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Date: 21 Sep 2007 10:26:59
From: Sheldon Brown
Subject: LightSPIN generator-changing sides possible?
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I have a couple of LightSPIN generators, ("dynamos" for our British
friends) but now that I can't ride bikes any more, I would like to be
able to put one of them on my Greenspeed trike.
Unfortunately, the "handedness" of my LightSPINs is the opposite of
what the Greenspeed's braze on requires. Needs to mount on the back
side of the left "seat stay."
Does anybody know if it's possible to switch the spring around in
these?
Sheldon "In The Dark" Brown
+---------------------------------------+
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Date: 21 Sep 2007 20:09:51
From: Hank Wirtz
Subject: Re: LightSPIN generator-changing sides possible?
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On Sep 21, 7:50 pm, frkry...@gmail.com wrote:
> On Sep 21, 4:38 pm, Sheldon Brown <CaptB...@sheldonbrown.com> wrote:
>
> > Andy Muzi wrote:
> > > The springs wind with different chirality so you'd need a new spring.
>
> > I was afraid of that.
>
> > However, it was worth the effort to learn a cool new word:
> > "chirality" ;-)
>
> > > I suppose you've ruled out the other side of the bike for some reason=
or
> > > another (left front facing =3D right rear facing)?
>
> > The Greenspeed has a very nice braze-on for this purpose, and it would
> > seem excessively mono-buttocked to ignore it. Maybe I'll have to
> > spring for Busch & M=FCller...
>
> Have you disassembled the generator mount and looked at the mechanical
> details? Before I gave up on the Lightspin, I'd at least try that.
>
> IME, generator mounts are simple devices. Winding a spring from hobby
> shop music wire isn't very difficult. There's a chance that you could
> turn things around - re-chiralitize it?
I did that with a Slinky once. Probably harder with a heavier spring.
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Date: 21 Sep 2007 21:19:28
From: Bill Sornson
Subject: Re: LightSPIN generator-changing sides possible?
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Hank Wirtz wrote:
> I did that with a Slinky once.
Family newsgroup, buddy.
(I still got it.)
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Date: 21 Sep 2007 19:50:27
From:
Subject: Re: LightSPIN generator-changing sides possible?
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On Sep 21, 4:38 pm, Sheldon Brown <CaptB...@sheldonbrown.com > wrote:
> Andy Muzi wrote:
> > The springs wind with different chirality so you'd need a new spring.
>
> I was afraid of that.
>
> However, it was worth the effort to learn a cool new word:
> "chirality" ;-)
>
> > I suppose you've ruled out the other side of the bike for some reason or
> > another (left front facing =3D right rear facing)?
>
> The Greenspeed has a very nice braze-on for this purpose, and it would
> seem excessively mono-buttocked to ignore it. Maybe I'll have to
> spring for Busch & M=FCller...
Have you disassembled the generator mount and looked at the mechanical
details? Before I gave up on the Lightspin, I'd at least try that.
IME, generator mounts are simple devices. Winding a spring from hobby
shop music wire isn't very difficult. There's a chance that you could
turn things around - re-chiralitize it? ;-) - by inverting or by
fabricating mirror-image versions of other components for the mount.
If you do take it apart, it would be interesting to see a photo.
- Frank Krygowski
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Date: 22 Sep 2007 12:36:36
From: A Muzi
Subject: Re: LightSPIN generator-changing sides possible?
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>> Andy Muzi wrote:
>>> The springs wind with different chirality so you'd need a new spring.
> Sheldon Brown <CaptB...@sheldonbrown.com> wrote:
>> I was afraid of that.
>> However, it was worth the effort to learn a cool new word:
>> "chirality" ;-)
>>> I suppose you've ruled out the other side of the bike for some reason or
>>> another (left front facing = right rear facing)?
>> The Greenspeed has a very nice braze-on for this purpose, and it would
>> seem excessively mono-buttocked to ignore it. Maybe I'll have to
>> spring for Busch & Müller...
frkrygow@gmail.com wrote:
> Have you disassembled the generator mount and looked at the mechanical
> details? Before I gave up on the Lightspin, I'd at least try that.
> IME, generator mounts are simple devices. Winding a spring from hobby
> shop music wire isn't very difficult. There's a chance that you could
> turn things around - re-chiralitize it? ;-) - by inverting or by
> fabricating mirror-image versions of other components for the mount.
> If you do take it apart, it would be interesting to see a photo.
I thought more about this. Since LightSpin offered both sides perhaps a
trade could be arranged with some LightSpin owner?
--
Andrew Muzi
www.yellowjersey.org
Open every day since 1 April, 1971
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Date: 21 Sep 2007 14:27:55
From: Hank Wirtz
Subject: Re: LightSPIN generator-changing sides possible?
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On Sep 21, 1:38 pm, Sheldon Brown <CaptB...@sheldonbrown.com > wrote:
> Andy Muzi wrote:
> > The springs wind with different chirality so you'd need a new spring.
>
> I was afraid of that.
>
> However, it was worth the effort to learn a cool new word:
> "chirality" ;-)
I first saw that word a few months ago when Andy used it in a
discussion of swapping a rim while reusing spokes. I'm pretty sure he
made it up. :)
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Date: 22 Sep 2007 00:28:37
From: Clive George
Subject: Re: LightSPIN generator-changing sides possible?
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"Hank Wirtz" <hank@wirtznet.net > wrote in message
news:1190410075.168195.311420@w3g2000hsg.googlegroups.com...
> On Sep 21, 1:38 pm, Sheldon Brown <CaptB...@sheldonbrown.com> wrote:
>> Andy Muzi wrote:
>> > The springs wind with different chirality so you'd need a new spring.
>>
>> I was afraid of that.
>>
>> However, it was worth the effort to learn a cool new word:
>> "chirality" ;-)
>
> I first saw that word a few months ago when Andy used it in a
> discussion of swapping a rim while reusing spokes. I'm pretty sure he
> made it up. :)
Try doing organic chemistry without coming across the term. See Thalidomide
for a particularly spectacular example.
More mundanely, it's what explains some things about sugar names. A chiral
compound will rotate the plane of polarised light (see eg minerals between
crossed polarising filters under a microscope - very pretty). So Dextrose
(glucose) rotates the plane of polarised light to the right. Laevolose
(fructose) rotates it to the left. Hence the original names for these (or
rather the particular stereoisomers found in nature).
Sugar/sucrose rotates the plane of polarised light to the right. Sucrose is
a dimer of glucose and fructose, so if you hydrolyse it (split it), it'll
give those two monomers. The fructose a strong rotator of polarised light,
so the net result is that a partially hydrolysed solution of sucrose, ie a
mix of sucrose, glucose and fructose, will rotate the plane of polarised
light to the left. And this is where the "Invert" bit of "Invert sugar
syrup" (eg Golden Syrup) comes from.
cheers,
clive
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Date: 21 Sep 2007 17:55:24
From: A Muzi
Subject: Re: LightSPIN generator-changing sides possible?
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>> Andy Muzi wrote:
>>> The springs wind with different chirality so you'd need a new spring.
> Sheldon Brown <CaptB...@sheldonbrown.com> wrote:
>> I was afraid of that.
>> However, it was worth the effort to learn a cool new word:
>> "chirality" ;-)
Hank Wirtz wrote:
> I first saw that word a few months ago when Andy used it in a
> discussion of swapping a rim while reusing spokes. I'm pretty sure he
> made it up. :)
One of my ex-employees is a hot researcher in organic chemistry.
http://www.yellowjersey.org/JRJACK07.JPG
Controlling chirality is a sticky problem for scaling up organic
synthesis as you otherwise get reversed and upside down versions besides
what you want.
--
Andrew Muzi
www.yellowjersey.org
Open every day since 1 April, 1971
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Date: 21 Sep 2007 17:13:02
From: Bill Sornson
Subject: Re: LightSPIN generator-changing sides possible?
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A Muzi wrote:
> One of my ex-employees is a hot researcher in organic chemistry.
Pot smoker?
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Date: 21 Sep 2007 19:47:41
From: A Muzi
Subject: Re: LightSPIN generator-changing sides possible?
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> A Muzi wrote:
>> One of my ex-employees is a hot researcher in organic chemistry.
Bill Sornson wrote:
> Pot smoker?
Probably, give the general run of bike mechanics.
--
Andrew Muzi
www.yellowjersey.org
Open every day since 1 April, 1971
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Date: 21 Sep 2007 23:03:06
From: c
Subject: Re: LightSPIN generator-changing sides possible?
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Maybe the aluminium bracket no. 406ALU from Busch & Müller could
be useful
Best Regards
Carlos
Sheldon Brown wrote:
> I have a couple of LightSPIN generators, ("dynamos" for our British
> friends) but now that I can't ride bikes any more, I would like to be
> able to put one of them on my Greenspeed trike.
>
> Unfortunately, the "handedness" of my LightSPINs is the opposite of
> what the Greenspeed's braze on requires. Needs to mount on the back
> side of the left "seat stay."
>
> Does anybody know if it's possible to switch the spring around in
> these?
>
> Sheldon "In The Dark" Brown
> +---------------------------------------+
>
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Date: 21 Sep 2007 13:38:27
From: Sheldon Brown
Subject: Re: LightSPIN generator-changing sides possible?
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Andy Muzi wrote:
> The springs wind with different chirality so you'd need a new spring.
I was afraid of that.
However, it was worth the effort to learn a cool new word:
"chirality" ;-)
> I suppose you've ruled out the other side of the bike for some reason or
> another (left front facing =3D right rear facing)?
The Greenspeed has a very nice braze-on for this purpose, and it would
seem excessively mono-buttocked to ignore it. Maybe I'll have to
spring for Busch & M=FCller...
Sheldon "Ambichiaral" Brown
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Date: 21 Sep 2007 13:47:16
From: SMS
Subject: Re: LightSPIN generator-changing sides possible?
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Sheldon Brown wrote:
> The Greenspeed has a very nice braze-on for this purpose, and it would
> seem excessively mono-buttocked to ignore it. Maybe I'll have to
> spring for Busch & Müller...
Good idea..., uh how much do you want for the Lightspin? I'm no purist,
I'll use a bracket, home made if necessary.
Did anyone ever find out what caused Lightspin to cease production? Was
it slow sales, undercaptilization, or was there some other reason?
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Date: 21 Sep 2007 13:27:38
From: A Muzi
Subject: Re: LightSPIN generator-changing sides possible?
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Sheldon Brown wrote:
> I have a couple of LightSPIN generators, ("dynamos" for our British
> friends) but now that I can't ride bikes any more, I would like to be
> able to put one of them on my Greenspeed trike.
> Unfortunately, the "handedness" of my LightSPINs is the opposite of
> what the Greenspeed's braze on requires. Needs to mount on the back
> side of the left "seat stay."
> Does anybody know if it's possible to switch the spring around in
> these?
> Sheldon "In The Dark" Brown
The springs wind with different chirality so you'd need a new spring.
(unlikely, if Harris doesn't have one...)
I suppose you've ruled out the other side of the bike for some reason or
another (left front facing = right rear facing)?
--
Andrew Muzi
www.yellowjersey.org
Open every day since 1 April, 1971
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