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Messages - bob2299

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General Discussion / Re: laser venting
« on: September 12, 2019, 11:36:11 AM »

I am in an apartment.  I have my unit (2.5 watt) set up on a table ajacent to my window.  When in use, I use a medium size home fan with about a 10" blade set in front of my window which is open about 10" and is blowing air from the room to outside.  Air moves from Laser unit to fan to outside a distance of about 30" from laser to outside.

No smell of burning wood in the room so I believe it is doing the job.

Engraving / Re: Machine stopped mid job????/
« on: August 18, 2019, 08:44:43 AM »
Thanks for the tips.  Iwas able to save the job by re-registering the file, rerunning the file and turning the laser beam off until it reached the stop point, then tuning the beam on for rest of job.  I will post a picture once I get the platter finish applied.

Like your suggestion for future jobs, particularly breaking big job into several smaller ones.

I have 3d printed lifts to raise the laser engraver.  Diferent height lifts would give me better laser focus whereas the way I did it as single burn the focus range was at its limit.

In any event need more work on my technique.


Photo attached - platter is 9.5 inch diameter and is Box elder (Manitoba maple) with Tung oil finish.  Lousy photo, but you get the idea.

Engraving / Re: Machine stopped mid job????/
« on: August 16, 2019, 06:52:18 AM »
Thanks Zak, but no error messages on computer screen or on T2 screen, everything just stopped.

I will try to recover by re-running the job but with laser beam off.  Once I get to the point where the job stopped I will reactivate laser beam and continue the burn. 

Engraving / Machine stopped mid job????/
« on: August 15, 2019, 05:07:07 PM »
I am in middle of 5 hour burn on a turned 9 inch maple platter and my machine suddenly stopped.  My computer is dedicated to laser use only, so should not be any interference.

Any suggestions as to what might have happened and is there is a way to restart and finish the job? 


Projects / Re: Mayan calendar on slate
« on: August 02, 2019, 05:13:06 PM »
Thanks Zak, will use your advice particularly for my next big job.

For Ggallant571, c.lfrost,  and Carolynsdad, I have been using MinWax spray poly after the laser run, I will change my habit and apply it before laser run and see the difference.

Thanks to all.


Projects / Mayan calendar on slate
« on: August 02, 2019, 01:01:28 PM »
Always wanted to try this on a larger piece of slate.  Went to local tile shop and they ordered me several pieces of "black" slate 12"x12"x1/4" at a cost of $4.50 cdn. per piece

Settings used with T2 were; resolution 0.10, speed 1000, power 100%, B&W .  Slate was washed first to remove debris.  There is a small flaw about 1:00 which didn't cut very well.  Completed job was sprayed with MinWax spray poly to bring up contrast once completed.  This slate was not as black as I have seen with slate coastes from Michaels which likely accounts for the level of contrast.

Looks pretty good, but would have liked it larger than the 9x9".  I ran into limits on lines that T2 would handle when using a larger size like 10"x10" or 11"x11".  Gcode was 600,00 lines and took 400 minutes to print.


I have a Ender 3 3D printer using Marlin with an added BLTouch auto leveler.

I thought I could handle a firmware upgrade, but apparently not.

For the Ender 3 to upgrade the firmware you need to install a bootloader using an Arduino UNO.  Then you do a basic firmware upgrade and then I added a BLTouch Auto Leveler.

I did the bootloader, but no way of knowing if it was successful.  Then went to the Marlin upgrade and installation of the BLTouch.

Unsuccessful!  Error message is "avrdude: ser_open(): can't set com-state for "\\.\COM4"
An error occurred while uploading the sketch"

When setting up configuration.h file it indicates under tools that I am using COM4.
I have no idea what this error means nor how to resolve it.  I know we have some sharp 3D gurus in this forum.  Anyone have any suggestion on my problem or a remedy?



Eventually found a solution.  I kept getting printer to connect to Com 4.  so I disconnected printer, but left cable connected to PC com4.  Used another cable and different USB port and connected printer.  This time it connected to com port 5 and uploaded the firmware without  an error.

All is now working as it should with bootloader and current version of Marlin.  I did not connect the BLTouch, I will keep that upgrade for another day.

Not really sure what the explanation is, but if someone can explain I would appreciate it.


Engraving / Engraving brass?
« on: December 27, 2018, 11:27:45 AM »

Can our 2.5w machines engrave brass?

T2 Engraving / Re: Using sketch to engrave and cut a medalian
« on: November 14, 2018, 12:39:04 PM »
Is there a way to prevent this?  It did not occur every time.  I have adjusted the current in the stepper drivers slightly (clockwise adjustment of adjustment screw).


T2 Engraving / Re: Using sketch to engrave and cut a medalian
« on: November 12, 2018, 11:51:00 AM »
Sorry for the delay in getting back.

I have managed to get my project completed, but not as I would have preferred.  I have attached two final files, scott-outline-large.svg and scott-text-large.svg.

The method I used was to create one medallion was in Inkscape using circles and camBam stick fonts.  Positioned everything until I was happy.  Checked measurements for accuracy, printed on paper and checked accuracy, OK.  Saved as a dxf file and printed with T2 on cardstock, accuracy OK.

Then I went back to inkscape and duplicated the coins 15 times to fit my basswood.  I then created Scott-outline-large by selecting and deleting all but the outine.  Result 15 outines.  Then I did the same by deleting the outer circles of the coins.  Result 15 "text" drawings.  All drawings are vectors.  Created DXF file for "text" and "outline".

Using T2 I burned a reference mark at 0:0.  Using T2 with the Scott-text-large.dxf I printed the "text" drawings.  Homed the laser and it relocated at 0:0.  Loaded scott-outline-large.dxf and verified home was at 0:0.  Burned pass 1.  Rehomed for each of 6 passes.  Rehoming of two passes did not rehome correctly but were about 1mm off in the "Y" directioon.  These were manually rehomed and the burns completed. 

I was able to complete the project, the medallions are round, well spaced and will fit in a 1" Forstner bit hole 1.5mm deep. 

I still have a problem in that my laser did not rehome  to the 0:0 point every time.  I did not use the sketch technique of multi passes becuase of my rehoming problem.


T2 Engraving / Re: Using sketch to engrave and cut a medalian
« on: November 01, 2018, 08:13:54 AM »
Thanks, attached are the text file and the outline file in SVG format.  The text file gets one pass, the outline 5 passes. 


T2 Engraving / Re: Using sketch to engrave and cut a medalian
« on: October 31, 2018, 01:50:28 PM »
I am having difficulty in my medallion project, but am getting closer to success.

The medallion is created with Inkscape.  I then take the completed medallion and create two new files, one an outline and  one the text.

I then burn the text file, 1 pass at 50% power.  I home the laser.  I then burn the outline (6 passes to cut through 1.5mm basswood).  Placement or alignment is important or I end up with a poor looking medallion, see photo  (home laser pulses do not show up in photo).  The medallion is 19mm diameter (3/4").

I have been trying to find what is causing variation in my output and have finally traced it to my laser not homing to the exact same place each time.  It is about 1mm out in the "Y" direction, "X" alignment is perfect. 

Any suggestions as to what adjustments will correct this?


Corrected a couple of words

T2 Engraving / Re: Width of burn line
« on: October 30, 2018, 03:03:09 PM »
Thank you both. 

I am burning 1.5mm basswood.  Have done some experimenting with Forstner bit holes and inserting the
'coins".  I find that it needs a diameter of 24.6mm to fit nicely in the hole made by a 1" (25.4mm) Forstener. 

My burn requires 5 passes at 600 speed and full power.  The part of the job that is text uses same speed, 1 pass and 150 power setting.


T2 Engraving / Width of burn line
« on: October 30, 2018, 07:08:51 AM »
Does anyone know the typical width (kerf) of the burn line of the laser?

T2 Engraving / Re: Using sketch to engrave and cut a medalian
« on: October 25, 2018, 01:18:05 PM »
Thanks, found 2 you tube videos by him and watched them.  Good info.


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