Show all posts by user
Ok. Since LM317 is a linear regulator and power is dissipated by it, maybe we could do the same with a power transistor or mosfet?
Like using a current sense resistor and an opamp as a comparator of voltage across sense resistor. Like doing a linear variable current source for the laser. What do you think?
(I need to take time for reading projects about this DIY laser systems)
by
casainho
-
Laser Cutter Working Group
VDX Wrote:
-------------------------------------------------------
> ... here are some LM317-applications for constant
> current-driving and a simple workaround for
> generating geometrical defined pulses for the
> laser from the XY-clocks instead of calculating
> the needed power from the moving speed ...
I understand that LM317 designs. I also understand the XY-Pulsgenerator, wh
by
casainho
-
Laser Cutter Working Group
goinreverse Wrote:
-------------------------------------------------------
> Right now reprap is completely stuck, new
> participants can't get assembled electronics or
> printed parts. Contrast that with makerbot which
> will be moving 1,000 kits a month or more in 12-24
> months time. If you want to get a reprap what do
> you have to do today? Buy a makerbot... oops.
You are
by
casainho
-
Next Wave Electronics Working Group
> ... salvaging CD- and DVD-burners would be the
> cheapest start, but it's only good for some
> fuming, not real work.
>
> The 'cheap' burning diodes with 20$ to 30$ are
> only slightly more powerfull, but need all the
> aditional equipment, as the 5Watt-lasers
>
> So you can start with a wrecked DVD-burner, or go
> the 'powerfull' way - for me the 'burning' diod
by
casainho
-
Laser Cutter Working Group
In reply to
Triffid_Hunter Wrote:
-------------------------------------------------------
> modern microcontrollers of this calibre frequently
> don't come in 5v versions, so stick with the
> atmegas or go 3v3
Disadvantages of ATmegas when compared to ARM Cortex M0 and M3:
- very expensive if compared with a ARM Cortex with USB, at 100MHz and 256Kbytes flash;
- no Open Source debugge
by
casainho
-
Controllers
SebastienBailard Wrote:
-------------------------------------------------------
> I think there should be available money for a
> group of people be able to buy PCBs to
> experiment.
>
> The RRRF exist(ed) to organize and fund research
> like that
> but I think the guy running it may have moved on
> to other things.
Makerbot sells and then can have money to invest, but
by
casainho
-
Next Wave Electronics Working Group
I also use avrdude for ISP on GNU/Linux :-) and not Arduino bootloader.
There are info over Internet on how to burn Arduino bootloader using avrdude, you can try following that info. Also look at avrdude help!
by
casainho
-
Controllers
Unfortunately, "Follow Topic" gets selected every time for me, but the following option "Email me about replies to this topic" is unselected, so sometimes I forget to select it and I do not get any e-mail notification :-(
by
casainho
-
Administration, Announcements, Policy
VDX Wrote:
-------------------------------------------------------
> Hi casainho,
>
> ... the 1Watt-'burning'-diode is usable for first
> tests and slow cutting of black plastic-foils ...
> for cutting paper you need more power.
It could be a start for RepRap. We need to start with simple things and it is more easy to go further if we get more users/developers traction.
> A
by
casainho
-
Laser Cutter Working Group
> BatchPCB is fine for U.S. based users, but there
> is a world outside the US and paying $20-30
> shipping for a $5-10 pcb is ridiculous.
Thats true. Do you know other better options? I never used a PCB service... and I am from Portugal, Europe.
by
casainho
-
Next Wave Electronics Working Group
VDX Wrote:
-------------------------------------------------------
> Hi casainho,
>
> ... you can 'engrave' (or melt small cavities or
> grooves in) dark, good absorbing plastic-surfaces
> even with 220mW, but only slow and not in depth.
So maybe is a good bet to go with a 1W IR laser of $35, where we may be able to cut small thin sheets of some plastics or paper?
> For chan
by
casainho
-
Laser Cutter Working Group
In reply to
VDX Wrote:
-------------------------------------------------------
> ... i updated "Laser Cutter" in the Wiki - added
> sketch how embedding a pilot-laser and focussing
> the IR- and pilot-beams ...
My English is worst than VDX :-) -- so German even worst :-)
Viktor, with that 500mW red laser diodes from Ebay, what could we do? -- could we at least do engraving on some ma
by
casainho
-
Laser Cutter Working Group
BeagleFury Wrote:
-------------------------------------------------------
> Only drawback to this device I see is the 3.3V
> basis; I assume all the ports are 3.3V as well?
> This has the issue of being more susceptable to
> noise...
>
> Any idea if there is a 5V equivilant, or
> alternatively, Bodgit, any thoughts on using a
> alternative 3.3V + 12V lines for BEEF?
>
by
casainho
-
Controllers
ARM Cortex M3 looks like the way to go! Because provides more processing power at less price than AVR on Arduino! And ARM have the same Open Source tools PLUS the debugger! And I think debugger is important for such big and complex systems that RepRap is!
I am being working a little with ARM from Phillips NXP and Atmel. NXP have some cheap and nice ARM Cortex M0 and M3.
The M0 goes to 32Kbytes f
by
casainho
-
Controllers
SebastienBailard Wrote:
-------------------------------------------------------
> I've added [] and [] to the wiki.
>
> onics
>
> onics
>
> It may be good to give Generation 4 its own forum,
> since we'll see a lot of activity using those
> boards.
> What do you guys think?
I think there should be available money for a group of people be able to buy PCBs to exp
by
casainho
-
Next Wave Electronics Working Group
VDX Wrote:
-------------------------------------------------------
> The actual project with the salvaged pumping
> diodes is free as in OS, so i'll try to blog the
> complete development and publish in the wiki in
> english and with the GRRF and/or in the german
> forum in plain german ...
Why not buying a laser diode instead of trying to salvage?
And why not start with one che
by
casainho
-
Laser Cutter Working Group
I will follow this message and reprap wiki. Do you have a blog about your works?
I am interested on this subject.
by
casainho
-
Laser Cutter Working Group
annodomini2 Wrote:
-------------------------------------------------------
> If you want a cheap LPC1343 look at LPCxpresso,
> their £20 and come with free dev tools and a full
> JTAG.
>
> Ok its not the open solution, but it will help
> with development.
Are you from their marketing team? If we have better Free Software and Open Hardware solutions, why would we go with that c
by
casainho
-
Next Wave Electronics Working Group
> Binary size is a component of the code, compiler,
> instruction set/core design. Just because it
> currently doesn't fit in an AVR 8Bit micro with
> 32k, doesn't mean it won't in another
> microcontroller.
>
> Also there is much room for improvement in the
> current firmware. Look at Triffid's work on the
> FiveD for Arduino.
>
> And my own investigation of th
by
casainho
-
Next Wave Electronics Working Group
annodomini2 Wrote:
-------------------------------------------------------
> Another point 1 key feature of the LPC13 series is
> they have integrated USB ISP bootloader, which
> makes the flash of the device behave like a
> conventional USB memory stick. This is
> 'programmed' at the factory in the boot ROM. So no
> messing around with ICSP programmers.
I think I did mention t
by
casainho
-
Next Wave Electronics Working Group
Makerbot now sells one heated bed. What do you think about their solution?
by
casainho
-
General
ARM Cortex M3 looks like the way to go! Because provides more processing power at less price! And ARM have the same Open Source tools PLUS the debugger! And I think debugger is important for such big and complex systems that RepRap is!
I am being working a little with ARM from Phillips NXP and Atmel. NXP have some cheap and nice ARM Cortex M0 and M3.
The M0 goes to 32Kbytes flash and have a vers
by
casainho
-
Next Wave Electronics Working Group
> I would think controlling the internal ambient
> temprature would improve the general running of a
> RepRap. It would also save some power & time
> heating things up.
Or we believe on NopHead words or we can go try and find about it...
by
casainho
-
General
nophead Wrote:
-------------------------------------------------------
> casainho Wrote:
> --------------------------------------------------
> -----
> > Otherwise the
> > > extruder has to be made from high temperature
> > > materials and so cannot make itself.
> >
> > Since I remember, I saw a blog message showing
> > plastic filament being pu
by
casainho
-
General
khiraly Wrote:
-------------------------------------------------------
> > 150x150x15 were 15€ on a local shop
>
> So 330x330 piece would cost 72.6+ EUR. Aluminium
> is not cheap at all.
> So 100EUR for the whole thing seems pretty good
> deal to me. (if I can really make it that low).
> (and I need to machine it also, which is
> expensive)
Ok. I understand now that y
by
casainho
-
General
Otherwise the
> extruder has to be made from high temperature
> materials and so cannot make itself.
Since I remember, I saw a blog message showing plastic filament being push over a long tube of PTFE. The motor drive were very far from brass barrel.
If we put on an a metal box the X, Y and Z axis and the brass barrel, then plastic filament can be feed from outside at user room temperatur
by
casainho
-
General
khiraly Wrote:
-------------------------------------------------------
> > It's a bit expensive, I think
>
> The bfb bed is 330x330mm, it is more than four
> times bigger, then your 150x150 aluminium
> sheet...
>
> How much was your aluminium sheet?
>
> (Im just curious no offense at all)
150x150x15 were 15€ on a local shop. After that I bought at the same shop a
by
casainho
-
General
khiraly Wrote:
-------------------------------------------------------
> Just to inform you guys, I made my own prototype
> like a week ago, Im currently milling it flat with
> a dremel holder, and Im working on a second
> prototype, which I intend to sell too.
>
> Expect some articles at soon.
>
>
> As for the selling I plan to sell it at 100EUR if
> there are m
by
casainho
-
General
Following the idea of the Heated Bed add on to RepRap, I would like to start discussing a possible heated room - the advantages, problems and possible implementations.
Why a Heated Room?
Because printing on heated room (may*) makes final pieces stronger! Also (may*) help avoiding warping and (may*) make possible to print using other plastics.
*NopHead wrote about hot bed: (...) This is only 25%
by
casainho
-
General
chris-nobody Wrote:
-------------------------------------------------------
> Hallo to all,
> my idea is to wrap an alu sheet (200x2oox8)
>
> 200433808600&ssPageName=STRK:MEWAX:IT with
> teflon-film.
Today I bought another 150x150x6 aluminium sheet and it is bended :-( The one I bought with 15 thickness is the best one and the one that works until now.
> The sheet must b
by
casainho
-
General