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

[David Keenan]

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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