<div dir="ltr">I'm thinking it will be in the soccer-to- football size, and not much smarter than it takes to keep bouncing. Â Less than a pound or so.<div><br></div><div>After thinking about it, I like the idea of a rotary motion that translates into linear motion. Â I was trying to picture an actuator with the motor to one side, which would make it tough to balance. Â But your description made me realize there's no reason it couldn't be directly over the center, which would make it easier to keep in sync.</div>
<div><br></div><div>Solenoid was the word that I was thinking of, but couldn't remember. Â </div><div><br></div><div>Thanks, guys!</div><div>Joe</div></div><div class="gmail_extra"><br><br><div class="gmail_quote">On Thu, Aug 14, 2014 at 6:24 PM, Jon Wolfe <span dir="ltr"><<a href="mailto:jonjwolfe@anibit.com" target="_blank">jonjwolfe@anibit.com</a>></span> wrote:<br>
<blockquote class="gmail_quote" style="margin:0 0 0 .8ex;border-left:1px #ccc solid;padding-left:1ex"><div>You ought to be able to find generic solenoids for a decent price too. That would be phyically simpler and faster, but I believe solenoids have a lot of inductance  and high current that might require extra care in the electronic side.<div>
<br></div><div>Electronics Goldmine used to have some cheap solenoids, they might still.</div><div><div class="h5"><br><br><div>-------- Original message --------</div><div>From: Jeff Highsmith <u></u> </div><div>Date:08/14/2014 5:45 PM (GMT-05:00) </div>
<div>To: Bothari <u></u> </div><div>Cc: <a href="mailto:triembed@triembed.org" target="_blank">triembed@triembed.org</a> </div><div>Subject: Re: [TriEmbed] Need a simple actuator </div><div><br></div>Joe,<br><br>About how big will the 'bot be?<br>
<br>You might consider converting the rotary motion of a motor into a linear motion using a crankshaft or similar linkage. Like a car's engine in reverse, with the crankshaft spinning but the pistons going up and down. Depending on your desired hopping rate, it might be possible to store the energy of a single rotation in a rubber band or torsion rod, using a cam, notch or catch to release it at the end of each rotation.<br>
<br>Jeff :)<br><br><br>> On Aug 14, 2014, at 16:20, Bothari <<a href="mailto:bothari@gmail.com" target="_blank">bothari@gmail.com</a>> wrote:<br>> <br>> Group,<br>> <br>> I'm interested in learning more about hardware. We use servos to move things in a circle, but what about linearly? I'd like to make a hopper that bounces instead of rolls. Googling shows electronic door locks are about what I'm thinking of, at 10 times the price.<br>
> <br>> Is there something else that is inexpensive, but electronically activated for a hopping motion?<br>> <br>> Thx,<br>> Joe<br>> -- <br>> "There are only two industries that refer to their customers as ‘users’." - Edward Tufte<br>
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</div></div></div></blockquote></div><br><br clear="all"><div><br></div>-- <br>"There are only two industries that refer to their customers as ‘users’." - Edward Tufte<br><br>
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