Problem- Laser cutting machines

[blue^ray]

Just been thinking wouldnt it be great to have a laser.

Ive been hearing good things about hklasers and ive been chatting to the staff on msn, and I am being told their larger lasers dont even cut perspex greater than 7mm.

Now where are the lasers that cut aluminium ect?

Was looking to build some roller pinions and gears, for linear motion but require 100% accuracy with which I thought the lasers would be able to do.

What lasers actually cut stuff? the lasers at hklasers seem to be just engravers for what I want to cut.

What do you guys normally use them for?

[Samax]

Hi, if you wanna have a laser, why not take us into consideraion? I think there must be one model suitable for you.

[Will_Laser]

what sort of thickness are we talking here? And also, what about avilable space and budget?

[MacGyver]

If you want to cut metal (not just etch), you need to be looking at YAG lasers, not CO2.

[MonoNeuron]

Aluminium and copper are probably the hardest stuff to cut with a laser in the CO2 class as they just reflect most of the beam back. A laser machine in about the 3K-4K Watt range will cut 1 1/2" to 2" steel (correct me on this) but only cut about 5/8" aluminium plate if that.
The mirrors on my 35 watt laser to bend the beam around to where I want it are Aliminium so as you can see you probably won't be able to afford one in the class you want.
Unless you are rich and REALLY want one.
Rich.

[GAWnCA]

How would it work if you were to blacken the aluminum before cutting with the laser? Or, scuff the surface with sand paper? I'm not really rich but would like to be able to laser cut aluminum.

Originally Posted by MonoNeuron Aluminium and copper are probably the hardest stuff to cut with a laser in the CO2 class as they just reflect most of the beam back. A laser machine in about the 3K-4K Watt range will cut 1 1/2" to 2" steel (correct me on this) but only cut about 5/8" aluminium plate if that. The mirrors on my 35 watt laser to bend the beam around to where I want it are Aliminium so as you can see you probably won't be able to afford one in the class you want. Unless you are rich and REALLY want one. Rich.

[MacGyver]

Google Cermark (there are others)... it's a paint-on material that will allow etching of aluminum (but not cutting). If you must cut, you need YAG.

[SimonArthur]

You should consider buying a waterjet cutter if you want to cut metal.

Or you could just make use of ours: http://www.bigbluesaw.com

[GAWnCA]

Originally Posted by SimonArthur You should consider buying a waterjet cutter if you want to cut metal. Or you could just make use of ours: http://www.bigbluesaw.com

How about building a water jet?

[SimonArthur]

This comes up every now and then here and on other forums.

Building a waterjet could be quite tricky. You need very high pressure pumps, hoses and fittings, 30,000 psi and up. Plus a big catch tank, a system to mix the water and the abrasive, a nozzle, and specialized control software.

It's certainly possible to do, but I'm not aware of anyone who has made a DIY waterjet. You might be the first.

[GAWnCA]

Originally Posted by SimonArthur This comes up every now and then here and on other forums. Building a waterjet could be quite tricky. You need very high pressure pumps, hoses and fittings, 30,000 psi and up. Plus a big catch tank, a system to mix the water and the abrasive, a nozzle, and specialized control software. It's certainly possible to do, but I'm not aware of anyone who has made a DIY waterjet. You might be the first.

Well, what I would like to cut is aluminum but I've read where the laser doesn't like the reflective surface. How would I overcome this problem with a laser? I only want to cut plat up to maybe 3/8" or so.

[SimonArthur]

You'll need a powerful laser.