RMG QD Mold for BlueROV2 Tether Blue Robotics

thingiverse

This is a mold for terminating Blue Robotics tether (4mm slim shown, but standard 7.6mm file is also included) onto an RMG-2-FS cable so that the tether may be easily disconnected from the ROV. Should be able to get the QD swap done for around $150. The mating RMG-2-MP connector is potted into a black Blue Robotics cable penetrator as normal. Leave at least a couple/few inches of cable so that it may flex in use. Don't forget to order the G-FLS-D and G-MLS-D locking sleeves. Potting material used here is Scotchcast 2131. Follow the instructions. Squeeze one half of the bag to push the material into the other half of the bag. Mix by squeezing back and forth for 30 seconds, then quickly cut a tiny corner of the bag exposing a 1/16" hole and slowly pour from a foot high if you can. Pour carefully, it's thin at first and starts to thicken pretty fast, so you only have maybe 3min to get it poured after the 30 seconds of mixing. It's really important to pour a thin string slowly so that it doesn't pool on top too early because that will trap air inside. Start at one end and let it work its way down so it floods at the bottom and fills its way to the top bringing the air with it. After you've poured, keep an eye on it for about 15min and pop any bubbles that rise to the surface. Mold release used was Sprayon MR311. Spray the inside of the 3d printed mold fixture only. Do not spray the RMG connector, or let any overspray get on the connector, or get on the tether. Let it dry before pouring. It dries fast. Use a little dental floss to keep the kevlar strands from fraying out too far. With a sharp razor blade, shave down the RMG connector to a point as shown. Be careful not to cut into the wire jacket. Cut out any filler inside so it's just the two wires being potted. There's no wire orientation, so you can connect them white to blue/white and black to blue, or the other way around, doesn't matter. Clean the RMG connector and tether and wires with acetone before potting. If you use alcohol instead of acetone, you'll have to scuff everything with scotchpad or sandpaper and it's much easier to just use acetone. I know, acetone sucks, but...use acetone. Nothing special about the print settings. Whatever infill you like, medium quality, etc. Consider them one-time use. Make sure to mirror the other half.