I'm surprised your not using a pressure pot to spray the coolant.
You could put an electric valve on the output and pulse it on and off.
Harbor Freight has a cheap pressure pot/spray gun setup. Just use the pot.
Sometimes low tech is good. :-)
Dave
On 10/22/2019 9:22 PM, Gene Heskett wrote:
On Tuesday 22 October 2019 19:31:59 Thaddeus Waldner wrote:
I think the cheap 298 devices on eBay would work for you. They are
2-channel h-bridge. They actually have 6 inputs; forward, reverse, and
enable for each channel. They will turn a motor from a single PWM
signal, either via the enable input with one direction pin high, one
low, or via a direction input with enable high and opposite direction
low.
That may be so, but indicates a smarter version of the L298 than I tried
to use 20 some years ago, generating a pwm in a pc to drive it with
then, and the thing I most remember is burning my fingers on the heat
sink at 12 volts applied dc. The motor didn't fair much better, no
current regulation resistor change made any diff. Fooled with it for
about a week, made up my mind it would never find a home in any of my
stuff. 3 of them acted exactly the same. And it hasn't. They went out
with the trash. A year or so later I had bought the hf micro mill, and
while looking for motor drivers found the 2M542, bought 5 of them so I'd
have a spare. So far I have bought 9 of them, and nearly 20 years later,
they are all working like new right now. Zero failures=no regrets.
Cheers, Gene Heskett
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