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  1. #21
    Registered
    Join Date
    Feb 2010
    Posts
    58
    the only way I can engrave is set a lower power setting, I can't really draw because as you see, I get one power setting.

    So I have to run two passes.

    Some folks say I can do more with the controller than just use DeskNC, but until I get ahead inventory wise I really don't want to be fooling with anything inside that box

  2. #22
    Junior Member
    Join Date
    Aug 2003
    Posts
    494
    I have the laser up and running with the 100 watt tube and it is indeed VERY controllable right down to %4 of rated power.

    I can engrave on paper without cutting through at speeds of 100mm/s and then cut right through pine wood 18 mm thick in a single pass. Probably more if I had a more powerful air pump. I have set my MAX power setting to 90% in software so I don't run it too hot. I will also need a chiller as the little air radiator I have just isn't enough to keep up the cooling with cutting 600 snow flakes 8" in size. I ended up getting another bottle of distilled water and putting it in the freezer for a few hours and then alternating the bottles to keep the water temp under 24 deg. pretty hard when the ambient is 43 deg in the shed.

    The only thing I am really worried about is having it in the shed when the temp get to below freezing and the water in the tube freezes and wants to crack the glass. I hope this doesn't happen but it is something I can live without.

    Time will tell if the tube is good value for money. So far I am VERY pleased with it.

    The tube hasn't got a metal to glass seal and upon further inspection it has the ends glued on like all the rest but I don't know if there is an o-ring seal in there or not. The glue seal is very thin and hard to detect except if you look closely.

    Rich.
    I am not completely useless.......I can always serve as a BAD example.

  3. #23
    Registered
    Join Date
    Apr 2006
    Posts
    251
    What do you set the PWM frequency at? I know it can be changed in the software but I haven't found any info on what the min/max is.

  4. #24
    Registered
    Join Date
    Nov 2009
    Posts
    314

    potentiometer diagram for power setting

    Hi,I also enclosed potentiometer diagram (variable resistor)for power setting.
    hope all friends will clear this upon "tdiaz"'s photo now.
    :rainfro:
    mike@xyz-tech.com


    Quote Originally Posted by tdiaz View Post
    That looks like the RECI tube I have, and have worked out a table with voltage settings, to get me various power settings:

    The Speed of Orbit » and the next have some photos of the setup.

    This is how I have it now, with a meter inline, a large knob so I can turn it with more detail. I pick a voltage and that gives me the output level desired when triggered.


    See a larger one, here: Laser power setting selector with inline meter to set a speci... on Twitpic (click the photo header to see a larger one)

    Using this RECI tube and the "100W" power supply from Light Object, and the attached power setting table, I get the same output each time.
    Attached Thumbnails Attached Thumbnails potentioneter_digram_for_power_setting.jpg  

  5. #25
    Junior Member
    Join Date
    Aug 2003
    Posts
    494
    Quote Originally Posted by epilotdk View Post
    What do you set the PWM frequency at? I know it can be changed in the software but I haven't found any info on what the min/max is.
    I got my PWM setting info from the seller who consulted the manufacturer.

    Most of the glass tube laser seem to be set at 10 KHz to 20 KHz.

    I set mine at 20KHz and it seems to work very well.

    :-)
    I am not completely useless.......I can always serve as a BAD example.

  6. #26
    Quote Originally Posted by epilotdk View Post
    What do you set the PWM frequency at? I know it can be changed in the software but I haven't found any info on what the min/max is.
    For information only - the Synrad RF tubes are recommended to run at 5 kHz with 20 kHz as the maximum.

    Tweakie.
    CNC is only limited by our imagination.

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