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Messages - ggallant571

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Trouble Shooting / Re: Image fades
« on: February 15, 2018, 10:16:05 PM »
I would suspect your speed is not accurate. A deep burn at 3000mm/min with a 2.5W laser certainty makes me jealous. Try some of the "standard" test patterns such a square and circles where you can compute the real speed.

If the distance between changes in intensity is small the motion would still be inside the acceleration ramp range and never get to the set speed. This might explain your fading problem if the area that is fading is relatively long with a constant burn intensity.

Engraving / Re: How long do you run your laser for?
« on: February 15, 2018, 04:29:29 PM »
He probably machined the rough edges to perfectly flat surfaces with a 0.5W laser. Then he posts a video showing easy it was and teasing the rest of us to try and replicate his success.

Custom Size Frames / Re: Building an eggbot type laser
« on: February 14, 2018, 07:17:42 AM »
Depends on where you put the range finder code. You could:

 1. Modify the embedded GRBL code but the the Z axis would be confused if there is nothing detected.
 2. Change the host application (if you have the source) and add a option/mode control.
 3. Add another Arduino for just the Z-Axis with its own application.

I'm open to almost anything. Especially ideas!!!!

T2 Engraving / Re: Newly dowloaded, Need a question answered
« on: February 13, 2018, 04:09:58 PM »
You know what they say with diode laser systems. If it's working, it's just teasing you.

Custom Size Frames / Re: Building an eggbot type laser
« on: February 13, 2018, 02:42:30 PM »
Range finder sounds like an excellent idea. Especially for solids. I was planning on adding profiles but that would be a lot of work.

Custom Size Frames / Re: Building an eggbot type laser
« on: February 13, 2018, 10:06:49 AM »
Thanks for posting. I have just finished building a rotary fixture for etching glass and am interested in your results. I think a third axes for keeping the laser head at a constant distance would be necessary. What power laser and lens do you have?

BenCutLaser / Re: BCL program hangs !
« on: February 13, 2018, 06:25:14 AM »
Do you have the computer enter "sleep" mode? Can you do 2 sets of 25 passes? If possible, post the source file for analysis if you expect others to verify/duplicate your problem.

General Discussion / Re: Choosing first laser engraver
« on: February 13, 2018, 06:20:37 AM »
1. Exhaust depends on what materials you cut. I like the fumes from wood
    whereas the fumes from paint and plastics are nasty. Slate must make
    some dust but I can't find it.
2. You probably will want a waste base board to protect your work table
     and help with alignment.
3. Laser beam protection is important and the extent is largely dependent on where
    and who is near the device when cutting. I make cheap enclosures out of
    foam board and duct tape. I also have a dedicates cutting area that is somewhat

Custom Size Frames / Re: Building an eggbot type laser
« on: February 13, 2018, 06:07:13 AM »
There might be a problem with your link to the video.

T2 Engraving / Re: Adjustable Z axis Module Motor
« on: February 12, 2018, 02:40:42 PM »
I don't think it is acceleration. Just the speed. Have the same problem with my glass engraver which is lead screw driven. You will get the same noise if you try to run a 80 pulse/mm system at 15000mm/min.

T2 Engraving / Re: Adjustable Z axis Module Motor
« on: February 12, 2018, 02:16:17 PM »
At 400 steps per mm any speed over approx 3000mm/min will result in stepper pulse widths/frequency that exceed the capability of the motor to respond. Result is often a rather nasty sounding grinding noise. I think you can set the max speed for each axis. You should be able to test this via a generic terminal emulator, writing a short g-code program, of in a grbl controller application.

General Questions / Re: Which Stepper controller?
« on: February 12, 2018, 06:17:16 AM »
I have ordered from 3 different vendors and noticed significant differences in the current limiting. There are 2 published sense resistors. See Luckily they are 3 different colors, red, green, blue.

General Discussion / Re: new 15w focused on ebay really cheap
« on: February 11, 2018, 01:15:43 PM »
Looks like your avatar would be a good image for etching.

Assembly Help / Re: How to Wire ManaSe with 3.5W TTL
« on: February 10, 2018, 09:57:41 PM »
Via an online calculator 3A at 12 needs 22 gauge.

T2 Engraving / Re: burn appears to move
« on: February 08, 2018, 10:46:59 AM »
While not related to your specific problem, get some cheap colored cardstock to do your test burns on. I prefer the type labeled "Neon" available at Walmart and stationary stores. Comes in a couple of sizes. Reacts to low power laser very nicely. Wood is an excellent finished product medium, horrible for problem analysis.

Second - try some known test patterns like squares, circles, and triangles to help isolate electro/mechanical problems. Scanning this site will reveal a number of possible causes including:

  Incorrect current limit
  Friction - bad bearing & carriage alignment
  Belt tension
  Speed & acceleration parameters

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