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

wrote: Robb - you mean 1/4" thick? Just to support the 2x2 pushing stick, or the whole motor somehow? That's pretty thick Or perhaps he meant 1-1/4" angle iron, instead of a 2x2" wooden push stick? If so, I think square tubing would be even better: compact, affordable, and more resistant to buckling or twisting than an angle iron. Patrik On Thu, Jan 19, 2017 at 10:17 PM, robb <sf99er(a)gmail.com> wrote: we're gonna need something like 1'4" thick angle iron about 12" long On Thu, Jan 19, 2017 at 9:58 PM, David Keenan <dkeenan44(a)gmail.com wrote: 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: sibility-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 _______________________________________________ building mailing list building(a)lists.omnicommons.org https://omnicommons.org/lists/listinfo/building