My plan is to arrive at 10am tomorrow and try to get them in.




Right on Luke! Recall that our temporary cell number is (773) 306-8584 if you or anyone else needs one of us to toss an official looking maker badge over the fence to help you get through the gates, though I imagine with a bike like that no one will doubt your maker credentials.liveforphysics wrote: My plan is to arrive at 10am tomorrow and try to get them in.![]()
Green Machine wrote:Justin and Robbie were here in SF for a couple of nights staying at my place by the ocean.
Highlights...crashing and destroying 100mph castle driven car new out of box...worlds most expensive dog toy.
Jump starting broken down van with hobby king lipo.
Riding the best electric skateboard ever.
Late night bloody mary's and sushi.
Talking about ebikes until 5 in the morning.
Breakfast over the cliffs.
Getting my v3 cycle analyst dialed in by the hands of the very best.
My astro powered bike today is a tamed beast (it has a legal mode) and ready for riding safely through the crowds of makers faire.
This reminds me of the dropouts with integrated strain gauge sensor. I wish all drop outs were bolt on and universal so we could make a one fit all solution:justin_le wrote: After a few revisions on ways of sensing the torque, some of which had way too much flex for my liking, we came up with this, machined from aluminum plate stock.The lever arm of the bracket pulls downwards the metal in a way that results in a uniform shear force inside the dogbone cutout, which is then easily measured with a single shear sensing strain gauge bridge.
A few days of CAD and CAM and then finally CNC machining: It's always a happy moment when something comes off looking exactly like the 3D computer models: And here is a closeup showing what it looks like with the strain gauge sensor glued in place. Strain gauges are delicate things, but once glued to the solid aluminum substrate and covered with potting compound they're as robust and reliable as you could hope.
justin_le wrote:One of the more exciting pieces of gear being field tested is a high power modded 6-mosfet sinusoidal field oriented motor controller (FOC) that we've been developing with Accelerated Systems of Waterloo, Ontario. They have a nicely compact stock controller in production called the BAC 500 that we were looking to carry as a sophisticated higher-end ebike controller.
Any news on how your customised BAC500's are coming along? I am very keen to test one out.justin_le wrote:Hopefully not too long in fact. We're working on doing a pre-production pilot batch of 50 pieces by mid to late June and are getting the stuff in gear for that.PaulD wrote:Just found this thread. Justin, a high quality programmable FOC controller is a game-changer, when can I have one????'