KH 750 60W Power issues on new laser

[mwbaker63s]

Hi

I am hoping the clever people who hang out on this forum can help me with a issue I am having with a new laser. I have taken delivery of a KH750 details
RDC6442G controller
KH Lazer Tube - 1000mm x 50mm 60w
Software - RDWorks V8

The issue I am having is that the laser power is way down. When firing the laser tube glows pink, but placing a piece of plywood in the beam on the second mirror only produces a weak burn (See pics) The depth of burn at 10 second is 1mm.

I have checked the beam path and it in in the middle of each mirror and the lens.
I have cleaned the lens

Using the software I have set the power to 90% min and 90% max at 3mm/s but all I get is a light mark on wood.

Setting the power to 90% on the panel and firing the laser via pulse makes a faint mark.

I have checked the water flow and temperature and have run the tests at 20 deg C.

I cannot see any damage on the tube, but that is always a possibility.

Before taking on the cost of a new tube I am looking for any suggestions of settings or tests I can run to prove it is the tube.

I have been looking for a replacement tube but the 60W 1000mm x 50mm seems a rare beast, so if anyone knows of a supplier or manufacutrer in the UK or China , information would be greatly received.

Thanks for any responses.

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[frank wang]

Hi ,my friend

what is the material and thickness do you want to cut ?
for a 1000mm length tube , the power can not up to 60W

The problem is the tube , the power is weak .

If you want to cut thickness material and get quick speed , you need
change your power supply and tube together .

[fixtureman1]

Have you aligned the beam. Is the beam hitting the nozzle. is the focusing lens in place and are you at the correct focal point.

[mwbaker63s]

Only 3 to 5 mm - I have a 40w laser that can do these no issue.

Is there a min power requirement for the tube to fire?

Hi ,my friend

what is the material and thickness do you want to cut ?
for a 1000mm length tube , the power can not up to 60W

The problem is the tube , the power is weak .

If you want to cut thickness material and get quick speed , you need
change your power supply and tube together .

[mwbaker63s]

Have you aligned the beam. Is the beam hitting the nozzle. is the focusing lens in place and are you at the correct focal point.

Yes. I have aligned the beam all along the path and done a sloped cut (by which I mean mark as it will not cut) and the focal length is 20 mm as per the guide supplied with machine.

I can only think that I am going to need to get someone to check the power supply.

[fixtureman1]

even if you do a slope test thebeam could be hitting the side of the nose cone I had that happen to me and it would mark but not cut

[BrendonV]

Hi mwbaker. I have a similar problem with my new 60w kh laser. It runs perfectly just not enough power to cut like it should. All my research pointed to a new tube and power supply which I have just ordered. Will let you know how it works out

[rafaelsaru]

Hi

I am hoping the clever people who hang out on this forum can help me with a issue I am having with a new laser. I have taken delivery of a KH750 details
RDC6442G controller
KH Lazer Tube - 1000mm x 50mm 60w
Software - RDWorks V8

The issue I am having is that the laser power is way down. When firing the laser tube glows pink, but placing a piece of plywood in the beam on the second mirror only produces a weak burn (See pics) The depth of burn at 10 second is 1mm.

I have checked the beam path and it in in the middle of each mirror and the lens.
I have cleaned the lens

Using the software I have set the power to 90% min and 90% max at 3mm/s but all I get is a light mark on wood.

Setting the power to 90% on the panel and firing the laser via pulse makes a faint mark.

I have checked the water flow and temperature and have run the tests at 20 deg C.

I cannot see any damage on the tube, but that is always a possibility.

Before taking on the cost of a new tube I am looking for any suggestions of settings or tests I can run to prove it is the tube.

I have been looking for a replacement tube but the 60W 1000mm x 50mm seems a rare beast, so if anyone knows of a supplier or manufacutrer in the UK or China , information would be greatly received.

Thanks for any responses.

I bought one exactly the same and I'm not getting cut anything .. already lined lenses but nothing ..
You fixed your machine ?

[fixtureman1]

I just reread your post and if you get a burn like that at the second mirror then you should get a good beam out the nose cone. You will need to align the mirror on the head to hit the center of the lens.

[Dean448]

No power out of the nozzle usually is from alignment. Or lens is backwards. You can check the ma out of the tube with a shunt and amp meter. They also sell ma meters for lasers. You should get to at least 20 for a high power cut


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[TulsaBill]

I too have the same laser. Did you ever resolve your issue?