I am building a Jamieson hollowing system. It occured to me that I
could add a thin (1/8") thin wall plastic tube taped to the boreing
bar and also a LED. I would hook the tubeing up to my air compressor
to blow chips out of the hollow form and the LED would help me achieve
a paper thin wall on the form. That would be better than the laser.
I would need a very bright light to do this. Does anyone out there
know if there exists an LED with the light output of say a 40w bulb?

On Fri, 13 Nov 2009 22:34:39 -0600, Paul wrote
(in message
):

I am building a Jamieson hollowing system. It occured to me that I
could add a thin (1/8") thin wall plastic tube taped to the boreing
bar and also a LED. I would hook the tubeing up to my air compressor
to blow chips out of the hollow form and the LED would help me achieve
a paper thin wall on the form. That would be better than the laser.
I would need a very bright light to do this. Does anyone out there
know if there exists an LED with the light output of say a 40w bulb?

my underestanding is that you would use the LED to shine through the wall of
the vessel, and use the nature of the lighted wood to show you how thin or
uniform the wall thickness is. An LED generally has a very directional light
radiation pettern, rather than an all-around diffuse pattern like a regular
light bulb. A regular light bulb will light up the entire inside of your
vessel, like a lantern, allowing you to see which parts of the wall are
thicker than others. In contrast, a single LED will light up a single spot,
according to its radiation pattern, of say 10 or 20 degrees, or whatever. If
you want a single brightly lighted spot, a single high-intensity LED is the
ticket for you. If you want a more complete internal illumination, an LED
might not be what you seek.

LEDs are reasonably enough priced, though, that it would be a great
experiment to see what kind of results you actually get. If you have to order
just one, it is likely the cost of shipping and handling will be more than
the cost of the diode. A term that sticks in my mind, like white cat hair on
dark flannel, is "5-watt high-intensity".

respectfully,
tom koehler

--
I will find a way or make one.

On Nov 14, 12:07*pm, tom koehler
wrote:
On Fri, 13 Nov 2009 22:34:39 -0600, Paul wrote
(in message
):

I am building a Jamieson hollowing system. *It occured to me that I
could add a thin (1/8") thin wall plastic tube taped to the boreing
bar and also a LED. *I would hook the tubeing up to my air compressor
to blow chips out of the hollow form and the LED would help me achieve
a paper thin wall on the form. *That would be better than the laser.
I would need a very bright light to do this. *Does anyone out there
know if there exists an LED with the light output of say a 40w bulb?

my underestanding is that you would use the LED to shine through the wall of
the vessel, and use the nature of the lighted wood to show you how thin or
uniform the wall thickness is. An LED generally has a very directional light
radiation pettern, rather than an all-around diffuse pattern like a regular
light bulb. A regular light bulb will light up the entire inside of your
vessel, like a lantern, allowing you to see which parts of the wall are
thicker than others. In contrast, a single LED will light up a single spot,
according to its radiation pattern, of say 10 or 20 degrees, or whatever. If
you want a single brightly lighted spot, a single high-intensity LED is the
ticket for you. If you want a more complete internal illumination, an LED
might not be what you seek.

LEDs are reasonably enough priced, though, that it would be a great
experiment to see what kind of results you actually get. If you have to order
just one, it is likely the cost of shipping and handling will be more than
the cost of the diode. A term that sticks in my mind, like white cat hair on
dark flannel, is "5-watt high-intensity".

respectfully,
tom koehler

--
I will find a way or make one.

Yes, that is my idea to use the light source to see how thin and
uniform my wall was. I was not aware that LED's were directional.
Never the less, they are small and bright for their size which is
crutial in this application. I guess that I will have to do the semi-
final inspections by withdrawing the boreing bar and inserting a
conventuial high intensity bulb to look for high spots. I doubt that
I will have all the parts assembled before Xmass. I'll post a comment
on how it works when I get it up and running.

Paul Gilbert

Check http://www.marktechopto.com/Products...fm?s=angledesc
They offer Red LEDs with a 110 degree beam spread. I did not dig deep into
their product line but you may find something even better.

Russ
"Paul" wrote in message
...
On Nov 14, 12:07 pm, tom koehler
wrote:
On Fri, 13 Nov 2009 22:34:39 -0600, Paul wrote
(in message
):

I am building a Jamieson hollowing system. It occured to me that I
could add a thin (1/8") thin wall plastic tube taped to the boreing
bar and also a LED. I would hook the tubeing up to my air compressor
to blow chips out of the hollow form and the LED would help me achieve
a paper thin wall on the form. That would be better than the laser.
I would need a very bright light to do this. Does anyone out there
know if there exists an LED with the light output of say a 40w bulb?

my underestanding is that you would use the LED to shine through the wall
of
the vessel, and use the nature of the lighted wood to show you how thin or
uniform the wall thickness is. An LED generally has a very directional
light
radiation pettern, rather than an all-around diffuse pattern like a
regular
light bulb. A regular light bulb will light up the entire inside of your
vessel, like a lantern, allowing you to see which parts of the wall are
thicker than others. In contrast, a single LED will light up a single
spot,
according to its radiation pattern, of say 10 or 20 degrees, or whatever.
If
you want a single brightly lighted spot, a single high-intensity LED is
the
ticket for you. If you want a more complete internal illumination, an LED
might not be what you seek.

LEDs are reasonably enough priced, though, that it would be a great
experiment to see what kind of results you actually get. If you have to
order
just one, it is likely the cost of shipping and handling will be more than
the cost of the diode. A term that sticks in my mind, like white cat hair
on
dark flannel, is "5-watt high-intensity".

respectfully,
tom koehler

--
I will find a way or make one.

Yes, that is my idea to use the light source to see how thin and
uniform my wall was. I was not aware that LED's were directional.
Never the less, they are small and bright for their size which is
crutial in this application. I guess that I will have to do the semi-
final inspections by withdrawing the boreing bar and inserting a
conventuial high intensity bulb to look for high spots. I doubt that
I will have all the parts assembled before Xmass. I'll post a comment
on how it works when I get it up and running.

Paul Gilbert

Try http://www.marktechopto.com/Products...fm?s=angledesc
They have a red LED with a 110 degree beamwidth. They may something even
better, I did not dig into the web site.
Russ
"Paul" wrote in message
...
On Nov 14, 12:07 pm, tom koehler
wrote:
On Fri, 13 Nov 2009 22:34:39 -0600, Paul wrote
(in message
):

I am building a Jamieson hollowing system. It occured to me that I
could add a thin (1/8") thin wall plastic tube taped to the boreing
bar and also a LED. I would hook the tubeing up to my air compressor
to blow chips out of the hollow form and the LED would help me achieve
a paper thin wall on the form. That would be better than the laser.
I would need a very bright light to do this. Does anyone out there
know if there exists an LED with the light output of say a 40w bulb?

my underestanding is that you would use the LED to shine through the wall
of
the vessel, and use the nature of the lighted wood to show you how thin or
uniform the wall thickness is. An LED generally has a very directional
light
radiation pettern, rather than an all-around diffuse pattern like a
regular
light bulb. A regular light bulb will light up the entire inside of your
vessel, like a lantern, allowing you to see which parts of the wall are
thicker than others. In contrast, a single LED will light up a single
spot,
according to its radiation pattern, of say 10 or 20 degrees, or whatever.
If
you want a single brightly lighted spot, a single high-intensity LED is
the
ticket for you. If you want a more complete internal illumination, an LED
might not be what you seek.

LEDs are reasonably enough priced, though, that it would be a great
experiment to see what kind of results you actually get. If you have to
order
just one, it is likely the cost of shipping and handling will be more than
the cost of the diode. A term that sticks in my mind, like white cat hair
on
dark flannel, is "5-watt high-intensity".

respectfully,
tom koehler

--
I will find a way or make one.

Yes, that is my idea to use the light source to see how thin and
uniform my wall was. I was not aware that LED's were directional.
Never the less, they are small and bright for their size which is
crutial in this application. I guess that I will have to do the semi-
final inspections by withdrawing the boreing bar and inserting a
conventuial high intensity bulb to look for high spots. I doubt that
I will have all the parts assembled before Xmass. I'll post a comment
on how it works when I get it up and running.

Paul Gilbert