Project Status
Week of 02-27-19
Project is: ON TRACK
The project is still on track, although we will need to order the PCB soon to be able to stay on track.
Issues / Extra progress from last week:
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Acquired material for rear sprocket
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Started machining spacers
Accomplished this week:
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Started detail design of the motor mount assembly
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Started fabrication of spacers
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Battery frame fit check
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The edges of the battery ID pockets needed to be​ deburred/chamfered. The diameter size 18.5mm was a perfect fit
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The sides of each frame needed to be sanded flat, dove tails could use one more small adjustment for an easier fit.
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Battery spot welding test
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Sunkko 788H spot welder
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Settings used: ​Current 80, Pulse 2, Power 6
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The foot pedal made using the spot welder easier and also added more current to the weld. Two pumps on the pedal made for a secure spot weld.
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I would recommend wearing safety glasses, if both prongs are not touching the nickel strip with sufficient pressure there will be a spark.
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I cut the nickel strip with sheet metal cutters and it left a serrated edge. For future cutting I will use some industrial scissors
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Ebay battery pack disassembly
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This was a mountain bike headlamp that I purchased three years ago. I got two good seasons out of it and this year it only stays charged for 10 minutes.​
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During the disassembly of the battery pack I found that there were only two batteries connected in the system. The other two batteries, tubes filled with sand, were hot glued to the side to give the appearance of a 2S2P battery pack.
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Wiring Schematic
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Completed some circuitry
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Completed some motor driver code
Goals for next week:
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Waterjet rear sprocket
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Work on code for throttle pot
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Finish motor driver circuit
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Order PCB
References:
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ebike school https://www.youtube.com/watch?v=u-4mKh1WaLo&t=463s