<html>
<head>
<meta content="text/html; charset=ISO-8859-1"
http-equiv="Content-Type">
</head>
<body bgcolor="#FFFFFF" text="#000000">
<div class="moz-cite-prefix">A picture is worth a thousand words, so
please find attached a drawing of something similar. This is not
a ROV manipulator, but rather a concept drawing I did many years
ago for a controllable pitch mechanism for a low speed wind
turbine, but the idea is the same. The drawing shows only the
inner slip ring. The outer one would be smooth on the inside,
with oil delivered at the appropriate locations via hoses plumbed
to the outside, and in this particular case, the inner ring has a
taper for mating to a tapered shaft on the drive motor.<br>
<br>
Sean<br>
<br>
<br>
On 2014-05-30 21:53, Sean T. Stevenson via Personal_Submersibles
wrote:<br>
</div>
<blockquote cite="mid:53895221.80003@telus.net" type="cite">
<meta content="text/html; charset=ISO-8859-1"
http-equiv="Content-Type">
<div class="moz-cite-prefix">Full continuous rotation isn't that
complicated, other than one part which needs be machined with
O-ring grooves, oil channels and a shaft connection (taper,
spline or keyway). Use a small hydraulic motor connected to the
end of the arm, recessed into an outer slip ring. The motor can
be connected traditionally with hoses for supply and return.
The inner slip ring connects to the motor shaft and seals to the
outer slip ring with o-rings. For a wrist with only one
function downstream (jaw open and close), you'll need three
O-rings, creating two oil channels in between. If you need
more functions, just keep adding channels / o-rings. If you
secure the inner slip ring to the motor shaft with a nut, that
central cavity in the inner slip ring can become the cylinder
that operates the jaw - just drop a cap over it to seal it off
from the motor shaft, and install a piston and outer cap. Then
plumbing the cylinder is as simple as drilling a hole through
the inner slip ring, connecting each end of the cylinder cavity
to its corresponding oil channel on the outside.<br>
<br>
Sean<br>
</div>
</blockquote>
<br>
</body>
</html>