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Re: [PSUBS-MAILIST] RimTec Magnetic Clutches



Or I could just encase the magnetic reed switch in acrylic like Andy did the LED's instead of trying to rig it inside a small skinny piece of pvc pipe.
 
Just thought of that.
 
Bill.
 
 
----- Original Message -----
From: Akins
Sent: Monday, October 24, 2005 11:37 AM
Subject: Re: [PSUBS-MAILIST] RimTec Magnetic Clutches

Hi Byron.
 
I have a completely wet, dual cockpits, wetsub Byron, it isn't ambient. I already have my minnkota mounted to the hull using
 
a motor mount I made from an old stop sign I cut and bent. If you would like to see my sub's set up you have to belong to yahoo because the
 
pictures are at my yahoo group site at this link.... http://groups.yahoo.com/group/The_Warbird_Recovery_Team/  once you get there and sign in to yahoo,
 
just click on the "photos" section on the left of the page in the yellow column and the album is the first one called "my two person wetsub".
 
Thanks for the info on the hydraulic thrusters but I've already got my minnkota motor mounted. I just need to decide whether to oil or air equalize it.
 
Right now I am on the hunt for magnetic variable speed reed switches to activate the relay to the motor. One thing I am wondering
 
about is WHY do I even need a relay solenoid? Why couldn't I just wire it direct from the battery to the switch and then to the motor? Does it have
 
something to do with too high a voltage or amps going thru the switch and that is not good or something like that? I'm not real good at the
 
electrical stuff. Also I am wondering how a magnetic switch could possibly be variable if it just clicked in a solenoid relay?
 
As you suggested I have talked to some of the ROV guys. I am a member of the yahoo group called "Robotrov"  at this link......
 
http://groups.yahoo.com/group/robotrov/?yguid=204005530     which is a group for robotics and ROV's. Unfortunately even though one of them
 
responded to my post at the group, his link and info did not lead me to switches I need. His link sent me to a site with electronic circuit boards
 
that would be used inside a sealed unit in a ROV for instance. I need something small and compact that I can use either in the cockpit or attached
 
to the joystick in my wetsub. I thought about using a mercury switch and rigging it so that I could just turn it to make contact. If the attitude of my
 
sub was always horizontal that wouldn't be a problem but if things got a bit murky underwater and the sub was not horizontal and I got disoriented the mercury
 
switch might make contact when I did not want it to. So I decided to not use it and to continue to try and locate the magnetic reed switches.
 
Ideally I would like to find a magnetic reed switch that was already waterproof and sealed, but if I can't find one waterproofed, I could rig it up in
 
a real small piece of pvc pipe I guess.
 
Bill.
 
 
 
 
----- Original Message -----
Sent: Monday, October 24, 2005 5:57 AM
Subject: Re: [PSUBS-MAILIST] RimTec Magnetic Clutches

Have you thought of talking to some of the thruster guys?  All of  the ROV's out there ( except el-cheapo cheapo toys) have some external thrusters.   They are almost always electric.  I worked for Deep  Sea Systems, Inc. as a consultant for about six months, and have been friends with Chris  Nicholson (owner/pres) for twenty years.    If you can catch Chris's imagination, he can be a world of help.  He builds and sells electric thrusters.
 
Innovatum is another group.
 
Slightly different subject, but I gotta ask:
 
Have you considered hydraulic thruster motors?  You keep the pump inside the sub and use through-hull fittings to run hydraulic motors outside.    Putting a piece of  pipe fitting through a sub wall for hydraulic hoses is lots easier than either electric feed-throughs or a shaftdrive with a stuffing gland.
 
Or bite the bullet, use the stuffing gland or o-rings on the spinning motor shaft, design for drips and put a small bilge pump under it venting overboard.  Need a good check valve and a stout pump for ambient, but its doable.