Re: [CAD_CAM_EDM_DRO] hydralic bed control

Disclaimer: I haven't done specifically what you ask about, and I don't
know how much backlash is present in a hydraulic system.

If I were going to attempt this, and not a lot of people had said it
wouldn't work, here is what I'd do.

1. No power steering pump. Hydraulic pumps are less than $100 and will
last longer, run cooler, and provide more stable volume.
Get them from Grainger or Princess Auto(The catalog, not the web store)

2. Linear encoders provide feedback to the Controller. This will have to
be a closed-loop system

3. Electrically controlled variable rate hydraulic valves.

With the proper controls, it wouldn't seem to be very different from a servo
system.




----Original Message Follows----
From: dave engvall <dengvall@...>
Reply-To: CAD_CAM_EDM_DRO@egroups.com
To: CAD <CAD_CAM_EDM_DRO@egroups.com>
Subject: [CAD_CAM_EDM_DRO] hydralic bed control
Date: Sat, 29 Jul 2000 07:38:06 -0700

Hi,
I have an old horizontal mill with a hydralic bed. Has anyone tried
control of anything hydralic using a automotive power steering unit?

Dave


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