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

Thu Feb 2 00:43:44 PST 2017

Wow! That's very nice, many thanks Alex!!

(I hope the peanuts helped a tiny bit!) :)

Daniel

On Wed, Feb 1, 2017 at 5:31 PM, Jake <jake at spaz.org> wrote:

> alex wrote a program to control the door motor and it worked.
>
> https://github.com/jerkey/doormotor/tree/alex-firmware/firmware
>
> last night we got the motor controller working to turn the motor the way we
> want to, in a very powerful and controlled manner.
>
> we are ready to use it to open the door if people step up and install the
> motor
> over the door.
>
> -jake
>
>
> On Fri, 20 Jan 2017, David Keenan wrote:
>
> 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-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
>>>
>>>
>>>
>>>
>>>
>>>
>>>
>>>
>>>
>>>
>>> _______________________________________________
>>>
>>>
>>> building mailing list
>>>
>>>
>>> building at lists.omnicommons.org
>>>
>>>
>>> https://omnicommons.org/lists/listinfo/building
>>>
>>>
>>>
>>>
>>>
>> _______________________________________________
> building mailing list
> building at lists.omnicommons.org
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>

-- 
Daniel

Signal: 415.336.9143 <https://whispersystems.org/>

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