[sudo-discuss] 3d printer solder paste dispensing at sudoroom using rpt2paste

[robb]

holidayz...

On Tue, Dec 18, 2018 at 6:47 PM Jake <jake at spaz.org> wrote:

> seriously no one had anything to say about any of this?
>
> On Wed, 5 Dec 2018, Jake wrote:
>
> > last night at sudoroom i did some things to get solder paste flowing
> from the
> > TAZ 3 3d printer.
> >
> > i brought in a compact air compressor and adjusted its power switch to
> click
> > off around 100 PSI (since it was failing to reach its design pressure in
> a
> > reasonable amount of time and we only need like 40-50PSI for solder
> paste)
> >
> > i'm not sure if it's still working because it cut out apparently due to
> heat
> > the last time i was running it, but possibly just because of duty
> cycle.  It
> > needs a fitting installed into the outlet to plumb it to the solenoid.
> > Fittings are in the box behind the printer and there's teflon tape in the
> > "tape" box on the shelves in sudoroom.
> >
> > i installed a three-port solenoid on the 3d printer which plugs in
> instead of
> > the extruder resistor / temperature sensor.  It contains a 47KΩ resistor
> to
> > simulate a thermistor (to avoid a fault code) and it wires the nozzle
> heater
> > wires to the three-port solenoid (which is rated at 24VDC matching the
> > printer's power supply)
> >
> > I piped the 3-port solenoid to a syringe and mounted a syringe holder on
> the
> > print head assembly in a reasonable place.  A syringe of solder paste is
> in
> > the
> > sudoroom fridge and can be used.  Needles of various sizes are in the
> > cardboard
> > box behind the 3d printer.
> >
> > the air compressor's outlet needs to be plumbed to the flexible black
> hose
> > going to the 3-port solenoid.  The solenoid needs to be mounted to the
> print
> > head (a twist-tie should work).
> >
> > unfortunately the 3D printer's firmware seems to be cycling power to the
> > nozzle
> > resistor when a temperature is selected, probably because of PID
> parameters,
> > so
> > we will have to look for a set of commands (or modified firmware) to
> activate
> > the solenoid properly during the dispensing process.  This printer
> doesn't
> > seem
> > to have wires for a print head fan, which is how we connected the
> solenoid in
> > past implementations of this setup.  There will need to be a script or
> > modification to rpt2pnp to issue the right commands for this setup.
> >
> > as a reminder the software for creating g-code to dispense solder paste
> from
> > the .rpt file output of a KiCAD circuitboard project is here:
> >
> > https://github.com/hzeller/rpt2paste
> >
> > note that it's superseded by
> >
> > https://github.com/hzeller/rpt2pnp
> >
> > which may be newer.  the latter was confirmed to (apparently) correctly
> > process
> > the .rpt file from the project we'll likely dispense solder paste onto
> first:
> >
> > https://github.com/fitzdoingprojects/big_battery
> >
> > i'll be gone for two weeks but if anyone wants to make progress on this
> > project
> > please write back and i'll help as much as i can.
> >
> > -jake_______________________________________________
> sudo-discuss mailing list
> sudo-discuss at lists.sudoroom.org
> https://sudoroom.org/lists/listinfo/sudo-discuss
>
-------------- next part --------------
An HTML attachment was scrubbed...
URL: <http://sudoroom.org/pipermail/sudo-discuss/attachments/20181218/d3f74fc9/attachment.html>