So what do we have here?
The Ryobi 40V cordless chain saw is:
- A 300 rpm/V, 14 pole, 63xx class, 29 milliohm brushless motor with a 12mm flatted shaft and beefy aluminum mount
- A controller with Hall sensors, a free plunger throttle (add your own lever/knob), and maybe an irritating speed-dependent cutout that will cause loads slower than 500 rpm to not work.
- A battery and charger with internal battery management circuit that can dump at least 60+ amps for some time.
Gee, that sounds like a go-kart or scooter to me. Thanks, Ryobi!
I invite anyone else who is curious to pick one of these up and maybe try running it in something. I’d say you would be hard pressed to find matched components of this power level for less than $200, battery included. The downside is that a spare battery is $100+ by itself, but as can be seen, the controller will happily use any ol’ battery. I’m curious to see how the speed-dependent cutout affects real world operation, since I couldn’t get a good handle on how much available torque it has between 0 and 3000 RPM, the controller’s “minimum speed”.
As technology marches on, so the spoils of yesterday’s cutt
As 2022 starts, let’s take some time to share our goals for CircuitPython in 2022. Just like past years (full summary 2019, 2020, and 2021), we’d like everyone in the CircuitPython community to contribute by posting their thoughts to some public place on the Internet. Here are a few ways to post: a video on YouTub, a post on the CircuitPython forum, a blog post on your site, a series of Tweets, a Gist on GitHub. We want to hear from you. When you post, please add #CircuitPython2022 and email email@example.com to let us know about your post so we can blog it up here.
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