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Laser Pointer Holder for 40W CO2 Laser

by kai, published

Laser Pointer Holder for 40W CO2 Laser by kai Feb 23, 2013

Description

I recently acquire a cheap chinese 40W CO2 laser engraver/cutter. It's great value for its price but not user friendly. The machine do come with red dot laser side mount next to laser head. It's simple but never line up correctly to the actual CO2 laser light path.
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 [39188] 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.

Recent Comments

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It looks like you posted the solidworks part file for the hinge twice and didn't upload the arm file. Can you please add? Need to modify to fit my laser module, and the assembly file is useless without that file.
Thanks
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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Instructions

It's pretty simple and intuitive. Follow the [39188] for more detail
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)
It looks like you posted the solidworks part file for the hinge twice and didn't upload the arm file. Can you please add? Need to modify to fit my laser module, and the assembly file is useless without that file.
Thanks
Do you even need the spring? If you balance this well the laser should just drop to the correct spot due to gravity.
kai - in reply to gannon
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.
Clever. Question- non item related. What is your experience with the chinese laser cutter?
very clever idea
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