Date: 30/7/2019
Members present: Wei Jing, Yong Keng, Nairong
Venue: MnT Lab
Agenda:
- FINAL PRESENTATION
Date: 29/7/2019
Members present: Wei Jing, Yong Keng, Nairong
Venue: MnT Lab
Agenda:
- finish soldering
- finish assembling everything
- testing with human rider
- taking video
- prepare for final presentation
Date: 28/7/2019
Members present: Wei Jing, Yong Keng, Nairong
Venue: MnT Lab
Agenda:
- fried one Arduino UNO
- fixed the wiring
- started soldering
- prepare for final presentation
- waiting for print to be done
Date: 27/7/2019
Members present: Wei Jing, Yong Keng, Nairong
Venue: MnT Lab
Agenda:
- finished structure assembling
- printed new clamps to fit the structure
- cut the aluminum servo arms to prevent stalling
- printed the middle and back support
Date: 26/7/2019
Members present: Wei Jing, Yong Keng, Nairong
Venue: MnT Lab
Agenda:
- Shopped for more Bluetooth module
- Need to buy velcro tape and inner bracing
- Final assembling is almost done.
- Initialised the positions of the servo motors
- Exploded 2 voltage regulator in the process
Date: 25/7/2019
Members present: Wei Jing, Yong Keng, Nairong
Venue: MnT Lab
Agenda:
- Continue with final assembling
- Fried our Bluetooth module
Date: 23/7/2019
Members present: Nairong
Venue: MnT Lab
Agenda:
- Finish soldering of the electric wheel wires
Date: 22/7/2019
Members present: Nairong
Venue: MnT Lab
Agenda:
- Finalised the structure of final product
- Started final assembling
Date: 19/7/2019
Members present: Wei Jing, Nairong
Venue: MnT Lab
Agenda:
- tested the 2nd pair of electric wheels and made it work
- soldered the long wire to connect the electric wheels to the backpack
- discovered a lot of soldering work to be finished
Date: 18/7/2019
Members present: Wei Jing, Yong Keng, Nairong
Venue: MnT Lab
Agenda:
- bought rubber fitting for the 4 back wheels
- 3D printed the remaining clamps
Date: 17/7/2019
Members present: Wei Jing, Nairong
Venue: MnT Lab
Agenda:
- modified the rest 7 toggle clamps and servo arms, assembled onto the servo motor
- decided to purchase more rect nuts and M5 8mm screws
- building the casing for Tony’s idea
Date: 16/7/2019
Members present: Wei Jing, Yong Keng, Nairong
Venue: MnT Lab
Agenda:
- Update presentation 4
- Configure the blue tooth for remote control of the wheel clamp through a phone App called Roboremo
Date: 15/7/2019
Members present: Wei Jing, Yong Keng, Nairong
Venue: MnT Lab
Agenda:
- Prepare for presentation
- get the prototype ready for presentation
Date: 12/7/2019
Members present: Wei Jing, Yong Keng, Nairong
Venue: MnT Lab
Agenda:
- Made the other side of the wheels: motor connected to the filed clamp
- 3D printed the 2nd gear
- 3D printed 12 corner brackets
Date: 11/7/2019
Members present: Wei Jing, Yong Keng, Nairong
Venue: MnT Lab
Agenda:
- The gear brake’s motor design was used on a 3D printed wheel clamp successfully, the wheel clamp mechanism is now working well
- solder and unsolder the voltage controller, fit it to our circuits. Our system can be powered with the blue pack of battery with suitable power now
- shopped for new wheels and tapping screws
Date: 10/7/2019
Members present: Wei Jing, Yong Keng, Nairong
Venue: MnT Lab
Agenda:
- dismantled the toggle clamp (filed away the rivet) and connected it to the servo arm. Everything is mounted onto the aluminum frame. Connected to the power source and tested successfully. The gear method has proven to work well.
- the corkscrew brake needed Arduino programming to turn 360 degrees.
- the gear brake was successfully Arduino programmed for remote control. Our first working prototype (gear brake) was born!
Date: 9/7/2019
Members present: Wei Jing, Yong Keng, Nairong
Venue: MnT Lab
Agenda:
- 3D printed the gear (pink). Glued it onto the wheel. Connected it to the aluminum frame and toggle clamp successfully
- 3D printed adaptor and clamp for corkscrew brake
Date: 8/7/2019
Members present: Yong Keng, Nairong
Venue: MnT Lab
Agenda:
- Shopped for the rubber brake
- proposed design to apply it onto corkscrew brake, and its own brake system.
- shopped for gear but didn’t find anything, decided to 3D printed the gear brake.
- thread rod for corkscrew brake came
Date: 5/7/2019
Members present: Wei Jing, Yong Keng, Nairong
Venue: MnT Lab
Agenda:
- Tried to motorize our existing ‘wheelchair’ clamp by connecting it to a 3D printed accessory and a servo motor. This was a failed attempt as the force is not strong enough.
- Cut new aluminum frames for our prototype to make it shorter.
- Tony recommended us another promising method, which involves the use of gears that are rigidly fixed onto our existing wheels, and then chocking the gears with a gear stopper. For week 9, we intend to experiment with the ‘corkscrew’ and ‘gear’ method, if everything (delivery of items) runs in order.
Date: 2/7/2019
Members present: Wei Jing, Yong Keng, Nairong
Venue: MnT Lab
Agenda:
- Progress meeting 3 went smoothly
Date: 1/7/2019
Members present: Wei Jing, Yong Keng, Nairong
Venue: MnT Lab
Agenda:
- Prepare for presentation tomorrow
- contacted seller for our components to be delivered
Date: 26/6/2019
Members present: Wei Jing, Yong Keng
Venue: MnT Lab
Agenda:
- Went to HardwareCity to source for longer M8 hex bolts and washers
- 3D-printed spacers for electric wheels but were too big to fit
- Assembled the wheel onto our makeshift truck with new bolts
- Measured dimensions of our circuit board and modelled a casing to be sent for 3D-printing
- Tested the strength of the frame by asking Ziwei to stand on the skates
- The rear wheel bracket was unable to support as it shifted after testing
- Reinforced with another bracket and tested again
- The bracket was pushed down slightly such that it blocked the movement of the wheel
- Drew out preliminary designs to hold battery pack and circuit board
Date: 25/6/2019
Members present: Wei Jing, Yong Keng
Venue: MnT Lab
Agenda:
- Sourced for M8 hex bolts at NBS Hardware
- Purchased 75mm M8 hex bolts
- Assembled electric wheel onto frame to form a 3-wheel drive roller skate
- 2 free wheels mounted on truck in front, electric wheel behind
- Tested out prototype with power supply
- Screws were of a larger size than holes in the brackets
- Drilled larger holes in brackets
- Cut out sections of the bracket to accommodate wire for the electric wheel
- The bolts were too short to assemble the wheel
- Disassembled an older power supply to use the longer M8 bolt
- Problem was that the bolt was not fully threaded so we could not fit the bolt into our design
- Needed spacers so that the wheels did not grind against the brackets
- Tested clamping design with toggle clamp similar to wheelchair clamp
- Toggle clamp is able to stop the free wheels from moving
- Proof-of-concept of the wheel-clamping mechanism
Date: 24/6/2019
Members present: Wei Jing, Yong Keng
Venue: MnT Lab
Agenda:
- Discussed with Dr. Ho about possible designs and mechanisms and updated on our progress and change in direction
- Went to hardware stores in Jurong East to source for components
- Went to a medical supplies store near Ng Teng Fong Hospital to look at wheelchair clamp design which provided inspiration for us to use a wheel clamp to lock our wheels
Date: 21/6/2019
Members present: Wei Jing, Yong Keng
Venue: MnT Lab
Agenda:
- Mounted truck and skateboard wheels onto the frame
- 3D-printed a brake and tested braking system with MG995 servo motor
- Possible, but the servo motor might not be able to provide enough frictional force
- Discussed mechanisms for lowering platforms for retraction system
- Using pneumatic piston to lower platform
- Disadvantages:
- Bulky
- Pneumatic pistons expensive to obtain
- Dangerous as it involves using compressed air tanks, could cause explosion
- Need to refill/replace air tanks very regularly
- Discussed another mechanism to lock wheels
- Using 360° servo motor to unscrew and lower wheel locks to apply normal force to the wheels
- Need to obtain components
- Discussed which components to order online
Date: 20/6/2019
Members present: Wei Jing, Yong Keng
Venue: MnT Lab
Agenda:
- Tested out power drive with power supply
- Soldered the XT60 connector to cables to plug the power drive to the power supply
- Tested power drive with 24V power supply
- Power drive works well, so we decided to use the wheels to power the roller skates
- Went to Decathlon to purchase 2 skateboards with different wheel sizes to test which size is most suitable
- Cut 20×20 aluminium rods and assembled the frame for the roller skates
- Mounted skateboard truck with wheels to the aluminium frame
Date: 19/6/2019
Members present: Wei Jing, Yong Keng
Venue: MnT Lab
Agenda:
- Purchased a pair of inline skates with aluminium frame from Decathlon
- Disassembled aluminium frame from inline skates
- 3D-printed a “hook” and tested wheel-locking with hook
- Hook was able to enter the gap in the frame
- Needs to be smaller sized to be more effective
- Brainstormed ideas for wheel-locking mechanism
- Install servo motors by the sides to rotate the hook into the gaps
- Problems encountered: there is not enough space to install the servo motors
- Preliminary calculations showed that the 3D-printed plastic hook was not reliable for the locking mechanism as it might be too brittle
- Discussed a major change in the direction of our project
- Since the electric wheels have arrived we have decided to proceed doing the electric skates first before adding the wheel-locking/retraction system
- Discussed possible directions of our project:
- Making wheel-locking mechanism instead of retractable
- Simpler concept and more practical
- Wheel retraction system
- Instructor commented that it was better for us to design and print our own frame
- However plastic was not strong enough to support human weight
- MnT lab does not have the facilities to custom-make our inline skate frame
- Electric skates/skateboard
- Already obtained power drive
- Implement wheel-locking/retraction mechanism/other modifications
- Making wheel-locking mechanism instead of retractable
Date: 18/6/2019
Members present: Wei Jing, Yong Keng
Venue: MnT Lab
Agenda:
-
-
- 3D-printed a frame for inline skate wheels using dimensions measured from the inline skates we bought
- Experimented with the wheel-locking design
- Jamming a rod in between wheels to act like a doorstop
- Decided to go with “hook” design to jam wheels as there is space in the frame to insert the hook
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Date: 14/6/2019
Members present: Wei Jing, Nairong
Venue: MnT Lab
Agenda:
-
-
- Model the inline skate frame in Solidworks
- Study the mechanism of toggle clamp
- Design the “wheel chock” to be fitted on to the skates with toggle clamp
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Date: 13/6/2019
Members present: Wei Jing, Nairong
Venue: MnT Lab
Agenda:
-
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- Tested wheel-locking experience with wire strap, turned out to be difficult to walk on inline skates
- Bought new aluminum quad skates
- Measure dimensions on the inline skates
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Date: 12/6/2019
Members present: Wei Jing, Nairong
Venue: MnT Lab
Agenda:
-
-
- Approached Tony for consultation
- Discussed mechanisms for the wheel-locking and retraction designs
- Discussed items to purchase
- Purchased inline skates, servo motors, power drive, quad skates
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Tasks to be completed:
-
-
- Dismantling of inline skates
- Motion study of wheel-locking mechanism on Solidworks
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Date: 29/5/2019
Venue: Crescent Hall TV lounge
Members present: All
Agenda:
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- confirmation of the idea of building a retractable roller skate
- obtained inspiration from existing products
- listed a shopping list