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

[David Keenan]

Thanks brendan - for sure, good point.

Robb - you mean 1/4" thick? Just to support the 2x2 pushing stick, or the
whole motor somehow? That's pretty thick

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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