Christmas bell

HW needed:

• screws M3x6
• screws M3x10
• 1pc set screw M3x6
• 1pc screw M3x12
• 2pcs nut M3
• 4pcs 608 bearing (8x22x7 mm)
• bell, diameter max 55 mm, height max 65 mm: Aliexpress 1, Aliexpress 2, ČR
• N20 mini motor with gearbox, 6V, 200 RMP: Aliexpress
• 6V DC power source

Optional HW:

• Remote control over WiFi: Sonoff SV WiFi relay switch low voltage: Aliexpress, ČR
• For discontinuous ringing: Cycle Digital Time Delay Relay Trigger: Aliexpress, ČR

Before the print:

• Headstock is made for specific bell. In case you use different bell, some adaptation might be needed.

Print instructions:

• PLA
• 0,2mm or 0,3 mm layer height
• MOTOR_MOUNT, DRIVE_WHEEL, DRIVEN_WHEEL and AXLE with 100% infill
• Use 3 perimeters for stand and headstock.
• Motor is little bit on the noise side when under the load, so I recommend to print MOTOR_MOUNT and MOTOR_HOLDER from softer TPU.

Print postprocessing:

• Remove custom support from STAND_A and DRIVEN_WHEEL.
• Tolerances are tight, so some sanding might be needed. But with well calibrated printer the assembly should be smooth.
• Remove bridging in holes in STAND_A and MOTOR_MOUNT.

Assembly:

• Insert M3 nut into MOTOR_MOUNT, press motor mount onto the motor axle and secure it with M3 set screw.
• Axle assembly – from left to right DRIVE_WHEEL, bearing, STAND_A, bearing, MOTOR_MOUNT:

• Secure position of the DRIVEN_WHEEL with superglue.
• Use M3x12 screw and M3 nut to attach bell to the HEADSTOCK.
• Use M3x6 screws to assembly the rest of the mechanism:

• Mount the MOTOR_HOLDER to the STAND_A using M3x10 screws. Pay attention to the orientation, see image above.
• Optional: use holes in STAND_A together with SPACER to mount Sonoff WiFi relay, use M3x10 screws.
• Optional: use holes in COVER to mount delay relay trigger, use M3x6 screws.
• Do the wiring.
• Put COVER on, use M3x10 screws to secure it to the rest of the assembly.
• Optional: put some rubber feet at the bottom to prevent item from moving on the table.

Happy ringing!