Not offhand, but it can be purchased as a commodity and scrutinized if
needed. There's a hydraulics shop around 56th and San Pablo and I stopped
in once to chat and the people were friendly and helpful.
Here's canbus to usb for $10, bluetooth is also available, arduino may be
just around the corner from this. Latency would hopefully not be too large
to preclude usefulness for control purposes:
On Wed, May 22, 2013 at 2:14 PM, Hol Gaskill <hol(a)gaskill.com> wrote:
alot of car sensors are analog voltage or current
straight into the ECU,
though i commend your interest in CANbus and would like to put something
together involving it if there's a chance
do you know offhand what they use as a corrosion inhibitor?
May 22, 2013 02:01:02 PM, di.franco(a)aya.yale.edu wrote:
Hydro stuff sounds good. Don't let you stop me though.
Water is also an option for hydraulic
fluid, ironically enough, when
properly purified and with a bit of additive.
As for car ECU tinkering, finding
something that uses can bus may be a
good option since signals are standard and interface hardware is cheap and
ubiquitous.
On May 22, 2013 1:53 PM, "Hol Gaskill" hol(a)gaskill.com> wrote:
I think before jumping headlong into potentially a $10k project, we should
figure out how to put together a hydraulic system. For the basics of fluid
control, pneumatics are very cheap and simple compared to hydraulic
systems. There is a compressor at the shop, and I have a small air
cylinder we could use to do some closed-loop actuation tests. Also a few
24V air valves, and I'll be ordering a 24V - 15A power supply and some more
air equipment that should round out the required bill of materials when i
get back in town. So a quick and dirty control project using pneumatics
would be very beneficial for us even though the behavior is alot spongier
due to the compressibility of air. Afterall, that's what they used for
robot air hockey.
One we get the taste of controlling valves
to actuate 2-way cylinders
and/or motors, we can raise funds for a 12V hydraulic power unit which can
be had for about $300 including reservoir and some valving. From there all
we need is some hose and tubing, and I propose both a piston (~$60) and a
motor (~150) so we can gain experience with the whole power loop needed for
various projects. This is applicable to the CEB press, reverse trike,
rocket thrust vectoring, well drilling, you name it. Just getting this
basic technology under our belts would be pretty sweet and informative for
alot of our people. I bet we could build a small drill rig for under a
thousand bucks - groundwater harvesting, foundation drilling, secret
stashing of cannon, plenty of options there. Anyway, just getting started
is going to be a task of its own and I would propose picking something with
a relatively short design-build-redesign cycle so we feel rewarded at
regular intervals with a working machin
e.
On safety, I'm looking into veggie oil
etc as hydraulic fluid since that
stuff can be pretty nasty. Below are some links.
Biodegradable hydraulic fluid:
http://www.research.psu.edu/capabilities/documents/biohydraulic.pdf
more info on different biofluid products:
http://www.technologylubricants.com/Technical/Rexroth_90221_1.pdf
On another note, I returned my car to an
operational state recently and
having never worked on a car (this was my first time to even change my own
oil) it was interesting to open the hood with a freshly installed knowledge
of some of the components, and actually feel like I had a rough idea of
what was going on and how to debug the mechanical/electrical problems that
I encountered. A cool project if we ever do incorporate an internal
combustion engine would be a custom ECU using whatever standard automotive
sensors etc we can get off the shelf and some creative 8-bit math. Any
objections to designing around second-hand 90's volvo components?
Cheers,
Hol
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