3D printed plastic thrust ring designed to be bonded to a 38mm O.D. single-use motor casing for motor retention.
To use, the nozzle is installed in the casing and epoxy is dispensed into the gap between the nozzle and the case until the level of epoxy rises to just below the end of the case. The thrust ring is then placed over the nozzle and pushed onto the end of the case until fully seated. The inner ring becomes embedded in the epoxy when cured, and the slight angle in the inner ring creates a physical restriction that prevents it from being ejected under pressure. As the thrust ring is pushed onto the case, the inner ring displaces some of the epoxy adhesive upward into the gap between the ring and the nozzle, increasing the length of the bond. Epoxy also flows into the gap between the inner ring and the case. This epoxy is allowed to cure before proceeding to the next (optional) step.
Most of the inside length of the outer ring is designed to be slightly larger than the case which allows the application of thin cyanoacrylate glue (CA) to wick into the gap, strengthening the adhesion of the ring to the case (this could be considered a redundant or back-up method of retention). Note: A small portion (about 1/16”) of the inside length of the outer ring is made in the same diameter as the case, which allows a snap or friction fit of the ring onto the last 1/16” or so of the case. This is important to secure the ring onto the case during assembly and prevent it from moving while the epoxy is curing.
Compatible with Aero Pack and other brand quick-change motor retainers. Patent Pending.