Big green laser?

[mixedgas]

Hmm...the Coherent I90 and Spectra Physics 168 look quite nice. How much current do the
power supplies draw at 5W?

You still have this thing with power, don't you.

7-10 kilowatts. A typical "5w" non medical tube has 235-245 volts of drop @ 35 amps DC tube current, at Imax. Its a nonlinear load with some quirks, so don't assume you can just linearly derate. The cathode and control circuits add another 150-250 watts depending on model. If your lucky the PSU is 85% efficient, if its a linear assume 75%.

We don't choose the power line based on current alone, we prefer to have enough voltage reserve to make sure the cathode stays hot and at its design temperature.

SP 164/165 run off 208/3 +/- very little. Other manufacturers let you have a wider input voltage range, Lexels will cover about 195 to 245. Coherents are similar on the high end but need a bit more voltage on the low end. You want 4 or 5 wire WYE service, not DELTA. Certainly NOT DELTA WITH A STING, which is common, but obsolete, in older industrial buildings in the East. DWS = instant blown laser. You don't need a neutral leg, the laser does not use it. You do need a good, solid safety ground that can take a full phase leg to ground.

If you have Delta and need WYE, that is a transformer between the laser and the power line. Lucky for you, delta is rare except in places that need a lot of lighting, heating, and much bigger then average motors.

There are some medical systems out there that are deliberately underfilled with gas, or run for a limited duration. It is best that you ask before picking up a medical ion laser. Especially any power on demand systems. I know about most of them, and have a friend that services them, and we have seen people get burnt, because of high impulse readings on the power meter, only to find they have 5-30 seconds of run. In some cases they use ordinary CW tubes, and just the PSU is derated. So you should really ask here before you buy.

Don't forget the cooling water, you need a steady, robust, flow at 2-3 gallons a minute, and at a moderate pressure. Too low is bad. Too high is manageable with care and planning. Large amounts of air in the line or water without steady pressure is just plain evil when dealing with ion lasers. If your water is not good, you install a accumulator and possibly a boost pump.

Steve

[QUAZAR]

If you only have single phase electricity, then something like a Lexel 88 would be an ideal laser. Enough power to be "usefull" but easily managed in a domestic environment.

I believe Steve can help you getting one of these for a good price.

[bwang]

Does the HGM K7 have a normal tube + derated PSU and cooling or one of those "long pulse" tubes incapable of CW?

[mixedgas]

Does the HGM K7 have a normal tube + derated PSU and cooling or one of those "long pulse" tubes incapable of CW?

K7 is long pulse, low pressure tube. They do screaming power, 6-7 watts is not uncommon in argon, but they do not do it for very long as the tube pressure shoots up and the output falls off. A K7 with dual tubes or a yellow green KR tube is worth more then a plain K7. The K7 psu is a one foot cube of remarkable sophistication that is low duty cycle and air cooled. So it needs to cool down, even though the tubes have recirculating water to air heat exchangers.

If you get a K7 that meets operational spec, and can Get it or parts of it, to Akron, Ohio. I can probably get you a brand new lexel 85-SVg head in trade. a 85-SVg is a 1.5-2 watt laser, and is different from the Lexel 85 on the Lexel Web site, its more like a 88 then a 85 tube. I

I'd need pics, model and serial, and the outside case and keyboard must be immaculate for reuse. I'd need to talk to my friend to see if he has a need for the parts. This is odd sounding, but in medical parts world, a clean, case is worth more then the guts.

But I would not play the lottery with it, and its a real pain to open it up enough to get at the current sensors so you can test the tubes. You run a good chance of cracking the case panels if you do it wrong. You also need to make sure its never been frozen in a warehouse.

No, you cannot just beef up the closed loop cooling water in the 7, its been tried. The low pressure tubes have different gas return bores then the CW tubes, and it hoses the tube.

Steve

[bwang]

K7 is long pulse, low pressure tube. They do screaming power, 6-7 watts is not uncommon in argon, but they do not do it for very long as the tube pressure shoots up and the output falls off. A K7 with dual tubes or a yellow green KR tube is worth more then a plain K7. The K7 psu is a one foot cube of remarkable sophistication that is low duty cycle and air cooled. So it needs to cool down, even though the tubes have recirculating water to air heat exchangers.

If you get a K7 that meets operational spec, and can Get it or parts of it, to Akron, Ohio. I can probably get you a brand new lexel 85-SVg head in trade. a 85-SVg is a 1.5-2 watt laser, and is different from the Lexel 85 on the Lexel Web site, its more like a 88 then a 85 tube. I

I'd need pics, model and serial, and the outside case and keyboard must be immaculate for reuse. I'd need to talk to my friend to see if he has a need for the parts. This is odd sounding, but in medical parts world, a clean, case is worth more then the guts.

But I would not play the lottery with it, and its a real pain to open it up enough to get at the current sensors so you can test the tubes. You run a good chance of cracking the case panels if you do it wrong. You also need to make sure its never been frozen in a warehouse.

No, you cannot just beef up the closed loop cooling water in the 7, its been tried. The low pressure tubes have different gas return bores then the CW tubes, and it hoses the tube.

Steve

The K7 I'm possibly getting is known working, though whether the output power is still up to spec is unknown. I'm getting it in exchange for a Coherent Sapphire 488-20 and a Coherent Compass 215M-20.
I'll let you know more if/when I get it (I'm still taking offers on the two Coherents; they are nice little lasers that are really easy to ship ).

[dsli_jon]

Hi bwang....

Hmm...you've successfully convinced me that Laserscopes are not the self-contained, plug 'n play units I thought them to be, which makes me think twice about getting one

...I just *love* a happy-ending! *snif*

Believe me, my friend, LS's are *NOT* just to 'have around the ol' house to kick-up some fun'-with...

(...see pic below... moved for 'editorial comment' reasons...

...(and I hope this pic's-intent does not 'backfire' and actually 'turn you to the Green-side'.. if it does, lemme know and I'll post the close-up shot of the burns into the *block-wall* ... as you nicely pointed-out, thier whole 'purpose in life is to burn flesh'... Sooo, glad to hear you steering towards a more 'sane' solution, for now....



.. I can heartily recommend a Lexxie 88, especially if P'fessor (mixedgas) can get you hooked-up with a high-gain / efficiency tube...

Sometime, if you're ever in the Rochester, NY, area, when I am (PM-me if you're ever planning to travel thru that area) I'd be happy to demo some of the 'pulsed-laser-danger' fixtures (ie: mock eyeball, chicken-skin, etc) that I've used in the past to help 'educate' some of our KTP-sys clients... makes the, umm, *point*, very effectively... But to a Lex88...

peace...
j

[prodjallenbackup]

Sometime, if you're ever in the Rochester, NY, area, when I am (PM-me if you're ever planning to travel thru that area) I'd be happy to demo some of the 'pulsed-laser-danger' fixtures (ie: mock eyeball, chicken-skin, etc) that I've used in the past to help 'educate' some of our KTP-sys clients... makes the, umm, *point*, very effectively... But to a Lex88...

peace...
j

Can I also get a demo, I may possible need the education as well lol

[dsli_jon]

Can I also get a demo, I may possible need the education as well lol

Oi vey... Got your Variance App mailed, yet, Allen? If not... we've nothing to talk about, till-then... Once you have your *show* acc#, *then* we can talk about the 'popping eyeball-demo', dig?

cya
j

[Banthai]

Just a test post guys .... to see if my Sig is still working ....

EDIT: yep working fine .... sorry to butt in

all the best .... Karl

[Admin]

Can I also get a demo, I may possible need the education as well lol

It's not hard to fill out the variance paperwork, retard.

Here: I'll help. Get off the board, again. Don't come back. (Thanks for all the log hits by the way.)