Introduction
You should have a good understanding of how acrylic cement works at this point. We are now going to introduce the use of epoxy. The epoxy acts as a barrier to the water and allows wires to "pass through" the endcaps.
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The endcaps have a large surface area that needs to be cemented together.
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The best method of cementing the endcap parts together is as follows:
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Note: These pieces are for demonstration purposes only. While holding one side, place the needle of the applicator between the two surfaces to be cemented.
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Add a liberal amount of cement. The goal is to have cement completely filling the gap between the surfaces. Any excess or spills will evaporate quickly or can be wiped away.
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Apply slight pressure with both hands while the cement cures.
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Add acrylic cement around the entire edge of the newly cemented parts to ensure that they are completely joined.
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Clean any excess off with a paper towel or cloth.
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You will use epoxy to create permanent waterproofing for the endcaps. There are a few things you want to keep in mind:
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The epoxy has two parts that mix in the nozzle to get an even distribution.
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Before you open the tube hold it upside down to allow the air bubble to travel to the top. Air mixed in the epoxy can cause issues.
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Remove the cap, as well as the tip and then install the mixing nozzle.
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The first part of the epoxy might not be properly mixed so squirt out a little to make sure that the epoxy you do use is evenly mixed.
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12 Comments
HELP!!!! STEP 11 is confusing me!!! We don't have any endcap pieces that look like the ones in that picture. I'm starting to think that the illustrations from STEP 11 are from an earlier (maybe a 2.6???) version of the OpenROV. Can someone please confirm this?
We don't want to continue if we are missing pieces needed for our build
Those pieces in Step 11 are for demonstration purposes only to explain the concept. Starting at Step 12 you should have all of those parts (yours will be clear though instead of smoked colored). -Brian G.
I had to do some tipping to get theair bubbles out of the wire wet port. By taping off the connector side hole and tipping the air bubble to the wire side I was able to inject a second time which pushed all the air out. Next time I would inject from the bottom with the angular side upwards.
Thank you for the feedback! -Brian G.
Step 32 Is there a good technique to assure these pieces are centered on the syringe? The previous section used the motor shaft to assure alignment, but that isn't an option here. The hole diameter on the larger pieces is much bigger than the syringe, so using the syringe as an alignment jig won't work either.