Blue Robotics (BR) used to sell a kit to adapt their T100 Thrusters and M100 brushless motors to the OpenROV 2.7 and earlier versions. Since I love a challenge, I decided to see if I could adapt the BR M100 motors to both the horizontal and vertical motor positions on the OpenROV 2.8. It turns out it can be done with a little drilling and reaming.
BR used an adapter to mount the vertical motor on the OpenROV 2.7 chassis and the adapter can still be used to mount the BR M100 motor on the 2.8 chassis by drilling two additional holes in the vertical motor mount. Below is a picture of the modified vertical motor mount:
The three holes closest to the “T” are the original holes and the two holes farthest from the “T” are the additional two holes used to mount the motor adapter along with the hole at the top of the “T”. The two additional holes are the same diameter as the original hole at the top of the “T”.
To mount the M100 motors at the same horizontal locations as the DST-700 I found that I did not need to use the motor adapter used to mount the vertical M100 motor and could mount the M100 motor directly on the Vertical Motor Mount structure. Below is a picture of the modified Vertical Motor Mount structure:
To mount the M100 motor directly on the Vertical Motor Mount structure I had to open up the original motor mount center hole to a diameter of 0.450 inches and the two adjacent horizontal mounting holes on either side of the center hole to a diameter of 0.149 inches to provide clearance for the two M3X12 mm stainless steel hex machine screws used to attach the M100 motor to the Vertical Motor Mount structure.
Once I get the Vertical Motor Mount structure assembled, I will provide pictures of the M100 motors in the vertical and horizontal motor mount positions.