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Waterproofing 2.6 thrusters for ocean use (bearing upgrade and motor coating)

User-Contributed Guide

User-Contributed Guide

This guide is not managed by the site's staff.

In this guide we used stainless steel and ceramic hybrid bearings to replace the mild steel ones that corrode quickly, and used spray enamel to better protect the motor stators and windings.

  • Author: Paul
  • Difficulty: Moderate

Edit Step 1 Remove the Thrusters  ¶ 

Image 1/3: This is a list of items you will need: [http://www.ebay.com/itm/3x8x4mm-Hybrid-Ceramic-Stainless-Metal-Shield-Bearings-SMR693C-ZZ-A7-Lube-dry-/251485857404?pt=Radio_Control_Parts_Accessories&hash=item3a8db9a67c|3x8x4mm hybrid ceramic stainless steel bearings], [http://www.ebay.com/itm/4pcs-3x7x3-Hybrid-Ceramic-Stainless-Bearing-Lube-Dry-S683C-2OS-A7-/251266452803?pt=BI_Heavy_Equipment_Parts&hash=item3a80a5cd43|3x7x3mm hybrid bearings], Rustoleum crystal clear enamel, assorted punches, soft mallet, and a support for removing bearings (can use two very small pieces of wood to support the stators when you tap out the bearings). Image 2/3: Remove the main plastic body from the chassis by removing all of the o-ring/rubber bands, undoing the reusable zipties and removing the nuts from the two rods. Image 3/3: Remove the propellers and magnets by pulling them off (you must remove the clip for the vertical thruster.)

Edit Step 1 Remove the Thrusters  ¶ 

  • This guide will help you get your standard hobbywing thrusters ready for long term and ocean use. In this picture you can see a before and after of a coated and non coated motors that have both been used in the ocean.

  • This is a list of items you will need: 3x8x4mm hybrid ceramic stainless steel bearings, 3x7x3mm hybrid bearings, Rustoleum crystal clear enamel, assorted punches, soft mallet, and a support for removing bearings (can use two very small pieces of wood to support the stators when you tap out the bearings).

  • Remove the main plastic body from the chassis by removing all of the o-ring/rubber bands, undoing the reusable zipties and removing the nuts from the two rods.

  • Remove the propellers and magnets by pulling them off (you must remove the clip for the vertical thruster.)

  • Remove the 2 allen key set screws on both sides of the motor, and wiggle it out of the mount.

Edit Step 2 Mask and Spray  ¶ 

Image 1/1: Go outside and place the OpenROV on a large cardboard box and use a piece of cut cardboard to shield the rest of the ROV from the overspray.

Edit Step 2 Mask and Spray  ¶ 

  • Use Rust-oleum crystal clear enamel in a spray can.

  • Go outside and place the OpenROV on a large cardboard box and use a piece of cut cardboard to shield the rest of the ROV from the overspray.

Edit Step 3 Remove the Tape and Bearings  ¶ 

Image 1/1: Here is a video of bearing removal: http://www.youtube.com/watch?v=MXyt79raCBs

Edit Step 3 Remove the Tape and Bearings  ¶ 

  • The bearings and select a pin punch that is skinny enough to fit through the center bearing, and has enough room to angle it slightly to punch out he rear bearing.

  • Here is a video of bearing removal: http://www.youtube.com/watch?v=MXyt79raC...

  • Spray on 2 medium coats, wait 10 minutes, then apply 2 more. It is okay if some gets in to the holes for the bearings, it helps them stay in. Try to avoid drips and make sure to cover all windings. If you over apply it, you will need to sand the stators to allow the propeller and housing to fit back on.

  • Replacement is the opposite, gently tap the appropriate bearings into the holes using a soft mallet, the front and back are two different sizes.

Edit Step 4  ¶ 

Image 1/1: Replace the motors in their mounts, the propellers and magnets on the motor, and then mount back into the body and tighten down all of the nuts. Then you are back in business!

Edit Step 4  ¶ 

  • Be sure to dry with canned air and lubricate the bearings with a silicone based spray lubricant (we use the blaster brand silicone spray) before and after each dive, and if going in salt water, give it a fresh water rinse before using the lubricant.

  • Replace the motors in their mounts, the propellers and magnets on the motor, and then mount back into the body and tighten down all of the nuts. Then you are back in business!

  • Please check out our blog http://csuciaarr.wordpress.com

  • Open Explorer: https://openexplorer.com/expedition/csuc...

  • Facebook page: https://www.facebook.com/csuciaarr

You're Done!

One Comment

Can you confirm that the bearings should be dry - with no lube? The bearings I am looking at on eBay are:

3x8x4 Hybrid Ceramic Stainless Bearing Lube Dry S693C 2OS A7

3x7x3 Hybrid Ceramic Stainless Bearing Lube Dry S683C 2OS A7

Also the relevant parts section lists just the 3x7x3 and not the 3x8x4 bearings.

Thanks

Mark Morwood - Reply