Find or make a one way ratchet or roller sprag to fit to the pump motors so
they can't spring back.
On Thursday, October 29, 2020, 6:55:25 AM MDT, Gene Heskett
<ghesk...@shentel.net> wrote:
On Wednesday 28 October 2020 18:05:06 Gene Heskett wrote:
Since I have these OLIMEX gismos that are useless at 24 volts, but Chris
claims zero heat at 12 volts, I do have a couple places I can use these.
I have a tiny peristaltic pump which delivers an invisible mist to cool
the tool and prevent its packing full of alu and snapping it off halfway
thru the job. Using two cross-coupled one shots to generate an on/off
signal for a transistor running the pump. the individual one shots are
controlled by pyvcp sliders so I can independently control the on off
time. These pumps work by rollers on thin walled si tubing and haven't
the best expected lifetime before the si tubing cracks and fails.
Currently the armature is advancing 15 or so degrees, but rebounding
14.5 degrees, which is subjecting the tubing to a lot of flexing it
doesn't need.
Since these OLIMEX things can crowbar the motor in the pwm off state,
that should discourage most of the springback, and only require an on
time to move a degree per pulse, much less repeated flexing of the pump
tube should result. So since I do have 12 volts to run it with on the
6040, that will be my next project. I bought 4 of those pumps knowing
they have a limited lifetime, but if this works on the 6040, I've 2 of
these otherwise useless OLIMEX gismo's, so the 2nd one will either go on
the G0704 or maybe on the Sheldon. The G0704 needs it the worst.
So there you have it, a potential way to run a mister pump, at flow rates
so dry its not messy but still gets the cooling job done. My present
method works but is much harder on the pumps tubing than it needs to be.
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