[chbot] Chchrobotics Digest, Vol 120, Issue 14
Chris Sharkman
chris.sharkman at gmail.com
Mon Sep 25 08:01:58 BST 2017
also depends on type of curtains gathered curtains suck on motorised tracks
where as inverted pleats or bi pleats move and close better. commercial
tracks use a belt or chain system with a motor can at one end. they also
have options on li-ion motors with solar as well.
any question just ask. install these for a job
On Mon, Sep 25, 2017 at 6:04 PM, <chchrobotics-request at lists.ourshack.com>
wrote:
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> Today's Topics:
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> 1. Re: Home Automation - Curtains (Helmut Walle)
> 2. Re: Home Automation - Curtains (Andrew Errington)
>
>
> ----------------------------------------------------------------------
>
> Message: 1
> Date: Mon, 25 Sep 2017 17:44:10 +1300
> From: Helmut Walle <helmut.walle at gmail.com>
> To: chchrobotics at lists.ourshack.com
> Subject: Re: [chbot] Home Automation - Curtains
> Message-ID: <9bc5335c-f0c0-84fa-3aa3-098582cc0b56 at gmail.com>
> Content-Type: text/plain; charset="utf-8"; Format="flowed"
>
> There are two ways to get traction: rather than just winding it around
> the drive pulley, clamp or attach it to a point on the circumference
> there, so that it must follow when the wheels are turning... Or wind it
> around the drive pulley a number of times - "rope" friction around a
> pulley is proportional to the number of turns, everything else being
> equal. Also, for keeping it taut, you can use a steel spring; this is
> quite common in string-based transmissions.
>
>
> On 25/09/17 17:38, Andrew Errington wrote:
> > There's also "fishing line I happen to have to hand", which is clearly
> > unsuitable in this case.
> >
> > I'm going to try the builder's line again. This time with a cable tie
> > that I can crank down on to get the tension.
> >
> > Thanks,
> >
> > Andrew
> >
> >
> > On Sep 25, 2017 5:01 PM, "Charles Manning" <cdhmanning at gmail.com
> > <mailto:cdhmanning at gmail.com>> wrote:
> >
> > There's fishing line... and fishing line.
> >
> > Nylon stretches like anything. Braid (eg.
> > https://www.completeangler.co.nz/line-95/braid-97/
> > <https://www.completeangler.co.nz/line-95/braid-97/>) has
> > practically no stretch and is available in many colours and
> strengths.
> >
> >
> > On Mon, Sep 25, 2017 at 3:51 PM, Andrew Errington
> > <erringtona at gmail.com <mailto:erringtona at gmail.com>> wrote:
> >
> > Hi everyone,
> >
> > I thought I'd start a new thread, as we got away from the
> > relative merits of Banggood vs DealExtreme.
> >
> > I am trying to motorise my curtains, particularly as there are
> > six windows in one room, plus home automation is cool.
> >
> > So far I have identified a suitable motor and gearbox, 12Vdc
> > supply, 60rpm output, with good torque and fairly quiet.
> >
> > At one end the motor, with a 16-tooth GT2 pulley, is attached
> > to the wall using a purlin bracket (purlin brackets are
> > cool). At the other, I am using a sewing-machine bobbin on an
> > M6 bolt as a pulley.
> >
> > It's early days, but I have tried builder's line, which
> > doesn't stretch, but does slip. I have tried fishing line,
> > which does stretch, and slips.
> >
> > I think GT2 toothed belt would work well, but I haven't tried
> > it yet.
> >
> > The motor is temporarily connected to a 12V battery for
> > testing. Later I will use an ESP8266 with microPython to
> > control the motor.
> >
> > Finally, I'll link it to home automation software and relax in
> > my chair as the sun goes down and the curtains gently and
> > quietly close.
> >
> > That's my plan, but there is plenty of room for alternatives
> > or failure.
> >
> > The attached link is for a belt clamp and tensioner made from
> > zip-ties, which I think I will adopt!
> >
> > Best wishes,
> >
> > Andrew
> >
> > http://diyprojects.eu/wp-content/uploads/2017/01/belt-
> connection-zip-ties.jpg
> > <http://diyprojects.eu/wp-content/uploads/2017/01/belt-
> connection-zip-ties.jpg>
> >
> > _______________________________________________
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> ------------------------------
>
> Message: 2
> Date: Mon, 25 Sep 2017 05:04:21 +0000
> From: Andrew Errington <erringtona at gmail.com>
> To: Christchurch Robotics <chchrobotics at lists.ourshack.com>
> Subject: Re: [chbot] Home Automation - Curtains
> Message-ID:
> <CAGZkoWRDebVSwmvpmVddmasCz4EQBc1TDO7ox3uCcW9xwnrgTw at mail.
> gmail.com>
> Content-Type: text/plain; charset="utf-8"
>
> Thanks Helmut.
>
> I can't attach the cord to the pulley as it is a continuous loop from one
> side of the window to the other. So it must be free to wind "on" on one
> side and "off" on the other.
>
> I have made several turns around the drive pulley, but sometimes the
> incoming cord winds on top of the other coils instead of next to them, so
> it snarls up. I think I need fatter cord and fewer turns to avoid this.
>
> I need grippy, stretch-free cord, and grippy pulleys with only one turn
> around them. A spring would work for tension, or a rubber band cut from a
> bicycle inner tube. I might try that too.
>
> Thanks,
>
> Andrew
>
> On Sep 25, 2017 5:44 PM, "Helmut Walle" <helmut.walle at gmail.com> wrote:
>
> There are two ways to get traction: rather than just winding it around the
> drive pulley, clamp or attach it to a point on the circumference there, so
> that it must follow when the wheels are turning... Or wind it around the
> drive pulley a number of times - "rope" friction around a pulley is
> proportional to the number of turns, everything else being equal. Also, for
> keeping it taut, you can use a steel spring; this is quite common in
> string-based transmissions.
>
> On 25/09/17 17:38, Andrew Errington wrote:
>
> There's also "fishing line I happen to have to hand", which is clearly
> unsuitable in this case.
>
> I'm going to try the builder's line again. This time with a cable tie that
> I can crank down on to get the tension.
>
> Thanks,
>
> Andrew
>
>
> On Sep 25, 2017 5:01 PM, "Charles Manning" <cdhmanning at gmail.com> wrote:
>
> There's fishing line... and fishing line.
>
> Nylon stretches like anything. Braid (eg. https://www.completeangler.co.
> nz/line-95/braid-97/) has practically no stretch and is available in many
> colours and strengths.
>
>
> On Mon, Sep 25, 2017 at 3:51 PM, Andrew Errington <erringtona at gmail.com>
> wrote:
>
> > Hi everyone,
> >
> > I thought I'd start a new thread, as we got away from the relative merits
> > of Banggood vs DealExtreme.
> >
> > I am trying to motorise my curtains, particularly as there are six
> windows
> > in one room, plus home automation is cool.
> >
> > So far I have identified a suitable motor and gearbox, 12Vdc supply,
> 60rpm
> > output, with good torque and fairly quiet.
> >
> > At one end the motor, with a 16-tooth GT2 pulley, is attached to the wall
> > using a purlin bracket (purlin brackets are cool). At the other, I am
> > using a sewing-machine bobbin on an M6 bolt as a pulley.
> >
> > It's early days, but I have tried builder's line, which doesn't stretch,
> > but does slip. I have tried fishing line, which does stretch, and slips.
> >
> > I think GT2 toothed belt would work well, but I haven't tried it yet.
> >
> > The motor is temporarily connected to a 12V battery for testing. Later I
> > will use an ESP8266 with microPython to control the motor.
> >
> > Finally, I'll link it to home automation software and relax in my chair
> as
> > the sun goes down and the curtains gently and quietly close.
> >
> > That's my plan, but there is plenty of room for alternatives or failure.
> >
> > The attached link is for a belt clamp and tensioner made from zip-ties,
> > which I think I will adopt!
> >
> > Best wishes,
> >
> > Andrew
> >
> > http://diyprojects.eu/wp-content/uploads/2017/01/belt-connec
> > tion-zip-ties.jpg
> >
> > _______________________________________________
> > Chchrobotics mailing list Chchrobotics at lists.ourshack.com
> > https://lists.ourshack.com/mailman/listinfo/chchrobotics
> > Mail Archives: http://lists.ourshack.com/pipermail/chchrobotics/
> > Meetings usually 3rd Monday each month. See http://kiwibots.org for
> > venue, directions and dates.
> > When replying, please edit your Subject line to reflect new subjects.
> >
>
>
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>
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