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Re: [PSUBS-MAILIST] linear actuators



It may be the viscosity, rather than the brushes. Brushed motors have run well in oil for decades. Is there any way to add a little tension to the brush spring?
Vance



-----Original Message-----
From: Alan James <alanjames@xtra.co.nz>
To: personal_submersibles@psubs.org
Sent: Sun, Sep 12, 2010 6:10 am
Subject: [PSUBS-MAILIST] linear actuators

Hi all,
I just filled a linear actuator motor up with baby oil (mineral oil)
to see how it went. It was running rough. It would run consistently
but jerky, it ran slightly better in reverse.
It occurred to me that most electric linear actuator motors were probably
brushed DC & wouldn't run that well with oil compensation.
I used the mineral oil instead of the WD40 (wich is more commonly used
in larger motors), because in experiments I found  WD40 dissolved some
plastics in time, & there were plastic components in my actuators that it might effect.
Not sure where to go with this one. Hydraulics?
Alan