Laser Pointer Holder for 40W CO2 Laser
by kai, published
In the high end laser machine, it use ZnSe or GaAs lens as beam combiner. However, the cost of lens just way too expensive for this low-end machine. So I found  have a great idea to make a lever to drop the red dot laser on the light path when the door is opened. And once the door is closed, the red dot laser will put aside to allow actual CO2 laser to pass through. The addition feature for this design is this also works like "Laser Beam Guard", when the lid is open, it will block the CO2 laser in case the laser misfired.
Thus, I start to design my own lever holder and pivot holder for the chinese laser machine.
I made the pivot holder be a "clip on" device so you can snap on the machine with out modify the laser machine and slide it left/right to adjust it's position.
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Yes, but it's really tricky to make the length and angle right. I spent whole night to make the dimension works. And pivot point is only hold by one M3 screw. If I make screw loose, the gravity can do it's job but the alignment will be hard to get it right because of the slack. So far it is good enough for me and repeat position seems also pretty accurate. I will be pretty happy, if someone want to derive from it to perfect it.
Do you even need the spring? If you balance this well the laser should just drop to the correct spot due to gravity.
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I drill and tap two hole to install the spring so laser will drop down once the door lid is opened. These is not in the CAD design because the spring might be vary from what you have on hand.
The extension spring I am using is from Harbor Freight
"200 Spring Assorted" (http://www.harborfreight.com/200-piece-assorted-spring-set-67562.html)
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