I'm not sure I participated in the previous discussion but it is something
I've been doing for about the last 6 months now. I replaced my old setup
which was air combined with mist via pressurizing the mist tank and
carefully regulating each stream via pnuematic regulator and a quite small
flow control valve on the coolant line. That never really worked very well
as the cheap regulators seemed to drift and the flow control valve
occasionally died due to small amounts of solids in the coolant.
I'm using one of the little 12v pumps, 1*3 tubing, the smaller the tubing
the less it flows, and I find I want to run the smallest possible size to
get reasonable mist usage.
For reference, here's an example.
https://www.ebay.ca/itm/DC12V-24V-Peristaltic-Dosing-pump-For-Aquarium-Lab-Chemical-Analysis-1PC/352574372597
I drive this via a motor driver circuit and arduino using PWM to control
motor speed and also I built sort of an coolant flow if you will into HAL
that will run the pump only a percentage of the time, I find even with the
smallest tubing the pump at full speed moves a ton of coolant for a mist
system doing the kind of fairly small aluminum work I mostly do. A stepper
motor for proper low speed control would be better if you're willing to
spend the coin.
The tubing connectors are a bit of a weak point, they tend to blow off
around 40psi in my experience. I generally run my mist at more like 10 but
accidents happen...
These units are definitely throw away, put yours where you can service it
and replace it easily. I'm still on the same motor but I had to replace a
pump head due to wear on the rollers and tubing after maybe 200 hours of
actual on time? At some point the pump head stalled but the motor kept
spinning and it sort of flat spots the plastic rollers.
Overall I'm pleased with the peristaltic pump idea and won't be going back
to manually balancing mist flow with flow control and regulators.
-Dave
On Mon, 09 Nov 2020 16:31:24 -0500, <[email protected]> wrote:
Some time ago there was a little discussion about using a peristaltic
pump to supply coolant to a mister. Was this successful? Which pump was
used? Is silicone tubing resistant to coolant?
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