Saturday, January 31. 2009The Recchetta - my eBike project
I think I finally figured out a decent use for my blog, at least for another six-months or-so.
 Lately, I've received a steadily-increasing volume of questions regarding my "simple" electric bike setup. While the wiki details the "final" product...or, more accurately, the project's /current/ state. The design continues to evolve...and improve. There's just not much room for commentary, or quite-simply, folks to ask the questions I value so much (as they help me better-explain details, and force me to think about possible design revisions...and have great ideas themselves!). So, here it goes... The current state is simply that the setup remains fully-functional. I've had other time commitments & constraints, which pulled me off this project off-and-on over the past couple of months. As a result, since the waterproofing was not complete, I simply haven't ridden it near-enough to really give a substantial report yet.
The wheel-mounted pulley is still working great though, as are the "Ping" batteries. Though, what's currently being revised are three major parts: 1) The electronics should be waterproofed by this time next week; I've got a few evaluation boxes in the mail, and I'll report-back on what does & doesn't work (with pics of-course). 2) The throttle itself now also uses a waterproof potentiometer. Watch the wiki page for more details over the next few days. 3) The clutch-bearing & pulley setup has been completely re-engineered. It's now far-easier to mount onto a motor's shaft, and no longer requires adhesives, or a custom motor shaft. In-effect, I've done-away with the roller-bearings, and instead machined...well...I dont know what you call it...how about the Recchetta Clutch It can handle 7.5Nm of torque, and has a maximum RPM of 10,000 (with normal usage only hitting about ~8K RPM). Apparently my camera is acting up, so I'll post pictures in a few days.
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Greg,
Can you give some recent updates and details on how you built the "clutch"? Also, I am thinking of buying that Golden Eagle hoop, how much power will it take? I want to run around 2kw. Have you noticed any spoke warping? Have you tested your system with full power acceleration? Sorry for all the questions, you are the trailblazer here and I am riding blind. haha Thanks, Dave (etard)
Dave,
The Golden Eagle wheel pulley continues to work great. The utilized spokes are non-butted stainless spokes (~2.1mm thick), and they continue to hold without incident. Full power acceleration? That was never a design goal, and until I upgrade the ESC's capacitors, I'm not testing that (as I simply dont want to smoke a $200 ESC). The clutch...I completed the lathe work late Sunday, and am planning to start/complete an assembly writeup, w/ pictures, by mid-week. |
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