SAB Goblin Kraken 700 tri-blade tracking ring - perfect zero pitch.

thingiverse

I drew up and printed this ring that will verify your swash is flat and that each blade grip is flat for perfect blade tracking. I made this for my Goblin 700 Havok edition. It should also work for a tri-blade Kraken or Raw 700. It is for grips with 14mm root spacing. Before using it you would ensure your servo arms are at 90, your swash is level and you've gotten your grips as close to flat at zero pitch. I am using Ikon/Brain FBL's so I use the Wizard swash config panel that holds the swash at 0 degrees pitch. Once at that step you fit the ring. If the grips are not perfectly flat you will hear your servos buzzing. Adjust each turnbuckle so there is no buzz. If you then spin the head you should hear no buzzing through a full rotation. If you do your swash is likely not level. When using the ring you will find it only takes a small adjustment of the turnbuckles to hear the servos start to buzz if not aligned perfectly, this appears to be a simple but extremely precise method to have perfect tracking. All of my turnbuckles were close before using a digital pitch gauge but this dialed them in perfectly. Looking at flight log vibrations before and after you can see the difference as vibes are now extremely low. Obviously if you have the ring fitted you don't want the servos to attempt to move at all as they are locked in place. Do not power up a heli with the ring fitted or touch the pitch adjustment! The ring is 226mm in diameter but will still work/fit if you shrink the X and Y to 220mm in your slicer if that is the size limit of your printer(such as an Ender 5). Just don't change the thickness(14mm) as it needs to be a proper wedge fit into the grips.