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

[David Keenan]

Oh I see.. but it'd have to be longer than 1' -

Square metal tubing does sound more robust, if more of a pain to attach the
wire & hinge too




On Thu, Jan 19, 2017 at 11:52 PM Patrik D'haeseleer <patrikd at gmail.com>
wrote:

> On Thu, Jan 19, 2017 at 10:20 PM, David Keenan <dkeenan44 at gmail.com>
> 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 at 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 at 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 at 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 at 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
>
>
>
>
>
>
>
>
>
>
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