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Homebrew_PCBs@yahoogr...
May 1, 2005 7:55 pm
8650
High everyone, I've just joined your group even though I've been cruising this site for a while. I'm a member over at cnczone (great site) and I started a...
Anyone knows where to order an UV Collimator? I'm working to replace the mill on a CNC Milling Machine with a .0254mm UV beam, on presensitivized PCB. Cristian...
G'day I haven't tried it myself but I one saw reference to using the eggcrate
diffuser for flourescent lights and painting it matt black to eliminate...
A high resolution projector is 1024x768. At 6x4, that is about 180ppi, give or take. As a comparison, most find that for toner transfer a 600dpi laser printer...
I gather that you're using the CNC table to move a board under a UV source, much like a Gerber plotter. Years ago this was called 'direct imaging.' The...
laser beams are almost perfectly columinated. You just have to control dot size. The simplest technique would be to use a pinhole just a bit smaller than the...
Hi, I'm fabricating my own vacuum chamber right now. I'm using a pressure cooker and 2 venturi pumps (PneuAire) connected to a ordinary shop air compressor....
I didn't get the start of this thread so I'm getting in late. I take it that the object is to make some custom connectors. I do this routinely to make...
Grant. Light bulbs contain inert gas at atmospheric pressure. Vacuum tubes (thermionic valves) contain? a vacuum. This is why the glass is so much thicker than...
In a message dated 5/5/2005 4:32:33 P.M. Eastern Daylight Time, stefan_trethan@... writes: And most importantly: remember vacuum chanber failures are...
Are there other dangers besides sound waves? I can easily protect against that, I have high-quality ear protectors used at the firing range. If a chamber...
Ok, so an exterior testing session is warranted and no dangerous operations must be done while the contraption is on. I can find a sand pit and put the ...
... I did not know one could pull a vacuum of more than one athmosphere ;-) On which planet (or under how much water) do you need to be to do this? Implosions...
The 30 Hg is the height in inches of a column of mercury supported by the vacuum (980 millimeters, for you metric buffs, , IIRC) - NOT the weight in pounds....
I want to collimate a 30 degree UV Led Array made by Nichia. Steve <alienrelics@...> wrote:I think he means he wants to collimate a UV laser beam. Steve...
... I was of the impression that it was at somewhat lower than atmospheric pressure, otherwise you wouldn't get that "pop" when they break. ... As close as...
On Fri, 6 May 2005 14:57:54 -0400, Roy J. Tellason ... It is lower than athm., put a propane torch against it and the softening glass will be pulled in. (yes i...
... It takes a certain technique to work with glass and have it not shatter. I found that out the hard way back when I was into messing around with chemistry...
Hi Group, I am wondering if there is a such a device already out there that can print directly onto a circuit board. I see essentially two uses for such a...
... B/W tv's used 15Kv or so accelerating voltage - created soft x-rays. Color sets needed more energetic electrons for the color phosphors, so used ~23Kv,...
... Even that's a little high, 12KV was more common. ... 25KV was more common, and in the earlier tube stuff the shunt-type regulator tube would age, and...
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