Technic gears investigation

Completion date: April 15, 2020

I mixed the Banbao and Lego and put together 3 combinations of gears. I followed a book.

Simple 4:4

Simple 24:24
http://youtu.be/-QZZCqQopKo

Simple 12:12

https://youtu.be/wQlkjvK4YM0

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Python script - pop-up reminder based on data from Excel

Completion date: December 17, 2018 Changes to the script (Dec 14 2018): 1. Used Date format to compare dates. 2. Show message for update AR if the date is overdue and due today. Changes to the script (Dec 17 2018): 1. Corrected the ws.max_row+1 to ws.max_row. 2. Changed to loop from bottom up (so the the newest records gets checked first) =========== The script =========== #! python3 -- Modified on Dec 17 2018 import openpyxl import tkinter.messagebox from datetime import date import os #Get the workbook, worksheet file = "AR.xlsx" wb = openpyxl.load_workbook(file) ws = wb['Sheet1'] #Iterate through the rows of column "Next update on" = Column D = 4, from bottom up (the newest record to oldest) for i in range(ws.max_row, 2, -1): next_update_datetime = ws.cell(row=i, column=4).value if (next_update_datetime is n...

Gear investigation: Banbao Lego crane

Completion date: May 16, 2020 1. Gear ratio: 8:24:40. The bottom wheel cranking the string at speed (8/24)*(24/40)=0.2x speed of the motor. 2. The top two wheels looks like pulley system to me, but I am not sure about the spinning speed of the top wheels, the first top wheel is slower than the bottom wheeler, that I observed. 3. The beginning of the bottom wheeling action is pulling less string because the circumference is small (less string winded). So it pulls the string faster gradually as more string is added to the circumference. 4. Note I added the rewind crank on the other side of the motor. This is the final instruction of the Banbao booklet. All the builds have been fun for me, I got to know more about gears now (though still primitive). My thoughts towards the gear mechanism is that it is not as efficient as I thought it would be. - requires many gears to do 1 simple thing - gear design has to match the many requirements of the space, dist...

Gear investigation: Klutz Lego Blender

Completion Date: May 31, 2020 After I finished with Banbao gears collection, I search on web for other building instructions. I came across the Klutz Lego and saw the picture that I just built from looking at it. It was quite easy and fast, however, I would like to convert it to vertical winding, but I don’t know how yet. So here is the original one. Gear ratio is 40:8=40:24 = (40/8)*(40/24)=8.3 times faster then the hand-winding motion.

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