Re: Hydraulic press and load cells

I don't understand your fear of electronics in combination whit fireworks.
Besides the obvious hazard from sparks in the engine (that is too far away
from the action to cause any problems), I fail to see the risks.
The µ-controller needs a power supply of 5V, 5mA to operate. Add some more
mA's for the LCD/LED display, knobs and the PSI sensor. Hardly enough energy
to create any exciting situasions even if it fails in its most spectacular
way.
Putting the electronics in an airtight box is a good idea, cause it prevents
any dust from messing up the sircuit board (conductive carbon and corrosive
chemicals and so on).
The risk of the electronics "contaminating" any pyrotechnical material, I
would think would be minute.
The benefit, I think is quite clear:
The electronics "know" everything about the press, so all that needs to be
plotted is the desired pressure in PSI (or any other unit for that matter)
and the diameter of the ram to be used. When these variables are fed into
the electronics (through the LCD/LED display and the knobs), the electronics
can, when activated, use the readings from the PSI sensor in the hydraulics
line and it's "knowledge" of the press (piston diameter, sensor calibration
and so on) to calculate how much power needs to be fed into the pump motor.
The pump motor power controller is, of course, located very close to the
pump.
If I wanted to be on the very safe side, I could even use optical isolators
between the controller box on the press and the power controller for the
pump.

If I can get my hands on some cheap large diameter pistons and a pump, I'm
going to build this.


"Andy H <andys_junk_address at yahoo dot com>" <nospam@xxxxxxxxxxxxx> wrote
in message news:e0bvc2hv4uplhrinqi28nghgifpldr2h8g@xxxxxxxxxx
Point noted. I bet he plans on keeping the amplifier, MCU, and
electronic readout for his load cell in a NEMA rated enclosure as
well. <g> His idea is silly and unnecessarily hazardous.


--
Andy H.
"Clean up your workspace or Die..."

On Tue, 01 Aug 2006 13:17:16 GMT, "Lloyd E. Sponenburgh"
<lloydsp@xxxxxxxxxxxxxx> wrote:


The pump is NOT a liability -- it's not in the shop. First, there's the
(possible) electrical danger, however remote in a properly wired
hazardous-location motor. Then, there's the noise. Not in my shop!

The pump is in its own (deliberately) weak concrete bunker (weak, so soft,
so better noise absorption). Hydraulic pressure is piped in.

LLoyd




.

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