Đồng hồ Dạy học

Update 2023-Nov-20

• Modified gears to reduce drag resulting in a much smoother operation.
• Modified minute hand to fit drive shaft tighter, reducing backlash.
• Modified drive shaft to better fit the case.
• All modified files are marked V2.

For those just wanting to update a clock, print the following parts:

• Gear Train: upper and lower idler gears, upper and lower drive gear, drive shaft.
• Minute Hand 

Original Post:

• This is a remix of the Robust Teaching Clock over on Thingiverse.
• Gears were updated with spur gears generated by Fusion 360.
• Face updated with two options: inlaid or raised markings.
• Drive gears update with “D” shaft to ensure proper assembly.
• Assembly alignment dots added to ensure proper gear placement.
• About 9 hours total print time.
   

Printing:

• Layer Height: 0.2mm
• Perimeters: 3
• Infill: 15% rectilinear
• Supports: no
• Rafts: No
• Elephant's Foot Compensation: Set to Zero for the inlaid minute marks.

Assembly:

• Screws required:  8 M3-10 socket head or M3-12 Flat Head.
• Refer to the assembly.pdf for additional details.

Post Processing:

• Inlaid pieces are glued in place with thin CA (super glue) applied with a 25 gauge blunt tip needle dispenser.
  • Blunt Tip Needle
    https://www.amazon.com/dp/B07MTCBF2H/ref=cm_sw_em_r_mt_dp_ZZC2XQTQYYFYXYWP20Z2?_encoding=UTF8&psc=1
  • Stick Fast CA glue
    https://www.amazon.com/dp/B009356B92/ref=cm_sw_em_r_mt_dp_FK49YRGJGMEWF579K0JK