The Nylon snap lock fittings were machined to allow the 1 inch, Outer Glass tube to fit easly to a depth of 1 inch.
The same edge of the snap lock fitting was bevelled to accept the Rubber O ring.
Next the Compession Nut was shortened by .25 of an inch and machined to fit over the 1 inchGlass tube.
The one iinch glass tube was cut to length 36 " using a diamond cutter on a Dremil rotary cutter. This part is very critical. Slow and steady.
Water will be pumped through this chamber, cooling the laser tube. The O ring is all that seals the liguid because I did not want to use any permanent sealant. This will allow easy replacement of damaged components.
This is a 24Volt 7.8 watt fluid pump that I will be using for the cooling stage. It is fairly quiet and is rated as continuious duty.
The cooling system is a closed loop. This unit is a salvaged heater core from an automobile. I shortened the hose connections and added some fittings. I will be using this 24v dc computer fan.
I will add an aluminium plate between the fan and core to duct the air through the heater core.
A small expansion chamber and filler cap will also be added to the loop.
It is important to keep the laser tube cool.
Construction of the laser tube:
- The laser tube was a used and salvaged from a water purifier. The ends were cut off with a diamond blade. A neon sign tube would also work.
WARNING: These tubes contain small amounts of mercury.
The Next series of pictures show the construction of the first stage of the end units.
The fitting untouched.
The fitting machined and two O Rings have been fitted.
I modified one of the compression parts to clamp the first stage to the water jacket fitting..
Fitting ready to be connected. I used a small amount of petroleum jelly to assemble the two parts.
The middle nut clamps the first stage to the water jacket. The alignment is now perfect and sealed from the cooling fluid
Two silicone Orings are placed on the 1/2 laser tube and 1/4 inch mylar tape is wrapped around to stop the Orings from moving.
The fitting is machined with a tappered ream
Here is the laser tube is inserted into the holder, sealed from the Liquid Coolent chamber.
Construction of the Anode and Cathode:
This material is Copper 85% and Silver 15%. SILFOS.
Here I have formed the Silfos around a pex barb fitting to achive this profile.
I clamped the end of the Silfos to the pex fitting with needle nose vice grips and then rotated it around the fitting. I then moved the grips and continued the rest of the curve. I cut the end to where the curve started. Last I formed the exit angle.
Here you can see the finished electrode with a 14 guage copper pin installed. I has also been cut to length. the shaft fits down into the 1/4" barb fitting,
This is the Cathode and Anode holder;
I changed the Nylon fitting to Brass. This allows better heat conduction and better electrical connection. Next I drilled and tapped a 1/4" threaded hole in the center of the brass plug fitting and installed a barbed brass fitting,
The assembeled spring loaded Cathode .
This end view shows the ring cathodes location. A Teflon washer is placed next to the cathode and the glass laser tube will rest up to the teflon ring. The Pumped Gas mixture will flow through the barb fitting into the laser tube.