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Messages - wild.bill

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What Can Be Cut? / Re: Materials that I can cut
« on: May 28, 2018, 02:43:10 PM »
As I said in the other thread its for the CNC and that machine is nice enough to share its air supply.

What Can Be Cut? / Re: Materials that I can cut
« on: May 28, 2018, 01:20:21 PM »
I  still like mine, I get the tank up to 150lbs and then turn the power off. It can run for a very long time without needing a refill. On the output is a pressure regulator, water trap and a flow regulator. I actually have a pile of compressors and this is the only one that I can say I like.,3223.msg36301.html#msg36301

General Discussion / Re: Laser firing up at startup
« on: May 24, 2018, 06:02:19 AM »
Some of us like troll's

General Discussion / Re: Testing Printer
« on: May 20, 2018, 07:23:29 AM »
To find anything about how they work you need to look at the marlin firmware.

If you are good with software you can change the marlin firmware and customize the interface.

General Discussion / Re: Testing Printer
« on: May 19, 2018, 07:45:56 AM »
99% of the time its not the LCD board that is the problem, its the cabling. That controller and the LCD are used on many different printers and the forums for the printers are full of people having problems with the LCD.

Make sure its 1 to 1 and 2 to 2 and try adjusting the brightness control. If that still doesn't work there are many that have connectors with the key's wrong so try reversing the connectors - which may require cutting the key's off.

Also if it is a bad LCD its very common and you can get them from lots of places and they are cheap. I know that I have at least one spare if not more. Last the printer works just fine only using the USB port - so the LCD is not really required. My i3 didn't have one and I added it as an option.

Projects / Re: Thermal measurement fixture
« on: May 18, 2018, 12:42:34 PM »
I had some time to play today looking to see what idea's might work. I was using my big machine because that was setup. Using the dohicky and slate I hooked the thermocoupe to a digital thermometer that I have, but I also have a DVM what will give temperature using a K type thermocouple.

* I pulled the lens off so the beam would not be in focus.

* Then I used my Mahoney meter to see what the power was coming outof the head, and measured 42W at 35% power.

* Next up was to use the dohicky device that I got from Russ. Using his 1/1 scale I got a 42deg temp rise which equates to 42W. This is 35% power for 41 Seconds of laser on. It's nice that the two devices agree.

* Then last I took the slate that I glued the K type thermocouple to and ran the same 41 seconds at 35% power and got a 50.8 degree temp rise. So the slate had a bigger temp rise than the aluminum disk - so I think this has potential.

* next I will try this with the diode laser. From what I am seeing I think I will need to increase the time for 41 seconds to 164 to get better resolution with a 2W laser.

Well that's it for today

General Discussion / Re: air assist
« on: May 16, 2018, 07:25:34 AM »
turn it 90 deg. does it cut better following the grain than across?

General Discussion / Re: air assist
« on: May 16, 2018, 05:53:41 AM »
At least in this thread I have not see what material you are trying to cut.

General Discussion / Re: air assist
« on: May 14, 2018, 04:50:24 PM »
The reality is the CNC machine with air assist and mist cooling/lub is by far the biggest user of air. The 80W laser uses just a small fraction of what the CNC wants, and it hardly notices the draw from the diode lasers, which is why I keep the small pumps around for when I feel lazy.

General Discussion / Re: air assist
« on: May 14, 2018, 11:18:48 AM »
<old man's rant>
I know that I have been accused of over kill but I hate buying something and then having to replace it because it was no enough for the job I wanted. I will admit I use it with 2 Co2 lasers, CNC, and all my power tools for working on my car. But I do have a couple of the smaller fish tank compressors for when I don't feel like hooking op the bigger air hoses.
</old man's rant>

Projects / Re: Thermal measurement fixture
« on: May 14, 2018, 10:55:52 AM »
I won't be that quick. I had hand surgery 10 days ago and have not been able to do much. I just go back from a Dr. visit and for the first time in more than a week I can actually use my right hand to use a mouse and type.

I always use a defocused beam while measuring power. With the Co2 at its lowest power and defocused is where I was getting steam off the cup of water.

I like the slate idea, black will help absorb the power without reflecting. My first thought was its way better than water or aluminum. I have a few unused K type thermocouples sitting around and can epoxy one to some slate and do some tests.

We back to doing my once an hour PT.

Projects / Re: Thermal measurement fixture
« on: May 14, 2018, 05:47:08 AM »
Following with interest:
First thoughts - with water there is always a chance that the laser could make steam and that would allow energy to escape and not be measured. I sometimes put a cup of water under the end of the Co2 laser while measuring something  and have seen steam coming off and felt the water temp didn't rise.

With aluminum you need to be careful because it's an excellent reflector and would reflect energy away, that is why the commercial meters use anodized aluminum because it is not as reflective. I do have some bar like you showed that is anodized I can play with.

Projects / Re: Mother's Day Gifts
« on: May 13, 2018, 08:48:25 AM »
You can find the laser power my measuring the temp rise of a mass with the laser running for a known amount of time. The problem is the initial calibration.

I have Russ's dohicky as well as the Mahoney meter. I am working on making sure they are linear using 2X & 4X times. If so I should be able to do a power profile of my 2W diode lasers with at least 10% accuracy. If the results look real I will post them. Time to go give my Mother the clock.

By way even though the title of Russ's video's say learning RD works there is great knowledge on how Co2 Lasers work.

Projects / Re: Mother's Day Gifts
« on: May 12, 2018, 03:21:20 PM »
Yes - that was cut on the big CO2 machine. It is about 14" high and will not fit on the K40.

Projects / Re: Mother's Day Gifts
« on: May 12, 2018, 12:07:52 PM »
So  here is what I made for my mother today. Its two layers of laser cut MDF and a clear acrylic top layer laser cut to help with the impression that it's a fish bowl.

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