Subject: FW: Aberdeen Bridge Test
Date: Fri, 28 Jan 2000 17:59:33 -0600
From: "Kaufman, Tom" <Tom.Kaufman@mts.com>
To: "Larson, Rod" <Rod.Larson@mts.com>

Enclosed cost sheet, I missed with first email.  Tom K.
 <<servovalve.compare.xls>>

> -----Original Message-----
> From: Kaufman, Tom
> Sent: Friday, January 28, 2000 5:52 PM
> To:   Larson, Rod
> Subject:      Aberdeen Bridge Test
>
> Rod:
> The loading curves you did for me have an important piece of
> information.  It shows the rise time(velocity) needed for each of the
> actuators.
> This servo-valve flow is then easy to find.  My conclusion is that the
> 60 GPM Moog valves would be too small.
> They would almost meet the flow for tension side, but the flow out of
> the compression side would cause too high of a pressure drop over the
> S/v.  (If we slowed down the time for center cycles, we push the
> higher velocity cycles outward toward ends(with shorter strokes).  We
> still end up with higher velocities than the 60 GPM valve can handle).
>
> Therefore I would like to use the normal 90 GPM 256.09.  I did my best
> to check the costs, and it looks like we can save over 10K by using
> the bigger valves.  It means that you will need to use (18) 497.15
> valve drivers, and this adds one more 497.01 chassis.  I looked at a
> normal vertical rack, and it looks like we still have plenty of room
> for (4) 497.01 chassis and the 498 box.  Let me know if you see
> something that is a show-stopper.
> On Monday next week, I plan to give the actuator group the go-ahead to
> complete BOM's with the 256.09 valve.
>
> Another issue:  What temposonic do you want in the actuator.
> Digital--or analog?  When I did my count of transducer modules, I
> assumed we would have a module for the tempo, but I did not know if
> this is really needed.  What is really needed????   If digital, do we
> need any 497 module?
> Tom K.

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