Re: [sudo-access] [omni-building] [sudo-discuss] help build a motorized front-door opener for omni commons

Oops I just saw you said there were threaded holes in the chassis. That's great. This might be easier than I thought - Best, David On Thu, Jan 19, 2017 at 9:51 PM David Keenan <dkeenan44(a)gmail.com> wrote: > Yaa. This all sounds super rad. I imagine we can build the shelf > /mounting plate without much ado as long as we get the depth right. If we > use stainless threaded rod actually we could just make an adjustable height > ceiling-suspended shelf using nuts, with perhaps adjustable l-brackets at > the transom header to provide some lateral / shear support.. We also might > want to add some sort of support or L-bracket for the 2x2 to slide along > and be supported at the non-door end. It won't be a work of art, but on > paper at least it should work. > > I'll check in with niki and see if I can come on a Tuesday. I'll go take > measurements of the motor and see about creating this. Are there any > mounting holes by any chance on the motor chassis (I imagine not?) > > Best, > David > > > On Thu, Jan 19, 2017 at 7:04 PM Jake <jake(a)spaz.org> wrote: > > On Thu, 19 Jan 2017, David Keenan wrote: > > > - door arm (2x2 stick) and mechanism cannot extend lower than 2" below > top > > > of door. That's possible right? > > > > yes my design includes not protruding more than 2" below the top of the > door. > > > > > - opening force of the motor cannot be too strong. I assume the rpm can > be > > > adjusted? > > > > RPM is the speed, what you mean is the force, and yes it can be adjusted > in > > software! we can dial it to exactly 5 pounds or whatever you want. > > Also, we can entirely remove the automatic closing device that we have > there > > now, and use the motor for that purpose as well, although we might decide > to > > just keep both there. > > > > > - per code if the door is blocked or hits someone/something, it needs to > > > yield. What happens when the motor is stopped by something else, when > the > > > motor is engaged? Would that damage the motor? > > > > the motor will not be damaged, if someone blocks the door it will just > press > > right through their soft flesh and bones without stopping. This is what > you > > want right? > > > > i guess if you prefer, we can tell it that if the force is more than the > set > > number of pounds, it just yields and waits, or perhaps times out and > gives up > > after a certain number of seconds. It's not a problem. > > > > > - Not related to the mechanics, but even if the motor is not heavy, the > > > shelf upon which the motor sits will have to look and be very sturdy, > like > > > strong enough for someone to hang off of. Given the large transom, it > will > > > probably have to be a wide shelf, or perhaps stainless rods connecting > to > > > ceiling joists or something. > > > > you're right about this, the motor is a bit heavy, maybe 25 pounds? it's > in a > > milk crate next to the robot right now, and it will be used with the black > > wheel (no tire) that is in the same milk crate. > > > > I think that vertical supports into the ceiling joists would be > appropriate, > > but that's not my department. Anyway there are a few bolts I found that > fit > > the threads cast into the motor, and they're duct-taped to its brake > handle. > > > > > Again for the mechanism, I would refer to guidelines here: > > > http://www.constructionspecifier.com/understanding-new- > accessibility-requirements-for-doors/ > > > > that's a lot of stuff to read. I think we'll be fine. I even have a > battery > > we can use for the backup power. > > > > > Perhaps we can set up a time for me/others to come look at the > equipment and > > > figure out how to safely and securely mount it. > > > > i'm busy this weekend but i'm at omni every tuesday at 7pm for Hardware > Hacking > > Tuesdays and I can come in on mondays or thursdays, hit me up. > > > > -jake > >