Skip to main content

Banbao LEGO: motorcycle


Completion date: April 14, 2020
My banbao LEGO is here! My first project is building motorcycle from manual.

My reflection on this build
- three gears linear cluster turns the gears in a way that the 1st and 3rd gears are in the same direction. 
- the 3-gear cluster’s function is to displace the turning motion to happen in another place. In this case, the back wheels can’t be directly connected to the motor, that’s why the 3-gear cluster would help. 
- there are two types of connectors that look similar but provide a bit different functions. They act as pivot. One is smooth-pivot, the other is a stuck-pivot (need more force to turn)

My first encounter with Banbao: really happy. 
- It is not as good as LEGO in the fitting
- It is really cheap, I imagine this would cost around HK$1000 with LEGO. Now around 1/3 of the price
- It seems there are more variety of parts than LEGO
- LEGO has actual size illustration on page for axles. Banbao could provide ruler sticker as a quick fix. 

Comments

Post a Comment

Popular posts from this blog

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...
Post a Comment
Read more

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...
Post a Comment
Read more

Fixing of retractable badge holder

Completion date: October 2, 2021 My retractable badge holder’s string is thinning and would be broken soon.   I cut it short.  Pull the rotten part out with a tweezer. Insert the string from this end.  Tie a knot.   Reinstall the silver triangle back. 
Post a Comment
Read more