19 Dec
2018
19 Dec
'18
2:07 p.m.
I just kept it to myself, stencils are better.
Also, did you sacrifice the 3d printer to accomplish this?
On Tue, Dec 18, 2018 at 6:47 PM Jake <jake(a)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note that it's superseded by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_______________________________________________
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