60X Fan Mount
This page was contributed by Mark Schweter firstname.lastname@example.org
This project was the result of a need for a "quick-fix" fan interface for my new 60X head. Previous experimentation by Steven Roberts, and myself, had resulted in mounts with a less than "professional" appearance. The design considerations were: A clean finished appearance, L.Michael Robert's information on fan selection and Karl Rothweiler's report of an "official" fan riser he had seen.
Parts & Fabrication
Select a fan from the table [All fans are 235 CFM approx.]
The fans can can be obtained world-wide from Newark Electronics and it's affiliates. (I bought mine from a local electronics surplus store.) Also obtain a suitable grille for mounting on the fan. I also purchased a fan-to-cord connector for ease of assembly.
6" PVC sch40 pipe (sch80 will have
double the wall thickness). Sawn into a 1" [25 mm] section. File the
pipe section smooth and flat on edges so that it will mate to the lid and
Position mount on lid so
the greatest area of the blades is over the exhaust port of the laser head
as shown in the picture above.
There are 4 wires coming
out the side of the head, usually going to a 4 pin connector. Two of these
carry 110 volts (250 on European 60Xs) and two of the wires are part of the
start interlock circuit.
Continue testing until
you have identified all four wires as either power or interlock wires.
NOTE: On 60X lasers with interlock switches under the cover, the switch must be depressed (on) for you to get a reading on the meter when testing interlock wires. The thermal switch clamped to the tube must also be in proper working order (normally closed) in order to get a reading.
The factory put a 4 pin connector on the fan for a good reason. By putting a loop of wire on the fan side of the connector to close the interlock circuit, they provided a means for confirming a fan is attached. It would be prudent for the laserist to do so as well, especially if you use a detachable fan. A 60X tube will only survive without damage or change in gas pressure for about about 1 minute when operating at 10 amps without a fan.
WARNING: Incorrect wiring WILL destroy your PSU and your 60X head!!!
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