HD4 with 7 watt laser

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HD4 with 7 watt laser

Postby CharliesWoodStuff » Sun Jul 07, 2019 4:07 pm

I’m trying to configure the “bit” for using the 7 watt laser.

What is the “width” I need to use for the laser?

Are there any videos that take me step by step in configuring and using it?
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Re: HD4 with 7 watt laser

Postby Adrian » Sun Jul 07, 2019 6:04 pm

Don't think the width matters as long as you specify the "cut" to be On the vector rather than inside/outside. The centre of the "bit" is used for the toolpath calculations.
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Re: HD4 with 7 watt laser

Postby rig gap » Sun Jul 07, 2019 8:05 pm

I specified the smallest diameter I could (1/32") just so the toolpath preview would look right...as Adrian said, just choose to cut on the line, not inside/outside.
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Re: HD4 with 7 watt laser

Postby TReischl » Sun Jul 07, 2019 8:14 pm

I use .007 on mine.

How did arrive at that value you ask. . .

By cutting cutting an inside square and an outside square in some veneer until they fit nicely. I started with a .005 diameter so it did not take long at all.

The idea of cutting on the line if you are doing marquetry type work does not produce the best fits, they are sort of ok. The reason being is that if you are cutting on the line it guarantees that there will be clearance equal to beam diameter. .007 in smaller work is just way too much.
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Re: HD4 with 7 watt laser

Postby garylmast » Mon Jul 08, 2019 1:06 pm

Although my laser is a 400 watt, I noticed the closer the nozzle is from the material it gives a narrower line. Sometimes when I'm cutting, the material is warped so I adjust the nozzle to clear the high point. I've noticed at the lower places, the cut is wider and sometimes has soot at the edges.

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Re: HD4 with 7 watt laser

Postby TReischl » Mon Jul 08, 2019 6:16 pm

garylmast wrote:Although my laser is a 400 watt, I noticed the closer the nozzle is from the material it gives a narrower line. Sometimes when I'm cutting, the material is warped so I adjust the nozzle to clear the high point. I've noticed at the lower places, the cut is wider and sometimes has soot at the edges.

Gary


Yup. You probably know all about focal length. Suffice it to say that the longer you can set the focal length the less problems you will have with varying beam diameter. On my laser the focal length is 6 inches. The thing to remember with lasers is that they are not like cutting tools, the "keep that bit as short as possible" does not apply. Of course if it gets too long you can start to experience other problems, like any little itty bitty jitter in the machine is magnified.

The focal length on mine can be adjusted by turning the lens cap, so it is obviously more than a lens cap.

IIRC the most intense spot of the beam should actually be about 1/3 the thickness of the material below the surface, not right at the surface. The reason is that there is enough heat concentration to cut but some of the beam divergence is split between upper and lower surfaces. This may have changed over the years or is only applicable to Co2 lasers.
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