Brian Whatcott wrote:

On Sun, 30 Nov 2003 03:43:07 GMT, Rick
wrote:

Brian Whatcott wrote:

A hole in the motor case, for a tube and small bronze bellows,

Don't even need that complication. The existing seal should be adequate
for a compensated system. Drill and tap the casing for a tube fitting
and attach a foot long piece of surgical tubing. Fill the motor with
light biodegradable hydraulic oil, and top off through the tubing. Stick
a rubber plug in the tubing end to seal it and it's done.

Rick

Delightfully simple. Not sure about the long-term compatibility of
latex and hydraulic oil though.

Brian W

So get a length of the clear silicone rubber tubing used in peristaltic
pumps. That stuff is very flexable and has excellent chemical resistance.
My only real concern would be is the motor insulation resistant to the oil
chosen and what is going to happen if its got sintered bearings if they
are running in a bath of potentially the wrong type of oil?
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Brian Whatcott wrote:

Delightfully simple. Not sure about the long-term compatibility of
latex and hydraulic oil though.

Use the silicone version. Used it for years with no problems with 5606
red hydraulic oil.

Rick

Chris wrote:

How would a motor handle the increased turning resistance
caused by the oil filling? Do you think a trolling
motor would survive being oil filled?

If you want to reduce the internal friction to the minimum you "pot" the
armature in epoxy and then machine the excess off to leave a smooth
surface in place of the less than hydrodynamic surface of the original.
Or just leave it alone and not lose enough power to worry about.

Rick

On Sun, 30 Nov 2003 04:30:33 GMT, Brian Whatcott
wrote something
.......and in reply I say!:

There is a grade of "surgical tubing" that is not latex at all, and is
used as fuel lines for model aeroplanes and such. It's blue and
probably nitrile or something like it.

Delightfully simple. Not sure about the long-term compatibility of
latex and hydraulic oil though.

Brian W

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