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

[Patrik D'haeseleer]

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-acces
>>>> 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
>>>>
>>>>
>>
>
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