Yes, I would be surprised of those cylinders were not special.

I remember seeing those machines at GM when I used to work there years ago.

They could really beat a car's suspension up and they would run them for 
days and days to see if stuff would break, tear out, wear out,  etc.

They were really quite violent.    I bet that hydraulic power system has 
a bunch of accumulators for super fast flow response.

Another one:
https://www.youtube.com/watch?v=paT-JNWWV-w
Looks like they have the servo valves mounted right on the cylinders for 
minimum response time..

Dave


On 11/9/2015 11:00 AM, andy pugh wrote:
> On 9 November 2015 at 15:32, Dave Cole <linuxcncro...@gmail.com> wrote:
>> I've done quite a bit of hydraulic servo work for custom machines.
>> You can use regular industrial cylinders for positioning.
> I imagine that the reason that fatigue testing machines use
> hydrostatic cylinders is that they want to be fatigue testing
> machines, not hydraulic cylinder seal testing machines.
>

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