Re: New technique: three position piston control

In lugnet.technic, Kevin L. Clague wrote:
> In lugnet.technic, Mark Bellis wrote:
>
> <snip>
>>
>> Interesting stuff!  Should make walkers move more smoothly, with the possibility
>> of more groups of legs.  The trick will then be reversing all the groups, since
>> it was easier with just two, using two polarity reversers.
>>
>> I have a centre-stop mechanism for pneumatic steering for a JCB.  It's not part
>> of an automatic system though, since I don't yet have an application for that.
>
> Was this single or dual piston?

Mark,
  Did I miss your answer on this?
Kev
>
>>
>> Does your centre stop cylinder stop accurately in the same place every time,
>> even under different pressure conditions?  I thought if you put a lot of source
>> pressure into the cylinder it might overshoot the mid-point, whereas with low
>> pressure it would creep up to it.  Accurate repeatable positioning is one of the
>> challenges of this scheme.
>>
>> Mark
>
> Kevin