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Hi Frank,
As the piston moves out it will cause a vaccum in the actuator body that
needs to be filled
with oil, & similtaneously the bellows will be moving out & require
more oil in them.
Are you having a fairly large bladder for this purpose.
Also I deecided to go with silicone for compensation as I found that WD40
disolved some
plastics & the inside of the linear actuator had a number of differant
plastics in it.
Another thing I've done is poke a needle hole in an apropriate place in the
two micro switches
that stop the travel of the piston to help equalize them, as I thought with
the air cavity inside
them they had the potention to trigger randomly as the oil pressure builds
up with depth.
Fortunately Wiki had a diagram of an identical micro switch to mine to help
with the operation.
I was going to try mine without belows first but may have to go with your
idea.
Alan
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