Recent content by madacho

alright, I found out that the actual holding torque required really isn't much, like sub-30 oz.-in. I think the main issue will be the friction caused by the O-rings, but hopefully that'll be lessened by some good lubrication. I just hope that it'll keep the servo waterproof... Thanks for the...

and how would the fact that its underwater and that the servo will have to be able to turn through the o-rings friction factor in? again, i don't want to order a servo that will not be able to budge it, but not get an overly expensive/heavy one either. and the whole purpose of servos is the...

yea i guess so... but i think I am just gunna go with the quick and easy method for the sake of time but what I really need to know is how strong of a servo motor i need to get... i don't want to make all the waterproofing only to find out the servo won't be able to move the shaft +...

im still not getting the slip ring deal... the whole shaft will be rotating as well, so how would keeping the wire inside the shaft rotating with it help anything? the other end is going to be directly connected with the servo motor at this point, since i only have a month now to finish, i...

Oh well I guess you can't see it because the diagramis a front view, but there is a bilge pump motor that will be spinning the propeller And yes, the azimuth thruster is what I'm going for And the wire will get twisted around the shaft since the thruster will be rotatng but the wire will be...

sorry that my knowledge of engineering terms is low, but I am not sure what you mean by azimuth, haha basically, the thruster itself is one assembly. then, it is attached to a waterproofed servo motor, which will rotate the entire thruster in one axis only. so itll be able to provide thrust...

hmmm a slip ring should be just what i need... but i still need a calculation for the torque... i don't want to buy a servo motor and see that it can't take the weight of the motor but that being said, its not going to be supporting the entire weight of it, right? since there will be that seal...

ah dang, i was using photobucket. ok hopefully thisll work

ok here is a really simple diagram i drew up in paint... and i also realized an issue with the wires... if it keeps spinning, the wires will wrap around and get tangled... i guess i will have to make sure it can only go from 0 to 360 and not complete more than one full rotation thanks!

I'm trying to figure out how much a servo motor would have to hold in terms of holding torque, but how would I calculate this? It will be for a horizontally placed thruster, and the servo motor will be able to turn it 360 degrees... and this will all be underwater. The thruster itself is...

yea, its going to be slow occasional movement... a stepper or servo motor that adjusts the angle of the thruster from like 90 degrees, 45 degrees, etc... its not going to be as fast as like the thruster itself, and its not going to be constantly in motion how would i turn a groove on the inside...

I asked another question in a previous thread, but this is a new issue so here's a new thread: Basically I need to design some kind of waterproof shaft seal for the use of an underwater ROV. Following some earlier advice, I looked into the Parker O-ring Handbook and found the easiest way is...

ok ill try to find that, and order some reliable stepper motors too. our school mainly has solidworks, but I've more or less used the stress test feature before so hopefully i can figure it out. the project is due by the end of March, so hopefully I can pull this together quickly. thanks!

hmmm that could work... any ideas as to how to make a waterproof seal though? or what stepper motors to use? thanks

Hey, I'm in charge of the propulsion component of our school's ROV team, and I was thinking of having just two thrusters on the entire ROV that are able to rotate (preferably) a full 360 degrees, so that it can turn, strafe, move up and down, etc... all with only two thrusters. My first idea...