I’m working on a compact test rig where I need to mount a NEMA 17 stepper motor onto a 2 mm thick aluminum sheet (EN AW-5754). The base has to stay as light as possible, so I’d rather avoid thickening it, but I’m concerned about vibration and flex during operation (max 1500 RPM, light axial load, belt-driven). Right now I’m using M3 screws and standoffs, but I’m getting slight resonance. Would switching to rivet nuts or reinforcing the area with a local bracket help more than simply increasing the thickness? I’m open to fabrication-friendly solutions since this needs to be repeatable for a small batch.
Thanks