Skip to main content

Gear investigation : Banbao LEGO airplane




Running on ground


Motion not too smooth



Completion date: April 30, 2020

Observations
1. Motor to propeller is 24=40=40:24:16.   So propeller is running 1.5 times faster than the motor (24/16=1.5)
2. Motor to wheels is 24=40=40:24. Same speed.
3. The belt can be used to pass on the same speed from one gear to another, and these gears would move in the same direction. The belt can also be used to pass the motion over a longer distance.
4. The axle can be used to pass on the same speed and same direction of the gear on the same axle. Also, the axle can be used to displace the motion to another gear on the same axle.
5. One gear can invoke motions on multiple gears.
6. Gear’s direction can change from left/right motion to become front/back motion by using a direction-changing gear.  While this is happening, the difference in gear sizes can speed up (or slow down) the next set of gear motions.

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