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 ):
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".
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.
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.
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.
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