSPACE  = 2000

For some reason I was missing steps and it would refuse to function at low
speeds (like 5 ipm).  I boosted the steplen to 2000 and that solved my
problem.  Anyone have any idea why that is?
--
Live Security Virtual Conference
Exclusive live event will cover all the ways today's security and 
threat landscape has changed and how IT managers can respond. Discussions 
will include endpoint security, mobile security and the latest in malware 
threats. http://www.accelacomm.com/jaw/sfrnl04242012/114/50122263/
___
Emc-users mailing list
Emc-users@lists.sourceforge.net
https://lists.sourceforge.net/lists/listinfo/emc-users

[Emc-users] [OT] I wonder what lathe this is modelled on?

[Roland Jollivet]

On 26 July 2012 04:17, Kent A. Reed  wrote:

> On 7/25/2012 2:44 PM, andy pugh wrote:
> > http://www.modvid.com.au/assets/images/anders_bike_shop03.jpg
> > Looks like a nice 0.07" centre-height lathe.
> >
> > The full set is at :
> > http://www.modvid.com.au/html/body_anders_bike_shop_details.html
>
> The meticulousness of this model surpasses any diorama I've seen at any
> scale. I found myself responding emotionally to it. There was a sense of
> "wait, haven't I been in this shop?" Curiously, I spent part of a trip
> to Ohio last month trying to find a similar shop, in existence 45 years
> ago, where I bought my last motorcycle, a Norton Atlas. I found just a
> vacant cinder-block building in complete disrepair with no evidence of
> its past---no decals in windows, no RidgidTool calendars on walls, no
> parts in the bin. Sic transit gloria mundi.
>
> As for the lathe, my experience with full-sized lathes began and ended
> with South Bends and Hardinges. Not a clue.
>
>
> Thanks for the pointer.
>
> Regards,
> Kent
>
> --


Where most of the models come from;

http://www.sierrawestscalemodels.com/oscale/oscale.shtml

http://www.sierrawestscalemodels.com/oscale/machine.shtml

http://www.sierrawestscalemodels.com/oscale/mt/machine01.shtml

Regards
Roland
--
Live Security Virtual Conference
Exclusive live event will cover all the ways today's security and 
threat landscape has changed and how IT managers can respond. Discussions 
will include endpoint security, mobile security and the latest in malware 
threats. http://www.accelacomm.com/jaw/sfrnl04242012/114/50122263/
___
Emc-users mailing list
Emc-users@lists.sourceforge.net
https://lists.sourceforge.net/lists/listinfo/emc-users

Re: [Emc-users] Spindle hooked to dc servo amp

[cogoman]

On 07/17/2012 12:36 PM, Jon Elson wrote:
> I don't use NFS, just sftp, and it works fine and is pretty easy to move
> files around between
> machines.
   Thanks for this tip, Jon.  I have 3 machines here.  The one (Compaq 
with Athlon 64 and obscure A8N-LA motherboard) that has my wife's and my 
EMAIL accounts has Linux Mint (I believe it's 11).  It also has the 
printer attached to it.  Mint 11 seems to be confused as to where it 
wants to take commands from.  To shut down we have to go upper right 
rather than lower left.

   Another one (HP Pavilion Slimline s7600n) had Ubuntu Studio on it, 
but it would drop back to a log in prompt without warning every 1/2 hour 
to 1 hour.  So I put MEPIS 11 on it, and it seems to be very stable.  I 
also like MEPIS.

   The 3rd PC is another Compaq, but with a Sempron.  None of these 
would accept the latest version of LinuxCNC, which I desperately wanted 
because named subroutines could have text names.  In my playing around 
with these I came across a setting in the BIOS that looked suspicious, 
so I flipped the switch, and behold! Ubuntu 10.04 with LinuxCNC 
installed and ran as it should!  It didn't have anything to do with the 
usual dealbreakers, but I'd have to look it up to find out what it was I 
changed.

   Right now I have the MEPIS and Mint PCs on a 2 port USB KVM switch.

*What you helped me with is* that the Mint PC appears to have a card 
reader that only supports SD cards, but not SDHC.  I have a camera that 
has an 8 GIG SDHC card with the photos I need on it, so I had to copy 
them to the MEPIS machine. *Sftp took a little getting use to, very 
little, to know the difference between ls and lls, and as you say, it 
took care of the permissions nicely!*
--
Live Security Virtual Conference
Exclusive live event will cover all the ways today's security and 
threat landscape has changed and how IT managers can respond. Discussions 
will include endpoint security, mobile security and the latest in malware 
threats. http://www.accelacomm.com/jaw/sfrnl04242012/114/50122263/
___
Emc-users mailing list
Emc-users@lists.sourceforge.net
https://lists.sourceforge.net/lists/listinfo/emc-users

Re: [Emc-users] xml for G540 and pncconf with 5i25?

[Bryce Johnson]

That worked.  Thanks Peter!

On Fri, Jul 27, 2012 at 11:44 AM, Peter C. Wallace  wrote:

> On Fri, 27 Jul 2012, Bryce Johnson wrote:
>
> > Date: Fri, 27 Jul 2012 11:29:20 -0500
> > From: Bryce Johnson 
> > Reply-To: "Enhanced Machine Controller (EMC)"
> > 
> > To: "Enhanced Machine Controller (EMC)"  >
> > Subject: Re: [Emc-users] xml for G540 and pncconf with 5i25?
> >
> > Is this how you would configure the hal?
> >
> > setp   hm2_5i25.0.stepgen.04.steplen 1
> > setp   hm2_5i25.0.stepgen.04.stepspace   1
> > setp   hm2_5i25.0.stepgen.04.step_type2
> > setp   hm2_5i25.0.stepgen.04.control-type 1
> > setp   hm2_5i25.0.stepgen.04.enable 1
> > setp   hm2_5i25.0.stepgen.04.velocity-cmd.25
> >
> > I thought that seemed like everything but I can't get it to work.  Also I
> > loaded the G540x2.bit  file into the mesa.
> >
> > On Tue, Jul 24, 2012 at 10:47 PM, Peter C. Wallace 
> wrote:
>
> You would need to set the stepgens position scale to 1 to get a 10KHz
> square wave.
>
>
>
> Peter Wallace
> Mesa Electronics
>
>
> --
> Live Security Virtual Conference
> Exclusive live event will cover all the ways today's security and
> threat landscape has changed and how IT managers can respond. Discussions
> will include endpoint security, mobile security and the latest in malware
> threats. http://www.accelacomm.com/jaw/sfrnl04242012/114/50122263/
> ___
> Emc-users mailing list
> Emc-users@lists.sourceforge.net
> https://lists.sourceforge.net/lists/listinfo/emc-users
>
--
Live Security Virtual Conference
Exclusive live event will cover all the ways today's security and 
threat landscape has changed and how IT managers can respond. Discussions 
will include endpoint security, mobile security and the latest in malware 
threats. http://www.accelacomm.com/jaw/sfrnl04242012/114/50122263/
___
Emc-users mailing list
Emc-users@lists.sourceforge.net
https://lists.sourceforge.net/lists/listinfo/emc-users

Re: [Emc-users] Rapid Prototype for CNC mill

[andy pugh]

On 27 July 2012 17:10, Jon Elson  wrote:

> will have to develop custom electronics, probably using an FPGA, to modulate
> the laser to produce the raster.

Maybe a HAL module?
1024x768x50kHz = 15 seconds per layer. (with scope for efficiences
such as short scans)

-- 
atp
If you can't fix it, you don't own it.
http://www.ifixit.com/Manifesto

--
Live Security Virtual Conference
Exclusive live event will cover all the ways today's security and 
threat landscape has changed and how IT managers can respond. Discussions 
will include endpoint security, mobile security and the latest in malware 
threats. http://www.accelacomm.com/jaw/sfrnl04242012/114/50122263/
___
Emc-users mailing list
Emc-users@lists.sourceforge.net
https://lists.sourceforge.net/lists/listinfo/emc-users

Re: [Emc-users] Rapid Prototype for CNC mill

[a]

Hi
Jon
i want to be sure about how any plastic introduce- ejected from head. 
Is this continues flow or this is drop by drop of plastic material?
i think that when build the border of work-part where accuracy is 
needed to be drop of material and inside work-part possible continues 
flow to do fast.

Size of the each drop will determine accuracy of whole system. i think 
size of drop should be around 0.001-0.005" or bigger. When accuracy of 
drop be between 0.001-0.005" there may not need for –“the
wiper and other surface leveling schemes are covered by patents, and
these may have”
Have a small drop of plastic size of 0.001-0.005” can help with curing 
when used with heated wax. Plastic is important material but also many 
wax model used to make casting for commercial application.

Also, servo system that controls ejection of plastic/wax material 
should be same as those that controls X Y Z motion of the head. That 
will make setting of machine much robust and less experimental. I think 
EMC2 can be good in this.

Thanks
Aram




>> Yes, I am familiar with the project and DLP printing technology.
>>
>> I did not know about the patent work-around however.
>>
> Yes, the guys on that group, especially Michael Joyce did a lot of 
> work
> to deconstruct
> what the patents did, and didn't cover, so he could be sure to not 
> infringe.
>>
>> True, but the resin is much less expensive from the b9 project. The 
>> b9 resin is closer to $100 per liter, but still.
>>
> Well, a 75 mm cube is 420 ccs, and your vat probably ends up being
> bigger than that.
> The resin probably deteriorates by being exposed to air for a long
> time.  Also, the
> wiper and other surface leveling schemes are covered by patents, and
> these may have
> covered all the logical systems, as well as making the printer a lot
> more complicated.
>
>> Not to mention no need for support material.
>>
> Not true.  In fact, that is about the only drawback to the DLP 
> system,
> is there is no
> way to make a model with a different (soluble) support material.  
> There
> are certainly
> some models that have separable parts or gaps in the parts that could
> use a support material.
> Proper layout of the build can sometimes overcome this by building at 
> an
> angle.
>
> The other drawback is the fixed number of pixels on the projector.  A
> guy in England
> is working on using the spinning mirror from a laser printer, a 
> powerful
> blue diode
> laser and a carriage to scan the raster down the vat to make a 
> machine
> that has high
> resolution over a larger build area.  His early tests look quite
> promising.  But, he
> will have to develop custom electronics, probably using an FPGA, to 
> modulate
> the laser to produce the raster.  (It is possible to gut a laser 
> printer
> and fudge the
> myriad sensor inputs, but it might be a lot easier to just start from
> scratch.)
>
> Jon
> Jon
>
> 
> --
> Live Security Virtual Conference
> Exclusive live event will cover all the ways today's security and
> threat landscape has changed and how IT managers can respond. 
> Discussions
> will include endpoint security, mobile security and the latest in 
> malware
> threats. http://www.accelacomm.com/jaw/sfrnl04242012/114/50122263/
> ___
> Emc-users mailing list
> Emc-users@lists.sourceforge.net
> https://lists.sourceforge.net/lists/listinfo/emc-users


--
Live Security Virtual Conference
Exclusive live event will cover all the ways today's security and 
threat landscape has changed and how IT managers can respond. Discussions 
will include endpoint security, mobile security and the latest in malware 
threats. http://www.accelacomm.com/jaw/sfrnl04242012/114/50122263/
___
Emc-users mailing list
Emc-users@lists.sourceforge.net
https://lists.sourceforge.net/lists/listinfo/emc-users

Re: [Emc-users] xml for G540 and pncconf with 5i25?

[Peter C. Wallace]

On Fri, 27 Jul 2012, Bryce Johnson wrote:

> Date: Fri, 27 Jul 2012 11:29:20 -0500
> From: Bryce Johnson 
> Reply-To: "Enhanced Machine Controller (EMC)"
> 
> To: "Enhanced Machine Controller (EMC)" 
> Subject: Re: [Emc-users] xml for G540 and pncconf with 5i25?
> 
> Is this how you would configure the hal?
>
> setp   hm2_5i25.0.stepgen.04.steplen 1
> setp   hm2_5i25.0.stepgen.04.stepspace   1
> setp   hm2_5i25.0.stepgen.04.step_type2
> setp   hm2_5i25.0.stepgen.04.control-type 1
> setp   hm2_5i25.0.stepgen.04.enable 1
> setp   hm2_5i25.0.stepgen.04.velocity-cmd.25
>
> I thought that seemed like everything but I can't get it to work.  Also I
> loaded the G540x2.bit  file into the mesa.
>
> On Tue, Jul 24, 2012 at 10:47 PM, Peter C. Wallace  wrote:

You would need to set the stepgens position scale to 1 to get a 10KHz 
square wave.



Peter Wallace
Mesa Electronics

--
Live Security Virtual Conference
Exclusive live event will cover all the ways today's security and 
threat landscape has changed and how IT managers can respond. Discussions 
will include endpoint security, mobile security and the latest in malware 
threats. http://www.accelacomm.com/jaw/sfrnl04242012/114/50122263/
___
Emc-users mailing list
Emc-users@lists.sourceforge.net
https://lists.sourceforge.net/lists/listinfo/emc-users

Re: [Emc-users] xml for G540 and pncconf with 5i25?

[Bryce Johnson]

Is this how you would configure the hal?

setp   hm2_5i25.0.stepgen.04.steplen 1
setp   hm2_5i25.0.stepgen.04.stepspace   1
setp   hm2_5i25.0.stepgen.04.step_type2
setp   hm2_5i25.0.stepgen.04.control-type 1
setp   hm2_5i25.0.stepgen.04.enable 1
setp   hm2_5i25.0.stepgen.04.velocity-cmd.25

I thought that seemed like everything but I can't get it to work.  Also I
loaded the G540x2.bit  file into the mesa.

On Tue, Jul 24, 2012 at 10:47 PM, Peter C. Wallace  wrote:

> On Wed, 25 Jul 2012, Chris Morley wrote:
>
> > Date: Wed, 25 Jul 2012 00:47:48 +
> > From: Chris Morley 
> > Reply-To: "Enhanced Machine Controller (EMC)"
> > 
> > To: EMC 
> > Subject: Re: [Emc-users] xml for G540 and pncconf with 5i25?
> >
> >
> >
> >
> >> Date: Tue, 24 Jul 2012 17:28:53 -0500
> >> From: sie...@gmail.com
> >> To: emc-users@lists.sourceforge.net
> >> Subject: [Emc-users] xml for G540 and pncconf with 5i25?
> >>
> >> I got a G540 so I switched over the 5i25 firmware to the G540x2.  Was
> there
> >> an XML file for use with pncconf?   I did some searching and couldn't
> come
> >> up with anything.  I had used the prob_rfx2 xml with the BOB I had
> >> previously.
> >>
> >> Thanks
> >> Bryce
> >
> > I have not made a XML file for this yet... I thought it had a charge
> pump component,
> > which PNCconf doesn't know about but I can not see that in the PIN file,
> so I
> > should be able to build one the PNCconf can already use... I'll see if I
> have time tonight.
> >
> > Chris M
>
> The latest G540 configuration uses a one output stepgen for the chargepump
> due to that rather annoying G540 "feature" that the chargepump needs a
> 10 KHz frequency which would force the use of a base thread if the bit was
> just GPIO (dont know why 500 Hz would not have done, oh well)
>
> The chargepump stepgens are at the end numerically so dont interfere with
> the G540s stepgen assignment (they are stepgen 8 (P3) and 9 (P2))
>
>
> There are a couple ways to get a square wave out of the stepgen. One is to
> set
> the position scale to 1, set stepgen output mode to quadrature and
> operating mode to velocity and finally set the velocity to .25 (this is .25
> instead of 1 because quadrature mode counts 4x as fast at step/dir mode)
>
>
>
> >
> >
> --
> > Live Security Virtual Conference
> > Exclusive live event will cover all the ways today's security and
> > threat landscape has changed and how IT managers can respond. Discussions
> > will include endpoint security, mobile security and the latest in malware
> > threats. http://www.accelacomm.com/jaw/sfrnl04242012/114/50122263/
> > ___
> > Emc-users mailing list
> > Emc-users@lists.sourceforge.net
> > https://lists.sourceforge.net/lists/listinfo/emc-users
> >
>
> Peter Wallace
> Mesa Electronics
>
> (\__/)
> (='.'=) This is Bunny. Copy and paste bunny into your
> (")_(") signature to help him gain world domination.
>
>
>
> --
> Live Security Virtual Conference
> Exclusive live event will cover all the ways today's security and
> threat landscape has changed and how IT managers can respond. Discussions
> will include endpoint security, mobile security and the latest in malware
> threats. http://www.accelacomm.com/jaw/sfrnl04242012/114/50122263/
> ___
> Emc-users mailing list
> Emc-users@lists.sourceforge.net
> https://lists.sourceforge.net/lists/listinfo/emc-users
>
--
Live Security Virtual Conference
Exclusive live event will cover all the ways today's security and 
threat landscape has changed and how IT managers can respond. Discussions 
will include endpoint security, mobile security and the latest in malware 
threats. http://www.accelacomm.com/jaw/sfrnl04242012/114/50122263/
___
Emc-users mailing list
Emc-users@lists.sourceforge.net
https://lists.sourceforge.net/lists/listinfo/emc-users

Re: [Emc-users] Rapid Prototype for CNC mill

[Jon Elson]

dave wrote:
>
>
> I like the inverted approach. 
>
> More to the point what is the absorbtion max wavelength for the polymer?
> In more specific terms what wavelength gives the best polymerization?
> Curious minds want to know. ;-)
>  
> To put in simpler terms what emission source is likely to maximize
> polymerization?
>   
Due to the availability of the DLP projectors, these guys went to a lot 
of trouble to
come up with visible-sensitive photoinitiators.  They work around 280 - 
420 nm,
with good sensitivity at 405 nm, which a DLP projector will pass, and 
the lamps
have a little peak at 405 from the Hg in them.  If you can get 
illumination at 385 nm,
there are more initiators available.  Fernando in Spain has a business 
supplying
resin systems at excellent prices, I'm pretty sure he is the resin 
supplier to the
b9creator project, and a number of other people on the group are also 
using his
resin.  Fernando has a web site with a list of the resins he has for 
sale, he has
a variety of physical properties as well as light sensitivities 
available.  He has
a link on the diy3d group.

With 8 seconds/layer exposure, I think the optical part is well in hand.

Jon

--
Live Security Virtual Conference
Exclusive live event will cover all the ways today's security and 
threat landscape has changed and how IT managers can respond. Discussions 
will include endpoint security, mobile security and the latest in malware 
threats. http://www.accelacomm.com/jaw/sfrnl04242012/114/50122263/
___
Emc-users mailing list
Emc-users@lists.sourceforge.net
https://lists.sourceforge.net/lists/listinfo/emc-users

Re: [Emc-users] Rapid Prototype for CNC mill

[Jon Elson]

Jeshua Lacock wrote:
>
> Yes, I am familiar with the project and DLP printing technology.
>
> I did not know about the patent work-around however.
>   
Yes, the guys on that group, especially Michael Joyce did a lot of work 
to deconstruct
what the patents did, and didn't cover, so he could be sure to not infringe.
>
> True, but the resin is much less expensive from the b9 project. The b9 resin 
> is closer to $100 per liter, but still.
>   
Well, a 75 mm cube is 420 ccs, and your vat probably ends up being 
bigger than that.
The resin probably deteriorates by being exposed to air for a long 
time.  Also, the
wiper and other surface leveling schemes are covered by patents, and 
these may have
covered all the logical systems, as well as making the printer a lot 
more complicated.

> Not to mention no need for support material.
>   
Not true.  In fact, that is about the only drawback to the DLP system, 
is there is no
way to make a model with a different (soluble) support material.  There 
are certainly
some models that have separable parts or gaps in the parts that could 
use a support material.
Proper layout of the build can sometimes overcome this by building at an 
angle.

The other drawback is the fixed number of pixels on the projector.  A 
guy in England
is working on using the spinning mirror from a laser printer, a powerful 
blue diode
laser and a carriage to scan the raster down the vat to make a machine 
that has high
resolution over a larger build area.  His early tests look quite 
promising.  But, he
will have to develop custom electronics, probably using an FPGA, to modulate
the laser to produce the raster.  (It is possible to gut a laser printer 
and fudge the
myriad sensor inputs, but it might be a lot easier to just start from 
scratch.)

Jon
Jon

--
Live Security Virtual Conference
Exclusive live event will cover all the ways today's security and 
threat landscape has changed and how IT managers can respond. Discussions 
will include endpoint security, mobile security and the latest in malware 
threats. http://www.accelacomm.com/jaw/sfrnl04242012/114/50122263/
___
Emc-users mailing list
Emc-users@lists.sourceforge.net
https://lists.sourceforge.net/lists/listinfo/emc-users

Re: [Emc-users] Rapid Prototype for CNC mill

[andy pugh]

On 27 July 2012 05:09, Jeshua Lacock  wrote:

> Not to mention no need for support material.

I think you do need support, or isolated islands of material will
either not be lifted and/or wont get dragged and unstuck.

-- 
atp
If you can't fix it, you don't own it.
http://www.ifixit.com/Manifesto

--
Live Security Virtual Conference
Exclusive live event will cover all the ways today's security and 
threat landscape has changed and how IT managers can respond. Discussions 
will include endpoint security, mobile security and the latest in malware 
threats. http://www.accelacomm.com/jaw/sfrnl04242012/114/50122263/
___
Emc-users mailing list
Emc-users@lists.sourceforge.net
https://lists.sourceforge.net/lists/listinfo/emc-users

Re: [Emc-users] Rapid Prototype for CNC mill

[Jeshua Lacock]

On Jul 26, 2012, at 10:35 PM, dave wrote:

> I like the inverted approach. 
> 
> More to the point what is the absorbtion max wavelength for the polymer?
> In more specific terms what wavelength gives the best polymerization?
> Curious minds want to know. ;-)
> 
> To put in simpler terms what emission source is likely to maximize
> polymerization?

Hi Dave,

I think traditionally DLP has used UV.

I am not sure about the b9 resin, but it apparently uses visible light.

You might try asking Michael Joyce:

http://www.kickstarter.com/projects/b9creations/b9creator-a-high-resolution-3d-printer

Or perhaps the yahoo user group Jon mentioned:

diy_3d_printing_and_fabricat...@yahoogroups.com


Best,

Jeshua Lacock
Founder/Engineer
3DTOPO Incorporated

Phone: 208.462.4171


--
Live Security Virtual Conference
Exclusive live event will cover all the ways today's security and 
threat landscape has changed and how IT managers can respond. Discussions 
will include endpoint security, mobile security and the latest in malware 
threats. http://www.accelacomm.com/jaw/sfrnl04242012/114/50122263/
___
Emc-users mailing list
Emc-users@lists.sourceforge.net
https://lists.sourceforge.net/lists/listinfo/emc-users